@Override

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        //获取SingleTouchView所在父布局的中心点

        ViewGroup mViewGroup = (ViewGroup) getParent();

        if(null != mViewGroup){

            mParentWidth = mViewGroup.getWidth();

            mParentHeight = mViewGroup.getHeight();

        }

    }