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   源码介绍

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package com.example.training21_lz;

import java.io.File;
import java.io.IOException;

import android.hardware.Camera;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity  implements Callback{
private Button btn_video_start,btn_video_stop;
private SurfaceView videoView;
private SurfaceHolder holder;
private Camera camera;//照相机
private MediaRecorder mediarecorder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_video_start=(Button) this.findViewById(R.id.btn_video_start);
        btn_video_stop=(Button) this.findViewById(R.id.btn_video_stop);
        videoView=(SurfaceView) this.findViewById(R.id.videoView);
        holder=videoView.getHolder();
        holder.addCallback(this);
        btn_video_start.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
Vdeio();
}
});
        
        btn_video_stop.setOnClickListener(new OnClickListener() {
        
        @Override
public void onClick(View v) {
        mediarecorder.stop();//结束
        mediarecorder.release();//清除缓存
        mediarecorder=null;
        camera.release();
            camera=null;
        }
    });
    }


    protected void Vdeio() {
    
    camera.release();
    camera=null;
    camera= Camera.open();
    try {
    camera.setPreviewDisplay(holder);
    } catch (IOException e) {
e.printStackTrace();

} 
camera.setDisplayOrientation(90);
camera.unlock();
String fileName=Environment.getExternalStorageDirectory() File.separator "you.mp4";
mediarecorder= new MediaRecorder();//新建多媒体录制器
mediarecorder.reset();//复位
mediarecorder.setCamera(camera); //设置摄像头为相机

mediarecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);//视频源 
mediarecorder.setAudioSource(MediaRecorder.AudioSource.MIC); // 录音源为麦克风 

mediarecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW)); //设置视频和声音的编码为系统自带的格式
mediarecorder.setOutputFile(fileName);//输出
mediarecorder.setPreviewDisplay(holder.getSurface()); // 预览
try {
mediarecorder.prepare();//准备
} catch (IOException e) {
e.printStackTrace();
}
mediarecorder.start();//开始
   }
    public void Preview(){
    camera= Camera.open();
    try {
camera.setPreviewDisplay(holder);
camera.setDisplayOrientation(90);
} catch (IOException e) {
e.printStackTrace();
}
    camera.startPreview();
    }