Mediastoreの "ok"ボタンをクリックしても選択した音楽を再生できません

Question

このアプリケーションでは、デフォルトの音楽を再生できますが、MediaStoreを使用して再生する別の音楽を選択しようとすると、 mediastoreのページでは、選択した音楽をうまく再生することができますが、「ok」ボタンをクリックして自分の選択を確定すると、もう音楽を再生できません。なぜこのようなことが起こったのか分かりません。私はあなたの助けを喜んでいます！

次は、次は私がオンラインこの問題を検索し、私はすでにmediaPlayer.prepareAsync（）とonPrepared（MediaPlayerのを）使用したが、logcat

05-16 16:42:04.243 14390-14390/com.example.a12086.app_sensor E/MediaPlayer: pause called in state 1, mPlayer(0x0) 
05-16 16:42:04.244 14390-14390/com.example.a12086.app_sensor E/MediaPlayer: error (-38, 0) 

あるコード

public class MUSIC extends AppCompatActivity implements SensorEventListener,MediaPlayer.OnPreparedListener,GoogleApiClient.ConnectionCallbacks,GoogleApiClient.OnConnectionFailedListener,LocationListener { 
    private Button JoggingButton,BikingButton; 
    private SensorManager mSensormanager; 
    private Sensor accelerometer; 
    private final float NOISE = (float) 2.0; 
    private boolean initialization; 
    private float mLastX, mLastY, mLastZ; 
    private static final String TAG = "sensor"; 
    private MediaPlayer mediaPlayer1; 
    private MediaPlayer mediaPlayer2; 
    private double measurement; 
    private double speed; 
    private boolean jogging=false,biking=false; 
    private Uri urijogging,uribiking; 
    private LocationManager locationManager; 
    private GoogleApiClient googleApiClient; 
    private LocationRequest locationRequest; 
    private final static int MY_PERMISSION_REQUEST_FINE=100; 
    private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST=9000; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_music); 

     mediaPlayer1 = new MediaPlayer(); 
     mediaPlayer2 = new MediaPlayer(); 


     JoggingButton=(Button)findViewById(R.id.button3); 
     BikingButton=(Button)findViewById(R.id.button4); 

     if(accelerometer!=null){ 
      if(urijogging==null){ 
       Prepareplay(mediaPlayer1,Uri.parse("android.resource://"+getPackageName()+ "/raw/jogging1")); 
      }else{ 
       Prepareplay(mediaPlayer1,urijogging); 
      } 
      if(uribiking==null){ 
       Prepareplay(mediaPlayer2,Uri.parse("android.resource://"+getPackageName()+ "/raw/biking1")); 
      }else{ 
       Prepareplay(mediaPlayer2,uribiking); 
      } 
      mediaPlayer1.start(); 
      mediaPlayer2.start(); 

      JoggingButton.setOnClickListener(new View.OnClickListener() { 
       public void onClick(View v) { 
        mediaPlayer1.release(); 
        mediaPlayer1=new MediaPlayer(); 
        Intent intent=new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI); 
        startActivityForResult(intent, 10); 
       } 
      }); 
      BikingButton.setOnClickListener(new View.OnClickListener() { 
       public void onClick(View v) { 
        mediaPlayer2.release(); 
        mediaPlayer2=new MediaPlayer(); 
        Intent intent=new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI); 
        startActivityForResult(intent, 11); 
       } 
      }); 
      Toast.makeText(getApplicationContext(), "Current speed:"+String.valueOf(speed),Toast.LENGTH_LONG).show(); 
     }else{ 
      Toast.makeText(getApplicationContext(),"Sorry,there are no accelerometers on your device",Toast.LENGTH_LONG).show(); 
     } 


    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if(resultCode == RESULT_OK && requestCode == 10){ 
      urijogging=data.getData(); 
      Toast.makeText(getApplicationContext(),String.valueOf(urijogging),Toast.LENGTH_LONG).show(); 
      Joggingplay(this,urijogging); 
     } 
     if(resultCode == RESULT_OK && requestCode == 11){ 
      uribiking=data.getData(); 
      Toast.makeText(getApplicationContext(),String.valueOf(uribiking),Toast.LENGTH_LONG).show(); 
      Bikingplay(this,uribiking); 
     } 
    } 
    private void Joggingplay(Context context, Uri uri) { 
     try { 
      mediaPlayer1.setDataSource(context, uri); 
      mediaPlayer1.setOnPreparedListener(this); 
      mediaPlayer1.prepareAsync(); 
      onPrepared(mediaPlayer1); 
      mediaPlayer1.start(); 

     } 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) { 
      e.printStackTrace(); 
     } 
    } 
    private void Bikingplay(Context context, Uri uri) { 
     try { 
      mediaPlayer2.setDataSource(context, uri); 
      mediaPlayer2.setOnPreparedListener(this); 
      mediaPlayer2.prepareAsync(); 
      onPrepared(mediaPlayer2); 
      mediaPlayer2.start(); 

     } 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) { 
      e.printStackTrace(); 
     } 
    } 
    @Override 
    public void onPrepared(MediaPlayer mediaPlayer) { 
     mediaPlayer.start(); 
     mediaPlayer.pause(); 
    } 


    public void Prepareplay(MediaPlayer player, Uri uri){ 
     player.setAudioStreamType(AudioManager.STREAM_MUSIC); 
     try { 
      player.setDataSource(getApplicationContext(), uri); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     try { 
      player.prepare(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 
} 

ですそれでも動作しません。選択した音楽はMediaStoreページでしか再生できません。私はそのことについて混乱しています...

Answer 1

try to Use: mdiaPlayer.reset(); 
     mdiaPlayer.prepare(); 
     mdiaPlayer.start(); instead of 
     mediaPlayer.setOnPreparedListener(this); 
     mediaPlayer.prepareAsync(); 
     onPrepared(mediaPlayer); 
     mediaPlayer.start();