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POAndroid can't bind to service
 

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    <p>New to android, trying to figure out Services. I'm trying to bind a service to an activity, I'm following the examples in the documentation, but I keep getting a NullPointerException on the line marked below(appService.playSong(title)). Checking it in the debugger reveals that appService is indeed null. </p> <pre><code>public class Song extends Activity implements OnClickListener,Runnable { protected static int currentPosition; private ProgressBar progress; private TextView songTitle; private MPService appService; private ServiceConnection onService = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder rawBinder) { appService = ((MPService.LocalBinder)rawBinder).getService(); } public void onServiceDisconnected(ComponentName classname) { appService = null; } }; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.song); Intent bindIntent = new Intent(Song.this,MPService.class); bindService(bindIntent,onService, Context.BIND_AUTO_CREATE); Bundle b = getIntent().getBundleExtra("songdata"); String title = b.getString("song title"); // ... appService.playSong(title); // nullpointerexception // ... } </code></pre> <p>Here's the relevant part of the service:</p> <pre><code>package org.example.music; // imports public class MPService extends Service { private MediaPlayer mp; public static int currentPosition = 0; public List&lt;String&gt; songs = new ArrayList&lt;String&gt;(); public static String songTitle; private static final String MEDIA_PATH = new String("/mnt/sdcard/"); @Override public void onCreate() { super.onCreate(); mp = new MediaPlayer(); songs = Music.songs; } @Override public int onStartCommand(Intent intent, int flags, int startId) { return Service.START_STICKY; } public class LocalBinder extends Binder { MPService getService() { return MPService.this; } } private final IBinder binder = new LocalBinder(); @Override public IBinder onBind(Intent intent) { return binder; } public void playSong(String songPath) { try { mp.reset(); mp.setDataSource(songPath); mp.prepare(); mp.start(); mp.setOnCompletionListener(new OnCompletionListener() { public void onCompletion(MediaPlayer arg0) { nextSong(); } }); songTitle = songPath.substring(12,songPath.length()-4); } catch (IOException e) { Log.v(getString(R.string.app_name),e.getMessage()); } } public void nextSong() { if (++currentPosition &gt;= songs.size()) { currentPosition = 0; } String song = MEDIA_PATH+songs.get(currentPosition); playSong(song); } public void prevSong() { if (--currentPosition&lt;0) { currentPosition=songs.size()-1; } String song = Music.MEDIA_PATH+songs.get(currentPosition); playSong(song); } public int getSongPosition() { return mp.getCurrentPosition(); } public MediaPlayer getMP() { return mp; } } </code></pre> <p>I have registered the service in AndroidManifest.xml and set android:enabled="true". Do you see any obvious mistakes here?</p>
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