媒体录制器录制应用程序音频

Question

我有一个应用程序，有几个按钮，有声音(soundPool)，我需要写在闪存卡上，我通过MediaRecorder，但当我运行这个应用程序，然后打开录音播放，并单击停止录制应用程序崩溃你不告诉我是什么问题？我希望在recordStop方法中

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();
  }

}

Answer 1

为什么你一开始就放了录音机？仅当您不想再访问录像机时，才应使用释放。尝试将释放移动到最后。