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Diffstat (limited to 'samples/browseable/MediaBrowserService/src/com.example.android.mediabrowserservice/MediaNotification.java')
| -rw-r--r-- | samples/browseable/MediaBrowserService/src/com.example.android.mediabrowserservice/MediaNotification.java | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/samples/browseable/MediaBrowserService/src/com.example.android.mediabrowserservice/MediaNotification.java b/samples/browseable/MediaBrowserService/src/com.example.android.mediabrowserservice/MediaNotification.java new file mode 100644 index 000000000..7b8631a45 --- /dev/null +++ b/samples/browseable/MediaBrowserService/src/com.example.android.mediabrowserservice/MediaNotification.java @@ -0,0 +1,381 @@ +/* + * Copyright (C) 2014 Google Inc. All Rights Reserved. + * + * 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.example.android.mediabrowserservice; + +import android.app.Notification; +import android.app.NotificationManager; +import android.app.PendingIntent; +import android.content.BroadcastReceiver; +import android.content.Context; +import android.content.Intent; +import android.content.IntentFilter; +import android.content.pm.ApplicationInfo; +import android.content.pm.PackageManager; +import android.content.res.Resources; +import android.content.res.TypedArray; +import android.graphics.Bitmap; +import android.graphics.BitmapFactory; +import android.graphics.Color; +import android.media.MediaDescription; +import android.media.MediaMetadata; +import android.media.session.MediaController; +import android.media.session.MediaSession; +import android.media.session.PlaybackState; +import android.os.AsyncTask; +import android.util.LruCache; +import android.util.SparseArray; + +import com.example.android.mediabrowserservice.utils.BitmapHelper; +import com.example.android.mediabrowserservice.utils.LogHelper; + +import java.io.IOException; + +/** + * Keeps track of a notification and updates it automatically for a given + * MediaSession. Maintaining a visible notification (usually) guarantees that the music service + * won't be killed during playback. + */ +public class MediaNotification extends BroadcastReceiver { + private static final String TAG = "MediaNotification"; + + private static final int NOTIFICATION_ID = 412; + + public static final String ACTION_PAUSE = "com.example.android.mediabrowserservice.pause"; + public static final String ACTION_PLAY = "com.example.android.mediabrowserservice.play"; + public static final String ACTION_PREV = "com.example.android.mediabrowserservice.prev"; + public static final String ACTION_NEXT = "com.example.android.mediabrowserservice.next"; + + private static final int MAX_ALBUM_ART_CACHE_SIZE = 1024*1024; + + private final MusicService mService; + private MediaSession.Token mSessionToken; + private MediaController mController; + private MediaController.TransportControls mTransportControls; + private final SparseArray<PendingIntent> mIntents = new SparseArray<PendingIntent>(); + private final LruCache<String, Bitmap> mAlbumArtCache; + + private PlaybackState mPlaybackState; + private MediaMetadata mMetadata; + + private Notification.Builder mNotificationBuilder; + private NotificationManager mNotificationManager; + private Notification.Action mPlayPauseAction; + + private String mCurrentAlbumArt; + private int mNotificationColor; + + private boolean mStarted = false; + + public MediaNotification(MusicService service) { + mService = service; + updateSessionToken(); + + // simple album art cache that holds no more than + // MAX_ALBUM_ART_CACHE_SIZE bytes: + mAlbumArtCache = new LruCache<String, Bitmap>(MAX_ALBUM_ART_CACHE_SIZE) { + @Override + protected int sizeOf(String key, Bitmap value) { + return value.getByteCount(); + } + }; + + mNotificationColor = getNotificationColor(); + + mNotificationManager = (NotificationManager) mService + .getSystemService(Context.NOTIFICATION_SERVICE); + + String pkg = mService.getPackageName(); + mIntents.put(R.drawable.ic_pause_white_24dp, PendingIntent.getBroadcast(mService, 100, + new Intent(ACTION_PAUSE).setPackage(pkg), PendingIntent.FLAG_CANCEL_CURRENT)); + mIntents.put(R.drawable.ic_play_arrow_white_24dp, PendingIntent.getBroadcast(mService, 100, + new Intent(ACTION_PLAY).setPackage(pkg), PendingIntent.FLAG_CANCEL_CURRENT)); + mIntents.put(R.drawable.ic_skip_previous_white_24dp, PendingIntent.getBroadcast(mService, 100, + new Intent(ACTION_PREV).setPackage(pkg), PendingIntent.FLAG_CANCEL_CURRENT)); + mIntents.put(R.drawable.ic_skip_next_white_24dp, PendingIntent.getBroadcast(mService, 100, + new