Merge "Preparation task for Settings Fragment Migration"

17 files changed, 2372 insertions, 5 deletions

diff --git a/packages/SettingsLib/src/com/android/settingslib/CustomDialogPreferenceCompat.java b/packages/SettingsLib/src/com/android/settingslib/CustomDialogPreferenceCompat.java
new file mode 100644
index 000000000000..6ac9d4e21f40
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/CustomDialogPreferenceCompat.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.settingslib;
+
+import android.app.Dialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.util.AttributeSet;
+import android.view.View;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.preference.DialogPreference;
+import androidx.preference.PreferenceDialogFragmentCompat;
+
+public class CustomDialogPreferenceCompat extends DialogPreference {
+
+    private CustomPreferenceDialogFragment mFragment;
+    private DialogInterface.OnShowListener mOnShowListener;
+
+    public CustomDialogPreferenceCompat(Context context, AttributeSet attrs, int defStyleAttr,
+            int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    public CustomDialogPreferenceCompat(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public CustomDialogPreferenceCompat(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public CustomDialogPreferenceCompat(Context context) {
+        super(context);
+    }
+
+    public boolean isDialogOpen() {
+        return getDialog() != null && getDialog().isShowing();
+    }
+
+    public Dialog getDialog() {
+        return mFragment != null ? mFragment.getDialog() : null;
+    }
+
+    public void setOnShowListener(DialogInterface.OnShowListener listner) {
+        mOnShowListener = listner;
+    }
+
+    protected void onPrepareDialogBuilder(AlertDialog.Builder builder,
+            DialogInterface.OnClickListener listener) {
+    }
+
+    protected void onDialogClosed(boolean positiveResult) {
+    }
+
+    protected void onClick(DialogInterface dialog, int which) {
+    }
+
+    protected void onBindDialogView(View view) {
+    }
+
+    private void setFragment(CustomPreferenceDialogFragment fragment) {
+        mFragment = fragment;
+    }
+
+    private DialogInterface.OnShowListener getOnShowListener() {
+        return mOnShowListener;
+    }
+
+    public static class CustomPreferenceDialogFragment extends PreferenceDialogFragmentCompat {
+
+        public static CustomPreferenceDialogFragment newInstance(String key) {
+            final CustomPreferenceDialogFragment fragment = new CustomPreferenceDialogFragment();
+            final Bundle b = new Bundle(1);
+            b.putString(ARG_KEY, key);
+            fragment.setArguments(b);
+            return fragment;
+        }
+
+        private CustomDialogPreferenceCompat getCustomizablePreference() {
+            return (CustomDialogPreferenceCompat) getPreference();
+        }
+
+        @Override
+        protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
+            super.onPrepareDialogBuilder(builder);
+            getCustomizablePreference().setFragment(this);
+            getCustomizablePreference().onPrepareDialogBuilder(builder, this);
+        }
+
+        @Override
+        public void onDialogClosed(boolean positiveResult) {
+            getCustomizablePreference().onDialogClosed(positiveResult);
+        }
+
+        @Override
+        protected void onBindDialogView(View view) {
+            super.onBindDialogView(view);
+            getCustomizablePreference().onBindDialogView(view);
+        }
+
+        @Override
+        public Dialog onCreateDialog(Bundle savedInstanceState) {
+            final Dialog dialog = super.onCreateDialog(savedInstanceState);
+            dialog.setOnShowListener(getCustomizablePreference().getOnShowListener());
+            return dialog;
+        }
+
+        @Override
+        public void onClick(DialogInterface dialog, int which) {
+            super.onClick(dialog, which);
+            getCustomizablePreference().onClick(dialog, which);
+        }
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/CustomEditTextPreferenceCompat.java b/packages/SettingsLib/src/com/android/settingslib/CustomEditTextPreferenceCompat.java
new file mode 100644
index 000000000000..6ddc89af03ad
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/CustomEditTextPreferenceCompat.java
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.settingslib;
+
+import static android.text.InputType.TYPE_CLASS_TEXT;
+import static android.text.InputType.TYPE_TEXT_FLAG_CAP_SENTENCES;
+
+import android.app.Dialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.EditText;
+
+import androidx.annotation.CallSuper;
+import androidx.appcompat.app.AlertDialog;
+import androidx.preference.EditTextPreference;
+import androidx.preference.EditTextPreferenceDialogFragmentCompat;
+
+public class CustomEditTextPreferenceCompat extends EditTextPreference {
+
+    private CustomPreferenceDialogFragment mFragment;
+
+    public CustomEditTextPreferenceCompat(Context context, AttributeSet attrs, int defStyleAttr,
+            int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    public CustomEditTextPreferenceCompat(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public CustomEditTextPreferenceCompat(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public CustomEditTextPreferenceCompat(Context context) {
+        super(context);
+    }
+
+    public EditText getEditText() {
+        if (mFragment != null) {
+            final Dialog dialog = mFragment.getDialog();
+            if (dialog != null) {
+                return (EditText) dialog.findViewById(android.R.id.edit);
+            }
+        }
+        return null;
+    }
+
+    public boolean isDialogOpen() {
+        return getDialog() != null && getDialog().isShowing();
+    }
+
+    public Dialog getDialog() {
+        return mFragment != null ? mFragment.getDialog() : null;
+    }
+
+    protected void onPrepareDialogBuilder(AlertDialog.Builder builder,
+            DialogInterface.OnClickListener listener) {
+    }
+
+    protected void onDialogClosed(boolean positiveResult) {
+    }
+
+    protected void onClick(DialogInterface dialog, int which) {
+    }
+
+    @CallSuper
+    protected void onBindDialogView(View view) {
+        final EditText editText = view.findViewById(android.R.id.edit);
+        if (editText != null) {
+            editText.setInputType(TYPE_CLASS_TEXT | TYPE_TEXT_FLAG_CAP_SENTENCES);
+            editText.requestFocus();
+        }
+    }
+
+    private void setFragment(CustomPreferenceDialogFragment fragment) {
+        mFragment = fragment;
+    }
+
+    public static class CustomPreferenceDialogFragment extends
+            EditTextPreferenceDialogFragmentCompat {
+
+        public static CustomPreferenceDialogFragment newInstance(String key) {
+            final CustomPreferenceDialogFragment fragment = new CustomPreferenceDialogFragment();
+            final Bundle b = new Bundle(1);
+            b.putString(ARG_KEY, key);
+            fragment.setArguments(b);
+            return fragment;
+        }
+
+        private CustomEditTextPreferenceCompat getCustomizablePreference() {
+            return (CustomEditTextPreferenceCompat) getPreference();
+        }
+
+        @Override
+        protected void onBindDialogView(View view) {
+            super.onBindDialogView(view);
+            getCustomizablePreference().onBindDialogView(view);
+        }
+
+        @Override
+        protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
+            super.onPrepareDialogBuilder(builder);
+            getCustomizablePreference().setFragment(this);
+            getCustomizablePreference().onPrepareDialogBuilder(builder, this);
+        }
+
+        @Override
+        public void onDialogClosed(boolean positiveResult) {
+            super.onDialogClosed(positiveResult);
+            getCustomizablePreference().onDialogClosed(positiveResult);
+        }
+
+        @Override
+        public void onClick(DialogInterface dialog, int which) {
+            super.onClick(dialog, which);
+            getCustomizablePreference().onClick(dialog, which);
+        }
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/inputmethod/InputMethodAndSubtypeEnablerManagerCompat.java b/packages/SettingsLib/src/com/android/settingslib/inputmethod/InputMethodAndSubtypeEnablerManagerCompat.java
new file mode 100644
index 000000000000..ad1368c7731d
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/inputmethod/InputMethodAndSubtypeEnablerManagerCompat.java
@@ -0,0 +1,265 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.settingslib.inputmethod;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.content.res.Configuration;
+import android.text.TextUtils;
+import android.view.inputmethod.InputMethodInfo;
+import android.view.inputmethod.InputMethodManager;
+import android.view.inputmethod.InputMethodSubtype;
+
+import com.android.settingslib.R;
+
+import java.text.Collator;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.TwoStatePreference;
+
+public class InputMethodAndSubtypeEnablerManagerCompat implements
+        Preference.OnPreferenceChangeListener {
+
+    private final PreferenceFragmentCompat mFragment;
+
+    private boolean mHaveHardKeyboard;
+    private final HashMap<String, List<Preference>> mInputMethodAndSubtypePrefsMap =
+            new HashMap<>();
+    private final HashMap<String, TwoStatePreference> mAutoSelectionPrefsMap = new HashMap<>();
+    private InputMethodManager mImm;
+    // TODO: Change mInputMethodInfoList to Map
+    private List<InputMethodInfo> mInputMethodInfoList;
+    private final Collator mCollator = Collator.getInstance();
+
+    public InputMethodAndSubtypeEnablerManagerCompat(PreferenceFragmentCompat fragment) {
+        mFragment = fragment;
+        mImm = fragment.getContext().getSystemService(InputMethodManager.class);
+
+        mInputMethodInfoList = mImm.getInputMethodList();
+    }
+
+    public void init(PreferenceFragmentCompat fragment, String targetImi, PreferenceScreen root) {
+        final Configuration config = fragment.getResources().getConfiguration();
+        mHaveHardKeyboard = (config.keyboard == Configuration.KEYBOARD_QWERTY);
+
+        for (final InputMethodInfo imi : mInputMethodInfoList) {
+            // Add subtype preferences of this IME when it is specified or no IME is specified.
+            if (imi.getId().equals(targetImi) || TextUtils.isEmpty(targetImi)) {
+                addInputMethodSubtypePreferences(fragment, imi, root);
+            }
+        }
+    }
+
+    public void refresh(Context context, PreferenceFragmentCompat fragment) {
+        // Refresh internal states in mInputMethodSettingValues to keep the latest
+        // "InputMethodInfo"s and "InputMethodSubtype"s
+        InputMethodSettingValuesWrapper
+                .getInstance(context).refreshAllInputMethodAndSubtypes();
+        InputMethodAndSubtypeUtilCompat.loadInputMethodSubtypeList(fragment,
+                context.getContentResolver(), mInputMethodInfoList, mInputMethodAndSubtypePrefsMap);
+        updateAutoSelectionPreferences();
+    }
+
+    public void save(Context context, PreferenceFragmentCompat fragment) {
+        InputMethodAndSubtypeUtilCompat.saveInputMethodSubtypeList(fragment,
+                context.getContentResolver(), mInputMethodInfoList, mHaveHardKeyboard);
+    }
+
+    @Override
+    public boolean onPreferenceChange(final Preference pref, final Object newValue) {
+        if (!(newValue instanceof Boolean)) {
+            return true; // Invoke default behavior.
