(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

public static void setListViewHeightBasedOnChildren(ListView listView) {
// 获取ListView对应的Adapter
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
// pre-condition
return;
}

int totalHeight = 0;
for (int i = 0, len = listAdapter.getCount(); i < len; i++) { // listAdapter.getCount()返回数据项的数目
View listItem = listAdapter.getView(i, null, listView);
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 = listView.getLayoutParams();
params.height = totalHeight
+ (listView.getDividerHeight() * (listAdapter.getCount() - 1));
// listView.getDividerHeight()获取子项间分隔符占用的高度
// params.height最后得到整个ListView完整显示需要的高度
listView.setLayoutParams(params);
}

二、对于GridView

GridView gridview = new GridView(this);

setGridViewHeightBasedOnChildren(gridview );即可

public static 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;
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);
} 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);
}