android spinner下拉框组件使用

下拉框是经常使用的一个组件，下面是使用的代码：

<?xml version="1.0" encoding="utf-8"?><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:background="#eee"    tools:context="com.example.wuxueyou.myfirstandroidapplication.MainActivity">    <Spinner        android:id="@+id/spinner1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:entries="@array/books"        android:prompt="@string/tip"></Spinner>    <Spinner        android:id="@+id/spinner2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:prompt="@string/tip"        android:paddingTop="20dp"        android:layout_below="@+id/spinner1"></Spinner></RelativeLayout>

package com.example.wuxueyou.myfirstandroidapplication;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ArrayAdapter;import android.widget.Spinner;public class MainActivity extends AppCompatActivity {    private static final String TAG = "MainActivity";    private Spinner spinner;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        spinner = (Spinner)this.findViewById(R.id.spinner2);        String[] arr = new String[]{                "aaa",                "bbb",                "ccc"        };        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_multiple_choice,arr);        spinner.setAdapter(arrayAdapter);    }}

string.xml

<resources>    <string name="app_name">MyFirstAndroidApplication</string>    <string-array name="books">        <item>《暗时间》</item>        <item>《暗时间1》</item>        <item>《暗时间2》</item>        <item>《暗时间3》</item>    </string-array>    <string name="tip">提示</string></resources>

运行效果：