+        }
+        final boolean isChecking = (Boolean) newValue;
+        for (final String imiId : mAutoSelectionPrefsMap.keySet()) {
+            // An auto select subtype preference is changing.
+            if (mAutoSelectionPrefsMap.get(imiId) == pref) {
+                final TwoStatePreference autoSelectionPref = (TwoStatePreference) pref;
+                autoSelectionPref.setChecked(isChecking);
+                // Enable or disable subtypes depending on the auto selection preference.
+                setAutoSelectionSubtypesEnabled(imiId, autoSelectionPref.isChecked());
+                return false;
+            }
+        }
+        // A subtype preference is changing.
+        if (pref instanceof InputMethodSubtypePreference) {
+            final InputMethodSubtypePreference subtypePref = (InputMethodSubtypePreference) pref;
+            subtypePref.setChecked(isChecking);
+            if (!subtypePref.isChecked()) {
+                // It takes care of the case where no subtypes are explicitly enabled then the auto
+                // selection preference is going to be checked.
+                updateAutoSelectionPreferences();
+            }
+            return false;
+        }
+        return true; // Invoke default behavior.
+    }
+
+    private void addInputMethodSubtypePreferences(PreferenceFragmentCompat fragment,
+            InputMethodInfo imi, final PreferenceScreen root) {
+        Context prefContext = fragment.getPreferenceManager().getContext();
+
+        final int subtypeCount = imi.getSubtypeCount();
+        if (subtypeCount <= 1) {
+            return;
+        }
+        final String imiId = imi.getId();
+        final PreferenceCategory keyboardSettingsCategory =
+                new PreferenceCategory(prefContext);
+        root.addPreference(keyboardSettingsCategory);
+        final PackageManager pm = prefContext.getPackageManager();
+        final CharSequence label = imi.loadLabel(pm);
+
+        keyboardSettingsCategory.setTitle(label);
+        keyboardSettingsCategory.setKey(imiId);
+        // TODO: Use toggle Preference if images are ready.
+        final TwoStatePreference autoSelectionPref =
+                new SwitchWithNoTextPreference(prefContext);
+        mAutoSelectionPrefsMap.put(imiId, autoSelectionPref);
+        keyboardSettingsCategory.addPreference(autoSelectionPref);
+        autoSelectionPref.setOnPreferenceChangeListener(this);
+
+        final PreferenceCategory activeInputMethodsCategory =
+                new PreferenceCategory(prefContext);
+        activeInputMethodsCategory.setTitle(R.string.active_input_method_subtypes);
+        root.addPreference(activeInputMethodsCategory);
+
+        CharSequence autoSubtypeLabel = null;
+        final ArrayList<Preference> subtypePreferences = new ArrayList<>();
+        for (int index = 0; index < subtypeCount; ++index) {
+            final InputMethodSubtype subtype = imi.getSubtypeAt(index);
+            if (subtype.overridesImplicitlyEnabledSubtype()) {
+                if (autoSubtypeLabel == null) {
+                    autoSubtypeLabel = InputMethodAndSubtypeUtil.getSubtypeLocaleNameAsSentence(
+                            subtype, prefContext, imi);
+                }
+            } else {
+                final Preference subtypePref = new InputMethodSubtypePreference(
+                        prefContext, subtype, imi);
+                subtypePreferences.add(subtypePref);
+            }
+        }
+        subtypePreferences.sort((lhs, rhs) -> {
+            if (lhs instanceof InputMethodSubtypePreference) {
+                return ((InputMethodSubtypePreference) lhs).compareTo(rhs, mCollator);
+            }
+            return lhs.compareTo(rhs);
+        });
+        for (final Preference pref : subtypePreferences) {
+            activeInputMethodsCategory.addPreference(pref);
+            pref.setOnPreferenceChangeListener(this);
+            InputMethodAndSubtypeUtil.removeUnnecessaryNonPersistentPreference(pref);
+        }
+        mInputMethodAndSubtypePrefsMap.put(imiId, subtypePreferences);
+        if (TextUtils.isEmpty(autoSubtypeLabel)) {
+            autoSelectionPref.setTitle(
+                    R.string.use_system_language_to_select_input_method_subtypes);
+        } else {
+            autoSelectionPref.setTitle(autoSubtypeLabel);
+        }
+    }
+
+    private boolean isNoSubtypesExplicitlySelected(final String imiId) {
+        final List<Preference> subtypePrefs = mInputMethodAndSubtypePrefsMap.get(imiId);
+        for (final Preference pref : subtypePrefs) {
+            if (pref instanceof TwoStatePreference && ((TwoStatePreference) pref).isChecked()) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private void setAutoSelectionSubtypesEnabled(final String imiId,
+            final boolean autoSelectionEnabled) {
+        final TwoStatePreference autoSelectionPref = mAutoSelectionPrefsMap.get(imiId);
+        if (autoSelectionPref == null) {
+            return;
+        }
+        autoSelectionPref.setChecked(autoSelectionEnabled);
+        final List<Preference> subtypePrefs = mInputMethodAndSubtypePrefsMap.get(imiId);
+        for (final Preference pref : subtypePrefs) {
+            if (pref instanceof TwoStatePreference) {
+                // When autoSelectionEnabled is true, all subtype prefs need to be disabled with
+                // implicitly checked subtypes. In case of false, all subtype prefs need to be
+                // enabled.
+                pref.setEnabled(!autoSelectionEnabled);
+                if (autoSelectionEnabled) {
+                    ((TwoStatePreference) pref).setChecked(false);
+                }
+            }
+        }
+        if (autoSelectionEnabled) {
+            InputMethodAndSubtypeUtilCompat.saveInputMethodSubtypeList(
+                    mFragment, mFragment.getContext().getContentResolver(),
+                    mInputMethodInfoList, mHaveHardKeyboard);
+            updateImplicitlyEnabledSubtypes(imiId);
+        }
+    }
+
+    private void updateImplicitlyEnabledSubtypes(final String targetImiId) {
+        // When targetImiId is null, apply to all subtypes of all IMEs
+        for (final InputMethodInfo imi : mInputMethodInfoList) {
+            final String imiId = imi.getId();
+            final TwoStatePreference autoSelectionPref = mAutoSelectionPrefsMap.get(imiId);
+            // No need to update implicitly enabled subtypes when the user has unchecked the
+            // "subtype auto selection".
+            if (autoSelectionPref == null || !autoSelectionPref.isChecked()) {
+                continue;
+            }
+            if (imiId.equals(targetImiId) || targetImiId == null) {
+                updateImplicitlyEnabledSubtypesOf(imi);
+            }
+        }
+    }
+
+    private void updateImplicitlyEnabledSubtypesOf(final InputMethodInfo imi) {
+        final String imiId = imi.getId();
+        final List<Preference> subtypePrefs = mInputMethodAndSubtypePrefsMap.get(imiId);
+        final List<InputMethodSubtype> implicitlyEnabledSubtypes =
+                mImm.getEnabledInputMethodSubtypeList(imi, true);
+        if (subtypePrefs == null || implicitlyEnabledSubtypes == null) {
+            return;
+        }
+        for (final Preference pref : subtypePrefs) {
+            if (!(pref instanceof TwoStatePreference)) {
+                continue;
+            }
+            final TwoStatePreference subtypePref = (TwoStatePreference) pref;
+            subtypePref.setChecked(false);
+            for (final InputMethodSubtype subtype : implicitlyEnabledSubtypes) {
+                final String implicitlyEnabledSubtypePrefKey = imiId + subtype.hashCode();
+                if (subtypePref.getKey().equals(implicitlyEnabledSubtypePrefKey)) {
+                    subtypePref.setChecked(true);
+                    break;
+                }
+            }
+        }
+    }
+
+    private void updateAutoSelectionPreferences() {
+        for (final String imiId : mInputMethodAndSubtypePrefsMap.keySet()) {
+            setAutoSelectionSubtypesEnabled(imiId, isNoSubtypesExplicitlySelected(imiId));
+        }
+        updateImplicitlyEnabledSubtypes(null /* targetImiId */  /* check */);
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/inputmethod/InputMethodAndSubtypeUtilCompat.java b/packages/SettingsLib/src/com/android/settingslib/inputmethod/InputMethodAndSubtypeUtilCompat.java
new file mode 100644
index 000000000000..9ad2adbcc432
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/inputmethod/InputMethodAndSubtypeUtilCompat.java
@@ -0,0 +1,436 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.settingslib.inputmethod;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.icu.text.ListFormatter;
+import android.provider.Settings;
+import android.provider.Settings.SettingNotFoundException;
+import android.text.TextUtils;
+import android.util.Log;
+import android.view.inputmethod.InputMethodInfo;
+import android.view.inputmethod.InputMethodSubtype;
+
+import com.android.internal.app.LocaleHelper;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.TwoStatePreference;
+
+// TODO: Consolidate this with {@link InputMethodSettingValuesWrapper}.
+public class InputMethodAndSubtypeUtilCompat {
+
+    private static final boolean DEBUG = false;
+    private static final String TAG = "InputMethdAndSubtypeUtlCompat";
+
+    private static final String SUBTYPE_MODE_KEYBOARD = "keyboard";
+    private static final char INPUT_METHOD_SEPARATER = ':';
+    private static final char INPUT_METHOD_SUBTYPE_SEPARATER = ';';
+    private static final int NOT_A_SUBTYPE_ID = -1;
+
+    private static final TextUtils.SimpleStringSplitter sStringInputMethodSplitter
+            = new TextUtils.SimpleStringSplitter(INPUT_METHOD_SEPARATER);
+
+    private static final TextUtils.SimpleStringSplitter sStringInputMethodSubtypeSplitter
+            = new TextUtils.SimpleStringSplitter(INPUT_METHOD_SUBTYPE_SEPARATER);
+
+    // InputMethods and subtypes are saved in the settings as follows:
+    // ime0;subtype0;subtype1:ime1;subtype0:ime2:ime3;subtype0;subtype1
+    public static String buildInputMethodsAndSubtypesString(
+            final HashMap<String, HashSet<String>> imeToSubtypesMap) {
+        final StringBuilder builder = new StringBuilder();
+        for (final String imi : imeToSubtypesMap.keySet()) {
+            if (builder.length() > 0) {
+                builder.append(INPUT_METHOD_SEPARATER);
+            }
+            final HashSet<String> subtypeIdSet = imeToSubtypesMap.get(imi);
+            builder.append(imi);
+            for (final String subtypeId : subtypeIdSet) {
+                builder.append(INPUT_METHOD_SUBTYPE_SEPARATER).append(subtypeId);
+            }
+        }
+        return builder.toString();
+    }
+
+    private static String buildInputMethodsString(final HashSet<String> imiList) {
+        final StringBuilder builder = new StringBuilder();
+        for (final String imi : imiList) {
+            if (builder.length() > 0) {
+                builder.append(INPUT_METHOD_SEPARATER);
+            }
+            builder.append(imi);
+        }
+        return builder.toString();
+    }
+
+    private static int getInputMethodSubtypeSelected(ContentResolver resolver) {
+        try {
+            return Settings.Secure.getInt(resolver,
+                    Settings.Secure.SELECTED_INPUT_METHOD_SUBTYPE);
+        } catch (SettingNotFoundException e) {
+            return NOT_A_SUBTYPE_ID;
+        }
+    }
+
+    private static boolean isInputMethodSubtypeSelected(ContentResolver resolver) {
+        return getInputMethodSubtypeSelected(resolver) != NOT_A_SUBTYPE_ID;
+    }
+
+    private static void putSelectedInputMethodSubtype(ContentResolver resolver, int hashCode) {
+        Settings.Secure.putInt(resolver, Settings.Secure.SELECTED_INPUT_METHOD_SUBTYPE, hashCode);
+    }
+
+    // Needs to modify InputMethodManageService if you want to change the format of saved string.
