<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;
}
}