ExpandableListView中group和child都带CheckBox,实现child的全选功能，包含部分选中功能，同时实现类似邮件群发的用户选择功能，选中的用户在EditText中显示，点击后移除.-Group and child in the ExpandableListView with a CheckBox, the child' s Select All function, including part of the selected function, similar