安卓 三级菜单 三级树目录
三级树目录：
下载地址：https://download.csdn.net/download/hdhhd/12527325
先上图：
下载打开即可直接使用：只需要在gson.fromJson(" ",Get_Personne.class);这里添加自己的json数据即可,然后传给adapter
//数据可以自己添加
get_personne=gson.fromJson("{}",Get_Personne.class);
ExpandableListviewAdapter adapter = new ExpandableListviewAdapter(MainActivity.this, get_personne);实现：
activity_main：
MainActivity：import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ExpandableListView;
import android.widget.Toast;
import com.google.gson.Gson;
import youli.com.example.administrator.threelevelmenu.adapter.ExpandableListviewAdapter;
import youli.com.example.administrator.threelevelmenu.info.Get_Personne;
public class MainActivity extends AppCompatActivity implements ExpandableListviewAdapter.OnRvItemClickListener{
private ExpandableListView expand_list_id;
private Get_Personne get_personne;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initview();
}
private void initview() {
Gson gson=new Gson();
//这里是gson解析，数据可以自己添加
get_personne=gson.fromJson("{}",Get_Personne.class);
ExpandableListviewAdapter adapter;
expand_list_id = findViewById(R.id.expand_list_id);
adapter = new ExpandableListviewAdapter(MainActivity.this,get_personne);
adapter.setOnRvItemClickListener(this); //点击事件
expand_list_id.setAdapter(adapter);
//默认展开第一个数组
// expand_list_id.expandGroup(0);
//关闭数组某个数组，可以通过该属性来实现全部展开和只展开一个列表功能
//expand_list_id.collapseGroup(0);
expand_list_id.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView expandableListView, View view, int groupPosition, long l) {
// Toast.makeText(getActivity(),get_personne1.getSubName().get(groupPosition).getName(),Toast.LENGTH_SHORT).show();
// window.dismiss();
return false;
}
});
//子视图的点击事件
expand_list_id.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView expandableListView, View view, int groupPosition, int childPosition, long l) {
Toast.makeText(MainActivity.this, get_personne.getSubName().get(groupPosition).getSubName().get(childPosition).getSubName().get(childPosition).getName(), Toast.LENGTH_SHORT).show();
return true;
}
});
expand_list_id.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
// Toast.makeText(getActivity(), get_personne1.getSubName().get(position).getSubName().get(position).getSubName().get(position).getName(), Toast.LENGTH_SHORT).show();
}
});
//用于当组项折叠时的通知。
expand_list_id.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(MainActivity.this,"折叠了数据"+get_personne.getSubName().get(groupPosition).getName(),Toast.LENGTH_LONG).show();
}
});
//用于当组项折叠时的通知。
expand_list_id.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
Toast.makeText(MainActivity.this,"展开了数据"+get_personne.getSubName().get(groupPosition).getName(),Toast.LENGTH_LONG).show();
}
});
}
//二三层点击事件
@Override
public void OnItemClick(int position, int position1) {
String values = get_personne.getSubName().get(position).getSubName().get(position1).getName();
Toast.makeText(MainActivity.this,values+"",Toast.LENGTH_SHORT).show();
}
@Override
public void OnOptionClick(int position, int position1, int position2) {
String values = get_personne.getSubName().get(position).getSubName().get(position1).getSubName().get(position2).getName();
Toast.makeText(MainActivity.this,values+"",Toast.LENGTH_SHORT).show();
}
}
CustomExpandableListView：
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ExpandableListView;
/**
* author:Created by LiangSJ
* date: 2020/6/15.
* description:解决，expandablelistview嵌套冲突问题
*/
public class CustomExpandableListView extends ExpandableListView {
public CustomExpandableListView(Context context) {
super(context);
}
public CustomExpandableListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomExpandableListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public CustomExpandableListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 解决显示不全的问题
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2
, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}
ExpandableListviewAdapter：
import android.annotation.SuppressLint;
import android.content.Context;
import android.support.v4.content.ContextCompat;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import youli.com.example.administrator.threelevelmenu.R;
import youli.com.example.administrator.threelevelmenu.info.Get_Personne;
/**
* Created by Administrator on 2020/6/15.
