Android M - MediaRecorder 启动失败答案

【问题标题】：Android M - MediaRecorder start failedAndroid M - MediaRecorder 启动失败
【发布时间】：2016-06-06 07:04:32
【问题描述】：

Samsung Galaxy S6 edge 6.0.1 运行良好，所以 Android M 可能不是这里的因素。

首先，Android 6.0+ 权限被授予，所以不是这样的。

这里是：

    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
        //нужно проверять пермишны
        if (ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.CAMERA)
        != PackageManager.PERMISSION_GRANTED || 
        ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.RECORD_AUDIO)
        != PackageManager.PERMISSION_GRANTED ||
        ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.READ_EXTERNAL_STORAGE)
        != PackageManager.PERMISSION_GRANTED ||
        ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE)
        != PackageManager.PERMISSION_GRANTED ||
        ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.ACCESS_NETWORK_STATE)
        != PackageManager.PERMISSION_GRANTED ||
        ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.INTERNET)
        != PackageManager.PERMISSION_GRANTED) {


                ActivityCompat.requestPermissions(MainActivity.this,
                   new String[]{Manifest.permission.CAMERA,Manifest.permission.RECORD_AUDIO,Manifest.permission.INTERNET,Manifest.permission.ACCESS_NETWORK_STATE,Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},
                        PERMISSIONS_REQUEST);           

        }
    }

我已经在其他设备上测试了我的应用程序，它运行良好，但在 Nexus 5（锤头）上，当调用 MediaRecorder.start() 时出现错误，我不知道该怎么做.

堆栈跟踪很简单：

java.lang.RuntimeException: start failed.
    at android.media.MediaRecorder.start(Native Method)
    at com.vladdrummer.headsup.ScreenVideoRecorder.record(ScreenVideoRecorder.java:94)

所以，没有太多的信息。这是代码，但请记住，它适用在其他设备上

private  Camera camera;
...
 camera.setPreviewDisplay(holder);
                  camera.startPreview();
                  isPrepared = prepareVideoRecorder();
..
    private boolean prepareVideoRecorder() {
        try{

        camera.unlock();

        mediaRecorder = new MediaRecorder();

        mediaRecorder.setCamera(camera);
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mediaRecorder.setProfile(CamcorderProfile
            .get(CamcorderProfile.QUALITY_HIGH));
        String path = A.getRawGameVideoPath();//4 debug purposes
        mediaRecorder.setOutputFile(path);
        mediaRecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());
        }
        catch (Exception e){
            e.printStackTrace();
            return false;
        }
        try {
          mediaRecorder.prepare();
        } catch (Exception e) {
          e.printStackTrace();
          release();
          return false;
        }
        return true;
      }

      public void record(){
          if (isPrepared){        
          mediaRecorder.start(); // Here where it crashes on Android M
          }
      }

当然，它也可能在其他设备上崩溃，我只在 3 台设备上测试过

【问题讨论】：

标签： android mediarecorder android-mediarecorder

【解决方案1】：

对于 android M 您需要添加运行时权限，例如 Camera,Audio 试试这个可能对你有帮助

private static final int MY_PERMISSIONS_REQUEST = 11;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (mContext.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO},
            MY_PERMISSIONS_REQUEST);
} else {
    Log.d("TAG", "Already granted access");
    initializeView(v);
}
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
switch (requestCode) {
    case MY_PERMISSIONS_REQUEST: {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            Log.d("TAG", "Permission Granted");
            initializeView(v);
        } else {
            Log.d("TAG", "Permission Failed");
            Toast.makeText(getActivity().getBaseContext(), "You must allow permission record audio to your mobile device.", Toast.LENGTH_SHORT).show();
            getActivity().finish();
        }
    }
    // Add additional cases for other permissions you may have asked for
}
  }

【讨论】：

对不起，不是这样，我已经在运行时授予了该权限

【解决方案2】：

试试这个：

if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.CAMERA)
    != PackageManager.PERMISSION_GRANTED || 
    ContextCompat.checkSelfPermission(this,
            Manifest.permission.RECORD_AUDIO)
    != PackageManager.PERMISSION_GRANTED ||
    ContextCompat.checkSelfPermission(this,
            Manifest.permission.READ_EXTERNAL_STORAGE)
    != PackageManager.PERMISSION_GRANTED ||
    ContextCompat.checkSelfPermission(this,
            Manifest.permission.WRITE_EXTERNAL_STORAGE)
    != PackageManager.PERMISSION_GRANTED ||
    ContextCompat.checkSelfPermission(this,
            Manifest.permission.ACCESS_NETWORK_STATE)
    != PackageManager.PERMISSION_GRANTED ||
    ContextCompat.checkSelfPermission(this,
            Manifest.permission.INTERNET)
    != PackageManager.PERMISSION_GRANTED) {

            ActivityCompat.requestPermissions(this,
               new String[]{Manifest.permission.CAMERA,Manifest.permission.RECORD_AUDIO,Manifest.permission.INTERNET,Manifest.permission.ACCESS_NETWORK_STATE,Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    0);
    }
}

【讨论】：