android之相机 VideoSource和AudioSource

public class MediaRecoderActivity extends AppCompatActivity {    private SurfaceView sv_recoder;    private MediaRecorder mediaRecorder;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_media_recoder);        sv_recoder = (SurfaceView) findViewById(R.id.sv_recoder);        //实例化媒体录制器        mediaRecorder = new MediaRecorder();    }    public  void  start(View view){        mediaRecorder.reset();        //设置视频和音频来源        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);        //设置输出格式        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);        //设置每秒几栈        mediaRecorder.setVideoFrameRate(3);        //音频和视频的编码格式        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);        //保存路径        try {            mediaRecorder.setOutputFile("/mnt/sdcard/G150725_"+System.currentTimeMillis()+".mp4");            mediaRecorder.setPreviewDisplay(sv_recoder.getHolder().getSurface());            mediaRecorder.prepare();            mediaRecorder.start();        } catch (IOException e) {            e.printStackTrace();        }    }}

<LinearLayout     >    <SurfaceView        android:layout_width="match_parent"        android:layout_height="400dp"        android:id="@+id/sv_recoder"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="开始"        android:onClick="start"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="停止"        android:onClick="stop"        />LinearLayout>

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