Simple FragmentActivity

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//mainactivity.java

public class MainActivity extends FragmentActivity implements UiListener{
	private MainFragment fragment;
	@Override
	protected void onCreate(Bundle arg0) {
		super.onCreate(arg0);
		setContentView(R.layout.activity_main);
		fragment = (MainFragment) getSupportFragmentManager().findFragmentById(R.id.main_fragment);
        }
        public void onButtonClicked(){
              // handle button clicked
        }
}

//layout/activity_main.xml
/*
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <fragment android:name="MainFragment"
        android:id="@+id/main_fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</RelativeLayout>
*/

//mainfragment.java

public class MainFragment extends Fragment {

	public interface UiListener{
		public void onButtonClicked();
	}
	
	private UiListener uiCallback;
	
	@Override
	public void onAttach(Activity activity) {		
		super.onAttach(activity);		
		try{
			uiCallback = (UiListener) activity; // check if the interface is implemented
		}catch(ClassCastException e){
			e.printStackTrace();
		}
	}
	
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		return inflater.inflate(R.layout.fragment_main, container, false);
	}
	
	@Override
	public void onViewCreated(View view, Bundle savedInstanceState) {
		super.onViewCreated(view, savedInstanceState);
				
		view.findViewById(R.id.button).setOnClickListener(new OnClickListener() {			
			@Override
			public void onClick(View v) {
				onButtonClicked();
			}
		});
    }
}

//layout/fragment_main.xml
/*
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="5dp" >    
    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Click me!" />
</RelativeLayout>
*/