(转)解决ScrollView嵌套ListView或者GridView导致只显示一行的方法

即动态获取ListView和GridView的高度

一、对于ListView

ListView listview= new ListView(this);

setListViewHeightBasedOnChildren(listview);即可

 1 public static void setListViewHeightBasedOnChildren(ListView listView) {
 2                     // 获取ListView对应的Adapter
 3                     ListAdapter listAdapter = listView.getAdapter();
 4                     if (listAdapter == null) {
 5                             // pre-condition
 6                             return;
 7                     }
 8
 9                     int totalHeight = 0;
10                     for (int i = 0, len = listAdapter.getCount(); i < len; i++) { // listAdapter.getCount()返回数据项的数目
11                             View listItem = listAdapter.getView(i, null, listView);
12                             listItem.measure(0, 0); // 计算子项View 的宽高
13                             totalHeight += listItem.getMeasuredHeight(); // 统计所有子项的总高度
14                     }
15
16                     ViewGroup.LayoutParams params = listView.getLayoutParams();
17                     params.height = totalHeight
18                                     + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
19                     // listView.getDividerHeight()获取子项间分隔符占用的高度
20                     // params.height最后得到整个ListView完整显示需要的高度
21                     listView.setLayoutParams(params);
22             }

二、对于GridView

GridView gridview = new GridView(this);

setGridViewHeightBasedOnChildren(gridview );即可

 1 public static void setGridViewHeightBasedOnChildren(GridView gridView) {
 2                     // 获取GridView对应的Adapter
 3                     ListAdapter listAdapter = gridView.getAdapter();
 4                     if (listAdapter == null) {
 5                             return;
 6                     }
 7                     int rows;
 8                     int columns=0;
 9                     int horizontalBorderHeight=0;
10                     Class<?> clazz=gridView.getClass();
11                     try {
12                             //利用反射，取得每行显示的个数
13                             Field column=clazz.getDeclaredField("mRequestedNumColumns");
14                             column.setAccessible(true);
15                             columns=(Integer)column.get(gridView);
16                             //利用反射，取得横向分割线高度
17                             Field horizontalSpacing=clazz.getDeclaredField("mRequestedHorizontalSpacing");
18                             horizontalSpacing.setAccessible(true);
19                             horizontalBorderHeight=(Integer)horizontalSpacing.get(gridView);
20                     } catch (Exception e) {
21                             // TODO: handle exception
22                             e.printStackTrace();
23                     }
24                     //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
25                     if(listAdapter.getCount()%columns>0){
26                             rows=listAdapter.getCount()/columns+1;
27                     }else {
28                             rows=listAdapter.getCount()/columns;
29                     }
30                     int totalHeight = 0;
31                     for (int i = 0; i < rows; i++) { //只计算每项高度*行数
32                             View listItem = listAdapter.getView(i, null, gridView);
33                             listItem.measure(0, 0); // 计算子项View 的宽高
34                             totalHeight += listItem.getMeasuredHeight(); // 统计所有子项的总高度
35                     }
36                     ViewGroup.LayoutParams params = gridView.getLayoutParams();
37                     params.height = totalHeight+horizontalBorderHeight*(rows-1);//最后加上分割线总高度
38                     gridView.setLayoutParams(params);
39             }