ExpandableListView事件回调

需求 模拟childView的点击事件 当点击某个组时它的第一个childItem需要被点击

需要模拟点击事件 须知点击事件流程

点击事件流程

基础流程

onTouchUp(触摸弹起事件)——》PerformClick.run ——》performItemClick ——》handleItemClick

groupClickEvent 基础流程——》onGroupClick ——》isExpanded ——》？collapseGroup：expandGroup

注意：当onGroupClick 返回truecollapseGroup或expandGroup将不会被回调 继当里点击了某个group它不会自动展开或关闭该groupf

childClickEvent 基础流程



例如：4个组列表没个组4个子列表 页面加载时

需要显示地一组的第一个 通过performItemClick
（null,0,0）展开地一个列表 通过performItemClick
（null,1,0） 加载第一项

需要显示地三组的第一个 通过performItemClick
（null,3,0）展开地一个列表 通过performItemClick
（null,4,0） 加载第一项

需要显示地三组的第三个 通过performItemClick
（null,3,0）展开地一个列表 通过performItemClick
（null,6,0） 加载第一项

公示 childPosition=groupPosition+显示第几个

显示第三组下第三项 时 加载子列表的应该是performItemClick
（null,6,0） 如果写成performItemClick
（null,8,0）会怎样了？

第三组下只有四项 显示最后一个是performItemClick
（null,7,0） 8大于7 这时将会调用groupClick position为8 由于只有4组 8超出了所有把position修改成3 所以将展开第4组

展开地3组时 执行performItemClick
（null,1，0） 会展开第二组

下面两组代码都是显示地0组地一项

mElvLeftMenus.performItemClick(null,0,0);
mElvLeftMenus.performItemClick(null,1,0);

mElvLeftMenus.expandGroup(0);
mElvLeftMenus.performItemClick(null,1,0);

下面的为折叠第0组

mElvLeftMenus.collapseGroup(0);

group的点击事件 当某个group被点击时被回调

定义

public void setOnGroupClickListener(OnGroupClickListener onGroupClickListener) {
mOnGroupClickListener = onGroupClickListener;
}

/**
* Interface definition for a callback to be invoked when a group in this
* expandable list has been clicked.
*/
public interface OnGroupClickListener {
/**
* Callback method to be invoked when a group in this expandable list has
* been clicked.
*
* @param parent The ExpandableListConnector where the click happened
* @param v The view within the expandable list/ListView that was clicked
* @param groupPosition The group position that was clicked
* @param id The row id of the group that was clicked
* @return True if the click was handled
*/
boolean onGroupClick(ExpandableListView parent, View v, int groupPosition,
long id);
}

实现

ExpandableListView.OnGroupClickListener groupListener=new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {

String groupName=String.valueOf(mLeftMenuAdapter.getGroup(groupPosition));
ToastManager.debug(groupName, false);

if(mLeftMenuSlectGroupPosition == groupPosition){
//重复点击
return false;
}

mLeftMenuSlectGroupPosition = groupPosition;

String[] child = mLeftMenuAdapter.getChild(groupPosition);
if (child==null || child.length==0) {

BaseActivity.this.onLeftMenuGroupClick(parent, v, groupPosition, groupName);
return false;
}else {
//             boolean isGroupExpanded=mElvLeftMenus.isGroupExpanded(groupPosition);
//             if(isGroupExpanded){
//                //这里不可能进来 能进这里条件mLeftMenuSlectGroupPosition == groupPosition过不了
//                return false;
//             }

mUiHandler.postDelayed(new Runnable() {
@Override
public void run() {
int childPosition=mLeftMenuSlectGroupPosition+1;
mElvLeftMenus.performItemClick(null,childPosition,mLeftMenuAdapter.getChildId(mLeftMenuSlectGroupPosition,childPosition));
}
},100);
}
return false;
}
};

group展开时的回调事件 当某个group展开时 它被回调

public void setOnGroupExpandListener(OnGroupExpandListener onGroupExpandListener) {
mOnGroupExpandListener = onGroupExpandListener;
}

实现

mElvLeftMenus.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {

@Override
public void onGroupExpand(int groupPosition) {
int groupCount = mLeftMenuAdapter.getGroupCount();
for (int index = 0; index <groupCount; index++) {
if (groupPosition != index) {
mElvLeftMenus.collapseGroup(index);
}
}

}

});

上面的实现效率不咋样可以优化 使用一变量记录上一次展开的groupPosition 当展开列表时判断上次展开列表是否为-1不为-1折叠该组

group折叠回调事件 当某个group折叠时被回调

public void setOnGroupCollapseListener(OnGroupCollapseListener onGroupCollapseListener) {
mOnGroupCollapseListener = onGroupCollapseListener;
}

当设置了onItemSelectedListener 当group或child点击后 onGroupClickListener 或 onChildClickListener都没有得到处理时才会回调它

/**
* Register a callback to be invoked when an item in this AdapterView has
* been selected.
*
* @param listener The callback that will run
*/
public void setOnItemSelectedListener(@Nullable OnItemSelectedListener listener) {
mOnItemSelectedListener = listener;
}

setSelectedGroup 显示到指定组 setSelectedChild 显示到指定组下的某的子项 它们都是调用AbsListView的setSelection方法进行定位

child点击事件 当child被点击时回调

如

ExpandableListView.OnChildClickListener childListener=new ExpandableListView.OnChildClickListener(){
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
if(v!=null && mLeftMenuSlectGroupPosition ==groupPosition && mLeftMenuSlectChildPosition ==childPosition){
//当v为null时是点击了group 这样的画groupPosition和childPosition有可能相同
ToastManager.debug("点击的为当前页面,不做处理", false);
return true;
}

mLeftMenuSlectGroupPosition =groupPosition;
mLeftMenuSlectChildPosition =childPosition;

String childName=String.valueOf(mLeftMenuAdapter.getChild(groupPosition,childPosition));
ToastManager.debug(childName, false);

BaseActivity.this.onLeftMenuChildClick(parent, v, groupPosition,childPosition, childName);
return true;
}
};