省市区三级联动

  1 package com.example.homeworkday04_2;
  2 
  3 import java.util.ArrayList;
  4 import java.util.HashMap;
  5 import java.util.LinkedHashMap;
  6 import java.util.List;
  7 import java.util.Map;
  8 
  9 import android.os.Bundle;
 10 import android.R.string;
 11 import android.app.Activity;
 12 import android.util.Log;
 13 import android.view.View;
 14 import android.widget.AdapterView;
 15 import android.widget.AdapterView.OnItemSelectedListener;
 16 import android.widget.ArrayAdapter;
 17 import android.widget.Spinner;
 18 
 19 public class MainActivity extends Activity {
 20     private Spinner provinceSpinner = null; // 省级（省、直辖市）
 21     private Spinner citySpinner = null; // 地级市
 22     private Spinner countySpinner = null; // 县级（区、县、县级市）
 23     ArrayAdapter<String> provinceAdapter = null; // 省级适配器
 24     ArrayAdapter<String> cityAdapter = null; // 地级适配器
 25     ArrayAdapter<String> countyAdapter = null; // 县级适配器
 26     private Map<String, Map<String, ArrayList<String>>> map = new HashMap<String, Map<String, ArrayList<String>>>();
 27     Map<String, ArrayList<String>> map2 = new HashMap<String, ArrayList<String>>();
 28     Map<String, ArrayList<String>> map3 = new HashMap<String, ArrayList<String>>();
 29 
 30     protected void onCreate(Bundle savedInstanceState) {
 31         super.onCreate(savedInstanceState);
 32         setContentView(R.layout.activity_main);
 33         ArrayList<String> counties = new ArrayList<String>();
 34         counties.add("郑州a区");
 35         counties.add("郑州b区");
 36         counties.add("郑州c区");
 37         map2.put("郑州", counties);
 38         ArrayList<String> counties1 = new ArrayList<String>();
 39         counties1.add("洛阳a区");
 40         counties1.add("洛阳b区");
 41         counties1.add("洛阳c区");
 42         map2.put("洛阳", counties1);
 43         map.put("河南", map2);
 44         ArrayList<String> counties2 = new ArrayList<String>();
 45         counties2.add("保定a区");
 46         counties2.add("保定b区");
 47         counties2.add("保定c区");
 48         map3.put("保定", counties2);
 49         ArrayList<String> counties3 = new ArrayList<String>();
 50         counties3.add("石家庄a区");
 51         counties3.add("石家庄b区");
 52         counties3.add("石家庄区c");
 53         map3.put("石家庄", counties3);
 54         map.put("河北", map3);
 55         provinceSpinner = (Spinner) findViewById(R.id.spinner1);
 56         citySpinner = (Spinner) findViewById(R.id.spinner2);
 57         countySpinner = (Spinner) findViewById(R.id.spinner3);
 58         // 省市联动
 59         List<String> provicesList = new ArrayList<String>(map.keySet());
 60         provinceAdapter = new ArrayAdapter<String>(this,
 61                 android.R.layout.simple_spinner_item, provicesList);
 62         provinceSpinner.setAdapter(provinceAdapter);
 63         provinceSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
 64 
 65             @Override
 66             public void onItemSelected(AdapterView<?> parent, View view,
 67                     int position, long id) {
 68                 // TODO Auto-generated method stub
 69                 String string = (String) parent.getItemAtPosition(position);
 70                 map2 = map.get(string);// 获得市县级联动map 这里可以重写一个map 因为省市的原因就拿来用了
 71                                         // 他把原来的 覆盖了
 72                 List<String> cityList = new ArrayList<String>(map2.keySet());// 或得市列表
 73                 cityAdapter = new ArrayAdapter<String>(MainActivity.this,
 74                         android.R.layout.simple_spinner_item, cityList);
 75                 citySpinner.setAdapter(cityAdapter);
 76 
 77             }
 78 
 79             @Override
 80             public void onNothingSelected(AdapterView<?> parent) {
 81                 // TODO Auto-generated method stub
 82 
 83             }
 84         });
 85         // 市县级联动监听
 86         citySpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
 87 
 88             @Override
 89             public void onItemSelected(AdapterView<?> parent, View view,
 90                     int position, long id) {
 91                 // TODO Auto-generated method stub
 92                 String string = (String) parent.getItemAtPosition(position);
 93                 System.out.println(string);
 94                 List<String> countylList = map2.get(string);
 95                 System.out.println(countylList.toString());
 96 
 97                 countyAdapter = new ArrayAdapter<String>(MainActivity.this,
 98                         android.R.layout.simple_spinner_item, countylList);
 99                 countySpinner.setAdapter(countyAdapter);
100 
101             }
102 
103             @Override
104             public void onNothingSelected(AdapterView<?> parent) {
105                 // TODO Auto-generated method stub
106 
107             }
108         });
109 
110     }
111 
112 }