ExpandableListView解析JSON数据

效果图：

                                     

 说明：刚开始使用这个控件我花费了3天的时间，但是一直都没有达到预期的效果，要么就是直接全部不显示，要么就是数据累加了或者点击一级标题两三次才获取到子项数据（是子类父类没有相关联，导致适配器在初始化数据的时候导致数据混乱）

步骤：一.布局的安排

1.activity_menumanager.xml（主布局）代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    tools:context=".MenuManager"
    android:background="#EDEFF2"
    >
    <EditText
        android:textSize="@dimen/sp_14"
        android:layout_margin="@dimen/dp_10"
        android:gravity="center"
        android:hint="搜索"
        android:layout_width="match_parent"
        android:layout_height="50dp" />
<ExpandableListView
    android:id="@+id/list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"></ExpandableListView>
</LinearLayout>

 2.parent_item.xml(一级标题的布局)  代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/parentlist"
    android:paddingBottom="8dp"
    android:paddingLeft="32dp"
    android:paddingTop="8dp"
    android:textColor="@android:color/black"
    android:textSize="18sp"
    android:text="我是大哥大"
    />

</RelativeLayout>

3.child_item.xml(二级目录的布局) 代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:id="@+id/childlist"
    android:layout_height="wrap_content"
 >

    <RelativeLayout
        android:layout_marginTop="@dimen/dp_10"
        android:background="#EDEFF2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <ImageView
            android:id="@+id/list_image_search"
            android:padding="5dp"
            android:layout_margin="10dp"
            android:layout_alignParentLeft="true"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:src="@drawable/dream"
            />
    <TextView
        android:id="@+id/classify"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/list_image_search"
        android:text="系统设置"
        android:textColor="#000"
        android:textSize="14dp"
        android:layout_marginTop="14dp"
        />
    <TextView
        android:id="@+id/link"
        android:layout_marginTop="5dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/classify"
        android:layout_toRightOf="@+id/list_image_search"
        android:text="Basefunction/index"
        />
    <TextView
        android:id="@+id/color"
        android:padding="15dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:text="black"
        />
    </RelativeLayout>
</LinearLayout>

步骤二，JSON实体类

1.parent_item所对应的JSON实体类 代码：

package com.smartgentechnology.entity;

import java.util.List;

public class ParentExpand {

    /**
     * info : access
     * data : [{"id":"1","pid":"0","name":"系统设置","mca":"Basefunction/index","ico":" icon-cog","color":"black","order_number":"1"},{"id":"15","pid":"0","name":"报表模块","mca":"Ormodule/index","ico":"icon-th-large","color":"","order_number":"2"},{"id":"17","pid":"0","name":"返修模块","mca":"Business/index","ico":"icon-th-large","color":"","order_number":"3"}]
     */

    private String info;
    private List<DataBean> data;

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }

    public List<DataBean> getData() {
        return data;
    }

    public void setData(List<DataBean> data) {
        this.data = data;
    }

    public static class DataBean {
        /**
         * id : 1
         * pid : 0
         * name : 系统设置
         * mca : Basefunction/index
         * ico :  icon-cog
         * color : black
         * order_number : 1
         */

        public DataBean(String name,String id){
            this.name=name;
            this.id = id;
        }
        private String id;
        private String pid;
        private String name;
        private String mca;
        private String ico;
        private String color;
        private String order_number;

        private List<ItemBean.DataBean> list_child = new ArrayList<ItemBean.DataBean>();
        public List<ItemBean.DataBean> getList_child() {
                return list_child;
                                                       }

        public void setList_child(List<ItemBean.DataBean> list_child) {
               this.list_child = list_child;
                                                        }//致使父类和子类相关联，致使数据不会混乱排序

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }

        public String getPid() {
            return pid;
        }

        public void setPid(String pid) {
            this.pid = pid;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getMca() {
            return mca;
        }

        public void setMca(String mca) {
            this.mca = mca;
        }

        public String getIco() {
            return ico;
        }

        public void setIco(String ico) {
            this.ico = ico;
        }

        public String getColor() {
            return color;
        }

        public void setColor(String color) {
            this.color = color;
        }

        public String getOrder_number() {
            return order_number;
        }

        public void setOrder_number(String order_number) {
            this.order_number = order_number;
        }
    }
}

2.childitem所对应的JSON实体类 代码(parent和child的实体类是一样的，但是child装载的数据是根据parent的id来进行解析的)：

package com.smartgentechnology.entity;

import java.util.List;

public class ItemBean {

    /**
     * info : access
     * data : [{"id":"1","pid":"0","name":"系统设置","mca":"Basefunction/index","ico":" icon-cog","color":"black","order_number":"1"},{"id":"15","pid":"0","name":"报表模块","mca":"Ormodule/index","ico":"icon-th-large","color":"","order_number":"2"},{"id":"17","pid":"0","name":"返修模块","mca":"Business/index","ico":"icon-th-large","color":"","order_number":"3"}]
     */

    private String info;
    private List<DataBean> data;

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }

    public List<DataBean> getData() {
        return data;
    }

    public void setData(List<DataBean> data) {
        this.data = data;
    }

    public static class DataBean {
        /**
         * id : 1
         * pid : 0
         * name : 系统设置
         * mca : Basefunction/index
         * ico :  icon-cog
         * color : black
         * order_number : 1
         */

           public DataBean(String name,String mca,String color){
                this.name=name;
                this.mca =mca;
                this.color = color;

        }
        private String id;
        private String pid;
        private String name;
        private String mca;
        private String ico;
        private String color;
        private String order_number;

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }

        public String getPid() {
            return pid;
        }

        public void setPid(String pid) {
            this.pid = pid;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getMca() {
            return mca;
        }

        public void setMca(String mca) {
            this.mca = mca;
        }

        public String getIco() {
            return ico;
        }

        public void setIco(String ico) {
            this.ico = ico;
        }

        public String getColor() {
            return color;
        }

        public void setColor(String color) {
            this.color = color;
        }

        public String getOrder_number() {
            return order_number;
        }

        public void setOrder_number(String order_number) {
            this.order_number = order_number;
        }
    }
}

步骤三，menumanager活动的JSON数据解析(parent和child的数据的解析，然后传输给ExpandListViewAdapter进行数据的展示)：

package com.smartgentechnology;

import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ExpandableListView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

import com.google.gson.Gson;

import com.smartgentechnology.adapter.ExpandableAdapter;

import com.smartgentechnology.entity.ItemBean;
import com.smartgentechnology.entity.ParentExpand;
import com.smartgentechnology.post.GetHttp;
import com.syd.oden.circleprogressdialog.core.CircleProgressDialog;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class MenuManager extends AppCompatActivity {
    private static final String TAG = "tag";
    // 准备数据
    private List<ParentExpand.DataBean> groupString;//新建一个数据接受器
    private ExpandableListView expandableListView;//控件
    private String address;
    Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menumanager);
        address = getString(R.string.menu_manager);
        initDatas();
    }
    private void initDatas() {
        groupString = new ArrayList<ParentExpand.DataBean>();
        new Thread(new Runnable() {
            @Override
            public void run() {
                GetHttp.getOkHttpRequest(address, "10", "0", "0", new Callback() {//get网络请求给一级标题
                    @Override
                    public void onFailure(Call call, IOException e) {
                        Log.i("expanding false", "" + e);
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        String result = response.body().string();
                        Log.i("wiqu", "f" + result);

                        parseJsonWith(result);
                        response.body().close();//关闭网络请求

                    }
                });
            }
        }).start();
    }

    private void parseJsonWith(String result) {//解析数据传入界面（一级标题）
        ParentExpand parentExpand = new Gson().fromJson(result, ParentExpand.class);
        List<ParentExpand.DataBean> dataBeans = parentExpand.getData();
        for (ParentExpand.DataBean dataBean : dataBeans) {
            ParentExpand.DataBean mData = new ParentExpand.DataBean(dataBean.getName(), dataBean.getId());
            //String groupid = dataBean.getId();
            mData.setList_child(sendSecond(groupid));
            groupString.add(mData);
            Log.i("kukuku", "" + groupString);
        }
        inii();
    }

    private void inii() {
        this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                expandableListView = findViewById(R.id.list);
                ExpandableAdapter adapter = new ExpandableAdapter(MenuManager.this, groupString);
                expandableListView.setAdapter(adapter);

                expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
                    @Override
                    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
                        ItemBean.DataBean dataBean = groupString.get(groupPosition).getList_child().get(childPosition);
                        Toast.makeText(MenuManager.this, dataBean.getName(), Toast.LENGTH_SHORT).show();
                        return false;
                    }
                });


