首页 / 移动开发 / Android / Android下拉列表（Spinner）效果（使用C#和Java分别实现）

using Android.App;using Android.OS;using Android.Widget;namespace SpinnerDemo{[Activity（Label = "@string/ApplicationName", MainLauncher = true, Icon = "@drawable/icon"）]public class MainActivity : Activity{private Spinner _citySpinner;private TextView _cityNameView;private ArrayAdapter<string> _cityInfos; protected override void OnCreate（Bundle bundle）{base.OnCreate（bundle）;SetContentView（Resource.Layout.Main）;_citySpinner = FindViewById<Spinner>（Resource.Id.sp_city）;_cityNameView = FindViewById<TextView>（Resource.Id.txt_cityName）;_cityInfos = new ArrayAdapter<string>（this, Android.Resource.Layout.SimpleSpinnerDropDownItem）;_cityInfos.Add（"成都"）;_cityInfos.Add（"兰州"）;_cityInfos.Add（"武汉"）;_cityInfos.Add（"上海"）;_citySpinner.Adapter = _cityInfos;_citySpinner.ItemSelected += CitySelectedEvent;}private void CitySelectedEvent（object sender, AdapterView.ItemSelectedEventArgs e）{_cityNameView.Text = _cityInfos.GetItem（e.Position）;}}}

package com.example.halower.spinnerdemo;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.TextView;public class MainActivity extends ActionBarActivity {private Spinner _citySpinner;private TextView _cityNameView;private ArrayAdapter<String> _cityInfo;@Overrideprotected void onCreate（Bundle savedInstanceState） {super.onCreate（savedInstanceState）;setContentView（R.layout.activity_main）;_citySpinner =（Spinner）findViewById（R.id.sp_city）;_cityNameView =（TextView） findViewById（R.id.txt_cityName）;_cityInfo =new ArrayAdapter<>（this,R.layout.support_simple_spinner_dropdown_item）;_cityInfo.add（"成都"）;_cityInfo.add（"兰州"）;_cityInfo.add（"武汉"）;_cityInfo.add（"上海"）;_citySpinner.setAdapter（_cityInfo）;_citySpinner.setOnItemSelectedListener（new AdapterView.OnItemSelectedListener（） {@Overridepublic void onItemSelected（AdapterView<?> parent, View view, int position, long id） {_cityNameView.setText（_cityInfo.getItem（position））;}@Overridepublic void onNothingSelected（AdapterView<?> parent） {}}）;}}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"><Spinnerandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/sp_city"android:layout_alignParentTop="true"android:layout_alignParentRight="true"android:layout_alignParentEnd="true"android:layout_toEndOf="@+id/txt_cityName"android:layout_toRightOf="@+id/txt_cityName" /><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="城市"android:id="@+id/txt_cityName"android:layout_alignParentLeft="true"android:layout_alignParentStart="true" /></RelativeLayout>