Intent(ACTION_NEXT).setPackage(pkg), PendingIntent.FLAG_CANCEL_CURRENT)); + } + + protected int getNotificationColor() { + int notificationColor = 0; + String packageName = mService.getPackageName(); + try { + Context packageContext = mService.createPackageContext(packageName, 0); + ApplicationInfo applicationInfo = + mService.getPackageManager().getApplicationInfo(packageName, 0); + packageContext.setTheme(applicationInfo.theme); + Resources.Theme theme = packageContext.getTheme(); + TypedArray ta = theme.obtainStyledAttributes( + new int[] {android.R.attr.colorPrimary}); + notificationColor = ta.getColor(0, Color.DKGRAY); + ta.recycle(); + } catch (PackageManager.NameNotFoundException e) { + e.printStackTrace(); + } + return notificationColor; + } + + /** + * Posts the notification and starts tracking the session to keep it + * updated. The notification will automatically be removed if the session is + * destroyed before {@link #stopNotification} is called. + */ + public void startNotification() { + if (!mStarted) { + mController.registerCallback(mCb); + IntentFilter filter = new IntentFilter(); + filter.addAction(ACTION_NEXT); + filter.addAction(ACTION_PAUSE); + filter.addAction(ACTION_PLAY); + filter.addAction(ACTION_PREV); + mService.registerReceiver(this, filter); + + mMetadata = mController.getMetadata(); + mPlaybackState = mController.getPlaybackState(); + + mStarted = true; + // The notification must be updated after setting started to true + updateNotificationMetadata(); + } + } + + /** + * Removes the notification and stops tracking the session. If the session + * was destroyed this has no effect. + */ + public void stopNotification() { + mStarted = false; + mController.unregisterCallback(mCb); + try { + mNotificationManager.cancel(NOTIFICATION_ID); + mService.unregisterReceiver(this); + } catch (IllegalArgumentException ex) { + // ignore if the receiver is not registered. + } + mService.stopForeground(true); + } + + @Override + public void onReceive(Context context, Intent intent) { + final String action = intent.getAction(); + LogHelper.d(TAG, "Received intent with action " + action); + if (ACTION_PAUSE.equals(action)) { + mTransportControls.pause(); + } else if (ACTION_PLAY.equals(action)) { + mTransportControls.play(); + } else if (ACTION_NEXT.equals(action)) { + mTransportControls.skipToNext(); + } else if (ACTION_PREV.equals(action)) { + mTransportControls.skipToPrevious(); + } + } + + /** + * Update the state based on a change on the session token. Called either when + * we are running for the first time or when the media session owner has destroyed the session + * (see {@link android.media.session.MediaController.Callback#onSessionDestroyed()}) + */ + private void updateSessionToken() { + MediaSession.Token freshToken = mService.getSessionToken(); + if (mSessionToken == null || !mSessionToken.equals(freshToken)) { + if (mController != null) { + mController.unregisterCallback(mCb); + } + mSessionToken = freshToken; + mController = new MediaController(mService, mSessionToken); + mTransportControls = mController.getTransportControls(); + if (mStarted) { + mController.registerCallback(mCb); + } + } + } + + private final MediaController.Callback mCb = new MediaController.Callback() { + @Override + public void onPlaybackStateChanged(PlaybackState state) { + mPlaybackState = state; + LogHelper.d(TAG, "Received new playback state", state); + updateNotificationPlaybackState(); + } + + @Override + public void onMetadataChanged(MediaMetadata metadata) { + mMetadata = metadata; + LogHelper.d(TAG, "Received new metadata ", metadata); + updateNotificationMetadata(); + } + + @Override + public void onSessionDestroyed() { + super.onSessionDestroyed(); + LogHelper.d(TAG, "Session was destroyed, resetting to the new session token"); + updateSessionToken(); + } + }; + + private void updateNotificationMetadata() { + LogHelper.d(TAG, "updateNotificationMetadata. mMetadata=" + mMetadata); + if (mMetadata == null || mPlaybackState == null) { + return; + } + + updatePlayPauseAction(); + + mNotificationBuilder = new Notification.Builder(mService); + int playPauseActionIndex = 0; + + // If skip to previous action is enabled + if ((mPlaybackState.getActions() & PlaybackState.ACTION_SKIP_TO_PREVIOUS) != 0) { + mNotificationBuilder + .addAction(R.drawable.ic_skip_previous_white_24dp, + mService.getString(R.string.label_previous), + mIntents.get(R.drawable.ic_skip_previous_white_24dp)); + playPauseActionIndex = 1; + } + + mNotificationBuilder.addAction(mPlayPauseAction); + + // If skip to next action is enabled + if ((mPlaybackState.getActions() & PlaybackState.ACTION_SKIP_TO_NEXT) != 