Question

我正在使用Media recorder编写视频录制功能的代码。但是它会抛出Io Exception，非法状态异常我在谷歌搜索了很多次但没有正确解释这个我的代码是

public class Simple extends Activity {
    /** Called when the activity is first created. */
    Button button,button2;
    MediaRecorder recorder;
    Camera camera;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button=(Button) findViewById(R.id.button1);
        button2=(Button) findViewById(R.id.button2);

    camera=Camera.open();
    Camera.Parameters params = camera.getParameters();
    camera.setParameters(params);


    button.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub

            Toast.makeText(getBaseContext(), "Video Start", Toast.LENGTH_LONG).show();

            String mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
            mFileName += "/temp.3mp4";

            recorder=new MediaRecorder();


            recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
            recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            recorder.setVideoFrameRate(10);
            recorder.setVideoSize(200, 300);
            recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
            recorder.setMaxDuration(50000);
            recorder.setMaxFileSize(5000000);
            recorder.setOutputFile(mFileName);
            try {
                recorder.prepare();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                Toast.makeText(getBaseContext(),e.toString(), Toast.LENGTH_LONG).show();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                Toast.makeText(getBaseContext(),e.toString(), Toast.LENGTH_LONG).show();
            }
            }
    });

    button2.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(getBaseContext(), "Video Stop", Toast.LENGTH_LONG).show();
            recorder.stop();
        }
    });

}

}

Answer 1

以下是录制视频的代码......

recorder = new MediaRecorder();
        recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
        mPreview = new Preview(VideoRecorder.this,recorder);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        setContentView(mPreview);

recorder.start();

这是预览类....

class Preview extends SurfaceView implements SurfaceHolder.Callback
{
    SurfaceHolder mHolder;
    MediaRecorder tempRecorder;
    public Preview(Context context,MediaRecorder recorder) {
        super(context);
        tempRecorder=recorder;
        mHolder=getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        // TODO Auto-generated constructor stub
    }

    public Surface getSurface()
    {
        return mHolder.getSurface();
    }

    public void surfaceCreated(SurfaceHolder holder){
        tempRecorder.setOutputFile("/sdcard/recordvideooutput.3gpp");
        tempRecorder.setPreviewDisplay(mHolder.getSurface());
        try{
            tempRecorder.prepare();
        } catch (Exception e) {
            String message = e.getMessage();
            tempRecorder.release();
            tempRecorder = null;
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) 
    {
        if(tempRecorder!=null)
        {
            tempRecorder.release();
            tempRecorder = null;
        }
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) 
    {

    }
}

使用媒体记录器录制视频

1 个答案: