怎么在android开发之调用手机的摄像头使用MediaRecorder录像并播放

mediarecorder = new MediaRecorder();// 创建mediarecorder对象
// 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.THREE_GPP);
// 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(20);
mediarecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());
// 设置视频文件输出的路径
lastFileName = newFileName();
mediarecorder.setOutputFile(lastFileName);
try {
// 准备录制
mediarecorder.prepare();
// 开始录制
mediarecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
结束拍摄：
if (mediarecorder != null) {
// 停止
mediarecorder.stop();
mediarecorder.release();
mediarecorder = null;
}

package zyf.demo.moviedemo;
import java.io.File;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
import android.media.MediaRecorder;
import android.view.SurfaceView;
public class MovieRecorder {
private MediaRecorder mediarecorder;
boolean isRecording;
public void startRecording(SurfaceView surfaceView) {
mediarecorder = new MediaRecorder();// 创建mediarecorder对象
// 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.THREE_GPP);
// 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(20);
mediarecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());
// 设置视频文件输出的路径
lastFileName = newFileName();
mediarecorder.setOutputFile(lastFileName);
try {
// 准备录制
mediarecorder.prepare();
// 开始录制
mediarecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
isRecording = true;
timeSize = 0;
timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
timeSize++;
}
}, 0,1000);
}
Timer timer;
int timeSize = 0;
private String lastFileName;
public void stopRecording() {
if (mediarecorder != null) {
// 停止
mediarecorder.stop();
mediarecorder.release();
mediarecorder = null;
timer.cancel();
if (null != lastFileName && !"".equals(lastFileName)) {
File f = new File(lastFileName);
String name = f.getName().substring(0,
f.getName().lastIndexOf(".3gp"));
name += "_" + timeSize + "s.3gp";
String newPath = f.getParentFile().getAbsolutePath() + "/"
+ name;
if (f.renameTo(new File(newPath))) {
int i = 0;
i++;
}
}
}
}
public String newFileName() {
try {
return File.createTempFile("/mov_", ".3gp").getAbsolutePath();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}
public void release() {
if (mediarecorder != null) {
// 停止
mediarecorder.stop();
mediarecorder.release();
mediarecorder = null;
}
} }

public void play(String fileName, SurfaceView view) {
mPlayer = new MediaPlayer();
mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mPlayer.setDisplay(view.getHolder()); // 定义一个SurfaceView播放它
mPlayer.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer arg0) {
stop();
// canvas.drawColor(Color.TRANSPARENT,
// PorterDuff.Mode.CLEAR);
}
});
try {
mPlayer.setDataSource(fileName);
mPlayer.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mPlayer.start();
}
结束播放时：
public void stop() {
if (mPlayer != null) {
mPlayer.release();
mPlayer = null;
}
}