ExpandableListView  (二级列表)使用demo

1.先建立两个item布局  分别为groupItem 和 childItem

2.在主函数xml中创建ExpandableListView   该控件在V7包下

3.写Adapter

4.布局代码:

groupItem:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="@+id/group_name"/>

</LinearLayout>

childItem:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="@+id/child_name_second"/>
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="@+id/child_sex_second"/>

</LinearLayout>

xml布局代码:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ExpandableListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/expandablelistview_second"/>

</LinearLayout>

Adapter代码:

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

import com.tianhe.mydemo.second.SecondChildBean;
import com.tianhe.mydemo.second.SecondGroupBean;

import java.util.ArrayList;

/**
* Created by dllo on 15/12/29.
* ExpandableListView(二级列表)
*/
public class SecondExpandableBaseAdapter extends BaseExpandableListAdapter {
//定义二个实体类承载数据
//一为groupitem,一为childitem
private ArrayList<SecondGroupBean> groupBeans;
private ArrayList<SecondChildBean> childBeans;
private Context context;

//构造方法,将实体类的值传到主函数中
public SecondExpandableBaseAdapter(ArrayList<SecondGroupBean> groupBeans, ArrayList<SecondChildBean> childBeans, Context context) {
this.groupBeans = groupBeans;
this.childBeans = childBeans;
this.context = context;
}

//item的数量   为groupitem的size
@Override
public int getGroupCount() {
return groupBeans.size();
}

/**
*在ExpandableListView中 继承了BaseExpandableListAdapter之后
* 会复写是个方法  其中前两个方法的返回值需要填写  其他的方法都不需要更改
* 其次是 getGroupView和getChildView按照ListView的getView填写
* 需要两个缓存类
* 缓存类的通用方法都类似   记住模式
*/
@Override
public int getChildrenCount(int groupPosition) {
return groupPosition;
}

@Override
public Object getGroup(int groupPosition) {
return null;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
return null;
}

@Override
public long getGroupId(int groupPosition) {
return 0;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
return 0;
}

@Override
public boolean hasStableIds() {
return false;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
GroupViewHolder groupViewHolder;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.item_second_group, parent, false);
//切记  此处别忘了缓存类的初始化
groupViewHolder = new GroupViewHolder();
groupViewHolder.groupName = (TextView) convertView.findViewById(R.id.group_name);
convertView.setTag(groupViewHolder);
} else {
groupViewHolder = (GroupViewHolder) convertView.getTag();
}
groupViewHolder.groupName.setText(groupBeans.get(groupPosition).getName());
return convertView;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
ChildViewHolder childViewHolder;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.item_second_child, parent, false);
//切记  此处别忘了缓存类的初始化
childViewHolder = new ChildViewHolder();
childViewHolder.childNmae = (TextView) convertView.findViewById(R.id.child_name_second);
childViewHolder.childSex = (TextView) convertView.findViewById(R.id.child_sex_second);
convertView.setTag(childViewHolder);
} else {
childViewHolder = (ChildViewHolder) convertView.getTag();
}
childViewHolder.childNmae.setText(childBeans.get(childPosition).getName());
childViewHolder.childSex.setText(childBeans.get(childPosition).getSex());
return convertView;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}

class GroupViewHolder {
TextView groupName;
}

class ChildViewHolder {
TextView childNmae, childSex;
}
}

主函数代码(Fragment中):

import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListView;

import com.tianhe.mydemo.second.SecondChildBean;
import com.tianhe.mydemo.second.SecondGroupBean;

import java.util.ArrayList;

/**
* Created by dllo on 15/12/29.
* fragment中为主函数构建ExpandableListView
* 创建了Fragment生命周期
*/
public class SecondFragment extends Fragment{
private Context context;
private ArrayList<SecondGroupBean> groupBeans;
private ArrayList<SecondChildBean> childBeans;
private ExpandableListView mExpandableListView;
private SecondExpandableBaseAdapter mSecondExpandableBaseAdapter;
@Override
public void onAttach(Context context) {
super.onAttach(context);
this.context = context;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mExpandableListView = (ExpandableListView) getActivity().findViewById(R.id.expandablelistview_second);
groupBeans = new ArrayList<>();
for (int i = 0; i < 30; i++) {
groupBeans.add(new SecondGroupBean("我是第" + i + "老爹"));
}
childBeans = new ArrayList<>();
for (int j = 0; j < 30; j++) {
childBeans.add(new SecondChildBean("我是第" + j + "儿子","我是第" + j + "小儿子"));
}
mSecondExpandableBaseAdapter = new SecondExpandableBaseAdapter(groupBeans,childBeans,context);
mExpandableListView.setAdapter(mSecondExpandableBaseAdapter);
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_second,null);
return view;
}
}

添加数据,删除数据的自定义方法(适配器代码):

//向已有的组加信息
public void addData(String newData,int group,int childPos){
child.get(group).add(childPos,newData);
notifyDataSetChanged();
}
//插入新的组并插入信息
public void addData(String groupName,String childData,int groupPos){
//新的这一组加到groupPos的位置,组名是groupName
group.add(groupPos,groupName);
//为这新的一组,创建一个新的集合,装着child的数据
List<String> newChild = new ArrayList<>();
//向这个新的集合里添加数据
newChild.add(childData);
//将这个新的集合加到指定的组的位置
child.add(groupPos, newChild);
//通知适配器,刷新数据
notifyDataSetChanged();
}

public void delData(int grouppos) {
//通知adapter,position位置数据被删除
if (group.size() <= grouppos) {
return;
}
notifyDataSetChanged();
group.remove(grouppos);

}

主函数代码:

//guroup组添加监听
mExpandableListView.setOnGroupClickListener(this);
//长按监听
mExpandableListView.setOnItemLongClickListener(this);
//子项添加监听
mExpandableListView.setOnChildClickListener(this);

////返回false则子项可以打开,返回true可以获取焦点,但是子项不能打开
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
Toast.makeText(context, "group" + groupPosition, Toast.LENGTH_SHORT).show();
return false;
}

//长按监听事件中,返回true为正确  若同时有短按监听和长按监听,返回false则都会相应
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
mSecondExpandableBaseAdapter.delData(position);
return true;
}

@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
Toast.makeText(context, "child" + childPosition, Toast.LENGTH_SHORT).show();

return true;
}

demo效果: