Spinner三级联动，解析JSON省 市 区,超简单一步搞定

package com.example.hitman.three_leveldemo;

import android.content.res.Resources;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private Spinner province_spinner;
    private Spinner city_spinner;
    private Spinner county_spinner;

    //省市区
    private List shengji = new ArrayList<>();
    private List chengshi = new ArrayList<>();
    private List quyu = new ArrayList<>();


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

    private void info() {

        province_spinner = (Spinner) this.findViewById(R.id.province_spinner);
        city_spinner = (Spinner) this.findViewById(R.id.city_spinner);
        county_spinner = (Spinner) this.findViewById(R.id.county_spinner);
        //========================================================================

        Resources resources = getResources();
        String[] province = resources.getStringArray(R.array.province_item);
        shengji = Arrays.asList(province);
        ArrayAdapter adapterProvince = new ArrayAdapter(MainActivity.this, R.layout.item_spinner, R.id.putxt, shengji);
        province_spinner.setAdapter(adapterProvince);
        //========================================================================

        //循环省级
        province_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView adapterView, View view, int i, long l) {
                loadSpinner();
            }
            @Override
            public void onNothingSelected(AdapterView adapterView) {

            }
        });

    }


    //解析json
    public void loadSpinner(){
        try {
            InputStreamReader isr = new InputStreamReader(getAssets().open("china.json"),"UTF-8");
            BufferedReader br = new BufferedReader(isr);
            String line;
            StringBuilder builder = new StringBuilder();
            while((line = br.readLine()) != null){
                builder.append(line);
            }
            br.close();
            isr.close();
            JSONObject json = new JSONObject(builder.toString());//builder读取了JSON中的数据。
            String selectedItem = (String) province_spinner.getSelectedItem();
            JSONArray jsonArray = json.getJSONArray(selectedItem);
            chengshi.clear();

            for (int i=0;ifinal JSONObject jsonObject = jsonArray.getJSONObject(i);
                for (Iterator iterator = jsonObject.keys(); iterator.hasNext();) {
                    String key = iterator.next();
                    chengshi.add(key);
                }
                ArrayAdapter adapter = new ArrayAdapter(MainActivity.this,R.layout.item_spinner, R.id.putxt,chengshi);
                city_spinner.setAdapter(adapter);

                city_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    @Override
                    public void onItemSelected(AdapterView adapterView, View view, int i, long l) {
                        quyu.clear();
                        String chensg = (String) city_spinner.getSelectedItem();
//                            System.out.println("城市");
                        try {
                            JSONArray jsonObject1 = jsonObject.getJSONArray(chensg);
                            for (int f=0;f//                                        System.out.println("区"+o);
                                quyu.add(o);
                            }

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                        ArrayAdapter adapters = new ArrayAdapter(MainActivity.this,R.layout.item_spinner, R.id.putxt,quyu);
                        county_spinner.setAdapter(adapters);

                    }

                    @Override
                    public void onNothingSelected(AdapterView adapterView) {

                    }
                });



            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

//----------------XML  activity_main.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.hitman.three_leveldemo.MainActivity">

    <LinearLayout
        android:layout_marginLeft="21dp"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="50dip"
        android:id="@+id/linearLayout5">

        <Spinner
            android:paddingTop="0dip"
            android:paddingBottom="0dip"
            android:layout_width="0dip"
            android:layout_weight="1"
            android:layout_height="50dip"
            android:id="@+id/province_spinner">

        Spinner>

        <Spinner
            android:paddingTop="0dip"
            android:paddingBottom="0dip"
            android:layout_width="0dip"
            android:layout_height="50dip"
            android:id="@+id/city_spinner"
            android:layout_weight="1">

        Spinner>

        <Spinner
            android:paddingTop="0dip"
            android:paddingBottom="0dip"
            android:layout_width="0dip"
            android:layout_height="50dip"
            android:id="@+id/county_spinner"
            android:layout_weight="1">

        Spinner>
    LinearLayout>
RelativeLayout>

//---Spinner样式xml item_spinner.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    
<TextView
    android:layout_width="match_parent"
    android:layout_height="40sp"
    android:gravity="center"
    android:text=" "
    android:id="@+id/putxt"
    />
    <TextView
        android:layout_width="300sp"
        android:layout_height="1sp"
        android:background="@color/colorPrimaryDark"
        android:layout_below="@+id/putxt"
        android:layout_centerHorizontal="true" />

RelativeLayout>

//---json放在assets下