1:activity_main.xml

<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" >

<Spinner

android:id="@+id/spinner"

android:layout_width="match_parent"

android:layout_height="wrap_content"/>

</RelativeLayout>

2:res/values/cities.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

<string-array name="cities">

<item>Beijing</item>

<item>Shanghai</item>

<item>Guangzhou</item>

</string-array>

</resources>

3:MainActivity.java

public class MainActivity extends Activity {

private Spinner spinner=null;

private ArrayAdapter<CharSequence> adapter=null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

spinner=(Spinner)findViewById(R.id.spinner);

adapter=ArrayAdapter.createFromResource(this, R.array.cities,

android.R.layout.simple_spinner_item);

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

spinner.setAdapter(adapter);

}

}