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 = totalHeight18                                     + (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 exception22                             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             }