针对AdapterView的拓展使用，Spinner实现省市区的三级联动，具体内容如下
其主要是通过使用Spinner的setOnItemSelectListener来实现。
代码示例：
activity_main.xml
代码语言：javascript复制<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@ id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.testspinnerprovince.MainActivity"
android:orientation="vertical"
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:text="@string/selection"
android:padding="6dp"/
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:orientation="horizontal"
<Spinner
android:id="@ id/provinceSpinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"/
<Spinner
android:id="@ id/citySpinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"/
<Spinner
android:id="@ id/countySpinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"/
</LinearLayout
<TextView
android:id="@ id/show"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:padding="6dp"
android:layout_marginTop="80dp"
android:text="@string/selected"/
</LinearLayout MainActivity.java
代码语言：javascript复制public class MainActivity extends AppCompatActivity {
private TextView show;
private Spinner provinceSpinner;//省级
private Spinner citySpinner;//市级
private Spinner countySpinner;//区级
private String[] province = new String[]{"北京","上海","天津","广东"};
private String[][] city = new String[][]{
{"东城区","西城区","崇文区","宣武区","朝阳区","海淀区","丰台区","石景山区","门头沟区",
"房山区","通州区","顺义区","大兴区","昌平区","平谷区","怀柔区","密云县","延庆县"},
{"长宁区","静安区","普陀区","闸北区","虹口区"},
{"和平区","河东区","河西区","南开区","河北区","红桥区","塘沽区","汉沽区","大港区","东丽区"},
{"广州","深圳","韶关"}};
private String[][][] county = new String[][][]{{
//北京
{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},
{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},},{
//上海
{"无"},{"无"},{"无"},{"无"},{"无"},},{
//天津
{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},},{
//广东
{"海珠区","荔湾区","越秀区","白云区","萝岗区","天河区","黄浦区","花都区","从化市","增城市"
,"番禺区","南沙区"},
{"宝安区","福田区","龙岗区","罗湖区","南山区","盐田区"},
{"武江区","浈江区","曲江区","乐昌市","南雄市","始兴县","仁化县","翁源县","新丰县","乳源县"}
}
};
//Spinner想要填充肯定需要适配器
private ArrayAdapter<String provinceAdapter;
private ArrayAdapter<String cityAdapter;
private ArrayAdapter<String countyAdapter;
private int provicePosition;//省级选中索引
private int cityPosition;//市级选中索引
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();//初始化
}
//控件初始化
private void initViews() {
provinceSpinner = (Spinner) findViewById(R.id.provinceSpinner);
citySpinner = (Spinner) findViewById(R.id.citySpinner);
countySpinner = (Spinner) findViewById(R.id.countySpinner);
show = (TextView) findViewById(R.id.show);
//初始化适配器及显示的内容
provinceAdapter = new ArrayAdapter<String (this,android.R.layout.simple_spinner_item,province);
provinceSpinner.setAdapter(provinceAdapter);
//对省级下拉实现监听，市级下拉需要根据不同的省级显示不同内容。
provinceSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<? parent, View view, int position, long id) {
//需要在item选中省级的时候，动态的改变市级对应的显示
cityAdapter = new ArrayAdapter<String (MainActivity.this,android.R.layout.simple_spinner_item,city[position]);
//设置二级下拉列表当中选项内容适配器
citySpinner.setAdapter(cityAdapter);
//记录当前的省级索引位置，留给下面修改县级进行适配使用
provicePosition = position;
}
@Override
public void onNothingSelected(AdapterView<? parent) {
}
});
//市级下拉监听
citySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<? parent, View view, int position, long id) {
//需要在item选中市级的时候，动态的改变县级对应的显示
countyAdapter = new ArrayAdapter<String (MainActivity.this,android.R.layout.simple_spinner_item,county[provicePosition][position]);//首先确定是哪个省的。
//设置二级下拉列表当中选项内容适配器
countySpinner.setAdapter(countyAdapter);
show.setText("选中的城市为:" province[provicePosition] city[provicePosition][position]);
cityPosition = position;
}
@Override
public void onNothingSelected(AdapterView<? parent) {
}
});
//区级的下拉
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<? parent, View view, int position, long id) {
show.setText("选中的城市为:" province[provicePosition] city[provicePosition][cityPosition]
county[provicePosition][cityPosition][position]);
}
@Override
public void onNothingSelected(AdapterView<? parent) {
}
});
}
}运行结果：
以上就是本文的全部内容，希望对大家的学习有所帮助。
