Android下拉列表

下拉的Spinner  这里的order 是value里面的name熟悉的值

android:entries="@array/order"

这个是个重点 需要创建一个rgb_order.xml 名字可以随意

 

<Spinner
            android:id="@+id/spinner"
            android:layout_width="86dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:entries="@array/order"/>

 

android:entries="@array/order" 这里的order是string-array name的值

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string-array name="order">
        <item>红灯升序</item>
        <item>绿灯降序</item>
        <item>黄灯升序</item>
    </string-array>
</resources>

public class RgbActivity  extends AppCompatActivity {

    

    private Spinner spinner;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rgb);



        listView=(ListView) findViewById(R.id.lv_list);
        spinner=(Spinner) findViewById(R.id.spinner);

        spinner.setOnItemSelectedListener(new SpinnerSelectedListener());

    }

    private class SpinnerSelectedListener implements AdapterView.OnItemSelectedListener{

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

            //获取内容
            String select=parent.getItemAtPosition(position).toString();
            Log.i("灯",select);

            switch (select){
                case "红灯升序":
                    System.out.println("排序"+select);

                    break;
                case  "绿灯降序":
                    System.out.println("绿灯"+select);
                    break;
                default:
                    System.out.println("完毕");
                    break;
            }


//            switch ((int) select){
//                case 0:
//                    System.out.println("排序"+select);
//
//                    break;
//                case  1:
//                    System.out.println("绿灯"+select);
//                    break;
//                default:
//                    System.out.println("完毕");
//                    break;
//            }
        }

        
}