Android下拉式清單（Spinner）效果

Android下拉式清單（Spinner）效果

          這篇文章主要介紹了Android下拉式清單（Spinner）效果（使用C#和Java分別實現）,本文直接給出和兩種語言的實現代碼及布局代碼,需要的朋友可以參考下

 

 

效果如下：

C#實現代碼

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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("蘭州"); _cityInfos.Add("武漢"); _cityInfos.Add("上海"); _citySpinner.Adapter = _cityInfos; _citySpinner.ItemSelected += CitySelectedEvent; }   private void CitySelectedEvent(object sender, AdapterView.ItemSelectedEventArgs e) { _cityNameView.Text = _cityInfos.GetItem(e.Position); } } }

Java實現代碼

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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; @Override protected 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("蘭州"); _cityInfo.add("武漢"); _cityInfo.add("上海"); _citySpinner.setAdapter(_cityInfo); _citySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { _cityNameView.setText(_cityInfo.getItem(position)); }   @Override public void onNothingSelected(AdapterView<?> parent) {   } }); } }

LayOut

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<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">   <Spinner android: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" /> <TextView android: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>