| /* |
| * Copyright 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.car.media.common.source; |
| |
| import static com.android.car.apps.common.util.CarAppsDebugUtils.idHash; |
| import static com.android.car.arch.common.LiveDataFunctions.dataOf; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.app.Application; |
| import android.content.ComponentName; |
| import android.content.ContentValues; |
| import android.database.ContentObserver; |
| import android.database.Cursor; |
| import android.media.session.MediaController; |
| import android.os.Handler; |
| import android.os.RemoteException; |
| import android.support.v4.media.MediaBrowserCompat; |
| import android.support.v4.media.session.MediaControllerCompat; |
| import android.support.v4.media.session.MediaSessionCompat; |
| import android.util.Log; |
| |
| import androidx.annotation.VisibleForTesting; |
| import androidx.lifecycle.AndroidViewModel; |
| import androidx.lifecycle.LiveData; |
| import androidx.lifecycle.MutableLiveData; |
| |
| import com.android.car.media.common.MediaConstants; |
| |
| import java.util.Objects; |
| |
| /** |
| * Contains observable data needed for displaying playback and browse UI. |
| * MediaSourceViewModel is a singleton tied to the application to provide a single source of truth. |
| */ |
| public class MediaSourceViewModel extends AndroidViewModel { |
| private static final String TAG = "MediaSourceViewModel"; |
| |
| private static MediaSourceViewModel sInstance; |
| |
| // Primary media source. |
| private final MutableLiveData<MediaSource> mPrimaryMediaSource = dataOf(null); |
| // Connected browser for the primary media source. |
| private final MutableLiveData<MediaBrowserCompat> mConnectedMediaBrowser = dataOf(null); |
| // Media controller for the connected browser. |
| private final MutableLiveData<MediaControllerCompat> mMediaController = dataOf(null); |
| |
| /** |
| * Factory for creating dependencies. Can be swapped out for testing. |
| */ |
| @VisibleForTesting |
| interface InputFactory { |
| MediaBrowserConnector createMediaBrowserConnector(@NonNull Application application, |
| @NonNull MediaBrowserConnector.Callback connectedBrowserCallback); |
| |
| MediaControllerCompat getControllerForSession(@Nullable MediaSessionCompat.Token session); |
| |
| MediaSource getSelectedSourceFromContentProvider(); |
| } |
| |
| /** Returns the MediaSourceViewModel singleton tied to the application. */ |
| public static MediaSourceViewModel get(@NonNull Application application) { |
| if (sInstance == null) { |
| sInstance = new MediaSourceViewModel(application); |
| } |
| return sInstance; |
| } |
| |
| /** |
| * Create a new instance of MediaSourceViewModel |
| * |
| * @see AndroidViewModel |
| */ |
| private MediaSourceViewModel(@NonNull Application application) { |
| this(application, new InputFactory() { |
| @Override |
| public MediaBrowserConnector createMediaBrowserConnector( |
| @NonNull Application application, |
| @NonNull MediaBrowserConnector.Callback connectedBrowserCallback) { |
| return new MediaBrowserConnector(application, connectedBrowserCallback); |
| } |
| |
| @Override |
| public MediaControllerCompat getControllerForSession( |
| @Nullable MediaSessionCompat.Token token) { |
| if (token == null) return null; |
| try { |
| return new MediaControllerCompat(application, token); |
| } catch (RemoteException e) { |
| Log.e(TAG, "Couldn't get MediaControllerCompat", e); |
| return null; |
| } |
| } |
| |
| @Override |
| public MediaSource getSelectedSourceFromContentProvider() { |
| Cursor cursor = application.getContentResolver().query( |
| MediaConstants.URI_MEDIA_SOURCE, null, null, null); |
| try { |
| if (cursor != null && cursor.moveToFirst()) { |
| return new MediaSource(application, cursor.getString(0)); |
| } |
| return null; |
| } finally { |
| if (cursor != null) { |
