Android Camera（二）

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(){

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            // TODO Auto-generated method stub
            Log.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);
            }
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub
            Log.d(TAG, "onStartTrackingTouch");
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub
            Log.d(TAG, "onStartTrackingTouch");
        }

       });
    }



    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.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
         */
        @Override
        public 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.CameraInfo
                camera = 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 block
                e.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."+sizewidth+"	size.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(){

                @Override
                public 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;
        }

        @Override
        public 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
         */
        @Override
        public 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，crash
                camera.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