Android Spinner 组件的应用实例

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:orientation="vertical" > 
 
  <ScrollView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" > 
 
    <LinearLayout 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" 
      android:gravity="center_horizontal" 
      android:orientation="vertical" > 
 
      <Spinner 
        android:id="@+id/spinner" 
        android:layout_width="300dp" 
        android:layout_height="wrap_content" 
        android:layout_gravity="center_vertical" /> 
 
      <TextView 
        android:id="@+id/showInfo" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:layout_marginLeft="15dp" 
        android:layout_marginRight="15dp" 
        android:gravity="center" 
        android:text=" " /> 
    </LinearLayout> 
  </ScrollView> 
 
</LinearLayout> 

  package com.example.spinnertest; 
 
import java.util.ArrayList; 
 
import android.app.Activity; 
import android.content.res.Resources; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemSelectedListener; 
import android.widget.ArrayAdapter; 
import android.widget.Spinner; 
import android.widget.TextView; 
 
public class MainActivity extends Activity { 
 
  private Spinner spinner; 
  private TextView tx; 
  private ArrayList<String> list = null; 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
 
    /* 获取TextView 实体对象 ， 用于显示星座的详细信息 */ 
    tx = (TextView) findViewById(R.id.showInfo); 
 
    /* 下拉组件测试 Spinner 对象首先获取 */ 
    spinner = (Spinner) findViewById(R.id.spinner); 
 
    /* 准备数据源 M , 用集合进行保存 */ 
    list = new ArrayList<String>();  
    list.add("Aries"); 
    list.add("Taurus"); 
    list.add("Gemini"); 
    list.add("Cancer"); 
    list.add("Leo"); 
    list.add("Virgo"); 
    list.add("Libra"); 
    list.add("Scorpio"); 
    list.add("Sagittarius"); 
    list.add("Capricorn"); 
    list.add("Aquarius"); 
    list.add("Pisces"); 
 
 
    /* 实现M 层 与C 层的关系 ,绑定数据 */ /* 参数1：上下文对象； 参数2：系统资源布局方式 ； 参数3：数据对象 */ 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, list); 
 
    /* 对V 层和C 层进行关系的绑定； */ 
    spinner.setAdapter(adapter); 
 
    spinner.setOnItemSelectedListener(new OnItemSelectedListener() { 
 
      /* 对所有的选择项进行监控 *//* 参3：当前选择项的ID 参4：被选择项在组中的位置，逻辑上与ID 相等，但代表的意义不一样 */ 
      public void onItemSelected(AdapterView<?> arg0, View arg1, 
          int id, long position) { 
        // Toast.makeText(MainActivity.this, "你选择的是第:"+id+"值为："+list.get(id), 1000).show(); 
         
        /* 设置tx对象的值 */ 
        String temp = getConstellation(id); 
        tx.setText("\t"+temp); 
 
      } 
 
      @Override 
      public void onNothingSelected(AdapterView<?> arg0) { 
        // TODO Auto-generated method stub 
 
      } 
    }); 
 
 
  } 
 
  /* 显示星座的信息 */ 
  protected String getConstellation(int id){ 
    Resources rs = getResources(); 
    String temp = ""; 
    switch(id){ 
    case 0: 
      temp = rs.getString(R.string.Aries); 
      break; 
    case 1: 
      temp = rs.getString(R.string.Taurus); 
      break; 
    case 2: 
      temp = rs.getString(R.string.Gemini); 
      break; 
    case 3: 
      temp = rs.getString(R.string.Cancer); 
      break; 
    case 4: 
      temp = rs.getString(R.string.Leo); 
      break; 
    case 5: 
      temp = rs.getString(R.string.Virgo); 
      break; 
    case 6: 
      temp = rs.getString(R.string.Libra); 
      break; 
    case 7: 
      temp = rs.getString(R.string.Scorpio); 
      break; 
    case 8: 
      temp = rs.getString(R.string.Sagittarius); 
      break; 
    case 9: 
      temp = rs.getString(R.string.Capricorn); 
      break; 
    case 10: 
      temp = rs.getString(R.string.Aquarius); 
      break; 
    case 11: 
      temp = rs.getString(R.string.Pisces); 
      break; 
    case 12: 
      temp = rs.getString(R.string.Aries); 
      break; 
    } 
    return temp; 
  } 
 
 
}