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/*
* Copyright (C) 2021 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 androidx.window.common;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Handler;
import android.os.Looper;
import android.provider.Settings;
import android.text.TextUtils;
import android.util.Log;
import androidx.window.util.BaseDataProducer;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
/**
* Implementation of {@link androidx.window.util.DataProducer} that produces
* {@link CommonDisplayFeature} parsed from a string stored in {@link Settings}.
*/
public final class SettingsDisplayFeatureProducer
extends BaseDataProducer<List<DisplayFeature>> {
private static final boolean DEBUG = false;
private static final String TAG = "SettingsDisplayFeatureProducer";
private static final String DISPLAY_FEATURES = "display_features";
private final Uri mDisplayFeaturesUri =
Settings.Global.getUriFor(DISPLAY_FEATURES);
private final ContentResolver mResolver;
private final ContentObserver mObserver;
private boolean mRegisteredObservers;
public SettingsDisplayFeatureProducer(@NonNull Context context) {
mResolver = context.getContentResolver();
mObserver = new SettingsObserver();
}
@Override
@Nullable
public Optional<List<DisplayFeature>> getData() {
String displayFeaturesString = Settings.Global.getString(mResolver, DISPLAY_FEATURES);
if (displayFeaturesString == null) {
return Optional.empty();
}
List<DisplayFeature> features = new ArrayList<>();
if (TextUtils.isEmpty(displayFeaturesString)) {
return Optional.of(features);
}
String[] featureStrings = displayFeaturesString.split(";");
for (String featureString : featureStrings) {
CommonDisplayFeature feature;
try {
feature = CommonDisplayFeature.parseFromString(featureString);
} catch (IllegalArgumentException e) {
if (DEBUG) {
Log.w(TAG, "Failed to parse display feature: " + featureString, e);
}
continue;
}
features.add(feature);
}
return Optional.of(features);
}
/**
* Registers settings observers, if needed. When settings observers are registered for this
* producer callbacks for changes in data will be triggered.
*/
public void registerObserversIfNeeded() {
if (mRegisteredObservers) {
return;
}
mRegisteredObservers = true;
mResolver.registerContentObserver(mDisplayFeaturesUri, false /* notifyForDescendants */,
mObserver /* ContentObserver */);
}
/**
* Unregisters settings observers, if needed. When settings observers are unregistered for this
* producer callbacks for changes in data will not be triggered.
*/
public void unregisterObserversIfNeeded() {
if (!mRegisteredObservers) {
return;
}
mRegisteredObservers = false;
mResolver.unregisterContentObserver(mObserver);
}
private final class SettingsObserver extends ContentObserver {
SettingsObserver() {
super(new Handler(Looper.getMainLooper()));
}
@Override
public void onChange(boolean selfChange, Uri uri) {
if (mDisplayFeaturesUri.equals(uri)) {
notifyDataChanged();
}
}
}
}
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