媒体录音机记录应用程序音频

我有一个应用程序，有几个按钮，有声音（soundPool）我需要将它们写在闪存卡上我通过MediaRecorder，但是当我运行该应用程序，然后打开记录播放和点击停止录制应用程序崩溃你不告诉我什么问题是？我预计，在方法recordStop媒体录音机记录应用程序音频

public class MainActivity extends Activity { 


    int kickSound; 
    SoundPool mSoundPool; 
    AssetManager assets; 

    private MediaRecorder mediaRecorder; 
    private MediaPlayer mediaPlayer; 
    private String fileName; 

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

    mSoundPool = new SoundPool(3, AudioManager.STREAM_MUSIC, 0); 
    assets = getAssets(); 

    kickSound = loadSound("snare_trap.ogg"); 

    ImageButton kick = (ImageButton)this.findViewById(R.id.imageButton1); 
    kick.setOnTouchListener(new View.OnTouchListener() { 

     @Override 
     public boolean onTouch(View v, MotionEvent event) { 
      if (event.getAction() == MotionEvent.ACTION_DOWN){ 
       playSound(kickSound); 
      } 
      return false; 
     } 
    }); 


    fileName = Environment.getExternalStorageDirectory() + "/record.3gpp"; 
    } 

    protected void playSound(int sound) { 

     if (sound > 0) 
      mSoundPool.play(sound, 1, 1, 1, 0, 1); 
     } 


     private int loadSound(String fileName) { 
      AssetFileDescriptor afd = null; 
      try { 
       afd = assets.openFd(fileName); 
      } catch (IOException e) { 
       e.printStackTrace(); 
       Toast.makeText(this, "Couldn't load file '" + fileName + "'", Toast.LENGTH_SHORT).show(); 
       return -1; 
      } 
      return mSoundPool.load(afd, 1); 
      } 


    public void recordStart(View v) { 
    try { 
     releaseRecorder(); 

     File outFile = new File(fileName); 
     if (outFile.exists()) { 
     outFile.delete(); 
     } 

     mediaRecorder = new MediaRecorder(); 
     mediaRecorder.setAudioSource(AudioManager.STREAM_MUSIC); 
     mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 
     mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 
     mediaRecorder.setOutputFile(fileName); 
     mediaRecorder.prepare(); 
     mediaRecorder.start(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 

    } 

    public void recordStop(View v) { 
     mediaRecorder.stop(); 
    } 


    public void playStart(View v) { 
    try { 
     releasePlayer(); 
     mediaPlayer = new MediaPlayer(); 
     mediaPlayer.setDataSource(fileName); 
     mediaPlayer.prepare(); 
     mediaPlayer.start(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
    } 

    public void playStop(View v) { 
    if (mediaPlayer != null) { 
     mediaPlayer.stop(); 
    } 
    } 

    private void releaseRecorder() { 
    if (mediaRecorder != null) { 
     mediaRecorder.release(); 
     mediaRecorder = null; 
    } 
    } 

    private void releasePlayer() { 

     mediaPlayer.release(); 
     mediaPlayer = null; 
    } 


    @Override 
    protected void onDestroy() { 
    super.onDestroy(); 
    releasePlayer(); 
    releaseRecorder(); 
    } 

}

来源

2013-10-06 user2851135

你为什么要释放录音机下手了呢？只有在您不再需要访问录像机时才能使用释放。试着将发布版本移到最后。

来源

2014-01-30 19:08:40 user3002469

媒体录音机记录应用程序音频

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