Android录制视频(二)

mainActivit如下:

package c.c;import java.io.File;import java.io.IOException;import android.app.Activity;import android.content.pm.ActivityInfo;import android.media.MediaRecorder;import android.media.MediaRecorder.OnInfoListener;import android.os.Bundle;import android.os.Environment;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.view.WindowManager;import android.widget.Button;/** * Demo描述: * 利用SurfaceView拍摄视频 *  * 注意: * 1 严重注意:MediaRecorder参数的设置.因手机不同而有差异 * 2 在设置MediaRecorder的参数时,应先设置: *   setVideoSource(),setAudioSource(),setOutputFormat(),setVideoEncoder(),setAudioEncoder *   然后再设置其余的参数,查看方法对应的API有提示 * 3 错误:mMediaRecorder.setVideoFrameRate(20); *   改正:mMediaRecorder.setVideoFrameRate(15); *   现象:在2.3上正常,4.0上报错 *   原因:每秒12-15帧之间足以表示运动,电视是30. * */public class MainActivity extends Activity implements SurfaceHolder.Callback{private Button mStartButton;private Button mStopButton;private SurfaceView mSurfaceView;private SurfaceHolder mSurfaceHolder;private MediaRecorder mMediaRecorder;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // 去掉标题栏        requestWindowFeature(Window.FEATURE_NO_TITLE);        // 设置全屏getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);// 设置横屏显示setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);        setContentView(R.layout.main);        init();    }    private void init(){    mStartButton=(Button) findViewById(R.id.start_button);    mStartButton.setOnClickListener(new ButtonClickListenerImpl());    mStopButton=(Button) findViewById(R.id.stop_button);    mStopButton.setOnClickListener(new ButtonClickListenerImpl());    mSurfaceView=(SurfaceView) findViewById(R.id.surfaceView);    mSurfaceHolder=mSurfaceView.getHolder();    mSurfaceHolder.addCallback(this);    mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);    }    private void initMediaRecorder(){    //next codes is right for 2.3 and 4.0    mMediaRecorder=new MediaRecorder();    //设置视频源    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);    //设置音频源    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);    //设置文件输出格式    mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);    //设置视频编码方式    mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);    //设置音频编码方式    mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);    //设置视频高和宽,注意文档的说明:    //Must be called after setVideoSource().    //Call this after setOutFormat() but before prepare().    //设置录制的视频帧率,注意文档的说明:    //Must be called after setVideoSource().    //Call this after setOutFormat() but before prepare().    mMediaRecorder.setVideoFrameRate(15);    //设置预览画面    mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());    //设置输出路径    mMediaRecorder.setOutputFile    (Environment.getExternalStorageDirectory()+File.separator+System.currentTimeMillis()+".mp4");    mMediaRecorder.setVideoSize(800, 480);    //设置视频的最大持续时间    mMediaRecorder.setMaxDuration(10000);    //为MediaRecorder设置监听    mMediaRecorder.setOnInfoListener(new OnInfoListener() {public void onInfo(MediaRecorder mr, int what, int extra) {if (what==MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED) {System.out.println("已经达到最长录制时间");if (mMediaRecorder!=null) {mMediaRecorder.stop();mMediaRecorder.release();mMediaRecorder=null;}}}});    }        private class ButtonClickListenerImpl implements OnClickListener{public void onClick(View v) {if (v.getId()==R.id.start_button) {try {initMediaRecorder();mMediaRecorder.prepare();mMediaRecorder.start();} catch (IllegalStateException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}} if (v.getId()==R.id.stop_button) {if (mMediaRecorder!=null) {mMediaRecorder.stop();mMediaRecorder.release();mMediaRecorder=null;}}}    }    //SurfaceHolder.Callback接口public void surfaceCreated(SurfaceHolder holder) {        System.out.println("SurfaceView---->Created");}public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {System.out.println("SurfaceView---->Changed");}public void surfaceDestroyed(SurfaceHolder holder) {System.out.println("SurfaceView---->Destroyed");if (mMediaRecorder!=null) {mMediaRecorder.stop();mMediaRecorder.release();mMediaRecorder=null;}}        }

 

main.xml如下

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <SurfaceView        android:id="@+id/surfaceView"        android:layout_width="fill_parent"        android:layout_height="0dip"        android:layout_weight="1" />    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <Button            android:id="@+id/start_button"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:text="开始"            android:layout_weight="1" />        <Button            android:id="@+id/stop_button"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:text="停止"            android:layout_weight="1" />    </LinearLayout></LinearLayout>