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ExpandableListView的group里添加button后不能展开的原因是button获取了原本属于group的焦点，所以不能展开 解决方法：设置button， reply.setFocusable(false); 设置button不获取焦点，但可以点击reply.setClickable(true);
for(int i = 0 ;i < groupList.size();i ++){ expandbleListview.expandGroup(i);
for(int i = 0 ;i < groupList.size();i ++){
expandbleListview.expandGroup(i);
} 如果使用adapter.notifyDataSetChanged();要在notify之后展开
}