+    static HashMap<String, HashSet<String>> getEnabledInputMethodsAndSubtypeList(
+            ContentResolver resolver) {
+        final String enabledInputMethodsStr = Settings.Secure.getString(
+                resolver, Settings.Secure.ENABLED_INPUT_METHODS);
+        if (DEBUG) {
+            Log.d(TAG, "--- Load enabled input methods: " + enabledInputMethodsStr);
+        }
+        return parseInputMethodsAndSubtypesString(enabledInputMethodsStr);
+    }
+
+    public static HashMap<String, HashSet<String>> parseInputMethodsAndSubtypesString(
+            final String inputMethodsAndSubtypesString) {
+        final HashMap<String, HashSet<String>> subtypesMap = new HashMap<>();
+        if (TextUtils.isEmpty(inputMethodsAndSubtypesString)) {
+            return subtypesMap;
+        }
+        sStringInputMethodSplitter.setString(inputMethodsAndSubtypesString);
+        while (sStringInputMethodSplitter.hasNext()) {
+            final String nextImsStr = sStringInputMethodSplitter.next();
+            sStringInputMethodSubtypeSplitter.setString(nextImsStr);
+            if (sStringInputMethodSubtypeSplitter.hasNext()) {
+                final HashSet<String> subtypeIdSet = new HashSet<>();
+                // The first element is {@link InputMethodInfoId}.
+                final String imiId = sStringInputMethodSubtypeSplitter.next();
+                while (sStringInputMethodSubtypeSplitter.hasNext()) {
+                    subtypeIdSet.add(sStringInputMethodSubtypeSplitter.next());
+                }
+                subtypesMap.put(imiId, subtypeIdSet);
+            }
+        }
+        return subtypesMap;
+    }
+
+    private static HashSet<String> getDisabledSystemIMEs(ContentResolver resolver) {
+        HashSet<String> set = new HashSet<>();
+        String disabledIMEsStr = Settings.Secure.getString(
+                resolver, Settings.Secure.DISABLED_SYSTEM_INPUT_METHODS);
+        if (TextUtils.isEmpty(disabledIMEsStr)) {
+            return set;
+        }
+        sStringInputMethodSplitter.setString(disabledIMEsStr);
+        while(sStringInputMethodSplitter.hasNext()) {
+            set.add(sStringInputMethodSplitter.next());
+        }
+        return set;
+    }
+
+    public static void saveInputMethodSubtypeList(PreferenceFragmentCompat context,
+            ContentResolver resolver, List<InputMethodInfo> inputMethodInfos,
+            boolean hasHardKeyboard) {
+        String currentInputMethodId = Settings.Secure.getString(resolver,
+                Settings.Secure.DEFAULT_INPUT_METHOD);
+        final int selectedInputMethodSubtype = getInputMethodSubtypeSelected(resolver);
+        final HashMap<String, HashSet<String>> enabledIMEsAndSubtypesMap =
+                getEnabledInputMethodsAndSubtypeList(resolver);
+        final HashSet<String> disabledSystemIMEs = getDisabledSystemIMEs(resolver);
+
+        boolean needsToResetSelectedSubtype = false;
+        for (final InputMethodInfo imi : inputMethodInfos) {
+            final String imiId = imi.getId();
+            final Preference pref = context.findPreference(imiId);
+            if (pref == null) {
+                continue;
+            }
+            // In the choose input method screen or in the subtype enabler screen,
+            // <code>pref</code> is an instance of TwoStatePreference.
+            final boolean isImeChecked = (pref instanceof TwoStatePreference) ?
+                    ((TwoStatePreference) pref).isChecked()
+                    : enabledIMEsAndSubtypesMap.containsKey(imiId);
+            final boolean isCurrentInputMethod = imiId.equals(currentInputMethodId);
+            final boolean systemIme = imi.isSystem();
+            if ((!hasHardKeyboard && InputMethodSettingValuesWrapper.getInstance(
+                    context.getActivity()).isAlwaysCheckedIme(imi))
+                    || isImeChecked) {
+                if (!enabledIMEsAndSubtypesMap.containsKey(imiId)) {
+                    // imiId has just been enabled
+                    enabledIMEsAndSubtypesMap.put(imiId, new HashSet<>());
+                }
+                final HashSet<String> subtypesSet = enabledIMEsAndSubtypesMap.get(imiId);
+
+                boolean subtypePrefFound = false;
+                final int subtypeCount = imi.getSubtypeCount();
+                for (int i = 0; i < subtypeCount; ++i) {
+                    final InputMethodSubtype subtype = imi.getSubtypeAt(i);
+                    final String subtypeHashCodeStr = String.valueOf(subtype.hashCode());
+                    final TwoStatePreference subtypePref = (TwoStatePreference) context
+                            .findPreference(imiId + subtypeHashCodeStr);
+                    // In the Configure input method screen which does not have subtype preferences.
+                    if (subtypePref == null) {
+                        continue;
+                    }
+                    if (!subtypePrefFound) {
+                        // Once subtype preference is found, subtypeSet needs to be cleared.
+                        // Because of system change, hashCode value could have been changed.
+                        subtypesSet.clear();
+                        // If selected subtype preference is disabled, needs to reset.
+                        needsToResetSelectedSubtype = true;
+                        subtypePrefFound = true;
+                    }
+                    // Checking <code>subtypePref.isEnabled()</code> is insufficient to determine
+                    // whether the user manually enabled this subtype or not.  Implicitly-enabled
+                    // subtypes are also checked just as an indicator to users.  We also need to
+                    // check <code>subtypePref.isEnabled()</code> so that only manually enabled
+                    // subtypes can be saved here.
+                    if (subtypePref.isEnabled() && subtypePref.isChecked()) {
+                        subtypesSet.add(subtypeHashCodeStr);
+                        if (isCurrentInputMethod) {
+                            if (selectedInputMethodSubtype == subtype.hashCode()) {
+                                // Selected subtype is still enabled, there is no need to reset
+                                // selected subtype.
+                                needsToResetSelectedSubtype = false;
+                            }
+                        }
+                    } else {
+                        subtypesSet.remove(subtypeHashCodeStr);
+                    }
+                }
+            } else {
+                enabledIMEsAndSubtypesMap.remove(imiId);
+                if (isCurrentInputMethod) {
+                    // We are processing the current input method, but found that it's not enabled.
+                    // This means that the current input method has been uninstalled.
+                    // If currentInputMethod is already uninstalled, InputMethodManagerService will
+                    // find the applicable IME from the history and the system locale.
+                    if (DEBUG) {
+                        Log.d(TAG, "Current IME was uninstalled or disabled.");
+                    }
+                    currentInputMethodId = null;
+                }
+            }
+            // If it's a disabled system ime, add it to the disabled list so that it
+            // doesn't get enabled automatically on any changes to the package list
+            if (systemIme && hasHardKeyboard) {
+                if (disabledSystemIMEs.contains(imiId)) {
+                    if (isImeChecked) {
+                        disabledSystemIMEs.remove(imiId);
+                    }
+                } else {
+                    if (!isImeChecked) {
+                        disabledSystemIMEs.add(imiId);
+                    }
+                }
+            }
+        }
+
+        final String enabledIMEsAndSubtypesString = buildInputMethodsAndSubtypesString(
+                enabledIMEsAndSubtypesMap);
+        final String disabledSystemIMEsString = buildInputMethodsString(disabledSystemIMEs);
+        if (DEBUG) {
+            Log.d(TAG, "--- Save enabled inputmethod settings. :" + enabledIMEsAndSubtypesString);
+            Log.d(TAG, "--- Save disabled system inputmethod settings. :"
+                    + disabledSystemIMEsString);
+            Log.d(TAG, "--- Save default inputmethod settings. :" + currentInputMethodId);
+            Log.d(TAG, "--- Needs to reset the selected subtype :" + needsToResetSelectedSubtype);
+            Log.d(TAG, "--- Subtype is selected :" + isInputMethodSubtypeSelected(resolver));
+        }
+
+        // Redefines SelectedSubtype when all subtypes are unchecked or there is no subtype
+        // selected. And if the selected subtype of the current input method was disabled,
+        // We should reset the selected input method's subtype.
+        if (needsToResetSelectedSubtype || !isInputMethodSubtypeSelected(resolver)) {
+            if (DEBUG) {
+                Log.d(TAG, "--- Reset inputmethod subtype because it's not defined.");
+            }
+            putSelectedInputMethodSubtype(resolver, NOT_A_SUBTYPE_ID);
+        }
+
+        Settings.Secure.putString(resolver,
+                Settings.Secure.ENABLED_INPUT_METHODS, enabledIMEsAndSubtypesString);
+        if (disabledSystemIMEsString.length() > 0) {
+            Settings.Secure.putString(resolver, Settings.Secure.DISABLED_SYSTEM_INPUT_METHODS,
+                    disabledSystemIMEsString);
+        }
+        // If the current input method is unset, InputMethodManagerService will find the applicable
+        // IME from the history and the system locale.
