Spinner实现简单级联

Spinner的简单级联主要用到了二维数组~

代码呈上：

public class MainActivity extends AppCompatActivity {    PRivate Spinner spProvince;    private Spinner spCity;    private String[] province= {"河南省","浙江省"};
    //二维数组用于根据省的选择来相应的显示城市    private String[][] citys= {{"鹤壁市","郑州市","商丘市","沈丘市"},{"杭州市","宁波市"，"衢州市","温州市"}};    private ArrayAdapter<String> provinceAdapter;    private ArrayAdapter<String> cityAdapter;
    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        spProvince = (Spinner) findViewById(R.id.spProvince);        spCity = (Spinner) findViewById(R.id.spCity);
	//省的适配器绑定        provinceAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,province);        spProvince.setAdapter(provinceAdapter);
	//市的适配器绑定        cityAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1);        spCity.setAdapter(cityAdapter);
	//监听省的Spinner选项的选择        spProvince.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {            @Override            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
		//根据省的选择i来改变市的数据                String[] city = citys[i];
		//适配器清零                cityAdapter.clear();
		//添加市的数据                cityAdapter.addAll(city);                spCity.setSelection(0);            }            @Override            public void onNothingSelected(AdapterView<?> adapterView) {            }        });    }
再来看一下布局文件：
<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"    android:orientation="vertical"    tools:context="com.shen.fourth.MainActivity">    <Spinner        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/spProvince"        />    <Spinner        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/spCity"/></LinearLayout>就是一个垂直的线性布局，放置两个Spinner,一个用于显示省，一个用于显示城市。
ok，就这样可以实现Spinner的简单的级联~