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

Java关键代码：

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public class MainActivity extends AppCompatActivity {  
  
    private Spinner s_main_province;  
    private Spinner s_main_city;  
    private List<String> province;  
    int index=0;  
    private SimpleAdapter sadapter;  
    private ArrayAdapter cityAdapter;  
  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
  
        s_main_province = (Spinner) findViewById(R.id.s_main_province);  
        s_main_city = (Spinner) findViewById(R.id.s_main_city);  
        //设置省份下拉列表的适配器  
        province=new ArrayList<>();  
        province.add("湖南省")  ;  
        province.add("湖北省");  
        province.add("甘肃省");  
        //设置图片集合  
        List<Integer> images=new ArrayList<>();  
        images.add(R.drawable.bird);  
        images.add(R.drawable.cat);  
        images.add(R.drawable.cow);  
  
         List<Map<String,Object>> lists=new ArrayList<>();  
        for (int i = 0; i < province.size(); i++) {  
            Map<String,Object> map=new HashMap<>();  
           map.put("province",province.get(i));  
            map.put("images",images.get(i));  
            lists.add(map);  
        }  
  
        //设置市的集合  
        String city1[]={"长沙市","湘潭市","衡阳市"};  
        String city2[]={"武汉市","黄石市","襄阳市"};  
        String city3[]={"兰州","白银市","平凉市"};  
  
      final String str[][]={city1,city2,city3};  
        //省域市集合  
       final Map<String ,String[]> cityLists=new ArrayMap<>();  
        for (int i = 0; i <province.size() ; i++) {  
            cityLists.put(province.get(i),str[i]);  
        }  
        sadapter = new SimpleAdapter(this,lists,android.R.layout.activity_list_item,new String[]{"province","images"},new int[]{android.R.id.text1,android.R.i
9f2e
d.icon});  
        //给下拉列表设置适配器  
        s_main_province.setAdapter(sadapter);  
       s_main_province.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {  
           @Override  
           public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {  
               //给市的下拉框设置配置器  
               index=position;  
               cityAdapter=new ArrayAdapter(MainActivity.this,android.R.layout.simple_list_item_1,cityLists.get(province.get(index)));  
               s_main_city.setAdapter(cityAdapter);  
  
           }  
  
           @Override  
           public void onNothingSelected(AdapterView<?> parent) {  
  
           }  
       });  
  
  
  
  
  
  
    }  
}