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Spinner on selection listener

package app.test; 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.Toast; public class Test extends Activity {   String[] presidents;   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);     presidents = getResources().getStringArray(R.array.presidents_array);     Spinner s1 = (Spinner) findViewById(R.id.spinner1);     ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,         android.R.layout.simple_spinner_dropdown_item, presidents);     s1.setAdapter(adapter);     s1.setOnItemSelectedListener(new OnItemSelectedListener() {       @Override       public void onItemSelected(AdapterView<?> arg0, View arg1,           int arg2, long arg3) {         int index = arg0.getSelectedItemPosition();         Toast.makeText(getBaseContext(),             "You have selected item : " + presidents[index],             Toast.LENGTH_SHORT).show();       }       @Override       public void onNothingSelected(AdapterView<?> arg0) {       }     });   } } //main.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     >      <Spinner          android:id="@+id/spinner1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:drawSelectorOnTop="true" />              </LinearLayout> //strings.xml <?xml version="1.0" encoding="utf-8"?> <resources>     <string name="hello">Hello World, MainActivity!</string>     <string name="app_name">BasicViews5</string>     <string-array name="presidents_array">         <item>Dwight D. Eisenhower</item>         <item>John F. Kennedy</item>         <item>Lyndon B. Johnson</item>         <item>Richard Nixon</item>         <item>Gerald Ford</item>         <item>Jimmy Carter</item>         <item>Ronald Reagan</item>         <item>George H. W. Bush</item>         <item>Bill Clinton</item>         <item>George W. Bush</item>         <item>Barack Obama</item>     </string-array> </resources>