<LinearLayout 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:orientation="vertical" >
<Spinner 
     android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:entries="@array/books"
    android:prompt="@string/tip"
    />    
    <Spinner 
        android:id="@+id/spinner"
     android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:prompt="@string/tip"
    />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="books">
        <item>java</item>
        <item>android</item>
        <item>web</item>
    </string-array>
</resources>

package com.example.spinner;


import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends Activity {

    Spinner spinner;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        spinner=(Spinner) findViewById(R.id.spinner);
        String[] arr={"孙悟空","猪八戒","唐僧"};
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_multiple_choice, arr);
        spinner.setAdapter(adapter);
    }
}