Spinner实现下拉框

大致步骤

创建布局文件

在资源文件values下面创建一个Android XML values File文件

<string-array name="city_start">

<item>北京</item>

</string-array>

创建数据

获取资源文件中的数据

this.getResources().getStringArray

找到spinner对象

设置显示文件传递数据和绑定适配器

获取显示框选择的数据

setOnItemSelectedListener

继承ArrayAdapter里面的内容

数据传递，获取外面的数据

界面显示的内容getView

下拉框里面的内容getDropDownView

完成效果图：

java源代码

package com.xiaoke.spinnershow;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {// 创建布局文件// 在资源文件values下面创建一个Android XML values File文件@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);// 创建数据// String[] start={"北京","上海","成都"};// String[] terget={"北京","上海","成都"};// 获取资源文件中的数据final String[] start = this.getResources().getStringArray(R.array.city_start);final String[] terget = this.getResources().getStringArray(R.array.city_target);// 找到spinner对象Spinner sp1 = (Spinner) findViewById(R.id.spinner_a1_id);Spinner sp2 = (Spinner) findViewById(R.id.spinner_a2_id);// 设置显示文件传递数据和绑定适配器sp1// ArrayAdapter adapter1=new ArrayAdapter(this,// android.R.layout.simple_list_item_1,android.R.id.text1, start);// sp1.setAdapter(adapter1);ArrayAdapter adapter1 = new MyAdapter(this, -1, start);sp1.setAdapter(adapter1);sp1.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {Toast.makeText(MainActivity.this, start[arg2],Toast.LENGTH_SHORT).show();}@Overridepublic void onNothingSelected(AdapterView<?> arg0) {// TODO Auto-generated method stub}});// 设置显示文件和绑定适配器sp2// ArrayAdapter adapter2=new ArrayAdapter(this,// android.R.layout.simple_list_item_1,android.R.id.text1, terget);// sp2.setAdapter(adapter2);ArrayAdapter adapter2 = new MyAdapter(this, -1, terget);sp2.setAdapter(adapter2);// 获取显示框选择的数据sp2.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {Toast.makeText(MainActivity.this, terget[arg2],Toast.LENGTH_SHORT).show();}@Overridepublic void onNothingSelected(AdapterView<?> arg0) {// TODO Auto-generated method stub}});}public class MyAdapter extends ArrayAdapter {LayoutInflater inflater = null;// 数据传递，获取外面的数据Object[] objects = null;public MyAdapter(Context context, int resource, Object[] objects) {super(context, resource, objects);inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);this.objects = objects;}@Overridepublic int getCount() {// TODO Auto-generated method stubLog.d("长度", objects.length + "");return objects.length;}// 界面显示的内容@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view = inflater.inflate(android.R.layout.simple_list_item_1,null);TextView tv = (TextView) view.findViewById(android.R.id.text1);tv.setText(objects[position] + "");return view;}// 下拉框里面的内容@Overridepublic View getDropDownView(int position, View convertView,ViewGroup parent) {View view = inflater.inflate(android.R.layout.simple_list_item_1,null);TextView tv = (TextView) view.findViewById(android.R.id.text1);tv.setText(objects[position] + "");return view;}}}

资源文件array.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string-array name="city_start">        <item>北京</item>        <item>上海</item>        <item>天津</item>        <item>成都</item>        <item>广州</item>        <item>福建</item>        <item>东莞</item>    </string-array>    <string-array name="city_target">        <item>北京</item>        <item>上海</item>        <item>天津</item>        <item>成都</item>        <item>广州</item>        <item>福建</item>        <item>东莞</item>    </string-array></resources>

布局文件

<LinearLayout 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:orientation="horizontal" >    <Spinner        android:id="@+id/spinner_a1_id"        android:layout_weight="1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"         />    <Spinner        android:id="@+id/spinner_a2_id"        android:layout_weight="1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"         /></LinearLayout>