android學習：下拉式清單Spinner使用

package com.example.examples_04_09;import android.app.Activity;import android.os.Bundle;import android.view.Menu;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 static final String [] m_Conutries = {"O型","A型", "B型", "AB型", "其它"};private TextView m_TextView;private Spinner m_Spinner;private ArrayAdapter<String>adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);m_TextView = (TextView)findViewById(R.id.TextView1);m_Spinner = (Spinner)findViewById(R.id.Spinner1);//將可選內容與ArrayAdapter串連adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,m_Conutries);//設定下拉式清單風格adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//將adapter添加到m_Spinner中m_Spinner.setAdapter(adapter);//添加Spinner事件監聽m_Spinner.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {// TODO Auto-generated method stubm_TextView.setText("你的血型是：" + m_Conutries[arg2]);//設定顯示當前選擇的項arg0.setVisibility(View.VISIBLE);}@Overridepublic void onNothingSelected(AdapterView<?> arg0) {// TODO Auto-generated method stub}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:id="@+id/TextView1"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <Spinner         android:id="@+id/Spinner1"        android:layout_below="@id/TextView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"/></RelativeLayout>