安卓之高级控件Spinner下拉框

Spinner控件下拉框运用在地址的二级联动中

效果如图：

XML关键代码：

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical" android:layout_width="match_parent"  
4.     android:layout_height="match_parent">  
5.   
6.   
7.     <Spinner  
8.         android:layout_width="wrap_content"  
9.         android:layout_height="wrap_content"  
10.         android:id="@+id/s_main_province"></Spinner>  
11.     <Spinner  
12.         android:layout_width="wrap_content"  
13.         android:layout_height="wrap_content"  
14.         android:id="@+id/s_main_city"></Spinner>  
15.   
16.   
17. </LinearLayout>  

Java关键代码：

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1. public class MainActivity extends AppCompatActivity {  
2.   
3.     private Spinner s_main_province;  
4.     private Spinner s_main_city;  
5.     private List<String> province;  
6.     int index=0;  
7.     private SimpleAdapter sadapter;  
8.     private ArrayAdapter cityAdapter;  
9.   
10.   
11.     @Override  
12.     protected void onCreate(Bundle savedInstanceState) {  
13.         super.onCreate(savedInstanceState);  
14.         setContentView(R.layout.activity_main);  
15.   
16.         s_main_province = (Spinner) findViewById(R.id.s_main_province);  
17.         s_main_city = (Spinner) findViewById(R.id.s_main_city);  
18.         //设置省份下拉列表的适配器  
19.         province=new ArrayList<>();  
20.         province.add("湖南省")  ;  
21.         province.add("湖北省");  
22.         province.add("甘肃省");  
23.         //设置图片集合  
24.         List<Integer> images=new ArrayList<>();  
25.         images.add(R.drawable.bird);  
26.         images.add(R.drawable.cat);  
27.         images.add(R.drawable.cow);  
28.   
29.          List<Map<String,Object>> lists=new ArrayList<>();  
30.         for (int i = 0; i < province.size(); i++) {  
31.             Map<String,Object> map=new HashMap<>();  
32.            map.put("province",province.get(i));  
33.             map.put("images",images.get(i));  
34.             lists.add(map);  
35.         }  
36.   
37.         //设置市的集合  
38.         String city1[]={"长沙市","湘潭市","衡阳市"};  
39.         String city2[]={"武汉市","黄石市","襄阳市"};  
40.         String city3[]={"兰州","白银市","平凉市"};  
41.   
42.       final String str[][]={city1,city2,city3};  
43.         //省域市集合  
44.        final Map<String ,String[]> cityLists=new ArrayMap<>();  
45.         for (int i = 0; i <province.size() ; i++) {  
46.             cityLists.put(province.get(i),str[i]);  
47.         }  
48.         sadapter = new SimpleAdapter(this,lists,android.R.layout.activity_list_item,new String[]{"province","images"},new int[]{android.R.id.text1,android.R.id.icon});  
49.         //给下拉列表设置适配器  
50.         s_main_province.setAdapter(sadapter);  
51.        s_main_province.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {  
52.            @Override  
53.            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {  
54.                //给市的下拉框设置配置器  
55.                index=position;  
56.                cityAdapter=new ArrayAdapter(MainActivity.this,android.R.layout.simple_list_item_1,cityLists.get(province.get(index)));  
57.                s_main_city.setAdapter(cityAdapter);  
58.   
59.            }  
60.   
61.            @Override  
62.            public void onNothingSelected(AdapterView<?> parent) {  
63.   
64.            }  
65.        });  
66.   
67.   
68.   
69.   
70.   
71.   
72.     }  
73. }