Android-Spinner [使用C# And Java实现]

效果如下：

C#实现代码

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);

        }

    }

}

Java实现代码

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("兰州");

        _cityInfo.add("武汉");

        _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

<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>