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public class ListviewUtil {
public static void setListViewHeightBasedOnChildren(ListView listView) {
// 获取ListView对应的Adapter
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
return;
}
int totalHeight = 0;
// listAdapter.getCount()返回数据项的数目
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
// 计算子项View 的宽高
listItem.measure(0, 0);
// 统计所有子项的总高度
totalHeight += listItem.getMeasuredHeight();
}
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);
}
public static int getheight(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
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();
}
return totalHeight;
}
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++) {
View listItem = listAdapter.getView(i, null, gridView);
listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = gridView.getLayoutParams();
params.height = totalHeight + horizontalBorderHeight * (rows - 1);
gridView.setLayoutParams(params);
}
}
直接使用下列工具类,如果是嵌套listview调用ListviewUtil.setListViewHeightBasedOnChildren(listview);
如果是嵌套gridview调用ListviewUtil.setGridViewHeightBasedOnChildren(gridview);
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