how to use simple spinner in android example

main_activity.xml

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

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:prompt="@string/spinner_prompt" />
</LinearLayout>

MainActivity.java

public class MainActivity extends Activity {

    private Spinner spinner1;

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

        spinner1 = (Spinner) findViewById(R.id.spinner1);
        List<String> list = new ArrayList<String>();
        list.add("aaaaa");
        list.add("bbbbb");
        list.add("ccccc");
        list.add("ddddd");
        list.add("eeeee");
        
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>
                     (this, android.R.layout.simple_spinner_item,list);
                     
        dataAdapter.setDropDownViewResource
                     (android.R.layout.simple_spinner_dropdown_item);
                     
        spinner1.setAdapter(dataAdapter);
         }

    }