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：

<?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：
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.id.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) {

}
});

}
}