Servicios android – error: servicio no registrado

Estoy tratando de entender los servicios limitados. Debajo de mi programa de ejemplo en el que intento seguir http://developer.android.com/guide/components/bound-services.html . El servicio funciona en la medida de lo que puedo reproducir, pausar y detener el audio, pero cuando cambio a otra aplicación me sale el siguiente servicio no registrado error.

java.lang.RuntimeException: Unable to stop activity {com.example.dd_services_audio_01/com.example.dd_services_audio_01.MainActivity}: java.lang.IllegalArgumentException: Service not registered: com.example.dd_services_audio_01.MainActivity$1@2afca5d8 09-05 14:04:32.625: E/AndroidRuntime(5810): at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:2451) 09-05 14:04:32.625: E/AndroidRuntime(5810): at android.app.ActivityThread.handleStopActivity(ActivityThread.java:2496) 

Como la codificación parece seguir el ejemplo de la documentación de cerca no tengo ni idea de dónde van las cosas mal. Ejecuto esta aplicación con minSdk nivel 8. El error ocurre en MainActivity.onStop en la línea

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  mService.unbindService(mConnection); 

Cualquier sugerencia para resolver esto sería grande.

Gracias

martín

 package com.example.dd_services_audio_01; import android.app.Activity; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.Environment; import android.os.IBinder; import android.util.Log; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import com.example.dd_services_audio_01.AudioPlayerService.AudioPlayerBinder; public class MainActivity extends Activity { private final String TAG = "MainActivity"; AudioPlayerService mService; boolean mBound = false; Button mPlay, mPause, mStop; String audioFile = Environment.getExternalStorageDirectory() + "/justdzongsar/DJKR_AboutToGetIt.mp3"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.d(TAG,"onCreate"); setContentView(R.layout.activity_main); mPlay = (Button) findViewById(R.id.buttonPlay); mPause = (Button) findViewById(R.id.buttonPause); mStop = (Button) findViewById(R.id.buttonStop); mPlay.setOnClickListener(new OnClickListener() { public void onClick(View v) { mService.play(audioFile); } }); mPause.setOnClickListener(new OnClickListener() { public void onClick(View v) { mService.pause(); } }); mStop.setOnClickListener(new OnClickListener() { public void onClick(View v) { mService.stop(); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } @Override protected void onStart() { super.onStart(); // Bind to LocalService Intent intent = new Intent(this, AudioPlayerService.class); bindService(intent, mConnection, Context.BIND_AUTO_CREATE); } @Override protected void onStop() { super.onStop(); if (mBound) { mService.unbindService(mConnection); mBound=false; } } /** Defines callbacks for service binding, passed to bindService() */ private ServiceConnection mConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName className, IBinder service) { // We've bound to LocalService, cast the IBinder and get // LocalService instance AudioPlayerBinder binder = (AudioPlayerBinder) service; mService = binder.getService(); mBound = true; } @Override public void onServiceDisconnected(ComponentName arg0) { mService = null; mBound = false; } }; } 

y

 package com.example.dd_services_audio_01; import java.io.IOException; import android.app.Service; import android.content.Intent; import android.media.MediaPlayer; import android.media.MediaPlayer.OnCompletionListener; import android.media.MediaPlayer.OnPreparedListener; import android.os.Binder; import android.os.IBinder; import android.util.Log; public class AudioPlayerService extends Service implements OnPreparedListener, OnCompletionListener { private final String TAG = "AudioPlayerService"; private final IBinder mBinder = new AudioPlayerBinder(); private MediaPlayer mMediaPlayer; private String currentDataSource; public class AudioPlayerBinder extends Binder { public AudioPlayerService getService() { Log.v(TAG, "AudioPlayerBinder: getService() called"); return AudioPlayerService.this; } } @Override public IBinder onBind(Intent intent) { // TODO Auto-generated method stub return mBinder; } @Override public boolean onUnbind(Intent intent) { // All clients have unbound with unbindService() return false; } @Override public void onStart(Intent intent, int startId) { Log.i(TAG, "AudioPlayerService: onStart() called, instance=" + this.hashCode()); } @Override public void onDestroy() { Log.i(TAG, "AudioPlayerService: onDestroy() called"); releaseMediaPlayer(); } // ----- public void play(String audioFile) { Log.d(TAG, "audio play called with file " + audioFile); if (mMediaPlayer != null && audioFile.compareTo(currentDataSource) == 0) { if (mMediaPlayer.isPlaying() == true) { return; } mMediaPlayer.start(); return; } releaseMediaPlayer(); try { mMediaPlayer = new MediaPlayer(); mMediaPlayer.setDataSource(audioFile); mMediaPlayer.setOnPreparedListener(this); mMediaPlayer.setOnCompletionListener(this); currentDataSource = audioFile; mMediaPlayer.prepareAsync(); } catch (IOException ioe) { Log.e(TAG, "error trying to play " + audioFile, ioe); } } public void pause() { Log.d(TAG, "audio pause"); if (mMediaPlayer != null && mMediaPlayer.isPlaying()) { mMediaPlayer.pause(); } } public void seek(int timeInMillis) { if (mMediaPlayer != null) { mMediaPlayer.seekTo(timeInMillis); } } public int elapsed() { if (mMediaPlayer == null) { return 0; } return mMediaPlayer.getCurrentPosition(); } public void stop() { Log.d(TAG, "audio stop"); releaseMediaPlayer(); } // -- private void releaseMediaPlayer() { if (mMediaPlayer == null) { return; } if (mMediaPlayer.isPlaying()) { mMediaPlayer.stop(); } mMediaPlayer.release(); mMediaPlayer = null; } @Override public void onCompletion(MediaPlayer arg0) { // TODO Auto-generated method stub releaseMediaPlayer(); } @Override public void onPrepared(MediaPlayer mp) { if (mp != null) { mp.start(); } // TODO Auto-generated method stub } } 

 mService.unbindService(mConnection); 

 unbindService(mConnection); 

 @Override public boolean onUnbind(Intent intent) { // All clients have unbound with unbindService() releaseMediaPlayer(); return false; }