android 中如何扩大按钮的可点击范围

 

final ImageView close = (ImageView) view.findViewById(R.id.close);

        View parent = view.findViewById(R.id.rl_title);

        parent.post(new Runnable() {

            @Override

            public void run() {

                Rect delegateArea = new Rect();

                ImageView delegate = close;

                delegate.getHitRect(delegateArea);

                // 扩大触摸区域矩阵值

                delegateArea.left -= 50;

                delegateArea.top -= 50;

                delegateArea.right += 50;

                delegateArea.bottom += 50;

                TouchDelegate expandedArea = new TouchDelegate(delegateArea, delegate);

                if(View.class.isInstance(delegate.getParent())){

                    // 设置视图扩大后的触摸区域

                    ((View)delegate.getParent()).setTouchDelegate(expandedArea);

                }

            }

        });