            }
        });
    }

    private List<ItemBean.DataBean> sendSecond(String id) {

        final List<ItemBean.DataBean> Data = new ArrayList<>();

        GetHttp.getOkHttpRequest(address, "10", "0", id, new Callback() {//Get网络请求
            @Override
            public void onFailure(Call call, IOException e) {
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {//JSON数据解析
                String responseData = response.body().string();
                Log.i("wiqu", "z" + responseData);
                ItemBean itemBean = new Gson().fromJson(responseData, ItemBean.class);
                List<ItemBean.DataBean> dataBeans = itemBean.getData();
                for (ItemBean.DataBean dataBean : dataBeans) {
                    ItemBean.DataBean mData = new ItemBean.DataBean(dataBean.getName(), dataBean.getMca(), dataBean.getColor());
                    Data.add(mData);
                }
                response.body().close();//关闭数据连接
            }
        });
        return Data;//返回数据
    }

2.ExpandableAdapter适配器的编写，继承自BaseExpandableListAdapter，重写它的方法

package com.smartgentechnology.adapter;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.Button;
import android.widget.ExpandableListView;
import android.widget.TextView;

import com.smartgentechnology.MainActivity;
import com.smartgentechnology.R;
import com.smartgentechnology.entity.ItemBean;
import com.smartgentechnology.entity.ParentExpand;

import java.util.List;
import java.util.Map;

public class ExpandableAdapter extends BaseExpandableListAdapter {
    // public String address = "http://192.168.30.89/OR/index.php/Navjson/dis/";
    List<ParentExpand.DataBean> groupString;//父级列表数据
    // List<ItemBean.DataBean> childString;//子级列表数据，装在子项数据
    Context context;//应用上下文

    public ExpandableAdapter(Context context, List<ParentExpand.DataBean> groupString) {
        this.context = context;
        this.groupString = groupString;
        Log.i("shujua", "" + groupString);
    }

    @Override
    public int getGroupCount() {//组的个数
        Log.i("groupcount", " " + groupString.size());
        return groupString.size();
    }

    /*
     * 取得指定分组的子元素数
     */
    @Override
    public int getChildrenCount(int groupPosition) {
        Log.i("fenzu", " " + groupString.size());
        return groupString.get(groupPosition).getList_child().size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        Log.i("getGruop", " " + groupString.size());
        return groupString.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        //Log.i("mingzia",""+childString.get(groupPosition).get(childPosition).getName());
        //我们这里返回一下每个item的名称，以便单击item时显示
        // = childString.get(childPosition);
        return groupString.get(groupPosition).getList_child().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) {
        GroupViewHolder groupViewHolder = null;
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.parent_item, null);
            groupViewHolder = new GroupViewHolder();
            groupViewHolder.tvTitle = (TextView) convertView.findViewById(R.id.parentlist);
            convertView.setTag(groupViewHolder);
        } else {
            groupViewHolder = (GroupViewHolder) convertView.getTag();
        }

        groupViewHolder.tvTitle.setText(groupString.get(groupPosition).getName());
        Log.i("didijiuwo", "" + groupString.get(groupPosition).getName());

        return convertView;

    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildViewHolder childViewHolder = null;
        if (childViewHolder == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.childitem, null);
            childViewHolder = new ChildViewHolder();
            childViewHolder.tvTitle = (TextView) convertView.findViewById(R.id.classify);
            childViewHolder.tvContent = (TextView) convertView.findViewById(R.id.link);
            childViewHolder.tvColor = (TextView) convertView.findViewById(R.id.color);
            convertView.setTag(childViewHolder);
        } else {
            childViewHolder = (ChildViewHolder) convertView.getTag();
        }
        Log.i("teammess", groupPosition + "分割" + childPosition);
        childViewHolder.tvTitle.setText(groupString.get(groupPosition).getList_child().get(childPosition).getName());
        childViewHolder.tvContent.setText(groupString.get(groupPosition).getList_child().get(childPosition).getMca());
        childViewHolder.tvColor.setText(groupString.get(groupPosition).getList_child().get(childPosition).getColor());
        Log.i("qisil", " " + groupString.get(groupPosition).getList_child().get(childPosition).getName());
        return convertView;
    }

