android .reset(),Android MediaPlayer.reset()正在调用onCompletion

我遇到以下代码的问题.我在MediaController上调用了setPrevNextListener,并为Prev和Next定义了两个onClickListener.当我单击下一个按钮而不是前进一个轨道时,我前进两个轨道.这似乎是由于onCompletion被某种方式调用的事实. MediaPlayer.reset()是否会调用onCompletion？我已经包含了logcat输出和我的代码.如果我做错了,请告诉我.提前致谢.

logcat的：

02-24 00:36:34.826: D/MP(6675): Next Button Clicked,index was: 0

02-24 00:36:34.837: D/MP(6675): About to call Reset()

02-24 00:36:34.906: D/MP(6675): Inside setUpPlayer

02-24 00:36:34.917: D/MP(6675): Called setDataSource with index: 1

02-24 00:36:34.917: D/MP(6675): Leaving setUpPlayer

02-24 00:36:34.917: D/MP(6675): About to call prepareAsync()

02-24 00:36:34.937: D/MP(6675): Leaving next button

02-24 00:36:35.226: E/MediaPlayer(6675): Attempt to call getDuration without a valid mediaplayer

02-24 00:36:35.226: E/MediaPlayer(6675): error (-38,0)

02-24 00:36:35.276: E/MediaPlayer(6675): Error (-38,0)

02-24 00:36:35.287: D/MP(6675): Inside onCompletion

02-24 00:36:35.337: D/MP(6675): About to call Reset()

02-24 00:36:35.347: D/MP(6675): Inside setUpPlayer

02-24 00:36:35.356: D/MP(6675): Called setDataSource with index: 2

02-24 00:36:35.356: D/MP(6675): Leaving setUpPlayer

02-24 00:36:35.356: D/MP(6675): About to call prepareAsync()

02-24 00:36:35.377: D/MP(6675): Leaving onCompletion

02-24 00:36:36.517: D/MP(6675): Inside onPrepared,index is: 2

02-24 00:36:36.577: D/MP(6675): Leaving onPrepared

码：

public class MusicPlayerActivity extends Activity implements OnPreparedListener,OnCompletionListener,MediaController.MediaPlayerControl {

private MediaPlayer mp;

private MediaController mc;

private SonarDatabase db;

private SubsonicAPIConnector sonic;

ArrayList songs;

int index = 0;

private Handler handler = new Handler();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.music_player);

// Get params from intent

Intent i = getIntent();

String albumId = i.getStringExtra("albumId");

String artistId = i.getStringExtra("artistId");

String albumName = i.getStringExtra("albumName");

String songName = i.getStringExtra("songName");

String songId = i.getStringExtra("songId");

String coverArt = "al-"+albumId+".jpeg";

String duration = i.getStringExtra("duration");

Log.d("MP","results: albumName:" + albumName + ",songName: " + songName + ",songId: "

+ songId + ",duration: " + duration + ",coverArt: " + coverArt + ",artistId: "

+ artistId + ",albumId: " + albumId);

db = new SonarDatabase(getApplicationContext());

sonic = new SubsonicAPIConnector(db.getURL(),db.getUsername(),db.getPassword());

String artistName = db.getArtistNameById(artistId);

setTitle("Now Playing");

songs = db.getSongListForAlbum(albumId);

index = songs.indexOf(songId);

Log.d("MP","songid: " + songId + ",index: " + index);

// Update text views with song information

TextView txtArtist = (TextView) findViewById(R.id.txtArtistName);

txtArtist.setText(artistName);

TextView txtAlbum = (TextView) findViewById(R.id.txtAlbumName);

txtAlbum.setText(albumName);

TextView txtSong = (TextView) findViewById(R.id.txtSongName);

txtSong.setText(songName);

// Show the album art

File img = new File(this.getFilesDir()+"/covers/"+coverArt);

if(img.exists()) {

Log.d("MP","Found image at: " + img.toString());

ImageView imgView = (ImageView) findViewById(R.id.cover_art);

imgView.setImageBitmap(BitmapFactory.decodeFile(img.getPath()));

