的Android按下按鈕，長時間播放聲音

Question

我剛剛完成播放聲音時，按下按鈕

，但我有一個短促的聲音，如「蜂鳴聲」，這小於1秒

我怎麼能按下按鈕播放聲音，直到扣上？

bt = (Button)findViewById(R.id.clickme); 
    final MediaPlayer mp = MediaPlayer.create(this, R.raw.beep); 
    bt.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      mp.start(); 
     } 
    }); 

Answer 1

您可以使用下面的代碼：

bt.setOnTouchListener(this); 

@Override 
public boolean onTouch(View arg0, MotionEvent event) { 

    switch (event.getAction()) { 
    case MotionEvent.ACTION_DOWN: 
     System.out.println("touch"); 
     mp.setLooping(true); 
     mp.start(); 
     break; 
    case MotionEvent.ACTION_UP: 
     System.out.println("up"); 
     mp.pause(); 
     break; 
    } 

    return true; 
} 

我做了一些研究，發現Android的Mediaplayer有彈無間斷的聲音，而循環的問題..

看到這個：Gapless Playback with android MediaPlayer

我也發現幾個解決方案：

1. 使用OGG格式的聲音文件（https://en.wikipedia.org/wiki/.ogg）
2. 可以使用的Soundpool它有一個循環和緩存設備的媒體播放（https://developer.android.com/reference/android/media/SoundPool.html）

你也可以使用以下類別：看看它是否工作..

public class LoopMediaPlayer { 

    public static final String TAG = LoopMediaPlayer.class.getSimpleName(); 

    private Context mContext = null; 
    private int mResId = 0; 
    private int mCounter = 1; 

    private MediaPlayer mCurrentPlayer = null; 
    private MediaPlayer mNextPlayer = null; 

    public static LoopMediaPlayer create(Context context, int resId) { 
     return new LoopMediaPlayer(context, resId); 
    } 

    private LoopMediaPlayer(Context context, int resId) { 
     mContext = context; 
     mResId = resId; 

     mCurrentPlayer = MediaPlayer.create(mContext, mResId); 
     mCurrentPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { 
      @Override 
      public void onPrepared(MediaPlayer mediaPlayer) { 
       mCurrentPlayer.start(); 
      } 
     }); 

     createNextMediaPlayer(); 
    } 

    private void createNextMediaPlayer() { 
     mNextPlayer = MediaPlayer.create(mContext, mResId); 
     mCurrentPlayer.setNextMediaPlayer(mNextPlayer); 
     mCurrentPlayer.setOnCompletionListener(onCompletionListener); 
    } 

    private MediaPlayer.OnCompletionListener onCompletionListener = new MediaPlayer.OnCompletionListener() { 
     @Override 
     public void onCompletion(MediaPlayer mediaPlayer) { 
      mediaPlayer.release(); 
      mCurrentPlayer = mNextPlayer; 

      createNextMediaPlayer(); 

      Log.d(TAG, String.format("Loop #%d", ++mCounter)); 
     } 
    }; 
} 

t Ø使用它只需調用mp.setLooping(true);

Answer 2

使用OnTouchListener

bt.setOnTouchListener(new View.OnTouchListener() {   
@Override 
public boolean onTouch(View v, MotionEvent event) { 
    switch(event.getAction()) { 
     case MotionEvent.ACTION_DOWN: // Button Pressed  
      mp.reset(); 
      mp.setDataSource(mediapath); 
      mp.prepare(); 
      mp.start();   

      return true; 
     case MotionEvent.ACTION_UP:// Button released 
      mp.stop(); 
      return true; 
    } 
    return false; 
} 
});