+        Settings.Secure.putString(resolver, Settings.Secure.DEFAULT_INPUT_METHOD,
+                currentInputMethodId != null ? currentInputMethodId : "");
+    }
+
+    public static void loadInputMethodSubtypeList(final PreferenceFragmentCompat context,
+            final ContentResolver resolver, final List<InputMethodInfo> inputMethodInfos,
+            final Map<String, List<Preference>> inputMethodPrefsMap) {
+        final HashMap<String, HashSet<String>> enabledSubtypes =
+                getEnabledInputMethodsAndSubtypeList(resolver);
+
+        for (final InputMethodInfo imi : inputMethodInfos) {
+            final String imiId = imi.getId();
+            final Preference pref = context.findPreference(imiId);
+            if (pref instanceof TwoStatePreference) {
+                final TwoStatePreference subtypePref = (TwoStatePreference) pref;
+                final boolean isEnabled = enabledSubtypes.containsKey(imiId);
+                subtypePref.setChecked(isEnabled);
+                if (inputMethodPrefsMap != null) {
+                    for (final Preference childPref: inputMethodPrefsMap.get(imiId)) {
+                        childPref.setEnabled(isEnabled);
+                    }
+                }
+                setSubtypesPreferenceEnabled(context, inputMethodInfos, imiId, isEnabled);
+            }
+        }
+        updateSubtypesPreferenceChecked(context, inputMethodInfos, enabledSubtypes);
+    }
+
+    private static void setSubtypesPreferenceEnabled(final PreferenceFragmentCompat context,
+            final List<InputMethodInfo> inputMethodProperties, final String id,
+            final boolean enabled) {
+        final PreferenceScreen preferenceScreen = context.getPreferenceScreen();
+        for (final InputMethodInfo imi : inputMethodProperties) {
+            if (id.equals(imi.getId())) {
+                final int subtypeCount = imi.getSubtypeCount();
+                for (int i = 0; i < subtypeCount; ++i) {
+                    final InputMethodSubtype subtype = imi.getSubtypeAt(i);
+                    final TwoStatePreference pref = (TwoStatePreference) preferenceScreen
+                            .findPreference(id + subtype.hashCode());
+                    if (pref != null) {
+                        pref.setEnabled(enabled);
+                    }
+                }
+            }
+        }
+    }
+
+    private static void updateSubtypesPreferenceChecked(final PreferenceFragmentCompat context,
+            final List<InputMethodInfo> inputMethodProperties,
+            final HashMap<String, HashSet<String>> enabledSubtypes) {
+        final PreferenceScreen preferenceScreen = context.getPreferenceScreen();
+        for (final InputMethodInfo imi : inputMethodProperties) {
+            final String id = imi.getId();
+            if (!enabledSubtypes.containsKey(id)) {
+                // There is no need to enable/disable subtypes of disabled IMEs.
+                continue;
+            }
+            final HashSet<String> enabledSubtypesSet = enabledSubtypes.get(id);
+            final int subtypeCount = imi.getSubtypeCount();
+            for (int i = 0; i < subtypeCount; ++i) {
+                final InputMethodSubtype subtype = imi.getSubtypeAt(i);
+                final String hashCode = String.valueOf(subtype.hashCode());
+                if (DEBUG) {
+                    Log.d(TAG, "--- Set checked state: " + "id" + ", " + hashCode + ", "
+                            + enabledSubtypesSet.contains(hashCode));
+                }
+                final TwoStatePreference pref = (TwoStatePreference) preferenceScreen
+                        .findPreference(id + hashCode);
+                if (pref != null) {
+                    pref.setChecked(enabledSubtypesSet.contains(hashCode));
+                }
+            }
+        }
+    }
+
+    public static void removeUnnecessaryNonPersistentPreference(final Preference pref) {
+        final String key = pref.getKey();
+        if (pref.isPersistent() || key == null) {
+            return;
+        }
+        final SharedPreferences prefs = pref.getSharedPreferences();
+        if (prefs != null && prefs.contains(key)) {
+            prefs.edit().remove(key).apply();
+        }
+    }
+
+    @NonNull
+    public static String getSubtypeLocaleNameAsSentence(@Nullable InputMethodSubtype subtype,
+            @NonNull final Context context, @NonNull final InputMethodInfo inputMethodInfo) {
+        if (subtype == null) {
+            return "";
+        }
+        final Locale locale = getDisplayLocale(context);
+        final CharSequence subtypeName = subtype.getDisplayName(context,
+                inputMethodInfo.getPackageName(), inputMethodInfo.getServiceInfo()
+                        .applicationInfo);
+        return LocaleHelper.toSentenceCase(subtypeName.toString(), locale);
+    }
+
+    @NonNull
+    public static String getSubtypeLocaleNameListAsSentence(
+            @NonNull final List<InputMethodSubtype> subtypes, @NonNull final Context context,
+            @NonNull final InputMethodInfo inputMethodInfo) {
+        if (subtypes.isEmpty()) {
+            return "";
+        }
+        final Locale locale = getDisplayLocale(context);
+        final int subtypeCount = subtypes.size();
+        final CharSequence[] subtypeNames = new CharSequence[subtypeCount];
+        for (int i = 0; i < subtypeCount; i++) {
+            subtypeNames[i] = subtypes.get(i).getDisplayName(context,
+                    inputMethodInfo.getPackageName(), inputMethodInfo.getServiceInfo()
+                            .applicationInfo);
+        }
+        return LocaleHelper.toSentenceCase(
+                ListFormatter.getInstance(locale).format((Object[]) subtypeNames), locale);
+    }
+
+    @NonNull
+    private static Locale getDisplayLocale(@Nullable final Context context) {
+        if (context == null) {
+            return Locale.getDefault();
+        }
+        if (context.getResources() == null) {
+            return Locale.getDefault();
+        }
+        final Configuration configuration = context.getResources().getConfiguration();
+        if (configuration == null) {
+            return Locale.getDefault();
+        }
+        final Locale configurationLocale = configuration.getLocales().get(0);
+        if (configurationLocale == null) {
+            return Locale.getDefault();
+        }
+        return configurationLocale;
+    }
+
+    public static boolean isValidSystemNonAuxAsciiCapableIme(InputMethodInfo imi) {
+        if (imi.isAuxiliaryIme() || !imi.isSystem()) {
+            return false;
+        }
+        final int subtypeCount = imi.getSubtypeCount();
+        for (int i = 0; i < subtypeCount; ++i) {
+            final InputMethodSubtype subtype = imi.getSubtypeAt(i);
+            if (SUBTYPE_MODE_KEYBOARD.equalsIgnoreCase(subtype.getMode())
+                    && subtype.isAsciiCapable()) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/license/LicenseHtmlLoaderCompat.java b/packages/SettingsLib/src/com/android/settingslib/license/LicenseHtmlLoaderCompat.java
new file mode 100644
index 000000000000..d7c14ad66baa
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/license/LicenseHtmlLoaderCompat.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.license;
+
+import android.content.Context;
+import android.util.Log;
+
+import com.android.settingslib.utils.AsyncLoaderCompat;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+import androidx.annotation.VisibleForTesting;
+
+/**
+ * LicenseHtmlLoader is a loader which loads a license html file from default license xml files.
+ */
+public class LicenseHtmlLoaderCompat extends AsyncLoaderCompat<File> {
+    private static final String TAG = "LicenseHtmlLoaderCompat";
+
+    private static final String[] DEFAULT_LICENSE_XML_PATHS = {
+            "/system/etc/NOTICE.xml.gz",
+            "/vendor/etc/NOTICE.xml.gz",
+            "/odm/etc/NOTICE.xml.gz",
+            "/oem/etc/NOTICE.xml.gz"};
+    private static final String NOTICE_HTML_FILE_NAME = "NOTICE.html";
+
+    private Context mContext;
+
+    public LicenseHtmlLoaderCompat(Context context) {
+        super(context);
+        mContext = context;
+    }
+
+    @Override
+    public File loadInBackground() {
+        return generateHtmlFromDefaultXmlFiles();
+    }
+
+    @Override
+    protected void onDiscardResult(File f) {
+    }
+
+    private File generateHtmlFromDefaultXmlFiles() {
+        final List<File> xmlFiles = getVaildXmlFiles();
+        if (xmlFiles.isEmpty()) {
+            Log.e(TAG, "No notice file exists.");
+            return null;
+        }
+
+        File cachedHtmlFile = getCachedHtmlFile();
+        if (!isCachedHtmlFileOutdated(xmlFiles, cachedHtmlFile)
+                || generateHtmlFile(xmlFiles, cachedHtmlFile)) {
+            return cachedHtmlFile;
+        }
+
+        return null;
+    }
+
+    @VisibleForTesting
+    List<File> getVaildXmlFiles() {
+        final List<File> xmlFiles = new ArrayList();
+        for (final String xmlPath : DEFAULT_LICENSE_XML_PATHS) {
+            File file = new File(xmlPath);
+            if (file.exists() && file.length() != 0) {
+                xmlFiles.add(file);
+            }
+        }
+        return xmlFiles;
+    }
+
+    @VisibleForTesting
+    File getCachedHtmlFile() {
+        return new File(mContext.getCacheDir(), NOTICE_HTML_FILE_NAME);
+    }
+
+    @VisibleForTesting
+    boolean isCachedHtmlFileOutdated(List<File> xmlFiles, File cachedHtmlFile) {
+        boolean outdated = true;
+        if (cachedHtmlFile.exists() && cachedHtmlFile.length() != 0) {
+            outdated = false;
+            for (File file : xmlFiles) {
+                if (cachedHtmlFile.lastModified() < file.lastModified()) {
+                    outdated = true;
+                    break;
+                }
+            }
+        }
+        return outdated;
+    }
+
+    @VisibleForTesting
+    boolean generateHtmlFile(List<File> xmlFiles, File htmlFile) {
+        return LicenseHtmlGeneratorFromXml.generateHtml(xmlFiles, htmlFile);
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/net/ChartDataLoaderCompat.java b/packages/SettingsLib/src/com/android/settingslib/net/ChartDataLoaderCompat.java
new file mode 100644
index 000000000000..3adbd4d01ca0
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/net/ChartDataLoaderCompat.java
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.net;
+
+import static android.net.NetworkStats.SET_DEFAULT;
+import static android.net.NetworkStats.SET_FOREGROUND;
+import static android.net.NetworkStats.TAG_NONE;
+import static android.net.NetworkStatsHistory.FIELD_RX_BYTES;
+import static android.net.NetworkStatsHistory.FIELD_TX_BYTES;
+import static android.text.format.DateUtils.HOUR_IN_MILLIS;
+
+import android.content.Context;
+import android.net.INetworkStatsSession;
+import android.net.NetworkStatsHistory;
+import android.net.NetworkTemplate;
+import android.os.Bundle;
+import android.os.RemoteException;
+
+import com.android.settingslib.AppItem;
+
+import androidx.loader.content.AsyncTaskLoader;
+
+/**
+ * Loader for historical chart data for both network and UID details.
