FriendsFragment.java

package course.labs.fragmentslab;

import android.app.Activity;
import android.app.ListFragment;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class FriendsFragment extends ListFragment {

	private static final String[] FRIENDS = { "ladygaga", "msrebeccablack",
			"taylorswift13" };
	private static final String TAG = "Lab-Fragments";

	public interface SelectionListener {
		public void onItemSelected(int position);
	}

	private SelectionListener mCallback;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		// use different layout definition, depending on whether device is pre-
		// or post-honeycomb

		int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ? android.R.layout.simple_list_item_activated_1
				: android.R.layout.simple_list_item_1;

		// Set the list adapter for this ListFragment
		setListAdapter(new ArrayAdapter<String>(getActivity(), layout, FRIENDS));
	}

		
	@Override
	public void onAttach(Activity activity) {
		super.onAttach(activity);

		// Make sure that the hosting Activity has implemented
		// the SelectionListener callback interface. We need this
		// because when an item in this ListFragment is selected, 
		// the hosting Activity's onItemSelected() method will be called.
		
		try {

			mCallback = (SelectionListener) activity;

		} catch (ClassCastException e) {
			throw new ClassCastException(activity.toString()
					+ " must implement SelectionListener");
		}
	}

	// Note: ListFragments come with a default onCreateView() method.
	// For other Fragments you'll normally implement this method.
	// 	@Override
	//  public View onCreateView(LayoutInflater inflater, ViewGroup container,
	//		Bundle savedInstanceState)

	
	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);

		Log.i(TAG, "Entered onActivityCreated()");

		// When using two-pane layout, configure the ListView to highlight the
		// selected list item
		
		if (isInTwoPaneMode()) {

			getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);

		}

	}

	@Override
	public void onListItemClick(ListView l, View view, int position, long id) {

		// Notify the hosting Activity that a selection has been made.

		mCallback.onItemSelected(position);

	}

	// If there is a FeedFragment, then the layout is two-pane 
	private boolean isInTwoPaneMode() {

		return getFragmentManager().findFragmentById(R.id.feed_frag) != null;

	}

}