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   源码介绍

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package com.example.videorecorddemo;

import java.io.IOException;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import android.hardware.Camera;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.Environment;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

/**
 * 录像线程
 * 
 * @author bcaiw
 * 
 */
public class RecordThread extends Thread {
	private String TAG = "RecordThread";
	
	private MediaRecorder mediarecorder;// 录制视频的类
	private SurfaceHolder surfaceHolder;
	private long recordTime;
	private SurfaceView surfaceview;// 显示视频的控件
	private Camera mCamera;

	public RecordThread(long recordTime, SurfaceView surfaceview,
			SurfaceHolder surfaceHolder) {
		Log.i(TAG, "RecordThread");
		
		this.recordTime = recordTime;
		this.surfaceview = surfaceview;
		this.surfaceHolder = surfaceHolder;
	}

	@Override
	public void run() {
		Log.i(TAG, "run()");
		
		/**
		 * 开始录像
		 */
		startRecord();

		/**
		 * 启动定时器，到规定时间recordTime后执行停止录像任务
		 */
		Timer timer = new Timer();

		timer.schedule(new TimerThread(), recordTime);
	}

	/**
	 * 获取摄像头实例对象，可以选在前置或者后置摄像头
	 * 
	 * @return
	 */
	private Camera getCameraInstance(boolean facingfront) {
		int facing;
		Camera cam = null;
		Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
		
		if(facingfront)
			facing = Camera.CameraInfo.CAMERA_FACING_FRONT;
		else
			facing = Camera.CameraInfo.CAMERA_FACING_BACK;
		
		for (int camIdx = 0, cameraCount = Camera.getNumberOfCameras(); camIdx < cameraCount; camIdx  ) {
			Camera.getCameraInfo(camIdx, cameraInfo);
			if (cameraInfo.facing == facing) {
				try {
					cam = Camera.open(camIdx);
					break;
				} catch (RuntimeException e) {
					e.printStackTrace();
				}
			}
		}

		return cam;
	}

	/**
	 * 开始录像
	 */
	public void startRecord() {
		Log.i(TAG, "startRecord()");

		mediarecorder = new MediaRecorder();// 创建mediarecorder对象
		mCamera = getCameraInstance(true);

		// 解锁camera
		mCamera.unlock();
		mediarecorder.setCamera(mCamera);
		
		// 设置录制视频源为Camera(相机)
		mediarecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
		mediarecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
		// 设置录制文件质量，格式，分辨率之类，这个全部包括了
		mediarecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW));
		mediarecorder.setPreviewDisplay(surfaceHolder.getSurface());
		// 设置视频文件输出的路径
		String filePath = Environment.getExternalStorageDirectory()   "/SilentRecordService/Media/VideRecordDemo.mp4";
		Log.i(TAG, "startRecord(), filePath: "   filePath);
		mediarecorder.setOutputFile(filePath);
		
/*
        mediarecorder = new MediaRecorder();// 创建mediarecorder对象  
        // 设置录制音频源为Mic
        mediarecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        // 设置录制视频源为Camera(相机)
        mediarecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        // 设置录制完成后视频的封装格式THREE_GPP为3gp，MPEG_4为mp4
        mediarecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        // 
        //mediarecorder.setAudioSamplingRate(DEFAULT_SAMPLING_RATE);
        // 
        //mediarecorder.setAudioChannels(AudioFormat.CHANNEL_IN_MONO);
        // 设置录制的音频编码
        mediarecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        // 设置录制的视频编码h263 h264
        mediarecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);  
        // 设置视频录制的分辨率。必须放在设置编码和格式的后面，否则报错  
        mediarecorder.setVideoSize(176, 144);  
        // 设置录制的视频帧率。必须放在设置编码和格式的后面，否则报错  
        mediarecorder.setVideoFrameRate(15);
        mediarecorder.setPreviewDisplay(surfaceHolder.getSurface());
        // 设置视频文件输出的路径  
        mediarecorder.setOutputFile(Environment.getExternalStorageDirectory()   "/SilentRecordService/Media/VideRecordDemo.mp4");
		*/
		try {
			// 准备录制
			Log.i(TAG, "mediarecorder.prepare()");
			mediarecorder.prepare();
			// 开始录制
			Log.i(TAG, "mediarecorder.start()");
			mediarecorder.start();
		} catch (IllegalStateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	/**
	 * 停止录制
	 */
	public void stopRecord() {
		Log.i(TAG, "stopRecord()");
		
		if (mediarecorder != null) {
			// 停止录制
			mediarecorder.stop();
			// 释放资源
			mediarecorder.release();
			mediarecorder = null;

			if (mCamera != null) {
				mCamera.release();
				mCamera = null;
			}
		}
	}

	/**
	 * 定时器
	 * 
	 * @author bcaiw
	 * 
	 */
	class TimerThread extends TimerTask {
		
		/**
		 * 停止录像
		 */
		@Override
		public void run() {
			Log.i(TAG, "TimerThread, run()");
			
			stopRecord();
			this.cancel();
		}
	}
}