+ */
+public class ChartDataLoaderCompat extends AsyncTaskLoader<ChartData> {
+    private static final String KEY_TEMPLATE = "template";
+    private static final String KEY_APP = "app";
+    private static final String KEY_FIELDS = "fields";
+
+    private final INetworkStatsSession mSession;
+    private final Bundle mArgs;
+
+    public static Bundle buildArgs(NetworkTemplate template, AppItem app) {
+        return buildArgs(template, app, FIELD_RX_BYTES | FIELD_TX_BYTES);
+    }
+
+    public static Bundle buildArgs(NetworkTemplate template, AppItem app, int fields) {
+        final Bundle args = new Bundle();
+        args.putParcelable(KEY_TEMPLATE, template);
+        args.putParcelable(KEY_APP, app);
+        args.putInt(KEY_FIELDS, fields);
+        return args;
+    }
+
+    public ChartDataLoaderCompat(Context context, INetworkStatsSession session, Bundle args) {
+        super(context);
+        mSession = session;
+        mArgs = args;
+    }
+
+    @Override
+    protected void onStartLoading() {
+        super.onStartLoading();
+        forceLoad();
+    }
+
+    @Override
+    public ChartData loadInBackground() {
+        final NetworkTemplate template = mArgs.getParcelable(KEY_TEMPLATE);
+        final AppItem app = mArgs.getParcelable(KEY_APP);
+        final int fields = mArgs.getInt(KEY_FIELDS);
+
+        try {
+            return loadInBackground(template, app, fields);
+        } catch (RemoteException e) {
+            // since we can't do much without history, and we don't want to
+            // leave with half-baked UI, we bail hard.
+            throw new RuntimeException("problem reading network stats", e);
+        }
+    }
+
+    private ChartData loadInBackground(NetworkTemplate template, AppItem app, int fields)
+            throws RemoteException {
+        final ChartData data = new ChartData();
+        data.network = mSession.getHistoryForNetwork(template, fields);
+
+        if (app != null) {
+            // load stats for current uid and template
+            final int size = app.uids.size();
+            for (int i = 0; i < size; i++) {
+                final int uid = app.uids.keyAt(i);
+                data.detailDefault = collectHistoryForUid(
+                        template, uid, SET_DEFAULT, data.detailDefault);
+                data.detailForeground = collectHistoryForUid(
+                        template, uid, SET_FOREGROUND, data.detailForeground);
+            }
+
+            if (size > 0) {
+                data.detail = new NetworkStatsHistory(data.detailForeground.getBucketDuration());
+                data.detail.recordEntireHistory(data.detailDefault);
+                data.detail.recordEntireHistory(data.detailForeground);
+            } else {
+                data.detailDefault = new NetworkStatsHistory(HOUR_IN_MILLIS);
+                data.detailForeground = new NetworkStatsHistory(HOUR_IN_MILLIS);
+                data.detail = new NetworkStatsHistory(HOUR_IN_MILLIS);
+            }
+        }
+
+        return data;
+    }
+
+    @Override
+    protected void onStopLoading() {
+        super.onStopLoading();
+        cancelLoad();
+    }
+
+    @Override
+    protected void onReset() {
+        super.onReset();
+        cancelLoad();
+    }
+
+    /**
+     * Collect {@link NetworkStatsHistory} for the requested UID, combining with
+     * an existing {@link NetworkStatsHistory} if provided.
+     */
+    private NetworkStatsHistory collectHistoryForUid(
+            NetworkTemplate template, int uid, int set, NetworkStatsHistory existing)
+            throws RemoteException {
+        final NetworkStatsHistory history = mSession.getHistoryForUid(
+                template, uid, set, TAG_NONE, FIELD_RX_BYTES | FIELD_TX_BYTES);
+
+        if (existing != null) {
+            existing.recordEntireHistory(history);
+            return existing;
+        } else {
+            return history;
+        }
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/net/SummaryForAllUidLoaderCompat.java b/packages/SettingsLib/src/com/android/settingslib/net/SummaryForAllUidLoaderCompat.java
new file mode 100644
index 000000000000..c311337d6cf5
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/net/SummaryForAllUidLoaderCompat.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.net;
+
+import android.content.Context;
+import android.net.INetworkStatsSession;
+import android.net.NetworkStats;
+import android.net.NetworkTemplate;
+import android.os.Bundle;
+import android.os.RemoteException;
+
+import androidx.loader.content.AsyncTaskLoader;
+
+public class SummaryForAllUidLoaderCompat extends AsyncTaskLoader<NetworkStats> {
+    private static final String KEY_TEMPLATE = "template";
+    private static final String KEY_START = "start";
+    private static final String KEY_END = "end";
+
+    private final INetworkStatsSession mSession;
+    private final Bundle mArgs;
+
+    public static Bundle buildArgs(NetworkTemplate template, long start, long end) {
+        final Bundle args = new Bundle();
+        args.putParcelable(KEY_TEMPLATE, template);
+        args.putLong(KEY_START, start);
+        args.putLong(KEY_END, end);
+        return args;
+    }
+
+    public SummaryForAllUidLoaderCompat(Context context, INetworkStatsSession session,
+            Bundle args) {
+        super(context);
+        mSession = session;
+        mArgs = args;
+    }
+
+    @Override
+    protected void onStartLoading() {
+        super.onStartLoading();
+        forceLoad();
+    }
+
+    @Override
+    public NetworkStats loadInBackground() {
+        final NetworkTemplate template = mArgs.getParcelable(KEY_TEMPLATE);
+        final long start = mArgs.getLong(KEY_START);
+        final long end = mArgs.getLong(KEY_END);
+
+        try {
+            return mSession.getSummaryForAllUid(template, start, end, false);
+        } catch (RemoteException e) {
+            return null;
+        }
+    }
+
+    @Override
+    protected void onStopLoading() {
+        super.onStopLoading();
+        cancelLoad();
+    }
+
+    @Override
+    protected void onReset() {
+        super.onReset();
+        cancelLoad();
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/suggestions/SuggestionControllerMixinCompat.java b/packages/SettingsLib/src/com/android/settingslib/suggestions/SuggestionControllerMixinCompat.java
new file mode 100644
index 000000000000..179121739896
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/suggestions/SuggestionControllerMixinCompat.java
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.suggestions;
+
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.os.Bundle;
+import android.service.settings.suggestions.Suggestion;
+import android.util.Log;
+
+import com.android.settingslib.core.lifecycle.Lifecycle;
+
+import java.util.List;
+
+import androidx.annotation.Nullable;
+import androidx.lifecycle.OnLifecycleEvent;
+import androidx.loader.app.LoaderManager;
+import androidx.loader.content.Loader;
+
+/**
+ * Manages IPC communication to SettingsIntelligence for suggestion related services.
+ */
+public class SuggestionControllerMixinCompat implements
+        SuggestionController.ServiceConnectionListener, androidx.lifecycle.LifecycleObserver,
+        LoaderManager.LoaderCallbacks<List<Suggestion>> {
+
+    public interface SuggestionControllerHost {
+        /**
+         * Called when suggestion data fetching is ready.
+         */
+        void onSuggestionReady(List<Suggestion> data);
+
+        /**
+         * Returns {@link LoaderManager} associated with the host. If host is not attached to
+         * activity then return null.
+         */
+        @Nullable
+        LoaderManager getLoaderManager();
+    }
+
+    private static final String TAG = "SuggestionCtrlMixin";
+    private static final boolean DEBUG = false;
+
+    private final Context mContext;
+    private final SuggestionController mSuggestionController;
+    private final SuggestionControllerHost mHost;
+
+    private boolean mSuggestionLoaded;
+
+    public SuggestionControllerMixinCompat(Context context, SuggestionControllerHost host,
+            Lifecycle lifecycle, ComponentName componentName) {
+        mContext = context.getApplicationContext();
+        mHost = host;
+        mSuggestionController = new SuggestionController(mContext, componentName,
+                    this /* serviceConnectionListener */);
+        if (lifecycle != null) {
+            lifecycle.addObserver(this);
+        }
+    }
+
+    @OnLifecycleEvent(Lifecycle.Event.ON_START)
+    public void onStart() {
+        if (DEBUG) {
+            Log.d(TAG, "SuggestionController started");
+        }
+        mSuggestionController.start();
+    }
+
+    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
+    public void onStop() {
+        if (DEBUG) {
+            Log.d(TAG, "SuggestionController stopped.");
+        }
+        mSuggestionController.stop();
+    }
+
+    @Override
+    public void onServiceConnected() {
+        final LoaderManager loaderManager = mHost.getLoaderManager();
+        if (loaderManager != null) {
+            loaderManager.restartLoader(SuggestionLoader.LOADER_ID_SUGGESTIONS,
+                    null /* args */, this /* callback */);
+        }
+    }
+
+    @Override
+    public void onServiceDisconnected() {
+        if (DEBUG) {
+            Log.d(TAG, "SuggestionService disconnected");
+        }
+        final LoaderManager loaderManager = mHost.getLoaderManager();
+        if (loaderManager != null) {
+            loaderManager.destroyLoader(SuggestionLoader.LOADER_ID_SUGGESTIONS);
+        }
+    }
+
+    @Override
+    public Loader<List<Suggestion>> onCreateLoader(int id, Bundle args) {
+        if (id == SuggestionLoader.LOADER_ID_SUGGESTIONS) {
+            mSuggestionLoaded = false;
+            return new SuggestionLoaderCompat(mContext, mSuggestionController);
+        }
+        throw new IllegalArgumentException("This loader id is not supported " + id);
+    }
+
+    @Override
+    public void onLoadFinished(Loader<List<Suggestion>> loader, List<Suggestion> data) {
+        mSuggestionLoaded = true;
+        mHost.onSuggestionReady(data);
+    }
+
+    @Override
+    public void onLoaderReset(Loader<List<Suggestion>> loader) {
+        mSuggestionLoaded = false;
+    }
+
+    public boolean isSuggestionLoaded() {
+        return mSuggestionLoaded;
+    }
+
+    public void dismissSuggestion(Suggestion suggestion) {
+        mSuggestionController.dismissSuggestions(suggestion);
+    }
+
+    public void launchSuggestion(Suggestion suggestion) {
+        mSuggestionController.launchSuggestion(suggestion);
+    }
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/suggestions/SuggestionLoaderCompat.java b/packages/SettingsLib/src/com/android/settingslib/suggestions/SuggestionLoaderCompat.java
new file mode 100644
index 000000000000..066de19172de
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/suggestions/SuggestionLoaderCompat.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.suggestions;
+
+import android.content.Context;
+import android.service.settings.suggestions.Suggestion;
+import android.util.Log;
+
+import com.android.settingslib.utils.AsyncLoaderCompat;
+
+import java.util.List;
+
+public class SuggestionLoaderCompat extends AsyncLoaderCompat<List<Suggestion>> {
+
+    public static final int LOADER_ID_SUGGESTIONS = 42;
+    private static final String TAG = "SuggestionLoader";
+
+    private final SuggestionController mSuggestionController;
+
+    public SuggestionLoaderCompat(Context context, SuggestionController controller) {
+        super(context);
+        mSuggestionController = controller;
+    }
+
+    @Override
+    protected void onDiscardResult(List<Suggestion> result) {
+
+    }
+
+    @Override
+    public List<Suggestion> loadInBackground() {
+        final List<Suggestion> data = mSuggestionController.getSuggestions();
+        if (data == null) {
+            Log.d(TAG, "data is null");
+        } else {
+            Log.d(TAG, "data size " + data.size());
+        }
+        return data;
+    }
+}
\ No newline at end of file
diff --git a/packages/SettingsLib/src/com/android/settingslib/utils/AsyncLoaderCompat.java b/packages/SettingsLib/src/com/android/settingslib/utils/AsyncLoaderCompat.java
new file mode 100644
index 000000000000..916d7e312631
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/utils/AsyncLoaderCompat.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.utils;
+
+import android.content.Context;
+
+import androidx.loader.content.AsyncTaskLoader;
+
+/**
+ * This class fills in some boilerplate for AsyncTaskLoader to actually load things.
