用媒体记录器录制视频

问题描述

| 我正在使用Media Recorder编写视频录制功能的代码。，但是它抛出Io异常，非法状态异常，我在Google中搜索了很多次，但是对此代码没有适当的解释，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(),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();
        }
    });

}

}     

解决方法

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