/**
* Starts playing the next song. If manualUrl is null, the next song will be randomly selected
* from our Media Retriever (that is, it will be a random song in the user's device). If manualUrl
* is non-null, then it specifies the URL or path to the song that will be played next.
*/
void playNextSong(String manualUrl) {
mState = State.Stopped;
relaxResources(false); // release everything except MediaPlayer
try {
if (manualUrl != null) {
// set the source of the media player to a manual URL or path
createMediaPlayerIfNeeded();
mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mPlayer.setDataSource(manualUrl);
mSongTitle = manualUrl;
mIsStreaming = manualUrl.startsWith("http:") || manualUrl.startsWith("https:");
} else {
mIsStreaming = false; // playing a locally available song
MusicRetriever.Item item = mRetriever.getRandomItem();
if (item == null) {
say("No song to play :-(");
return;
}
// set the source of the media player a a content URI
createMediaPlayerIfNeeded();
mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mPlayer.setDataSource(getApplicationContext(), item.getURI());
mSongTitle = item.getTitle();
}
mState = State.Preparing;
setUpAsForeground(mSongTitle + " (loading)");
// starts preparing the media player in the background. When it's done, it will call
// our OnPreparedListener (that is, the onPrepared() method on this class, since we set
// the listener to 'this').
//
// Until the media player is prepared, we *cannot* call start() on it!
mPlayer.prepareAsync();
// If we are streaming from the internet, we want to hold a Wifi lock, which prevents
// the Wifi radio from going to sleep while the song is playing. If, on the other hand,
// we are *not* streaming, we want to release the lock if we were holding it before.
if (mIsStreaming) mWifiLock.acquire();
else if (mWifiLock.isHeld()) mWifiLock.release();
} catch (IOException ex) {
Log.e("MusicService", "IOException playing next song: " + ex.getMessage());
ex.printStackTrace();
}
}
@Override
protected Void doInBackground(Void... arg0) {
mRetriever.prepare();
return null;
}