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   源码介绍

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package com.recode;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.ImageFormat;
import android.hardware.Camera;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.SurfaceHolder.Callback;
import android.view.View.OnClickListener;
import android.widget.Button;

public class CameraVideo extends Activity implements Callback {
	private Button statRecode;// 开始 录像
	private Button stopRecode;// 停止 录像
	private SurfaceView mySurfaceView;// surfaceView声明
	private SurfaceHolder holder;// surfaceHolder声明
	private Camera myCamera;// 相机声明
	private MediaRecorder mediaRecorder;
	private boolean record;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);// 无标题
		setContentView(R.layout.camera_layout);
		statRecode = (Button) findViewById(R.id.c_recode);
		stopRecode = (Button) findViewById(R.id.c_stop);
		mySurfaceView = (SurfaceView) findViewById(R.id.surfaceView1);

		// 获得holder
		holder = mySurfaceView.getHolder();
		// 添加回调
		holder.addCallback(this);

		// 开始
		statRecode.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				
				//按下“停止”按钮后将“开始”按钮设置为可以点击
				statRecode.setClickable(false);
				statRecode.setText("正在录制");
				statRecode.setTextColor(Color.RED);
				
				// 关闭预览并释放资源
				myCamera.stopPreview();
				myCamera.release();
				myCamera = null;
				if (mediaRecorder == null) {
					mediaRecorder = new MediaRecorder();
				}

				mediaRecorder.reset();
				// 从照相机采集视频
				mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
				// 设置音频资源采集方式
				mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);

				// 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);

				// 设置视频录制的分辨率。 引用android.util.DisplayMetrics 获取分辨率
				DisplayMetrics dm = new DisplayMetrics();
				getWindowManager().getDefaultDisplay().getMetrics(dm);
				// mediaRecorder.setVideoSize(dm.widthPixels, dm.heightPixels);

				mediaRecorder.setVideoFrameRate(15); // 设置录制的视频帧率。 每秒15帧

				mediaRecorder
						.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); // 设置视频编码方式
				mediaRecorder
						.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); // 设置音频编码方式

				// 用时间来给录的视频命名
				String fileName = new SimpleDateFormat("yyyyMMddHHmmss")
						.format(new Date());
				
				// 保存路径
				String path = Environment.getExternalStorageDirectory()
						.toString()   "/"   fileName   ".mp4"; 
				
				mediaRecorder.setOutputFile(path);// 设置保存路径

				mediaRecorder.setPreviewDisplay(holder.getSurface());
				try {
					mediaRecorder.prepare();// 预期准备
				} catch (Exception e) {
					e.printStackTrace();
				}
				mediaRecorder.start();// 开始刻录
				record = true;
			}
		});
		// 停止
		stopRecode.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				
				//按下“停止”按钮后将“开始”按钮设置为可以点击
				statRecode.setClickable(true);
				statRecode.setText("开始录制");
				statRecode.setTextColor(Color.BLACK);
				
				if (record) {
					mediaRecorder.stop();
					mediaRecorder.release();
					mediaRecorder = null;

					record = false;

					// 开启相机
					if (myCamera == null) {
						myCamera = Camera.open();
						try {
							myCamera.setPreviewDisplay(holder);
						} catch (IOException e) {
							e.printStackTrace();
						}
					}
					Camera.Parameters params = myCamera.getParameters();
					params.setPictureFormat(ImageFormat.JPEG);
					
					myCamera.setParameters(params);
					myCamera.startPreview(); // 开启预览

				}

			}
		});

	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		
		// 设置参数并开始预览
		Camera.Parameters params = myCamera.getParameters();
		params.setPictureFormat(ImageFormat.JPEG);

		myCamera.setParameters(params);
		myCamera.startPreview();

	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		Log.i("gao", "surfaceCreated");
		// 开启相机
		if (myCamera == null) {
			myCamera = Camera.open();
			try {
				myCamera.setPreviewDisplay(holder);
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		// TODO Auto-generated method stub

		// 关闭预览并释放资源
		if (myCamera != null) {
			myCamera.stopPreview();
			myCamera.release();
			myCamera = null;
		}
		if (mediaRecorder != null) {
			mediaRecorder.release();
			mediaRecorder = null;
		}

	}


}