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


    private class GroupViewHolder {
        TextView tvTitle;

    }

    private class ChildViewHolder {
        TextView tvTitle;
        TextView tvContent;
        TextView tvColor;
    }

}

补充添加： 
ExpandableListView的长按事件获取父项，子项详细id

expandableListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
                    @Override
                    public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {

//                        long packedPos = ((ExpandableListView)parent).getExpandableListPosition(position);//这些都是普通版的长按操作
//                        int groupPosition=
//                                ExpandableListView.getPackedPositionGroup(packedPos);
//                        int childPosition = ExpandableListView.getPackedPositionChild(packedPos);
//                        Log.i("groupPosition----",""+groupPosition);
//                        Log.i("childPosition----",""+childPosition);
//                        if(childPosition == -1){//长按的是父项
//                            //这里做关于父项的相关操作......
//                            Toast.makeText(MenuManager.this,"parent",Toast.LENGTH_SHORT).show();
//                        }
//                        else {//长按的是子项
//                            //这里做关于子项的相关操作.......
//                            ItemBean.DataBean dataBean = groupString.get(groupPosition).getList_child().get(childPosition);
//                            Toast.makeText(MenuManager.this,dataBean.getName(),Toast.LENGTH_SHORT).show();
//                        }
//                        return true;
                      //加强版的长按操作 （本人亲自操刀，不足之处望谅解！）
                        long packedPos = ((ExpandableListView) parent).getExpandableListPosition(position);
                        final int groupPosition =
                                ExpandableListView.getPackedPositionGroup(packedPos);
                        final int childPosition = ExpandableListView.getPackedPositionChild(packedPos);
                        final String[] item = {"修改", "删除"};
                        final AlertDialog.Builder builder = new AlertDialog.Builder(MenuManager.this);
                        builder.setTitle("请选择");

                        builder.setItems(item, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                if (item[which].equals("删除")) {
                                    if (childPosition == -1) {//长按的是父项

                                      //这里做关于父项的相关操作......

                                        ParentExpand.DataBean FdataBean = groupString.get(groupPosition);
                                        postVolley(FdataBean.getId());
                                        requestQueue.start();
                                        //Toast.makeText(MenuManager.this, FdataBean.getId(), Toast.LENGTH_SHORT).show();
                                    } else {//子项
                                        ItemBean.DataBean dataBean = groupString.get(groupPosition).getList_child().get(childPosition);
                                        postVolley(dataBean.getId());
                                        requestQueue.start();
                                      //  Toast.makeText(MenuManager.this, dataBean.getId(), Toast.LENGTH_SHORT).show();
                                        Log.i("kanbuqing",""+dataBean.getId());
                                    }


                                }
                            }
                        });
                        builder.setNegativeButton("取消", null);
                        builder.show();
                        // }
                        return true;
                    }
                });

            }
        });
    }

    private void postVolley(final String id) {//使用Volley发送网络请求
       urls = getString(R.string.menu_del);
        StringRequest request = new StringRequest(com.android.volley.Request.Method.POST, urls, new com.android.volley.Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
               //Toast.makeText(MenuManager.this,response,Toast.LENGTH_SHORT).show();
                parseNum(response);
            }
        }, new com.android.volley.Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(MenuManager.this,"网络加载失败。。。",Toast.LENGTH_SHORT).show();
            }
        }){
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String,String> map = new HashMap<>();
                map.put("id",id);
                return map;
            }
        };
           request.setTag("menu");
           requestQueue.add(request);
    }

    private void parseNum(String response) {
        AddClass addClass = new Gson().fromJson(response,AddClass.class);
        String info = addClass.getInfo();
        Toast.makeText(MenuManager.this,info,Toast.LENGTH_SHORT).show();
    }

总结：也没什么好讲的，主要还是数据一定要相关联，不然多层JSON数据解析完毕初始化时数据混乱，以及感谢超哥的帮助和参考文献：
参考文献地址：https://www.cnblogs.com/yangxiu/p/5931367.html   
这个是一个简单的ExpandableListView的例子

完毕！