Android(安卓)UI控件Spinner控件的学习

package com.android.liu.ui;

import com.android.liu.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 SpinnerActivity extends Activity {
private static final String[] m_Countries={"A","B","AB","O","其它"};

private TextView m_TextView;
private Spinner m_Spinner;
private ArrayAdapter<String> adapter;

@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.spinner);

m_TextView=(TextView) this.findViewById(R.id.SpinnerText);
m_Spinner=(Spinner) this.findViewById(R.id.spinner);

//将可选内容与ArrayAdapter连接
adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m_Countries);
//设置列表的下拉风格
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

m_Spinner.setAdapter(adapter);

m_Spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {

m_TextView.setText("你的血型是："+m_Countries[arg2]);

//显示当前选中的项
arg0.setVisibility(View.VISIBLE);

}

@Override
public 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/SpinnerText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请选择正确答案"
></TextView>

<Spinner
android:id="@+id/spinner"
android:layout_height="wrap_content"
android:layout_width= "wrap_content"
android:layout_centerHorizontal="true"
></Spinner>

</LinearLayout>

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