package com.lxt008;import com.lxt008.R;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;public class Activity01 extends Activity
{private static final String[]    m_Countries    = { "O型", "A型", "B型", "AB型", "其他" };private TextView                m_TextView;private Spinner                    m_Spinner;private ArrayAdapter<String>    adapter;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);m_TextView = (TextView) findViewById(R.id.TextView1);m_Spinner = (Spinner) findViewById(R.id.Spinner1);//将可选内容与ArrayAdapter连接adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, m_Countries);//设置下拉列表的风格
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//将adapter添加到m_Spinner中
        m_Spinner.setAdapter(adapter);//添加Spinner事件监听m_Spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3){m_TextView.setText("你的血型是：" + m_Countries[arg2]);//设置显示当前选择的项
                arg0.setVisibility(View.VISIBLE);}@Overridepublic void onNothingSelected(AdapterView<?> arg0){// TODO Auto-generated method stub
            }});}
}

<?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">
<TextView  android:id="@+id/TextView1"android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello"/>
<Spinnerandroid:id="@+id/Spinner1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"
/>
</LinearLayout>