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 = ;
        for (int i = ; i < listAdapter.getCount(); i++) {
            View listItem = listAdapter.getView(i, null, listView);
            listItem.measure(, );
            totalHeight += listItem.getMeasuredHeight();
        }
        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount()-));
        ((MarginLayoutParams)params).setMargins(, , , );
        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 = ;// listView.getNumColumns();
           int totalHeight = ;
           // 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 = ; i < listAdapter.getCount(); i += col) {
            // 获取listview的每一个item
               View listItem = listAdapter.getView(i, null, listView);
               listItem.measure(, );
               // 获取item的高度和
               totalHeight += listItem.getMeasuredHeight()+;  //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(, , , );
           // 设置参数
           listView.setLayoutParams(params);
       }