+ *
+ * Subclasses need to implement {@link AsyncLoaderCompat#loadInBackground()} to perform the actual
+ * background task, and {@link AsyncLoaderCompat#onDiscardResult(T)} to clean up previously loaded
+ * results.
+ *
+ * This loader is based on the MailAsyncTaskLoader from the AOSP EmailUnified repo.
+ *
+ * @param <T> the data type to be loaded.
+ */
+public abstract class AsyncLoaderCompat<T> extends AsyncTaskLoader<T> {
+    private T mResult;
+
+    public AsyncLoaderCompat(final Context context) {
+        super(context);
+    }
+
+    @Override
+    protected void onStartLoading() {
+        if (mResult != null) {
+            deliverResult(mResult);
+        }
+
+        if (takeContentChanged() || mResult == null) {
+            forceLoad();
+        }
+    }
+
+    @Override
+    protected void onStopLoading() {
+        cancelLoad();
+    }
+
+    @Override
+    public void deliverResult(final T data) {
+        if (isReset()) {
+            if (data != null) {
+                onDiscardResult(data);
+            }
+            return;
+        }
+
+        final T oldResult = mResult;
+        mResult = data;
+
+        if (isStarted()) {
+            super.deliverResult(data);
+        }
+
+        if (oldResult != null && oldResult != mResult) {
+            onDiscardResult(oldResult);
+        }
+    }
+
+    @Override
+    protected void onReset() {
+        super.onReset();
+
+        onStopLoading();
+
+        if (mResult != null) {
+            onDiscardResult(mResult);
+        }
+        mResult = null;
+    }
+
+    @Override
+    public void onCanceled(final T data) {
+        super.onCanceled(data);
+
+        if (data != null) {
+            onDiscardResult(data);
+        }
+    }
+
+    /**
+     * Called when discarding the load results so subclasses can take care of clean-up or
+     * recycling tasks. This is not called if the same result (by way of pointer equality) is
+     * returned again by a subsequent call to loadInBackground, or if result is null.
+     *
+     * Note that this may be called concurrently with loadInBackground(), and in some circumstances
+     * may be called more than once for a given object.
+     *
+     * @param result The value returned from {@link AsyncLoaderCompat#loadInBackground()} which
+     *               is to be discarded.
+     */
+    protected abstract void onDiscardResult(T result);
+}
diff --git a/packages/SettingsLib/src/com/android/settingslib/widget/FooterPreferenceMixinCompat.java b/packages/SettingsLib/src/com/android/settingslib/widget/FooterPreferenceMixinCompat.java
new file mode 100644
index 000000000000..260ac838cb32
--- /dev/null
+++ b/packages/SettingsLib/src/com/android/settingslib/widget/FooterPreferenceMixinCompat.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.widget;
+
+import android.content.Context;
+
+import com.android.settingslib.core.lifecycle.Lifecycle;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.SetPreferenceScreen;
+
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceScreen;
+
+public class FooterPreferenceMixinCompat implements LifecycleObserver, SetPreferenceScreen {
+
+    private final PreferenceFragmentCompat mFragment;
+    private FooterPreference mFooterPreference;
+
+    public FooterPreferenceMixinCompat(PreferenceFragmentCompat fragment, Lifecycle lifecycle) {
+        mFragment = fragment;
+        lifecycle.addObserver(this);
+    }
+
+    @Override
+    public void setPreferenceScreen(PreferenceScreen preferenceScreen) {
+        if (mFooterPreference != null) {
+            preferenceScreen.addPreference(mFooterPreference);
+        }
+    }
+
+    /**
+     * Creates a new {@link FooterPreference}.
+     */
+    public FooterPreference createFooterPreference() {
+        final PreferenceScreen screen = mFragment.getPreferenceScreen();
+        if (mFooterPreference != null && screen != null) {
+            screen.removePreference(mFooterPreference);
+        }
+        mFooterPreference = new FooterPreference(getPrefContext());
+
+        if (screen != null) {
+            screen.addPreference(mFooterPreference);
+        }
+        return mFooterPreference;
+    }
+
+    /**
+     * Returns an UI context with theme properly set for new Preference objects.
+     */
+    private Context getPrefContext() {
+        return mFragment.getPreferenceManager().getContext();
+    }
+
+    public boolean hasFooter() {
+        return mFooterPreference != null;
+    }
+}
+
diff --git a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/CustomEditTextPreferenceComaptTest.java b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/CustomEditTextPreferenceComaptTest.java
new file mode 100644
index 000000000000..9ba996752f49
--- /dev/null
+++ b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/CustomEditTextPreferenceComaptTest.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.view.View;
+import android.widget.EditText;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.util.ReflectionHelpers;
+
+@RunWith(SettingsLibRobolectricTestRunner.class)
+public class CustomEditTextPreferenceComaptTest {
+
+    @Mock
+    private View mView;
+
+    private TestPreference mPreference;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mPreference = new TestPreference(RuntimeEnvironment.application);
+    }
+
+    @Test
+    public void bindDialogView_shouldRequestFocus() {
+        final String testText = "";
+        final EditText editText = spy(new EditText(RuntimeEnvironment.application));
+        editText.setText(testText);
+        when(mView.findViewById(android.R.id.edit)).thenReturn(editText);
+
+        mPreference.onBindDialogView(mView);
+
+        verify(editText).requestFocus();
+    }
+
+    @Test
+    public void getEditText_noDialog_shouldNotCrash() {
+        ReflectionHelpers.setField(mPreference, "mFragment",
+                mock(CustomEditTextPreferenceCompat.CustomPreferenceDialogFragment.class));
+
+        mPreference.getEditText();
+
+        // no crash
+    }
+
+    private static class TestPreference extends CustomEditTextPreferenceCompat {
+        public TestPreference(Context context) {
+            super(context);
+        }
+    }
+}
diff --git a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/inputmethod/InputMethodAndSubtypeUtilCompatTest.java b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/inputmethod/InputMethodAndSubtypeUtilCompatTest.java
new file mode 100644
index 000000000000..ddadac105c18
--- /dev/null
+++ b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/inputmethod/InputMethodAndSubtypeUtilCompatTest.java
@@ -0,0 +1,271 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.inputmethod;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.pm.ApplicationInfo;
+import android.content.pm.ResolveInfo;
+import android.content.pm.ServiceInfo;
+import android.view.inputmethod.InputMethodInfo;
+import android.view.inputmethod.InputMethodSubtype;
+import android.view.inputmethod.InputMethodSubtype.InputMethodSubtypeBuilder;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+
+@RunWith(RobolectricTestRunner.class)
+public class InputMethodAndSubtypeUtilCompatTest {
+
+    private static final HashSet<String> EMPTY_STRING_SET = new HashSet<>();
+
+    private static HashSet<String> asHashSet(String... strings) {
+        HashSet<String> hashSet = new HashSet<>();
+        for (String s : strings) {
+            hashSet.add(s);
+        }
+        return hashSet;
+    }
+
+    @Test
+    public void parseInputMethodsAndSubtypesString_EmptyString() {
+        assertThat(InputMethodAndSubtypeUtilCompat.
+                parseInputMethodsAndSubtypesString("")).isEmpty();
+        assertThat(InputMethodAndSubtypeUtilCompat.
