SurfaceView显示Camera摄像（之二设置参数、变焦）

上次已经写过SurfaceView显示Camera摄像了，代码可以运行，但是里面有问题，这次纠正过来，顺便实现变焦：

代码：

public class CameravedioActivity extends Activity{private static final String TAG = "CameravedioActivity";private Camera camera;     private boolean preview  = false ;    private SeekBar mSeekBar;    private SurfaceView surfaceView;    private SurfaceHolder surfaceHolder;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);               /*        *设置窗口属性：一定要在 setContentView(R.layout.main) 之前        */// 窗口标题,其实可以在manifes文件里面注册//     requestWindowFeature(Window.FEATURE_NO_TITLE);// 全屏        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);       setContentView(R.layout.main);       surfaceView =  (SurfaceView) findViewById(R.id.surfaceView);       surfaceHolder = surfaceView.getHolder();       surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);       surfaceView.getHolder().setFixedSize(200, 200);       surfaceView.getHolder().addCallback(new SurfaceViewCallback());              /**        * seekbar 用来实现变焦逻辑        */       mSeekBar = (SeekBar)findViewById(R.id.seekbar);       mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stubLog.d(TAG, "progress:"+progress);//sdk 文档描述 set zoom 之前先check if(camera.getParameters().isZoomSupported()){Parameters params = camera.getParameters();params.setZoom(progress);camera.setParameters(params);}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubLog.d(TAG, "onStartTrackingTouch");}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubLog.d(TAG, "onStartTrackingTouch");}              });    }                @Overrideprotected void onResume() {// TODO Auto-generated method stubsuper.onResume();}public static void setCameraDisplayOrientation(Activity activity,            int cameraId, android.hardware.Camera camera) {        android.hardware.Camera.CameraInfo info =                new android.hardware.Camera.CameraInfo();        android.hardware.Camera.getCameraInfo(cameraId, info);        int rotation = activity.getWindowManager().getDefaultDisplay()                .getRotation();        int degrees = 0;        Log.d(TAG, "rotation:"+rotation);        switch (rotation) {            case Surface.ROTATION_0: degrees = 0; break;            case Surface.ROTATION_90: degrees = 90; break;            case Surface.ROTATION_180: degrees = 180; break;            case Surface.ROTATION_270: degrees = 270; break;        }        int result;        if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {            result = (info.orientation + degrees) % 360;            result = (360 - result) % 360;  // compensate the mirror        } else {  // back-facing            result = (info.orientation - degrees + 360) % 360;        }        camera.setDisplayOrientation(result);    }private final class SurfaceViewCallback implements Callback {/** * surfaceView 被创建成功后调用此方法 */@Overridepublic void surfaceCreated(SurfaceHolder holder) {Log.d(TAG,"surfaceCreated");/*  * 在SurfaceView创建好之后 打开摄像头 * 注意是 android.hardware.Camera *///2.2获取摄像头number physical cameras //api 9: Camera.getNumberOfCameras()Log.d(TAG, "numbers:"+Camera.getNumberOfCameras());if(Camera.getNumberOfCameras() ==2){//前置摄像头//api 9 :Camera.CameraInfocamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);camera.setDisplayOrientation(90);}else{camera = Camera.open();}//camera = Camera.open();//setCameraDisplayOrientation(CameravedioActivity.this,Camera.CameraInfo.CAMERA_FACING_FRONT,camera);Log.d(TAG, "smoothZoom:"+camera.getParameters().isSmoothZoomSupported());Log.d(TAG, "supportzoom:"+camera.getParameters().isZoomSupported());Log.d(TAG, "max zoom:"+camera.getParameters().getMaxZoom());/* * This method must be called before startPreview(). otherwise surfaceview没有图像 */try {camera.setPreviewDisplay(surfaceHolder);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}Camera.Parameters parameters = camera.getParameters();/* 每秒从摄像头捕获5帧画面， */parameters.setPreviewFrameRate(5);/* 设置照片的输出格式:jpg */parameters.setPictureFormat(PixelFormat.JPEG);/* 照片质量 */parameters.set("jpeg-quality", 85);mSeekBar.setMax(parameters.getMaxZoom());//valid parameters:// 取得相机所支持多少图片大小的个数List<Size> pszize = parameters.getSupportedPreviewSizes();//List<Size> pszize = parameters.getSupportedPictureSizes();            if (null != pszize && 0 < pszize.size()) {                    int height[] = new int[pszize.size()];// 声明一个数组                    Map<Integer, Integer> map = new HashMap<Integer, Integer>();                    for (int i = 0; i < pszize.size(); i++) {                            Size size = (Size) pszize.get(i);                            int sizeheight = size.height;                            int sizewidth = size.width;                            height[i] = sizeheight;                            map.put(sizeheight, sizewidth);                            Log.d(TAG, "size.width:"+sizewidth+"\tsize.height:"+sizeheight);                    }                    Arrays.sort(height);                 // 设置//                    parameters.setPictureSize(map.get(height[0]),height[0]);        parameters.setPreviewSize(map.get(height[0]),height[0]);                      }/* 将参数对象赋予到 camera 对象上 */camera.setParameters(parameters);camera.startPreview();/** * Installs a callback to be invoked for every preview frame in addition to displaying them on the screen.  * The callback will be repeatedly called for as long as preview is active. This method can be called at  * any time, even while preview is live. Any other preview callbacks are overridden. * a callback object that receives a copy of each preview frame, or null to stop receiving  */camera.setPreviewCallback(new Camera.PreviewCallback(){@Overridepublic void onPreviewFrame(byte[] data, Camera camera) {// TODO Auto-generated method stub    //在视频聊天中，这里传送本地frame数据给remote端//Log.d(TAG, "camera:"+camera);//Log.d(TAG, "byte:"+data);}});preview = true;}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {Log.d(TAG,"surfaceChanged");}/** * SurfaceView 被销毁时释放掉 摄像头 */@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {if(camera != null) {/* 若摄像头正在工作，先停止它 */if(preview) {camera.stopPreview();preview = false;}//如果注册了此回调，在release之前调用，否则release之后还回调，crashcamera.setPreviewCallback(null);camera.release();}}}}

注册文件：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="cn.edu.wtu"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon" android:label="@string/app_name">    <!-- android:screenOrientation="landscape" 表示横向界面 -->        <activity android:name=".CameravedioActivity" android:label="@string/app_name"  android:screenOrientation="portrait">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>    <uses-sdk android:minSdkVersion="7" />    <!-- 在SDCard中创建与删除文件权限 --><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/><!-- 往SDCard写入数据权限 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <!-- 申请使用摄像头的权限 --><uses-permission android:name="android.permission.CAMERA"/></manifest>

布局文件：

<?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">    <LinearLayout    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    ><SurfaceView android:id="@+id/surfaceView"    android:layout_width="200dip"     android:layout_height="150dip"    android:layout_gravity="center"     android:visibility="visible"    />    <LinearLayout    android:layout_width="fill_parent"    android:layout_height="wrap_content"    >    <SeekBar    android:id="@+id/seekbar"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_marginLeft="40dip"    android:layout_marginRight="40dip"    android:layout_gravity="center"    android:progressDrawable="@android:color/transparent"    android:background="@drawable/progressbar_box"    />    </LinearLayout>    </LinearLayout></FrameLayout>

seekbar用来实现调焦的