实例教程十四：视频刻录（调用前置摄像头）

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<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >       <!-- 父界面 -->       <SurfaceView         android:id="@+id/sfvShow"        android:layout_width="fill_parent"        android:layout_height="fill_parent" />       <!-- 子界面 -->       <RelativeLayout         android:id="@+id/btnLayout"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:visibility="gone" >           <Button             android:id="@+id/btnRecord"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentBottom="true"            android:layout_alignParentRight="true"            android:layout_marginRight="5dp"            android:onClick="record"            android:text="@string/btnRecord" />           <Button             android:enabled="false"            android:id="@+id/btnStop"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignTop="@id/btnRecord"            android:layout_marginRight="20dp"            android:layout_toLeftOf="@id/btnRecord"            android:onClick="record"            android:text="@string/btnStop" />     </RelativeLayout>   </FrameLayout>

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.itcast.recorder"    android:versionCode="1"    android:versionName="1.0" >       <uses-sdk android:minSdkVersion="8" />       <application         android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >         <activity             android:name=".MainActivity"            android:label="@string/app_name"            android:screenOrientation="landscape" >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                   <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>     </application>           <uses-permission android:name="android.permission.RECORD_AUDIO"/>     <uses-permission android:name="android.permission.CAMERA" />     <!-- 在SDCard中创建与删除文件权限 -->     <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />     <!-- 在SDCard中写入数据权限 -->     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />   </manifest>

package cn.itcast.recorder;   import java.io.File;   import android.app.Activity; import android.hardware.Camera; import android.media.MediaRecorder; import android.os.Bundle; import android.os.Environment; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.Button; import android.widget.RelativeLayout; import android.hardware.Camera.Parameters;   public class MainActivity extends Activity {         private SurfaceView sfvShow;         private RelativeLayout btnLayout;         private Button btnRecord;         private Button btnStop;         private MediaRecorder mediaRecorder;           private Camera camera = null;                 private Camera.CameraInfo cameraInfo;         private int cameraCount = 0;           @Override        public void onCreate(Bundle savedInstanceState) {                 super.onCreate(savedInstanceState);                   requestWindowFeature(Window.FEATURE_NO_TITLE); //设置窗口无标题                 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,                                  WindowManager.LayoutParams.FLAG_FULLSCREEN); //设置全屏                 setContentView(R.layout.main);                   initView();         }           private void initView(){                 btnRecord = (Button)this.findViewById(R.id.btnRecord);                 btnStop = (Button)this.findViewById(R.id.btnStop);                   btnLayout = (RelativeLayout)this.findViewById(R.id.btnLayout);                 sfvShow = (SurfaceView)this.findViewById(R.id.sfvShow);                   sfvShow.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);                 sfvShow.getHolder().setFixedSize(176, 144);                 sfvShow.getHolder().setKeepScreenOn(true); //使摄像头一直保持高亮         }           //触摸屏幕事件         @Override        public boolean onTouchEvent(MotionEvent event) {                 if(event.getAction() == MotionEvent.ACTION_DOWN){                         btnLayout.setVisibility(View.VISIBLE);                 }                 return super.onTouchEvent(event);         }           public void record(View v){                 switch(v.getId()){                 case R.id.btnRecord:                         try{                                 initCamera(); //调用前置摄像头--注意，要在MediaRecorder设置参数之前就调用unlock来获得camera的控制权。camera是单例的嘛。如果不调用，程序就挂                                 File videofile = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".3gp");                                 mediaRecorder = new MediaRecorder();                                 mediaRecorder.setCamera(camera); //如果需要前置摄像头，则加上，反之，这句话不需要存在                                 //设置声音从哪个设备获取                                 mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);                                 //设置画面从哪个设备获取                                 mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);                                 //设置输入的格式                                 mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);                                 //设置视频大小                                 mediaRecorder.setVideoSize(320, 240);                                 //设置每秒获取几帧，5帧比较清晰                                 mediaRecorder.setVideoFrameRate(5);                                 //设置音频编码格式                                 mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);                                 //设置视频编码格式                                 mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);                                 //设置文件存放位置                                 mediaRecorder.setOutputFile(videofile.getAbsolutePath());                                 //显示画面                                 mediaRecorder.setPreviewDisplay(sfvShow.getHolder().getSurface()); //预览输入                                 //缓冲                                 mediaRecorder.prepare();                                 //开始刻录                                 mediaRecorder.start();                         }catch(Exception e){                                 e.printStackTrace();                         }                         btnRecord.setEnabled(false);                         btnStop.setEnabled(true);                           break;                 case R.id.btnStop:                         if(mediaRecorder != null){                                 //停止记录                                 mediaRecorder.stop();                                 //释放该对象                                 mediaRecorder.release();                         }                           btnRecord.setEnabled(true);                         btnStop.setEnabled(false);                         break;                 default:                         break;                 }         }           private void initCamera(){                 Camera.CameraInfo cameraInfo = new Camera.CameraInfo();                   cameraCount = Camera.getNumberOfCameras(); // get cameras number                     for ( int camIdx = 0; camIdx < cameraCount;camIdx++ ) {                           Camera.getCameraInfo( camIdx, cameraInfo ); // get camerainfo                           if ( cameraInfo.facing ==Camera.CameraInfo.CAMERA_FACING_FRONT ) {                                  // 代表摄像头的方位，目前有定义值两个分别为CAMERA_FACING_FRONT前置和CAMERA_FACING_BACK后置                                   try {                                                       camera = Camera.open(camIdx);                                   } catch (RuntimeException e) {                                           e.printStackTrace();                                   }                           }                 }                 camera.unlock();         } }

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调用的前置摄像头，照的是天花板