Spinner的簡單級聯主要用到了二維數組~

代碼呈上：

public class MainActivity extends AppCompatActivity {    PRivate Spinner spProvince;    private Spinner spCity;    private String[] province= {"河南省","浙江省"};
    //二維數組用于根據省的選擇來相應的顯示城市    private String[][] citys= {{"鶴壁市","鄭州市","商丘市","沈丘市"},{"杭州市","寧波市"，"衢州市","溫州市"}};    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);
	//省的適配器綁定        provinceAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,province);        spProvince.setAdapter(provinceAdapter);
	//市的適配器綁定        cityAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1);        spCity.setAdapter(cityAdapter);
	//監聽省的Spinner選項的選擇        spProvince.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {            @Override            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
		//根據省的選擇i來改變市的數據                String[] city = citys[i];
		//適配器清零                cityAdapter.clear();
		//添加市的數據                cityAdapter.addAll(city);                spCity.setSelection(0);            }            @Override            public void onNothingSelected(AdapterView<?> adapterView) {            }        });    }
再來看一下布局文件：
<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>就是一個垂直的線性布局，放置兩個Spinner,一個用于顯示省，一個用于顯示城市。
ok，就這樣可以實現Spinner的簡單的級聯~