导读：先实例化 exListView然后 exListView.setAdapter(exlvAdapter); //将所有项设置成默认展开 int groupCount = exListView.getCount(); for (int i=0; igroupCount; i++) { exListView.expandG......
先实例化 exListView
然后
exListView.setAdapter(exlvAdapter);
//将所有项设置成默认展开
int groupCount = exListView.getCount();
for (int i=0; i<groupCount; i++) {
exListView.expandGroup(i);
};--->即可哦！
