一丶重新计算listview的高度

 public void setListViewHeightBasedOnChildren(ListView listView) {
        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();
        int height = getWindowManager().getDefaultDisplay().getHeight();
        params.height = totalHeight + (listView.getDividerHeight() *(listAdapter.getCount() - 1));
//        ((MarginLayoutParams) params).setMargins(10, 10, 10, 10); // 可删除
        listView.setLayoutParams(params);
    }

二丶重新计算gridview的高度

 public  void setGridViewHeightBasedOnChildren(GridView gridView) {
        // 获取GridView对应的Adapter
        ListAdapter listAdapter = gridView.getAdapter();
        if (listAdapter == null) {
            return;
        }
        int rows;
        int columns=0;
        int horizontalBorderHeight=0;
        int verticalBorderHeight =0;
        Class<?> clazz=gridView.getClass();
        try {
            //利用反射，取得每行显示的个数
            Field column=clazz.getDeclaredField("mRequestedNumColumns");
            column.setAccessible(true);
            columns=(Integer)column.get(gridView);
            //利用反射，取得横向分割线高度
            Field horizontalSpacing=clazz.getDeclaredField("mRequestedHorizontalSpacing");
            horizontalSpacing.setAccessible(true);
            horizontalBorderHeight=(Integer)horizontalSpacing.get(gridView);
            //利用反射，取得属竖向分割线高度
//            Field verticalSpacing =clazz.getDeclaredField("mRequestedVerticalSpacing");
//            verticalSpacing.setAccessible(true);
//            verticalBorderHeight=(Integer)verticalSpacing.get(gridView);
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        //判断数据总数除以每行个数是否整除。不能整除代表有多余，需要加一行
        if(listAdapter.getCount()%columns>0){
            rows=listAdapter.getCount()/columns+1;
        }else {
            rows=listAdapter.getCount()/columns;
        }
        int totalHeight = 0;
        for (int i = 0; i < rows; i++) { //只计算每项高度*行数
            View listItem = listAdapter.getView(i, null, gridView);
            listItem.measure(0, 0); // 计算子项View 的宽高
            totalHeight += listItem.getMeasuredHeight(); // 统计所有子项的总高度
        }
        ViewGroup.LayoutParams params = gridView.getLayoutParams();
        params.height = totalHeight+horizontalBorderHeight*(rows-1);//最后加上分割线总高度
        gridView.setLayoutParams(params);
    }