Spinner的用法实现

界面上只有一个textview和一个spinner，实现下拉列表框。

spinner.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dip"
        android:layout_marginRight="15dip"
        android:textSize="25dip"
        />

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

</LinearLayout>

SpinnerTest.java：

package com.example.wenandroid;

import android.app.Activity;
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 SpinnerTest extends Activity {
private static final String m[]={"A型","B型","O型","AB型","其他"};
private TextView textview;
private Spinner spinner;
private ArrayAdapter<String> adapter; 
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.spinner);
		textview=(TextView)findViewById(R.id.textView);
		spinner=(Spinner)findViewById(R.id.spinner);
		adapter=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, m);
		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		spinner.setAdapter(adapter);
		spinner.setOnItemSelectedListener(new OnItemSelectedListener()
		{

			@Override
			public void onItemSelected(AdapterView<?> arg0, View arg1,
					int arg2, long arg3) {
				// TODO Auto-generated method stub
				textview.setText("您的血型是："+m[arg2]);
			}

			@Override
			public void onNothingSelected(AdapterView<?> arg0) {
				// TODO Auto-generated method stub
				
			}
			
		});
		
	}

}

运行结果如下：