Implemented audiofocuschange listener

src/de/podfetcher/service/PlaybackService.java

@@ -7,9 +7,12 @@ import android.R;
 import android.app.Notification;
 import android.app.PendingIntent;
 import android.app.Service;
+import android.content.Context;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
+import android.media.AudioManager;
+import android.media.AudioManager.OnAudioFocusChangeListener;
 import android.media.MediaPlayer;
 import android.support.v4.app.NotificationCompat;
 import android.util.Log;
@@ -32,13 +35,12 @@ public class PlaybackService extends Service {
 	/** Contains the id of the Feed object of the FeedMedia. */
 	public static final String EXTRA_FEED_ID = "extra.de.podfetcher.service.feedId";
 
-	public static final String ACTION_PLAYER_STATUS_CHANGED =
+	public static final String ACTION_PLAYER_STATUS_CHANGED = "action.de.podfetcher.service.playerStatusChanged";
-			"action.de.podfetcher.service.playerStatusChanged";
 
 	private static final int NOTIFICATION_ID = 1;
 	private NotificationCompat.Builder notificationBuilder;
 
-	private Notification notification;
+	private AudioManager audioManager;
 	private MediaPlayer player;
 	private FeedMedia media;
 	private Feed feed;
@@ -67,6 +69,35 @@ public class PlaybackService extends Service {
 		return mBinder;
 	}
 
+	private void setupAudioManager() {
+		audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
+	}
+
+	private final OnAudioFocusChangeListener audioFocusChangeListener = new OnAudioFocusChangeListener() {
+
+		@Override
+		public void onAudioFocusChange(int focusChange) {
+			switch (focusChange) {
+			case AudioManager.AUDIOFOCUS_LOSS:
+				Log.d(TAG, "Lost audio focus");
+				pause();
+				stopSelf();
+				break;
+			case AudioManager.AUDIOFOCUS_GAIN:
+				Log.d(TAG, "Gained audio focus");
+				play();
+				break;
+			case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
+				Log.d(TAG, "Lost audio focus temporarily. Ducking...");
+				audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER, 0);
+				break;
+			case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
+				Log.d(TAG, "Lost audio focus temporarily. Pausing...");
+				pause();
+			}
+		}
+	};
+
 	@Override
 	public int onStartCommand(Intent intent, int flags, int startId) {
 		long mediaId = intent.getLongExtra(EXTRA_MEDIA_ID, -1);
@@ -74,6 +105,10 @@ public class PlaybackService extends Service {
 		if (mediaId == -1 || feedId == -1) {
 			Log.e(TAG, "Media ID or Feed ID wasn't provided to the Service.");
 		} else {
+			// Intent values appear to be valid
+			if (audioManager == null) {
+				setupAudioManager();
+			}
 			Feed newFeed = manager.getFeed(feedId);
 			FeedMedia newMedia = manager.getFeedMedia(mediaId, newFeed);
 			if (media != null && media != newMedia) {
@@ -97,7 +132,8 @@ public class PlaybackService extends Service {
 			} else if (media == null) {
 				media = newMedia;
 				feed = newFeed;
-				player = MediaPlayer.create(this, Uri.fromFile(new File(media.getFile_url())));
+				player = MediaPlayer.create(this,
+						Uri.fromFile(new File(media.getFile_url())));
 				setStatus(PlayerStatus.PREPARING);
 				player.setOnPreparedListener(preparedListener);
 				Log.d(TAG, "Preparing to play file");
@@ -132,7 +168,15 @@ public class PlaybackService extends Service {
 		public void onPrepared(MediaPlayer mp) {
 			Log.d(TAG, "Resource prepared");
 			setStatus(PlayerStatus.PREPARED);
+			int focusGained = audioManager.requestAudioFocus(
+					audioFocusChangeListener, AudioManager.STREAM_MUSIC,
+					AudioManager.AUDIOFOCUS_GAIN);
+			if (focusGained == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
+				Log.d(TAG, "Audiofocus successfully requested");
 				play();
+			} else {
+				Log.d(TAG, "Failed to request Audiofocus");
+			}
 		}
 	};
 
@@ -163,25 +207,27 @@ public class PlaybackService extends Service {
 	}
 
 	private void setupNotification() {
-		PendingIntent pIntent = PendingIntent.getActivity(
+		PendingIntent pIntent = PendingIntent.getActivity(this, 0, new Intent(
-				this, 0, new Intent(this, MediaplayerActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
+				this, MediaplayerActivity.class),
+				PendingIntent.FLAG_UPDATE_CURRENT);
 
-		Bitmap icon = BitmapFactory.decodeResource(null, R.drawable.stat_notify_sdcard);
+		Bitmap icon = BitmapFactory.decodeResource(null,
+				R.drawable.stat_notify_sdcard);
 		notificationBuilder = new NotificationCompat.Builder(this)
 				.setContentTitle("Mediaplayer Service")
-			.setContentInfo("Click here for more info")
+				.setContentText("Click here for more info").setOngoing(true)
-			.setOngoing(true)
+				.setContentIntent(pIntent).setLargeIcon(icon)
-			.setContentIntent(pIntent)
-			.setLargeIcon(icon)
 				.setSmallIcon(R.drawable.stat_notify_sdcard);
 
-					
 		startForeground(NOTIFICATION_ID, notificationBuilder.getNotification());
 		Log.d(TAG, "Notification set up");
 	}
 
-	/** Seek a specific position from the current position
+	/**
-	 * 	@param delta offset from current position (positive or negative)
+	 * Seek a specific position from the current position
+	 * 
+	 * @param delta
+	 *            offset from current position (positive or negative)
 	 * */
 	public void seekDelta(int delta) {
 		seek(player.getCurrentPosition() + delta);
@@ -222,7 +268,8 @@ public class PlaybackService extends Service {
 				try {
 					Thread.sleep(WAITING_INTERVALL);
 				} catch (InterruptedException e) {
-					Log.d(TAG, "Thread was interrupted while waiting. Finishing now...");
+					Log.d(TAG,
+							"Thread was interrupted while waiting. Finishing now...");
 					return null;
 				}
 				saveCurrentPosition();