实现ExpandableListView 二级列表，点击二级条目状态的改变

概述

重要API：

expandGroup (int groupPos) ;//在分组列表视图中 展开一组
setSelectedGroup (int groupPosition) ;//设置选择指定的组
setSelectedChild (int groupPosition, int childPosition, boolean shouldExpandGroup);//设置选择指定的子项
getPackedPositionGroup (long packedPosition);//返回所选择的组
getPackedPositionForChild (int groupPosition, int childPosition) ;
//返回所选择的子项
getPackedPositionType (long packedPosition);//返回所选择项的类型（Child,Group）
isGroupExpanded (int groupPosition);//判断此组是否展开
expandableListView.setDivider();这个是设定每个Group之间的分割线。
expandableListView.setGroupIndicator();这个是设定每个Group之前的那个图标
expandableListView.collapseGroup(int group); 将第group组收起

适配器–ExpandableListAdapter

expandableListView.setAdapter(new BaseExpandableListAdapter(){}//设置对应的适配器

getGroupCount();//设置Group总条目
getChildrenCount(int groupPosition);//设置Children总条目
getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent);//设置Group数据与视图绑定
getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent); //设置Child数据与视图绑定

具体使用

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.blueocean2016.skycn.expandablelistview.MainActivity">

<TextView
android:layout_width="match_parent"
android:background="#3192a6"
android:textColor="@android:color/white"
android:textSize="20sp"
android:gravity="center"
android:layout_height="35dp"
android:text="信息查询"/>

<ExpandableListView
android:id="@+id/expand"
android:layout_width="match_parent"
android:layout_height="match_parent">

</ExpandableListView>

</LinearLayout>

package com.blueocean2016.skycn.expandablelistview;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends Activity implements ExpandableListView.OnChildClickListener, ExpandableListView.OnGroupClickListener {

private List<String> mGroupData;
private List<String> mChildData;
private ExpandableListView mExlistview;

private int mCurrentGroupPosition = -1; //默认全关闭

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mExlistview = (ExpandableListView) findViewById(R.id.expand);

mExlistview.setOnChildClickListener(this);
mExlistview.setOnGroupClickListener(this);

initData();
}

private void initData() {

mGroupData = new ArrayList<>();
mChildData = new ArrayList<>();

//模拟一级条目数据
for (int i = 0; i < 50; i++) {
mGroupData.add("一级条目" + i);
}

//模拟二级条目数据
for (int i = 0; i <5 ; i++) {
mChildData.add("2254655" + i);
}

//设置适配器
mExlistview.setAdapter(new BaseExpandableListAdapter() {

@Override
public int getGroupCount() {
return mGroupData.size();
}

@Override
public int getChildrenCount(int groupPosition) {
return mChildData.size();
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {

//TextView与数据绑定
String text = mGroupData.get(groupPosition);
TextView tv1 = new TextView(MainActivity.this);
tv1.setText(text);
tv1.setPadding(40, 0, 0, 0);
tv1.setTextColor(Color.RED);
tv1.setTextSize(16);

return tv1;
}

@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {

//TextView与数据绑定
String text = mChildData.get(childPosition);
TextView tv2 = new TextView(MainActivity.this);
tv2.setPadding(40, 0, 0, 0);
tv2.setText(text);
tv2.setTextSize(16);

return tv2;
}

/*---------------------其他暂时不关注---------------------*/

@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;
}

/**
* 如果需要child条目获取点击事件, 需要设置为true
* @param groupPosition
* @param childPosition
* @return
*/
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
});
}

/**
* 设置child条目点击拨打电话
* @param parent
* @param v
* @param groupPosition
* @param childPosition
* @param id
* @return
*/
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {

String number = mChildData.get(childPosition);
Intent intent = new Intent();
//指定拨打电话的动作
intent.setActio
9c48
n(Intent.ACTION_CALL);
//获取号码
intent.setData(Uri.parse("tel://" + number));
startActivity(intent);
//消费事件
return true;
}

/**
* 设置Group点击状态的改变
* @param parent
* @param v
* @param groupPosition
* @param id
* @return
*/
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {

if(mCurrentGroupPosition == -1){
//等于-1 --> 没有任何组打开

//展开组
mExlistview.expandGroup(groupPosition);
//设置第一个位置是那个组
mExlistview.setSelectedGroup(groupPosition);
//重新对记录进行赋值
mCurrentGroupPosition = groupPosition;

}else{
//不等于-1 --> 代表以前有组打开

if (groupPosition == mCurrentGroupPosition){
//如果当前点击的是以前打开过的组,那么就关闭它
mExlistview.collapseGroup(groupPosition);

//记录回到最初
mCurrentGroupPosition = -1;
}else{
//如果当前点击的不是以前打开过的组,而是其他组

//关闭以前的组
mExlistview.collapseGroup(mCurrentGroupPosition);
//展开当前点击的组
mExlistview.expandGroup(groupPosition);
//设置第一个位置是那个组
mExlistview.setSelectedGroup(groupPosition);

//重新对记录进行赋值
mCurrentGroupPosition = groupPosition;
}

}
//消费事件
return true;
}
}

关注点

运行效果图