android 中的视频录制错误

Question

我需要将视频文件录制成 mp4 格式。但是，当我运行并单击录制按钮时，它会抛出类似 FATAL EXCEPTION: main 的错误 java.lang.IllegalStateException。这是我的全部代码

boolean recording = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_final_example);
    initUI();
    initRecorder();
    buttonStopVid.setEnabled(false);
    buttonPlayVid.setEnabled(false);
    buttonStartVid.setOnClickListener(this);

    holder = surfaceView.getHolder();
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

protected void initUI(){
    buttonStartVid = (Button) findViewById(R.id.buttonStartRecordVid);
    buttonPlayVid = (Button) findViewById(R.id.buttonPlayVid);
    buttonStopVid = (Button) findViewById(R.id.buttonStopRecordVid);
    videoView = (VideoView) findViewById(R.id.videoView);
    surfaceView = (SurfaceView) findViewById(R.id.surface_camera_final);
}

@Override
public void onClick(View v) {
    if(v.getId() == R.id.buttonStartRecordVid){
        buttonStartVid.setEnabled(false);
        buttonStopVid.setEnabled(true);

        surfaceView.setVisibility(View.VISIBLE);
        prepareRecorder();
        recording = true;
        recorder.start();

    }
    if(v.getId() == R.id.buttonStopRecordVid){
        buttonPlayVid.setEnabled(true);
        buttonStartVid.setEnabled(true);
        buttonStopVid.setEnabled(false);
        surfaceView.setVisibility(View.GONE);

        recorder.stop();
        recording = false;
        initRecorder();
        prepareRecorder();
    }
    if(v.getId() == R.id.buttonPlayVid){

    }
}

protected void initRecorder(){
    recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
    recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);

    CamcorderProfile cp = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
    recorder.setProfile(cp);

    try{
        File newFile = File.createTempFile("vid", ".mp4", Environment.getExternalStorageDirectory());
        recorder.setOutputFile(newFile.getAbsolutePath());
    }
    catch (IOException e){
        e.printStackTrace();
    }
}

private void prepareRecorder() {

    recorder.setPreviewDisplay(holder.getSurface());

    try {
        recorder.prepare();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

@Override
public void surfaceCreated(SurfaceHolder holder) {
    prepareRecorder();
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    if(recording){
        recorder.stop();
        recording = false;
    }
    recorder.release();
}

关于可能导致此问题的原因以及如何解决它的任何想法？谢谢！

Answer 1

看起来你的prepareRecorder() 函数会被调用很多次，这会导致MediaRecorder 抛出illegalState 异常。 MediaRecorder 具有您需要牢记的状态机。你需要知道你的MediaRecorder是哪个状态，然后做相应的处理。从您的异常日志中，它说 MediaRecorder 正在错误地执行错误的过程 state.I 认为 http://developer.android.com/reference/android/media/MediaRecorder.html 可能是适合您的文档。

Answer 2

使用这个link http://developer.android.com/reference/android/media/MediaRecorder.html

它将提供您需要的完整信息。

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