Android編程開發之Spinner組件用法

本文實例講述了Android編程開發之Spinner組件用法。分享給大家供大家參考，具體如下：

Spinner組件組要用顯示一個下拉列表，在使用中需要用到適配器Adapter，下面是一個該組件的使用示例

首先是布局文件main.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="vertical" android:layout_width="fill_parent" 
 android:layout_height="fill_parent"> 
 <Spinner android:id="@+id/spinner1" android:layout_width="fill_parent" 
  android:layout_height="wrap_content" /> 
 <Spinner android:id="@+id/spinner2" android:layout_width="fill_parent" 
  android:layout_height="wrap_content" android:layout_marginTop="20dp"/>
</LinearLayout> 

由於用到simpAdapter所以要寫子項Item的布局如下 item.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="horizontal" android:layout_width="fill_parent" 
 android:layout_height="wrap_content"> 
 <ImageView android:id="@+id/ivLogo" android:layout_width="60dp" 
  android:layout_height="60dp" android:src="@drawable/icon" 
  android:paddingLeft="10dp" /> 
 <TextView android:id="@+id/tvApplicationName" android:textColor="#000" 
  android:layout_width="wrap_content" android:layout_height="fill_parent" 
  android:textSize="16dp" android:gravity="center_vertical" 
  android:paddingLeft="10dp" /> 
</LinearLayout> 

下面是代碼：

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.SimpleAdapter; 
import android.widget.Spinner; 
import android.widget.AdapterView.OnItemSelectedListener; 
public class Main extends Activity 
{ 
 @Override 
 public void onCreate(Bundle savedInstanceState) 
 { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  //獲取對象 
  Spinner spinner1 = (Spinner) findViewById(R.id.spinner1); 
  String[] applicationNames = new String[] 
  { "多功能日歷", "eoeMarket客戶端", "耐玩的重力消磚塊", "白社會", "程序終結者" }; 
  ArrayAdapter<String> aaAdapter = new ArrayAdapter<String>(this, 
    android.R.layout.simple_spinner_item, applicationNames); 
  // 將如下代碼可以使列表項帶RadioButton組件 
  // aaAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
  spinner1.setAdapter(aaAdapter); 
  Spinner spinner2 = (Spinner) findViewById(R.id.spinner2); 
  final List<Map<String, Object>> items = new ArrayList<Map<String, Object>>(); 
  Map<String, Object> item1 = new HashMap<String, Object>(); 
  item1.put("ivLogo", R.drawable.calendar); 
  item1.put("tvApplicationName", "多功能日歷"); 
  Map<String, Object> item2 = new HashMap<String, Object>(); 
  item2.put("ivLogo", R.drawable.eoemarket); 
  item2.put("tvApplicationName", "eoeMarket客戶端"); 
  items.add(item1); 
  items.add(item2); 
  SimpleAdapter simpleAdapter = new SimpleAdapter(this, items, 
    R.layout.item, new String[] 
    { "ivLogo", "tvApplicationName" }, new int[] 
    { R.id.ivLogo, R.id.tvApplicationName }); 
  spinner2.setAdapter(simpleAdapter); 
  //為Spinner2加上監聽事件 
  spinner2.setOnItemSelectedListener(new OnItemSelectedListener() 
  { 
   @Override 
   public void onItemSelected(AdapterView<?> parent, View view, 
     int position, long id) 
   { 
     new AlertDialog.Builder(view.getContext()).setTitle( 
       items.get(position).get("tvApplicationName") 
         .toString()).setIcon( 
       Integer.parseInt(items.get(position).get("ivLogo")
         .toString())).show(); 
   } 
   @Override 
   public void onNothingSelected(AdapterView<?> parent) 
   {
   } 
  }); 
 } 
}

希望本文所述對大家Android程序設計有所幫助。