Android编程开发之Spinner组件用法

本文实例讲述了Android编程开发之Spinner组件用法。分享给大家供大家参考，具体如下：

Spinner组件组要用显示一个下拉列表，在使用中需要用到适配器Adapter，下面是一个该组件的使用示例

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>

由于用到simpAdapter所以要写子项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>

下面是代码：

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);
  //获取对象
  Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);
  String[] applicationNames = new String[]
  { "多功能日历", "eoeMarket客户端", "耐玩的重力消砖块", "白社会", "程序终结者" };
  ArrayAdapter<String> aaAdapter = new ArrayAdapter<String>(this,
    android.R.layout.simple_spinner_item, applicationNames);
  // 将如下代码可以使列表项带RadioButton组件
  // 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", "多功能日历");
  Map<String, Object> item2 = new HashMap<String, Object>();
  item2.put("ivLogo", R.drawable.eoemarket);
  item2.put("tvApplicationName", "eoeMarket客户端");
  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);
  //为Spinner2加上监听事件
  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)
   {
   }
  });
 }
}

希望本文所述对大家Android程序设计有所帮助。