LisView、GridView、RecyclerView的高度wrap_content

1、问题：想通过LisView和GridView的wrap_content实现自适应大小。

解决办法：自定义View继承自GridView或者ListView，然后重写他们的方法：onMeasure。
- 核心代码如下：

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int expandHeightMeasureSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
    super.onMeasure(widthMeasureSpec, expandHeightMeasureSpec);
}

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2、recyclerView的wrap_content

• 方法一：recyclerView的wrap_content属性已经在23.2版本得到解决，因此只需在gradle文件中加入：
  compile ‘com.android.support:recyclerview-v7:23.2.1’ 代码即可

• 方法二：自定义LayoutManager，复写OnMeasure方法，如下：

@Override  
    public void onMeasure(Recycler recycler, State state, int widthSpec,int heightSpec) {  
        View view = recycler.getViewForPosition(0);  
        if(view != null){  
            measureChild(view, widthSpec, heightSpec);  
            int measuredWidth = MeasureSpec.getSize(widthSpec);  
            int measuredHeight = view.getMeasuredHeight();  
            setMeasuredDimension(measuredWidth, measuredHeight);  
        }  
    }