ExpandableListView 设置默认展开

1、先实例化一个ExpandableListView对象，例如mExpandableListView

2、然后mExpandableListView.setAdapter(exlvAdapter);

3、//遍历所有group,将所有项设置成默认展开

int groupCount = mExpandableListView.getCount();

for (int i=0; i<groupCount; i++) {

mExpandableListView.expandGroup(i);

};