以GridView为例

重载GridView

实现将指定View置顶，以免放大时被其他View遮挡，其他布局也可类似实现

方案一：

package com.example.gridview;

import android.content.Context;

import android.graphics.Canvas;

import android.util.AttributeSet;

import android.util.Log;

import android.view.View;

import android.widget.GridView;

public class MyGridView extends GridView {

public MyGridView(Context context, AttributeSet attrs) {

super(context, attrs);

// TODO Auto-generated constructor stub

setChildrenDrawingOrderEnabled(true);

}

//设置要设为topView的view

public void setTopView(View v)

{

for(int i = 0; i < getChildCount(); i++)

{

if(getChildAt(i) == v)

{

postion = i;

break;

}

}

}

privateintpostion= -1;

//修改绘制顺序

@Override

protected int getChildDrawingOrder(int childCount, int i) {

// TODO Auto-generated method stub

if(childCount > 0 && postion != -1)

{

if(i== postion)

{

return childCount - 1;

}else if(i == childCount - 1)

{

returnpostion;

}else {

return i;

}

}

returni;

}

}

方案二：

重载dispatchDraw，当全部子View绘制后，再次绘制选定的View

@Override

protected void dispatchDraw(Canvas canvas) {

super.dispatchDraw(canvas);

drawChild(canvas, v, v.getDrawingTime());

}

实现将指定View置顶，以免放大时被遮挡