+                parseInputMethodsAndSubtypesString(null)).isEmpty();
+    }
+
+    @Test
+    public void parseInputMethodsAndSubtypesString_SingleImeNoSubtype() {
+        HashMap<String, HashSet<String>> r =
+                InputMethodAndSubtypeUtilCompat.parseInputMethodsAndSubtypesString("ime0");
+        assertThat(r).containsExactly("ime0", EMPTY_STRING_SET);
+    }
+
+    @Test
+    public void parseInputMethodsAndSubtypesString_MultipleImesNoSubtype() {
+        HashMap<String, HashSet<String>> r =
+                InputMethodAndSubtypeUtilCompat.parseInputMethodsAndSubtypesString("ime0:ime1");
+        assertThat(r).containsExactly("ime0", EMPTY_STRING_SET, "ime1", EMPTY_STRING_SET);
+    }
+
+    @Test
+    public void parseInputMethodsAndSubtypesString_SingleImeSingleSubtype() {
+        HashMap<String, HashSet<String>> r =
+                InputMethodAndSubtypeUtilCompat.parseInputMethodsAndSubtypesString("ime0;subtype0");
+        assertThat(r).containsExactly("ime0", asHashSet("subtype0"));
+    }
+
+    @Test
+    public void parseInputMethodsAndSubtypesString_SingleImeDuplicateSameSubtypes() {
+        HashMap<String, HashSet<String>> r =
+                InputMethodAndSubtypeUtilCompat.parseInputMethodsAndSubtypesString(
+                        "ime0;subtype0;subtype0");
+        assertThat(r).containsExactly("ime0", asHashSet("subtype0"));
+    }
+
+    @Test
+    public void parseInputMethodsAndSubtypesString_SingleImeMultipleSubtypes() {
+        HashMap<String, HashSet<String>> r =
+                InputMethodAndSubtypeUtilCompat.parseInputMethodsAndSubtypesString(
+                        "ime0;subtype0;subtype1");
+        assertThat(r).containsExactly("ime0", asHashSet("subtype0", "subtype1"));
+    }
+
+    @Test
+    public void parseInputMethodsAndSubtypesString_MultiplePairsOfImeSubtype() {
+        assertThat(InputMethodAndSubtypeUtilCompat.parseInputMethodsAndSubtypesString(
+                "ime0;subtype0:ime1;subtype1"))
+                .containsExactly("ime0", asHashSet("subtype0"), "ime1", asHashSet("subtype1"));
+        assertThat(InputMethodAndSubtypeUtilCompat.parseInputMethodsAndSubtypesString(
+                "ime0;subtype0;subtype1:ime1;subtype2"))
+                .containsExactly("ime0", asHashSet("subtype0", "subtype1"),
+                        "ime1", asHashSet("subtype2"));
+        assertThat(InputMethodAndSubtypeUtilCompat.parseInputMethodsAndSubtypesString(
+                "ime0;subtype0;subtype1:ime1;subtype1;subtype2"))
+                .containsExactly("ime0", asHashSet("subtype0", "subtype1"),
+                        "ime1", asHashSet("subtype1", "subtype2"));
+
+    }
+
+    @Test
+    public void parseInputMethodsAndSubtypesString_MixedImeSubtypePairsAndImeNoSubtype() {
+        HashMap<String, HashSet<String>> r =
+                InputMethodAndSubtypeUtilCompat.parseInputMethodsAndSubtypesString(
+                        "ime0;subtype0;subtype1:ime1;subtype1;subtype2:ime2");
+        assertThat(r).containsExactly("ime0", asHashSet("subtype0", "subtype1"),
+                "ime1", asHashSet("subtype1", "subtype2"),
+                "ime2", EMPTY_STRING_SET);
+    }
+
+    @Test
+    public void buildInputMethodsAndSubtypesString_EmptyInput() {
+        HashMap<String, HashSet<String>> map = new HashMap<>();
+        assertThat(map).isEmpty();
+    }
+
+    @Test
+    public void buildInputMethodsAndSubtypesString_SingleIme() {
+        HashMap<String, HashSet<String>> map = new HashMap<>();
+        map.put("ime0", new HashSet<>());
+        String result = InputMethodAndSubtypeUtilCompat.buildInputMethodsAndSubtypesString(map);
+        assertThat(result).isEqualTo("ime0");
+    }
+
+    @Test
+    public void buildInputMethodsAndSubtypesString_SingleImeSingleSubtype() {
+        HashMap<String, HashSet<String>> map = new HashMap<>();
+        map.put("ime0", asHashSet("subtype0"));
+        String result = InputMethodAndSubtypeUtilCompat.buildInputMethodsAndSubtypesString(map);
+        assertThat(result).isEqualTo("ime0;subtype0");
+    }
+
+    @Test
+    public void buildInputMethodsAndSubtypesString_SingleImeMultipleSubtypes() {
+        HashMap<String, HashSet<String>> map = new HashMap<>();
+        map.put("ime0", asHashSet("subtype0", "subtype1"));
+        String result = InputMethodAndSubtypeUtilCompat.buildInputMethodsAndSubtypesString(map);
+
+        // We do not expect what order will be used to concatenate items in
+        // InputMethodAndSubtypeUtil.buildInputMethodsAndSubtypesString() hence accept all possible
+        // permutations here.
+        assertThat(result).matches("ime0;subtype0;subtype1|ime0;subtype1;subtype0");
+    }
+
+    @Test
+    public void buildInputMethodsAndSubtypesString_MultipleImesNoSubtypes() {
+        HashMap<String, HashSet<String>> map = new HashMap<>();
+        map.put("ime0", EMPTY_STRING_SET);
+        map.put("ime1", EMPTY_STRING_SET);
+        String result = InputMethodAndSubtypeUtilCompat.buildInputMethodsAndSubtypesString(map);
+
+        // We do not expect what order will be used to concatenate items in
+        // InputMethodAndSubtypeUtil.buildInputMethodsAndSubtypesString() hence accept all possible
+        // permutations here.
+        assertThat(result).matches("ime0:ime1|ime1:ime0");
+    }
+
+    @Test
+    public void buildInputMethodsAndSubtypesString_MultipleImesWithAndWithoutSubtypes() {
+        HashMap<String, HashSet<String>> map = new HashMap<>();
+        map.put("ime0", asHashSet("subtype0", "subtype1"));
+        map.put("ime1", EMPTY_STRING_SET);
+        String result = InputMethodAndSubtypeUtilCompat.buildInputMethodsAndSubtypesString(map);
+
+        // We do not expect what order will be used to concatenate items in
+        // InputMethodAndSubtypeUtil.buildInputMethodsAndSubtypesString() hence accept all possible
+        // permutations here.
+        assertThat(result).matches("ime0;subtype0;subtype1:ime1|ime0;subtype1;subtype0:ime1"
+                + "|ime1:ime0;subtype0;subtype1|ime1:ime0;subtype1;subtype0");
+    }
+
+    @Test
+    public void buildInputMethodsAndSubtypesString_MultipleImesWithSubtypes() {
+        HashMap<String, HashSet<String>> map = new HashMap<>();
+        map.put("ime0", asHashSet("subtype0", "subtype1"));
+        map.put("ime1", asHashSet("subtype2", "subtype3"));
+        String result = InputMethodAndSubtypeUtilCompat.buildInputMethodsAndSubtypesString(map);
+
+        // We do not expect what order will be used to concatenate items in
+        // InputMethodAndSubtypeUtil.buildInputMethodsAndSubtypesString() hence accept all possible
+        // permutations here.
+        assertThat(result).matches("ime0;subtype0;subtype1:ime1;subtype2;subtype3"
+                + "|ime0;subtype1;subtype0:ime1;subtype2;subtype3"
+                + "|ime0;subtype0;subtype1:ime1;subtype3;subtype2"
+                + "|ime0;subtype1;subtype0:ime1;subtype3;subtype2"
+                + "|ime1;subtype2;subtype3:ime0;subtype0;subtype1"
+                + "|ime2;subtype3;subtype2:ime0;subtype0;subtype1"
+                + "|ime3;subtype2;subtype3:ime0;subtype1;subtype0"
+                + "|ime4;subtype3;subtype2:ime0;subtype1;subtype0");
+    }
+
+    @Test
+    public void isValidSystemNonAuxAsciiCapableIme() {
+        // System IME w/ no subtype
+        assertThat(InputMethodAndSubtypeUtilCompat.isValidSystemNonAuxAsciiCapableIme(
+                createDummyIme(true, false)))
+                .isFalse();
+
+        // System IME w/ non-Aux and non-ASCII-capable "keyboard" subtype
+        assertThat(InputMethodAndSubtypeUtilCompat.isValidSystemNonAuxAsciiCapableIme(
+                createDummyIme(true, false, createDummySubtype("keyboard", false, false))))
+                .isFalse();
+
+        // System IME w/ non-Aux and ASCII-capable "keyboard" subtype
+        assertThat(InputMethodAndSubtypeUtilCompat.isValidSystemNonAuxAsciiCapableIme(
+                createDummyIme(true, false, createDummySubtype("keyboard", false, true))))
+                .isTrue();
+
+        // System IME w/ Aux and ASCII-capable "keyboard" subtype
+        assertThat(InputMethodAndSubtypeUtilCompat.isValidSystemNonAuxAsciiCapableIme(
+                createDummyIme(true, true, createDummySubtype("keyboard", true, true))))
+                .isFalse();
+
+        // System IME w/ non-Aux and ASCII-capable "voice" subtype
+        assertThat(InputMethodAndSubtypeUtilCompat.isValidSystemNonAuxAsciiCapableIme(
+                createDummyIme(true, false, createDummySubtype("voice", false, true))))
+                .isFalse();
+
+        // System IME w/ non-Aux and non-ASCII-capable subtype + Non-Aux and ASCII-capable subtype
+        assertThat(InputMethodAndSubtypeUtilCompat.isValidSystemNonAuxAsciiCapableIme(
+                createDummyIme(true, false,
+                        createDummySubtype("keyboard", false, true),
+                        createDummySubtype("keyboard", false, false))))
+                .isTrue();
+
+        // Non-system IME w/ non-Aux and ASCII-capable "keyboard" subtype
+        assertThat(InputMethodAndSubtypeUtilCompat.isValidSystemNonAuxAsciiCapableIme(
+                createDummyIme(false, false, createDummySubtype("keyboard", false, true))))
+                .isFalse();
+   }
+
+    private static InputMethodInfo createDummyIme(boolean isSystem, boolean isAuxIme,
+            InputMethodSubtype... subtypes) {
+        final ResolveInfo ri = new ResolveInfo();
+        final ServiceInfo si = new ServiceInfo();
+        final ApplicationInfo ai = new ApplicationInfo();
+        ai.packageName = "com.example.android.dummyime";
+        ai.enabled = true;
+        ai.flags |= (isSystem ? ApplicationInfo.FLAG_SYSTEM : 0);
+        si.applicationInfo = ai;
+        si.enabled = true;
+        si.packageName = "com.example.android.dummyime";
+        si.name = "Dummy IME";
+        si.exported = true;
+        si.nonLocalizedLabel = "Dummy IME";
+        ri.serviceInfo = si;
+        return new InputMethodInfo(ri, isAuxIme, "",  Arrays.asList(subtypes), 1, false);
+    }
+
+    private static InputMethodSubtype createDummySubtype(
+            String mode, boolean isAuxiliary, boolean isAsciiCapable) {
+        return new InputMethodSubtypeBuilder()
+                .setSubtypeNameResId(0)
+                .setSubtypeIconResId(0)
+                .setSubtypeLocale("en_US")
+                .setLanguageTag("en-US")
+                .setSubtypeMode(mode)
+                .setIsAuxiliary(isAuxiliary)
+                .setIsAsciiCapable(isAsciiCapable)
+                .build();
+    }
+}
diff --git a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/license/LicenseHtmlLoaderCompatTest.java b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/license/LicenseHtmlLoaderCompatTest.java
new file mode 100644