0) { + mNotificationBuilder.addAction(R.drawable.ic_skip_next_white_24dp, + mService.getString(R.string.label_next), + mIntents.get(R.drawable.ic_skip_next_white_24dp)); + } + + MediaDescription description = mMetadata.getDescription(); + + String fetchArtUrl = null; + Bitmap art = description.getIconBitmap(); + if (art == null && description.getIconUri() != null) { + // This sample assumes the iconUri will be a valid URL formatted String, but + // it can actually be any valid Android Uri formatted String. + // async fetch the album art icon + String artUrl = description.getIconUri().toString(); + art = mAlbumArtCache.get(artUrl); + if (art == null) { + fetchArtUrl = artUrl; + // use a placeholder art while the remote art is being downloaded + art = BitmapFactory.decodeResource(mService.getResources(), R.drawable.ic_default_art); + } + } + + mNotificationBuilder + .setStyle(new Notification.MediaStyle() + .setShowActionsInCompactView(playPauseActionIndex) // only show play/pause in compact view + .setMediaSession(mSessionToken)) + .setColor(mNotificationColor) + .setSmallIcon(R.drawable.ic_notification) + .setVisibility(Notification.VISIBILITY_PUBLIC) + .setUsesChronometer(true) + .setContentTitle(description.getTitle()) + .setContentText(description.getSubtitle()) + .setLargeIcon(art); + + updateNotificationPlaybackState(); + + mService.startForeground(NOTIFICATION_ID, mNotificationBuilder.build()); + if (fetchArtUrl != null) { + fetchBitmapFromURLAsync(fetchArtUrl); + } + } + + private void updatePlayPauseAction() { + LogHelper.d(TAG, "updatePlayPauseAction"); + String playPauseLabel = ""; + int playPauseIcon; + if (mPlaybackState.getState() == PlaybackState.STATE_PLAYING) { + playPauseLabel = mService.getString(R.string.label_pause); + playPauseIcon = R.drawable.ic_pause_white_24dp; + } else { + playPauseLabel = mService.getString(R.string.label_play); + playPauseIcon = R.drawable.ic_play_arrow_white_24dp; + } + if (mPlayPauseAction == null) { + mPlayPauseAction = new Notification.Action(playPauseIcon, playPauseLabel, + mIntents.get(playPauseIcon)); + } else { + mPlayPauseAction.icon = playPauseIcon; + mPlayPauseAction.title = playPauseLabel; + mPlayPauseAction.actionIntent = mIntents.get(playPauseIcon); + } + } + + private void updateNotificationPlaybackState() { + LogHelper.d(TAG, "updateNotificationPlaybackState. mPlaybackState=" + mPlaybackState); + if (mPlaybackState == null || !mStarted) { + LogHelper.d(TAG, "updateNotificationPlaybackState. cancelling notification!"); + mService.stopForeground(true); + return; + } + if (mNotificationBuilder == null) { + LogHelper.d(TAG, "updateNotificationPlaybackState. there is no notificationBuilder. Ignoring request to update state!"); + return; + } + if (mPlaybackState.getPosition() >= 0) { + LogHelper.d(TAG, "updateNotificationPlaybackState. updating playback position to ", + (System.currentTimeMillis() - mPlaybackState.getPosition()) / 1000, " seconds"); + mNotificationBuilder + .setWhen(System.currentTimeMillis() - mPlaybackState.getPosition()) + .setShowWhen(true) + .setUsesChronometer(true); + mNotificationBuilder.setShowWhen(true); + } else { + LogHelper.d(TAG, "updateNotificationPlaybackState. hiding playback position"); + mNotificationBuilder + .setWhen(0) + .setShowWhen(false) + .setUsesChronometer(false); + } + + updatePlayPauseAction(); + + // Make sure that the notification can be dismissed by the user when we are not playing: + mNotificationBuilder.setOngoing(mPlaybackState.getState() == PlaybackState.STATE_PLAYING); + + mNotificationManager.notify(NOTIFICATION_ID, mNotificationBuilder.build()); + } + + public void fetchBitmapFromURLAsync(final String source) { + LogHelper.d(TAG, "getBitmapFromURLAsync: starting asynctask to fetch ", source); + new AsyncTask<Void, Void, Bitmap>() { + @Override + protected Bitmap doInBackground(Void[] objects) { + Bitmap bitmap = null; + try { + bitmap = BitmapHelper.fetchAndRescaleBitmap(source, + BitmapHelper.MEDIA_ART_BIG_WIDTH, BitmapHelper.MEDIA_ART_BIG_HEIGHT); + mAlbumArtCache.put(source, bitmap); + } catch (IOException e) { + LogHelper.e(TAG, e, "getBitmapFromURLAsync: " + source); + } + return bitmap; + } + + @Override + protected void onPostExecute(Bitmap bitmap) { + if (bitmap != null && mMetadata != null && + mNotificationBuilder != null && mMetadata.getDescription() != null && + !source.equals(mMetadata.getDescription().getIconUri())) { + // If the media is still the same, update the notification: + LogHelper.d(TAG, "getBitmapFromURLAsync: set bitmap to ", source); + mNotificationBuilder.setLargeIcon(bitmap); + mNotificationManager.notify(NOTIFICATION_ID, mNotificationBuilder.build()); + } + } + }.execute(); + } + +} |