单击按钮开始录制/停止录制时，MediaRecorder 总是崩溃

Question

我有一个按钮来控制开始录制和停止录制。首先当前不录制，开始录制。如果当前录制，停止录制，然后将文件意图到下一个活动。但是现在开始录制工作正常，但是当停止录制时，应用程序崩溃显示以下错误：

java.lang.RuntimeException: 停止失败.at android.media.MediaRecorder.stop(本机方法)

有时，点击停止录制时它没有崩溃，但是当我回到这个视频录制活动时，它再次崩溃，也显示同样的错误。

这是我实现按钮的方式。有关更多信息，我的记录器是prepare() in surfaceCreated()。

boolean isRecording = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    videoButton.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
      if(isRecording){
        stopRecording();
      }else{
        startRecording(); 
      }
   }
}
private void startRecording() {
    Log.d("Video","start recording");
    isRecording = true;
    mRecorder.start();
}

private void stopRecording() {
   Log.d("Video","stop recording");
   isRecording = false;

if (null != recorder) {  
  try{     
      mRecorder.stop();
      mRecorder.reset();
      mRecorder.release();
      }
  catch(RuntimeException ex){
       //Ignore
       }
}    
  }      

所以我的问题是如何制作一个按钮来正确控制开始和停止录制过程？关于信息，我没有兴趣使用ToggleButton，我需要一个普通按钮。

提前致谢。

编辑： 我在RuntimeExeception 到mRecorder.start 和mRecorder.stop 如下所示，但是应用程序在第三次单击按钮时仍然崩溃（当重新开始录制时）。

private void startRecording() {
        Log.d("Video","start recording");
        isRecording = true;
        try {
            mRecorder.start();
        }catch (RuntimeException e){
            e.printStackTrace();
        }
    }

    private void stopRecording() {
        Log.d("Video","stop recording");
        isRecording = false;

        if(mRecorder != null) {
            try {
                mRecorder.stop();
                mRecorder.reset();
                mRecorder.release();
            }catch (RuntimeException e){
                e.printStackTrace();
            }

        }

    }

这是我在应用崩溃时得到的堆栈跟踪：

    10-19 16:59:03.605 1671-3096/? W/ActivityManager: Spurious death for ProcessRecord{c3a33c7 0:com.ssapp/u0a71}, curProc for 18644: null
10-19 16:59:03.610 1671-1692/? W/WindowManager: Attempted to add application window with unknown token Token{465cf6e ActivityRecord{88a76e9 u0 com.ch.ssapp/.chat.activity.ChatActivity t446 f}}.  Aborting.
10-19 16:59:03.610 1671-1692/? W/WindowManager: Token{465cf6e ActivityRecord{88a76e9 u0 /.chat.activity.ChatActivity t446 f}} already running, starting window not displayed. Unable to add window -- token Token{465cf6e ActivityRecord{88a76e9 u0 /.chat.activity.ChatActivity t446 f}} is not valid; is your activity running?
10-19 16:59:03.610 1671-1692/? W/WindowManager: view not successfully added to wm, removing view
10-19 16:59:03.610 1671-1692/? W/WindowManager: Exception when adding starting window
                                                java.lang.IllegalArgumentException: View=com.android.internal.policy.PhoneWindow$DecorView{aab303e V.E...... R.....ID 0,0-0,0} not attached to window manager
                                                    at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:424)
                                                    at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:350)
                                                    at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:116)
                                                    at com.android.server.policy.PhoneWindowManager.addStartingWindow(PhoneWindowManager.java:2359)
                                                    at com.android.server.wm.WindowManagerService$H.handleMessage(WindowManagerService.java:7840)
                                                    at android.os.Handler.dispatchMessage(Handler.java:102)
                                                    at android.os.Looper.loop(Looper.java:148)
                                                    at android.os.HandlerThread.run(HandlerThread.java:61)
                                                    at com.android.server.ServiceThread.run(ServiceThread.java:46)

Answer 1

我发现问题是，停止录制时我没有释放Camera和MediaRecorder。所以我在下面解决了这个问题，希望可以帮助其他人：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    videoButton.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
      if(isRecording){
        stopRecording();
      }else{
        startRecording(); 
      }
   }
}

private void startRecording() {
        Log.d("Video","start recording");
        mCamera = Camera.open();
        if(prepareRecorder()){
            mRecorder.start();
            isRecording = true;
        }else{
            if (mRecorder != null) {
        // clear recorder configuration
        mRecorder.reset();

        mRecorder.release();
        mRecorder = null;

        mCamera.lock();
    }
        }
}

private void stopRecording() {
        Log.d("Video","stop recording");
        try{
            mRecorder.stop();
        }catch (RuntimeException e) {
            // RuntimeException is thrown when stop() is called immediately after start().
            // In this case the output file is not properly constructed ans should be deleted.
            Log.d(TAG, "RuntimeException: stop() is called immediately after start()");
        }

        if (mRecorder != null) {
        // clear recorder configuration
         mRecorder.reset();

         mRecorder.release();
         mRecorder = null;

         mCamera.lock();
        }

        mCamera.lock();
        isRecording = false;
        releaseCamera();

}