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 provinceAdapter;
    private ArrayAdapter 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(this,android.R.layout.simple_list_item_1,province);
        spProvince.setAdapter(provinceAdapter);

	//市的适配器绑定
        cityAdapter = new ArrayAdapter(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~