Android 实现iphone主屏幕文件夹展开合并效果（OpenFolder）

[java]
public class OpenFolder {

    public static String TAG = "OpenFolder";
    /**
     * folder animaltion execution time
     */
    private static int ANIMALTION_TIME = 300;

    private Context mContext;
    private WindowManager mWindowManager;
    private int mWindowLayoutType = WindowManager.LayoutParams.TYPE_APPLICATION_PANEL;

    private OpenFolderContainer container;
    private View mBackgroundView;
    private View mFolderView;
    private ImageView mTopView;
    private ImageView mBottomView;

    private int mUp_down;
    private int[] mAnchorLocation = new int[2];
    private int mSrceenwidth;
    private int mSrceenheigh;
    private int mFolderheigh;

    private int offsety;
    private int offsetyLast;
    private boolean mIsOpened = false;

    /**
     * Listener that is called when this OpenFolder window is closed.
     */
    public interface OnFolderClosedListener {
        /**
         * Called when this OpenFolder window is closed.
         */
        public void onClosed();
    }

    private OnFolderClosedListener mOnFolderClosedListener;

    /**
     * the folder open Animation Listener
     */
    private Animation.AnimationListener mOpenAnimationListener = new Animation.AnimationListener() {

        @Override
        public void onAnimationStart(Animation animation) {
        }

        @Override
        public void onAnimationRepeat(Animation animation) {
        }

        @Override
        public void onAnimationEnd(Animation animation) {
            mIsOpened = true;
        }
    };

    /**
     * the folder colse Animation Listener
     */
    private Animation.AnimationListener mClosedAnimationListener = new Animation.AnimationListener() {

        @Override
        public void onAnimationStart(Animation animation) {
        }

        @Override
        public void onAnimationRepeat(Animation animation) {
        }

        @Override
        public void onAnimationEnd(Animation animation) {
            mWindowManager.removeView(container);
            // 清空画图缓存区，否则获取的还是原来的图像
            mBackgroundView.setDrawingCacheEnabled(false);
            mIsOpened = false;
            if (mOnFolderClosedListener != null) {
                mOnFolderClosedListener.onClosed();
            }
        }
    };

    private static OpenFolder openFolder;

    /**
     * @param context
     * @return
     */
    public static OpenFolder getInstance(Context context) {
        if (openFolder == null) {
            openFolder = new OpenFolder(context);
        }
        return openFolder;
    }

    private OpenFolder(Context context) {

        mContext = context;
        mWindowManager = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        container = new OpenFolderContainer(mContext);
    }

    /**
     *
     * @param anchor
     *            folder展开参照容器
     * @param backgroundView
     *            当前用于显示folder的页面
     * @param folderView
     *            folder页面
     * @param folderH
     *            folder页面高度，dip
     * @param up_down
     *            0 为向上展开，否则向下展开
     */
    public void openFolderView(View anchor, View backgroundView,
            View folderView, int folderH, int up_down) {
        mUp_down = up_down;
        container.removeAllViews();
        mBackgroundView = backgroundView;
        mFolderheigh = dip2px(mContext, folderH);
        mFolderView = folderView;

补充：移动开发 , Android ,