index 000000000000..f981f365ec2b
--- /dev/null
+++ b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/license/LicenseHtmlLoaderCompatTest.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.license;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+
+import com.android.settingslib.SettingsLibRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import java.io.File;
+import java.util.ArrayList;
+
+@RunWith(SettingsLibRobolectricTestRunner.class)
+public class LicenseHtmlLoaderCompatTest {
+    @Mock
+    private Context mContext;
+
+    LicenseHtmlLoaderCompat newLicenseHtmlLoader(ArrayList<File> xmlFiles,
+            File cachedHtmlFile, boolean isCachedHtmlFileOutdated,
+            boolean generateHtmlFileSucceeded) {
+        LicenseHtmlLoaderCompat loader = spy(new LicenseHtmlLoaderCompat(mContext));
+        doReturn(xmlFiles).when(loader).getVaildXmlFiles();
+        doReturn(cachedHtmlFile).when(loader).getCachedHtmlFile();
+        doReturn(isCachedHtmlFileOutdated).when(loader).isCachedHtmlFileOutdated(any(), any());
+        doReturn(generateHtmlFileSucceeded).when(loader).generateHtmlFile(any(), any());
+        return loader;
+    }
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+    }
+
+    @Test
+    public void testLoadInBackground() {
+        ArrayList<File> xmlFiles = new ArrayList();
+        xmlFiles.add(new File("test.xml"));
+        File cachedHtmlFile = new File("test.html");
+
+        LicenseHtmlLoaderCompat loader = newLicenseHtmlLoader(xmlFiles, cachedHtmlFile, true, true);
+
+        assertThat(loader.loadInBackground()).isEqualTo(cachedHtmlFile);
+        verify(loader).generateHtmlFile(any(), any());
+    }
+
+    @Test
+    public void testLoadInBackgroundWithNoVaildXmlFiles() {
+        ArrayList<File> xmlFiles = new ArrayList();
+        File cachedHtmlFile = new File("test.html");
+
+        LicenseHtmlLoaderCompat loader = newLicenseHtmlLoader(xmlFiles, cachedHtmlFile, true, true);
+
+        assertThat(loader.loadInBackground()).isNull();
+        verify(loader, never()).generateHtmlFile(any(), any());
+    }
+
+    @Test
+    public void testLoadInBackgroundWithNonOutdatedCachedHtmlFile() {
+        ArrayList<File> xmlFiles = new ArrayList();
+        xmlFiles.add(new File("test.xml"));
+        File cachedHtmlFile = new File("test.html");
+
+        LicenseHtmlLoaderCompat loader = newLicenseHtmlLoader(xmlFiles, cachedHtmlFile, false,
+                true);
+
+        assertThat(loader.loadInBackground()).isEqualTo(cachedHtmlFile);
+        verify(loader, never()).generateHtmlFile(any(), any());
+    }
+
+    @Test
+    public void testLoadInBackgroundWithGenerateHtmlFileFailed() {
+        ArrayList<File> xmlFiles = new ArrayList();
+        xmlFiles.add(new File("test.xml"));
+        File cachedHtmlFile = new File("test.html");
+
+        LicenseHtmlLoaderCompat loader = newLicenseHtmlLoader(xmlFiles, cachedHtmlFile, true,
+                false);
+
+        assertThat(loader.loadInBackground()).isNull();
+        verify(loader).generateHtmlFile(any(), any());
+    }
+}
diff --git a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/suggestions/SuggestionControllerMixinCompatTest.java b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/suggestions/SuggestionControllerMixinCompatTest.java
new file mode 100644
index 000000000000..1ee3afa9c1ce
--- /dev/null
+++ b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/suggestions/SuggestionControllerMixinCompatTest.java
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.suggestions;
+
+import static androidx.lifecycle.Lifecycle.Event.ON_START;
+import static androidx.lifecycle.Lifecycle.Event.ON_STOP;
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.ComponentName;
+import android.content.Context;
+
+import com.android.settingslib.SettingsLibRobolectricTestRunner;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+import androidx.lifecycle.LifecycleOwner;
+import androidx.loader.app.LoaderManager;
+
+@RunWith(SettingsLibRobolectricTestRunner.class)
+@Config(shadows = ShadowSuggestionController.class)
+public class SuggestionControllerMixinCompatTest {
+
+    @Mock
+    private SuggestionControllerMixinCompat.SuggestionControllerHost mHost;
+
+    private Context mContext;
+    private LifecycleOwner mLifecycleOwner;
+    private Lifecycle mLifecycle;
+    private SuggestionControllerMixinCompat mMixin;
+    private ComponentName mComponentName;
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = RuntimeEnvironment.application;
+        mLifecycleOwner = () -> mLifecycle;
+        mLifecycle = new Lifecycle(mLifecycleOwner);
+        mComponentName = new ComponentName(
+                "com.android.settings.intelligence",
+                "com.android.settings.intelligence.suggestions.SuggestionService");
+    }
+
+    @After
+    public void tearDown() {
+        ShadowSuggestionController.reset();
+    }
+
+    @Test
+    public void goThroughLifecycle_onStartStop_shouldStartStopController() {
+        mMixin = new SuggestionControllerMixinCompat(mContext, mHost, mLifecycle, mComponentName);
+
+        mLifecycle.handleLifecycleEvent(ON_START);
+        assertThat(ShadowSuggestionController.sStartCalled).isTrue();
+
+        mLifecycle.handleLifecycleEvent(ON_STOP);
+        assertThat(ShadowSuggestionController.sStopCalled).isTrue();
+    }
+
+    @Test
+    public void onServiceConnected_shouldGetSuggestion() {
+        final LoaderManager loaderManager = mock(LoaderManager.class);
+        when(mHost.getLoaderManager()).thenReturn(loaderManager);
+
+        mMixin = new SuggestionControllerMixinCompat(mContext, mHost, mLifecycle, mComponentName);
+        mMixin.onServiceConnected();
+
+        verify(loaderManager).restartLoader(SuggestionLoader.LOADER_ID_SUGGESTIONS,
+                null /* args */, mMixin /* callback */);
+    }
+
+    @Test
+    public void onServiceConnected_hostNotAttached_shouldDoNothing() {
+        when(mHost.getLoaderManager()).thenReturn(null);
+
+        mMixin = new SuggestionControllerMixinCompat(mContext, mHost, mLifecycle, mComponentName);
+        mMixin.onServiceConnected();
+
+        verify(mHost).getLoaderManager();
+    }
+
+    @Test
+    public void onServiceDisconnected_hostNotAttached_shouldDoNothing() {
+        when(mHost.getLoaderManager()).thenReturn(null);
+
+        mMixin = new SuggestionControllerMixinCompat(mContext, mHost, mLifecycle, mComponentName);
+        mMixin.onServiceDisconnected();
+
+        verify(mHost).getLoaderManager();
+    }
+
+    @Test
+    public void doneLoadingg_shouldSetSuggestionLoaded() {
+        mMixin = new SuggestionControllerMixinCompat(mContext, mHost, mLifecycle, mComponentName);
+
+        mMixin.onLoadFinished(mock(SuggestionLoaderCompat.class), null);
+
+        assertThat(mMixin.isSuggestionLoaded()).isTrue();
+
+        mMixin.onLoaderReset(mock(SuggestionLoaderCompat.class));
+
+        assertThat(mMixin.isSuggestionLoaded()).isFalse();
+    }
+}
diff --git a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/FooterPreferenceMixinCompatTest.java b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/FooterPreferenceMixinCompatTest.java
new file mode 100644
index 000000000000..1abbaba441ee
--- /dev/null
+++ b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/FooterPreferenceMixinCompatTest.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.widget;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import com.android.settingslib.SettingsLibRobolectricTestRunner;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.shadows.ShadowApplication;
+
+import androidx.lifecycle.LifecycleOwner;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+
+@RunWith(SettingsLibRobolectricTestRunner.class)
+public class FooterPreferenceMixinCompatTest {
+
+    @Mock
+    private PreferenceFragmentCompat mFragment;
+    @Mock
+    private PreferenceScreen mScreen;
+
+    private LifecycleOwner mLifecycleOwner;
+    private Lifecycle mLifecycle;
+    private FooterPreferenceMixinCompat mMixin;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mLifecycleOwner = () -> mLifecycle;
+        mLifecycle = new Lifecycle(mLifecycleOwner);
+        when(mFragment.getPreferenceManager()).thenReturn(mock(PreferenceManager.class));
+        when(mFragment.getPreferenceManager().getContext())
+                .thenReturn(ShadowApplication.getInstance().getApplicationContext());
+        mMixin = new FooterPreferenceMixinCompat(mFragment, mLifecycle);
+    }
+
+    @Test
+    public void createFooter_screenNotAvailable_noCrash() {
+        assertThat(mMixin.createFooterPreference()).isNotNull();
+    }
+
+    @Test
+    public void createFooter_screenAvailable_canAttachToScreen() {
+        when(mFragment.getPreferenceScreen()).thenReturn(mScreen);
+
+        final FooterPreference preference = mMixin.createFooterPreference();
+
+        assertThat(preference).isNotNull();
+        verify(mScreen).addPreference(preference);
+    }
+
+    @Test
+    public void createFooter_screenAvailableDelayed_canAttachToScreen() {
+        final FooterPreference preference = mMixin.createFooterPreference();
+
+        mLifecycle.setPreferenceScreen(mScreen);
+
+        assertThat(preference).isNotNull();
+        verify(mScreen).addPreference(preference);
+    }
+
+    @Test
+    public void createFooterTwice_screenAvailable_replaceOldFooter() {
+        when(mFragment.getPreferenceScreen()).thenReturn(mScreen);
+
+        mMixin.createFooterPreference();
+        mMixin.createFooterPreference();
+
+        verify(mScreen).removePreference(any(FooterPreference.class));
+        verify(mScreen, times(2)).addPreference(any(FooterPreference.class));
+    }
+
+}
diff --git a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/FooterPreferenceMixinTest.java b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/FooterPreferenceMixinTest.java
index 78b7616716f5..8604d186f2dd 100644
--- a/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/FooterPreferenceMixinTest.java
+++ b/packages/SettingsLib/tests/robotests/src/com/android/settingslib/widget/FooterPreferenceMixinTest.java
@@ -23,11 +23,6 @@ import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
-import androidx.lifecycle.LifecycleOwner;
-import androidx.preference.PreferenceFragment;
-import androidx.preference.PreferenceManager;
-import androidx.preference.PreferenceScreen;
-
 import com.android.settingslib.SettingsLibRobolectricTestRunner;
 import com.android.settingslib.core.lifecycle.Lifecycle;
 
@@ -38,6 +33,11 @@ import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.shadows.ShadowApplication;
 
+import androidx.lifecycle.LifecycleOwner;
+import androidx.preference.PreferenceFragment;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+
 @RunWith(SettingsLibRobolectricTestRunner.class)
 public class FooterPreferenceMixinTest {