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(); 

        } 

}

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