/**
	 * 根據座標獲取相對應的子控制元件<br>
	 * 在Activity使用
	 * 
	 * @param x座標
	 * @param y座標
	 * @return 目標View
	 */
	public View getViewAtActivity(int x, int y) {
		// 從Activity裡獲取容器
		View root = getWindow().getDecorView();
		return findViewByXY(root, x, y);
	}

	/**
	 * 根據座標獲取相對應的子控制元件<br>
	 * 在重寫ViewGroup使用
	 * 
	 * @param x座標
	 * @param y座標
	 * @return 目標View
	 */
	public View getViewAtViewGroup(int x, int y) {
		return findViewByXY(this, x, y);
	}

	private View findViewByXY(View view, int x, int y) {
		View targetView = null;
		if (view instanceof ViewGroup) {
			// 父容器,遍歷子控制元件
			ViewGroup v = (ViewGroup) view;
			for (int i = 0; i < v.getChildCount(); i++) {
				targetView = findViewByXY(v.getChildAt(i), x, y);
				if (targetView != null) {
					break;
				}
			}
		} else {
			targetView = getTouchTarget(view, x, y);
		}
		return targetView;

	}

	private View getTouchTarget(View view, int x, int y) {
		View targetView = null;
		// 判斷view是否可以聚焦
		ArrayList<View> TouchableViews = view.getTouchables();
		for (View child : TouchableViews) {
			if (isTouchPointInView(child, x, y)) {
				targetView = child;
				break;
			}
		}
		return targetView;
	}

	private boolean isTouchPointInView(View view, int x, int y) {
		int[] location = new int[2];
		view.getLocationOnScreen(location);
		int left = location[0];
		int top = location[1];
		int right = left + view.getMeasuredWidth();
		int bottom = top + view.getMeasuredHeight();
		if (view.isClickable() && y >= top && y <= bottom && x >= left
				&& x <= right) {
			return true;
		}
		return false;
	}