*/
public class ExpandableListviewAdapter extends BaseExpandableListAdapter {
private Context context;
private Get_Personne get_personne;
public ExpandableListviewAdapter(Context context, Get_Personne get_personne) {
this.context = context;
this.get_personne = get_personne;
}
//设置二三层点击事件接口
private OnRvItemClickListener onRvItemClickListener;
public interface OnRvItemClickListener {
void OnItemClick(int position,int position1);
void OnOptionClick(int position,int position1,int position2);
}
public void setOnRvItemClickListener(OnRvItemClickListener onRvItemClickListener) {
this.onRvItemClickListener = onRvItemClickListener;
}
//获取第一层组计数
@Override
public int getGroupCount() {
return get_personne.getSubName().size();
}
//获取第二层子计数
@Override
public int getChildrenCount(int groupPosition) {
// 重点这里改成1才显示三层结构
return 1; //get_personne.getSubName().get(groupPosition).getSubName().size();
}
//获取组
@Override
public Object getGroup(int groupPosition) {
return get_personne.getSubName().get(groupPosition);
}
//获取子目录
@Override
public Object getChild(int groupPosition, int childPosition) {
return get_personne.getSubName().get(groupPosition).getSubName().get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
//分组和子选项是否持有稳定的ID, 就是说底层数据的改变会不会影响到它们
public boolean hasStableIds() {
return true;
}
/**
* 获取显示指定组的视图对象
*
* @param groupPosition 组位置
* @param isExpanded 该组是展开状态还是伸缩状态，true=展开
* @param convertView 重用已有的视图对象
* @param parent 返回的视图对象始终依附于的视图组
*/
@SuppressLint("WrongViewCast")
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
GroupViewHolder groupViewHolder;
if (convertView == null) {
convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.sanjicaidan_one_layout, parent, false);
groupViewHolder = new GroupViewHolder();
groupViewHolder.parent_textview_id = convertView.findViewById(R.id.parent_textview_id);
groupViewHolder.parent_image = convertView.findViewById(R.id.parent_image);
convertView.setTag(groupViewHolder);
} else {
groupViewHolder = (GroupViewHolder) convertView.getTag();
}
groupViewHolder.parent_textview_id.setText(get_personne.getSubName().get(groupPosition).getName());
// 如果是展开状态
if (isExpanded) {
groupViewHolder.parent_image.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.pwpjt2));
} else {
groupViewHolder.parent_image.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.pwpjt1));
}
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
//如果要显示二级树目录直接把线面注释、然后添加需要展示的数据
CustomExpandableListView customExpandableListView = (CustomExpandableListView) convertView;
if (convertView == null) {
customExpandableListView = new CustomExpandableListView(context);
}
customExpandableListView.setGroupIndicator(null); //去掉默认箭头
Get_Personne.SubNameBeanXX url = get_personne.getSubName().get(groupPosition);
SecondAdapter secondAdapter = new SecondAdapter(context, url.getSubName()); //Adapter
customExpandableListView.setAdapter(secondAdapter); //显示二层、三层
//点击事件
customExpandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int childPosition, long id) {
if (onRvItemClickListener != null) {
onRvItemClickListener.OnItemClick(groupPosition,childPosition);
}
return false;
}
});
customExpandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
if (onRvItemClickListener != null) {
onRvItemClickListener.OnOptionClick(groupPosition,groupPosition,childPosition);
}
return false;
}
});
return customExpandableListView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
class SecondAdapter extends BaseExpandableListAdapter {
//第二三层数据
private List subxxList = new ArrayList<>();
private Context context;
public SecondAdapter(Context context, List subxxList) {
this.subxxList = subxxList;
this.context = context;
}
@Override
public int getGroupCount() {
return subxxList.size();
}
@Override
public int getChildrenCount(int groupPosition) {
return subxxList.get(groupPosition).getSubName().size();
}
@Override
public Object getGroup(int groupPosition) {
return subxxList.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return subxxList.get(groupPosition).getSubName().get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
GroupViewHolder2 groupViewHolder2 = null;
if (convertView == null) {
groupViewHolder2 = new GroupViewHolder2();
convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.snajicaidan_two_layout, parent, false);
groupViewHolder2.chidren_item = convertView.findViewById(R.id.chidren_item);
groupViewHolder2.parent_image2 = convertView.findViewById(R.id.parent_image2);
convertView.setTag(groupViewHolder2);
} else {
groupViewHolder2 = (GroupViewHolder2) convertView.getTag();
}
if (!TextUtils.equals(subxxList.get(groupPosition).getName(), "当前就业")) {
//如果是展开状态
if (isExpanded) {
groupViewHolder2.parent_image2.setImageDrawable(ContextCompat.getDrawable(context,R.color.yr));
} else {
groupViewHolder2.parent_image2.setImageDrawable(ContextCompat.getDrawable(context,R.color.yr));
}
}
if (TextUtils.equals(subxxList.get(groupPosition).getName(), "当前就业")) {
//如果是展开状态
if (isExpanded) {
groupViewHolder2.parent_image2.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.pwpjt2));
} else {
groupViewHolder2.parent_image2.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.pwpjt1));
}
}
groupViewHolder2.chidren_item.setText(subxxList.get(groupPosition).getName());
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
GroupViewHolder3 groupViewHolder3;
if (convertView == null) {
convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.snajicaidan_three_layout, parent, false);
groupViewHolder3 = new GroupViewHolder3();
groupViewHolder3.chidren_item_iten = convertView.findViewById(R.id.chidren_item_iten);
convertView.setTag(groupViewHolder3);
} else {
groupViewHolder3 = (GroupViewHolder3) convertView.getTag();
}
groupViewHolder3.chidren_item_iten.setText(subxxList.get(groupPosition).getSubName().get(childPosition).getName());
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
static class GroupViewHolder {
TextView parent_textview_id;
ImageView parent_image;
}
static class GroupViewHolder2 {
TextView chidren_item;
ImageView parent_image2;
}
static class GroupViewHolder3 {
TextView chidren_item_iten;
}
}
重点是这个Adapter里面，点击事件是一个接口的回调 ，都有注释
数据使用gson解析，所以依赖也附上：
//gson解析
compile 'com.google.code.gson:gson:2.7'