MediaRecorder在start（）崩溃

Question

我试图长时间拍摄视频。

以下是初始化媒体记录器的代码。

export default class SomeCard extends React.Component {
  constructor(){
    super();

    this.state = {
      data_source: []
    }
  }

  componentDidMount(){
    const {name, data} = this.props.data;
    if(name == 'AAA'){
      let values_a = data.map((tmp_data) =>{
        let date = new Date(tmp_data.date);
        return {
          x: date,
          open: tmp_data.open,
          high: tmp_data.high,
          low: tmp_data.low,
          close: tmp_data.close
        };
      });
      let final_tmp_data = [
        {
          name: name,
          values: values_a
        }
      ];
      console.log(final_tmp_data);  //NOT EMPTY
      this.setState({data_source: final_tmp_data});
      console.log(data_source);     //NOT EMPTY
    }else if(name == 'BBB'){
      let values_b = data.map((tmp_data) => {
        let date = new Date(tmp_data.date);
        let tmp_date = date.getFullYear();
        return {
          "x": String(tmp_date),
          "y": tmp_data.value
        };
      });
      let final_cash_data = [
        {
          "name": name,
          "values": values_b
        }
      ];
      console.log(final_cash_data);          //NOT EMPTY
      this.setState({data_source: final_cash_data});
      console.log(this.state.data_source);   //EMPTY!!!!!!!!
    }
  .....
}

此方法从onSurfaceCreated方法调用，如下所示：

private void initRecorder(Surface surface) {
    if (camera == null) {
        camera = Camera.open();
        camera.unlock();
    }

    if (mediaRecorder == null)
        mediaRecorder = new MediaRecorder();

    mediaRecorder.setPreviewDisplay(surface);
    mediaRecorder.setCamera(camera);


    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);

    File file_image = getDirectory();

    if (!file_image.exists() && !file_image.mkdirs()) {
        Toast.makeText(CameraActivity.this, "Cannot Create Directory", Toast.LENGTH_SHORT).show();
        return;
    }

    SimpleDateFormat sdf = new SimpleDateFormat("yyyymmddhhmmss");
    String date = sdf.format(new Date());
    String photoFile = "GIFVideo" + date + ".mp4";
    String file_name = file_image.getAbsolutePath() + "/" + photoFile;
    File picFile = new File(file_name);

    mediaRecorder.setOutputFile(file_name);

    // No limit. Don't forget to check the space on disk.
    mediaRecorder.setMaxDuration(-1);
    mediaRecorder.setVideoFrameRate(15);

    mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);

    try {
        mediaRecorder.prepare();
    } catch (IllegalStateException e) {
        // This is thrown if the previous calls are not called with the 
        // proper order
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    initSuccess = true;


}

给我错误的代码是：

 @Override
public void surfaceCreated(SurfaceHolder holder) {
    //Open Camera
    try {
        camera = Camera.open();
    } catch (RuntimeException e) {
        e.printStackTrace();
    }
    if (!initSuccess) {
        initRecorder(holder.getSurface());
    }

    setCameraParameters("back");
    try {

        //Camera Started, tell where to draw
        camera.setPreviewDisplay(surfaceHolder);


        camera.startPreview();

    } catch (Exception e) {
        e.printStackTrace();
    }

}

以下是我遇到的错误：

btnCapture.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            if (!recording) {
                mediaRecorder.start();
                Toast.makeText(CameraActivity.this, "Video Recording Started", Toast.LENGTH_SHORT).show();
                recording = true;

            }
            return false;
        }
    });