} else {

Log.d("MP","Couldn't find image: " + img.toString());

}

// Create the media player and controller

mp = new MediaPlayer();

mp.setOnPreparedListener(this);

mp.setOnCompletionListener(this);

mc = new NonHidingMediaController(this);

mc.setPrevNextListeners(new View.OnClickListener() {

@Override

public void onClick(View v) {

// next button clicked

Log.d("MP","Next Button Clicked,index was: " + index);

playNextTrack();

Log.d("MP","Leaving next button");

}

},new View.OnClickListener() {

@Override

public void onClick(View v) {

// prevIoUs button clicked

Log.d("MP","PrevIoUs button clicked,index was: " + index);

if(mp.isPlaying() && mp.getCurrentPosition() < 2000 && index != 0) {

Log.d("MP","Start the prior song.");

playPrevIoUsTrack();

} else {

Log.d("MP","Restart this song.");

restartCurrentTrack();

}

Log.d("MP","Leaving prevIoUs button");

}

});

mc.setMediaPlayer(this);

setUpPlayer();

Log.d("MP","About to call prepareAsync()");

mp.prepareAsync();

}

@Override

public void onCompletion(MediaPlayer mp) {

Log.d("MP","Inside onCompletion");

//TODO add code for scrobbling here.

playNextTrack();

Log.d("MP","Leaving onCompletion");

}

private void playNextTrack() {

index++;

TextView txtSong = (TextView) findViewById(R.id.txtSongName);

txtSong.setText(db.getSongNameById(songs.get(index)));

Log.d("MP","About to call Reset()");

mp.reset();

setUpPlayer();

Log.d("MP","About to call prepareAsync()");

mp.prepareAsync();

}

private void playPrevIoUsTrack() {

index--;

TextView txtSong = (TextView) findViewById(R.id.txtSongName);

txtSong.setText(db.getSongNameById(songs.get(index)));

Log.d("MP","About to call prepareAsync()");

mp.prepareAsync();

}

private void restartCurrentTrack() {

mp.seekTo(0);

}

public void onPrepared(MediaPlayer mp) {

Log.d("MP","Inside onPrepared,index is: " + index);

mc.setMediaPlayer(this);

mc.setAnchorView(findViewById(R.id.music_player_view));

mp.start();

handler.post(new Runnable() {

public void run() {

mc.setEnabled(true);

mc.show();

}

});

Log.d("MP","Leaving onPrepared");

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.activity_music_player,menu);

return true;

}

@Override

public boolean onTouchEvent(MotionEvent event) {

Log.d("MP","OnTouchEvent called");

mc.show();

return false;

}

private void setUpPlayer() {

Log.d("MP","Inside setUpPlayer");

mp.setAudioStreamType(AudioManager.STREAM_MUSIC);

try {

mp.setDataSource(sonic.streamString("&id=" + songs.get(index)));

Log.d("MP","Called setDataSource with index: " + index);

} catch (IllegalArgumentException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (SecurityException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IllegalStateException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Log.d("MP","Leaving setUpPlayer");

}

@Override

protected void onStop() {

super.onStop();

mc.hide();

mp.stop();

mp.release();

}

public void start() {

mp.start();

}

public void pause() {

mp.pause();

}

public int getDuration() {

return mp.getDuration();

}

public int getCurrentPosition() {

return mp.getCurrentPosition();

}

public void seekTo(int i) {

mp.seekTo(i);

}

public boolean isPlaying() {

return mp.isPlaying();

}

public int getBufferPercentage() {

return 0;

}

public boolean canPause() {

return true;

}

public boolean canSeekBackward() {

return true;

}

public boolean canSeekForward() {

return true;

}

public class NonHidingMediaController extends MediaController {

public NonHidingMediaController(Context context,AttributeSet attrs) {

super(context,attrs);

}

public NonHidingMediaController(Context context,boolean useFastForward) {

super(context,useFastForward);

}

public NonHidingMediaController(Context context) {

super(context);

}

@Override

public void show(int timeout) {

super.show(0);

}

}

}