Android Open Source - fragments titlefrag

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License

The source code is released under:

GNU General Public License

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Java Source Code

package edu.cs4730.frag3demo;
//from   w w  w  .  j a  v a 2 s.c om
import android.support.v4.app.ListFragment;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class titlefrag extends ListFragment {
  
  /**
   * The fragment's current callback object, which is notified of list item
   * clicks.
   */
  private Callbacks mCallbacks = sDummyCallbacks;

  /**
   * The current activated item position. Only used on tablets.
   */
//  private int mActivatedPosition = ListView.INVALID_POSITION;
  
  /**
   * A callback interface that all activities containing this fragment must
   * implement. This mechanism allows activities to be notified of item
   * selections.
   */
  public interface Callbacks {
    /**
     * Callback for when an item has been selected.
     */
    public void onItemSelected(int id);
  }
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
  }

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, Shakespeare.TITLES);
    setListAdapter(adapter);
  }

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

    // Activities containing this fragment must implement its callbacks.
    if (!(activity instanceof Callbacks)) {
      throw new IllegalStateException(
          "Activity must implement fragment's callbacks.");
    }

    mCallbacks = (Callbacks) activity;
  }

  @Override
  public void onDetach() {
    super.onDetach();

    // Reset the active callbacks interface to the dummy implementation.
    mCallbacks = sDummyCallbacks;
  }
  
  /**
   * A dummy implementation of the {@link Callbacks} interface that does
   * nothing. Used only when this fragment is not attached to an activity.
   */
  private static Callbacks sDummyCallbacks = new Callbacks() {
    @Override
    public void onItemSelected(int id) {
    }
  };

  @Override
  public void onListItemClick(ListView listView, View view, int position,
      long id) {
    super.onListItemClick(listView, view, position, id);

    // Notify the active callbacks interface (the activity, if the
    // fragment is attached to one) that an item has been selected.
    mCallbacks.onItemSelected(position);
  }
}

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