实例教程十四：视频刻录（调用前置摄像头）

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------------帖子正文---------------------

<?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(); 
        } 
}

2012-10-10 15:27 上传

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调用的前置摄像头，照的是天花板