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>