Android 3D 图片画廊实现

1.扩展Gallery：
public class GalleryFlow extends Gallery {
    private Camera mCamera = new Camera();//相机类
    private int mMaxRotationAngle = 60;//最大转动角度
    private int mMaxZoom = -300;////最大缩放值
    private int mCoveflowCenter;//半径值
    public GalleryFlow(Context context) {
        super(context);
        //支持转换 ,执行getChildStaticTransformation方法
        this.setStaticTransformationsEnabled(true);
    }
    public GalleryFlow(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.setStaticTransformationsEnabled(true);
    }
    public GalleryFlow(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        this.setStaticTransformationsEnabled(true);
    }
    public int getMaxRotationAngle() {
        return mMaxRotationAngle;
    }
    public void setMaxRotationAngle(int maxRotationAngle) {
        mMaxRotationAngle = maxRotationAngle;
    }
    public int getMaxZoom() {
        return mMaxZoom;
    }
    public void setMaxZoom(int maxZoom) {
        mMaxZoom = maxZoom;

    }
    private int getCenterOfCoverflow() {
        return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2
                        + getPaddingLeft();
    }
    private static int getCenterOfView(View view) {
        System.out.println("view left :"+view.getLeft());
        System.out.println("view width :"+view.getWidth());
        return view.getLeft() + view.getWidth() / 2;
    }
    
    
   //控制gallery中每个图片的旋转(重写的gallery中方法)
    protected boolean getChildStaticTransformation(View child, Transformation t) {  
        //取得当前子view的半径值
        final int childCenter = getCenterOfView(child);
        System.out.println("childCenter："+childCenter);
        final int childWidth = child.getWidth();
        //旋转角度
        int rotationAngle = 0;
        //重置转换状态
        t.clear();
        //设置转换类型
        t.setTransformationType(Transformation.TYPE_MATRIX);
        //如果图片位于中心位置不需要进行旋转
        if (childCenter == mCoveflowCenter) {
            transformImageBitmap((ImageView) child, t, 0);
        } else {
            //根据图片在gallery中的位置来计算图片的旋转角度
            rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);