GridView 和ListView中自适应高度

android中GridView  和ListView放在scrollView中时会默认的只有一行高这时就要我们自己计算出它的高度啦

首先是listview的

    //动态设置listview的高度
    public void setListViewHeightBasedOnChildren(ListView listView) {     
        // 获取ListView对应的Adapter     
        ListAdapter listAdapter = listView.getAdapter();  
        if (listAdapter == null) { 
            return; 
        } 
        int totalHeight = 0; 
        for (int i = 0; i < listAdapter.getCount(); i++) { 
            View listItem = listAdapter.getView(i, null, listView); 
            listItem.measure(0, 0); 
            totalHeight += listItem.getMeasuredHeight(); 
        } 
        ViewGroup.LayoutParams params = listView.getLayoutParams(); 
        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount()-1)); 
        ((MarginLayoutParams)params).setMargins(10, 10, 10, 10);
        listView.setLayoutParams(params); 
    }

下面是Gridview的  注意里面要设置你的列数

   public  void setListViewHeightBasedOnChildren(GridView listView) {  
        // 获取listview的adapter  
           ListAdapter listAdapter = listView.getAdapter();  
           if (listAdapter == null) {  
               return;  
           }  
           // 固定列宽，有多少列  
           int col = 4;// listView.getNumColumns();  
           int totalHeight = 0;  
           // i每次加4，相当于listAdapter.getCount()小于等于4时 循环一次，计算一次item的高度，  
           // listAdapter.getCount()小于等于8时计算两次高度相加  
           for (int i = 0; i < listAdapter.getCount(); i += col) {  
            // 获取listview的每一个item  
               View listItem = listAdapter.getView(i, null, listView);  
               listItem.measure(0, 0);  
               // 获取item的高度和  
               totalHeight += listItem.getMeasuredHeight()+40;  //添加40顶边距等
           }  
      
           // 获取listview的布局参数  
           ViewGroup.LayoutParams params = listView.getLayoutParams();  
           // 设置高度  
           params.height = totalHeight;  
           // 设置margin  
           ((MarginLayoutParams) params).setMargins(10, 10, 10, 10);  
           // 设置参数  
           listView.setLayoutParams(params);  
       }