Docsui-level work for implementing Eject on Roots list.

1. Added Eject Icon for Roots that support eject
2. Added Context Menu for RootsFragment (Settings and Eject)

Bug: 29584653
Change-Id: I97f582de05763e3f0327bc0d2dc6d4e2222e047c
(cherry picked from commit d96661f8b0f613b40f2bdfc178bbe06022b5f76c)

1 files changed, 70 insertions, 0 deletions

diff --git a/packages/DocumentsUI/src/com/android/documentsui/EjectRootTask.java b/packages/DocumentsUI/src/com/android/documentsui/EjectRootTask.java
new file mode 100644
index 000000000000..fcee47232071
--- /dev/null
+++ b/packages/DocumentsUI/src/com/android/documentsui/EjectRootTask.java
@@ -0,0 +1,70 @@
+/*
+ * 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.documentsui;
+
+import android.content.ContentProviderClient;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.net.Uri;
+import android.provider.DocumentsContract;
+import android.util.Log;
+
+import java.util.function.Consumer;
+
+final class EjectRootTask
+        extends CheckedTask<Void, Boolean> {
+    private final String mAuthority;
+    private final String mRootId;
+    private final Consumer<Boolean> mListener;
+    private Context mContext;
+
+    public EjectRootTask(Check check,
+            String authority,
+            String rootId,
+            Context context,
+            Consumer<Boolean> listener) {
+        super(check);
+        mAuthority = authority;
+        mRootId = rootId;
+        mContext = context;
+        mListener = listener;
+    }
+
+    @Override
+    protected Boolean run(Void... params) {
+        final ContentResolver resolver = mContext.getContentResolver();
+
+        Uri rootUri = DocumentsContract.buildRootUri(mAuthority, mRootId);
+        ContentProviderClient client = null;
+        try {
+            client = DocumentsApplication.acquireUnstableProviderOrThrow(
+                    resolver, mAuthority);
+            return DocumentsContract.ejectRoot(client, rootUri);
+        } catch (Exception e) {
+            Log.w(Shared.TAG, "Failed to eject root", e);
+        } finally {
+            ContentProviderClient.releaseQuietly(client);
+        }
+
+        return false;
+    }
+
+    @Override
+    protected void finish(Boolean ejected) {
+        mListener.accept(ejected);
+    }
+}
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