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);

       }