| cursor.close(); |
| } |
| } |
| } |
| }); |
| } |
| |
| private final InputFactory mInputFactory; |
| private final MediaBrowserConnector mBrowserConnector; |
| private final MediaBrowserConnector.Callback mConnectedBrowserCallback; |
| |
| @VisibleForTesting |
| MediaSourceViewModel(@NonNull Application application, @NonNull InputFactory inputFactory) { |
| super(application); |
| |
| mInputFactory = inputFactory; |
| |
| mConnectedBrowserCallback = browser -> { |
| mConnectedMediaBrowser.setValue(browser); |
| if (browser != null) { |
| if (!browser.isConnected()) { |
| Log.e(TAG, "Browser is NOT connected !! " |
| + mPrimaryMediaSource.getValue().getPackageName() + idHash(browser)); |
| mMediaController.setValue(null); |
| } else { |
| mMediaController.setValue(mInputFactory.getControllerForSession( |
| browser.getSessionToken())); |
| } |
| } else { |
| mMediaController.setValue(null); |
| } |
| }; |
| mBrowserConnector = inputFactory.createMediaBrowserConnector(application, |
| mConnectedBrowserCallback); |
| |
| updateModelState(); |
| application.getContentResolver().registerContentObserver(MediaConstants.URI_MEDIA_SOURCE, |
| false, mMediaSourceObserver); |
| |
| } |
| |
| private final ContentObserver mMediaSourceObserver = new ContentObserver(new Handler()) { |
| @Override |
| public void onChange(boolean selfChange) { |
| updateModelState(); |
| } |
| }; |
| |
| @VisibleForTesting |
| ContentObserver getMediaSourceObserver() { |
| return mMediaSourceObserver; |
| } |
| |
| @VisibleForTesting |
| MediaBrowserConnector.Callback getConnectedBrowserCallback() { |
| return mConnectedBrowserCallback; |
| } |
| |
| /** |
| * Returns a LiveData that emits the MediaSource that is to be browsed or displayed. |
| */ |
| public LiveData<MediaSource> getPrimaryMediaSource() { |
| return mPrimaryMediaSource; |
| } |
| |
| /** |
| * Updates the primary media source, and notifies content provider of new source |
| */ |
| public void setPrimaryMediaSource(MediaSource mediaSource) { |
| ContentValues values = new ContentValues(); |
| values.put(MediaConstants.KEY_PACKAGE_NAME, mediaSource.getPackageName()); |
| getApplication().getContentResolver().update( |
| MediaConstants.URI_MEDIA_SOURCE, values, null, null); |
| } |
| |
| /** |
| * Returns a LiveData that emits the currently connected MediaBrowser. Emits {@code null} if no |
| * MediaSource is set, if the MediaSource does not support browsing, or if the MediaBrowser is |
| * not connected. |
| */ |
| public LiveData<MediaBrowserCompat> getConnectedMediaBrowser() { |
| return mConnectedMediaBrowser; |
| } |
| |
| /** |
| * Returns a LiveData that emits a {@link MediaController} that allows controlling this media |
| * source, or emits {@code null} if the media source doesn't support browsing or the browser is |
| * not connected. |
| */ |
| public LiveData<MediaControllerCompat> getMediaController() { |
| return mMediaController; |
| } |
| |
| private void updateModelState() { |
| MediaSource oldMediaSource = mPrimaryMediaSource.getValue(); |
| MediaSource newMediaSource = mInputFactory.getSelectedSourceFromContentProvider(); |
| if (Objects.equals(oldMediaSource, newMediaSource)) { |
| return; |
| } |
| |
| // Reset dependent values to avoid propagating inconsistencies. |
| mMediaController.setValue(null); |
| mConnectedMediaBrowser.setValue(null); |
| mBrowserConnector.connectTo(null); |
| |
| // Broadcast the new source |
| mPrimaryMediaSource.setValue(newMediaSource); |
| |
| // Recompute dependent values |
| if (newMediaSource == null) { |
| return; |
| } |
| |
| ComponentName browseService = newMediaSource.getBrowseServiceComponentName(); |
| if (browseService == null) { |
| Log.e(TAG, "No browseService for source: " + newMediaSource.getPackageName()); |
| } |
| mBrowserConnector.connectTo(browseService); |
| } |
| } |