mainActivity如下:
package c.c;
import java.io.File;
import java.io.IOException;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.hardware.Camera;
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,较上一版增加了预览功能.
*
* 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.
*
* 说明:
* 从Android录制视频(五)到Android录制视频(一)难度
* 逐渐上升也渐渐趋于完善.
*
*/
public class MainActivity extends Activity implements SurfaceHolder.Callback{
private Button mStartButton;
private Button mStopButton;
private Camera mCamera;
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();
mMediaRecorder.setCamera(mCamera);
//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) {
//mCamera.lock();
mCamera.stopPreview();
mMediaRecorder.stop();
mMediaRecorder.release();
mMediaRecorder=null;
}
}
}
}
//SurfaceHolder.Callback接口
public void surfaceCreated(SurfaceHolder holder) {
System.out.println("SurfaceView---->Created");
try {
mCamera=Camera.open();
mCamera.setPreviewDisplay(mSurfaceHolder);
mCamera.startPreview();
mCamera.unlock();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
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>
