Android Open Source - isidore Item List Fragment

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GNU General Public License

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Java Source Code

package com.tbardici.isidore;
//ww w  .ja v  a 2s .  c o m
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

import com.tbardici.isidore.droplet.MyDroplets;

 * @author Teo
 * A list fragment representing a list of Items. This fragment also supports
 * tablet devices by allowing list items to be given an 'activated' state upon
 * selection. This helps indicate which item is currently being viewed in a
 * {@link ItemDetailFragment}.
 * <p>
 * Activities containing this fragment MUST implement the {@link Callbacks}
 * interface.
public class ItemListFragment extends ListFragment {

   * The serialization (saved instance state) Bundle key representing the
   * activated item position. Only used on tablets.
  private static final String STATE_ACTIVATED_POSITION = "activated_position";

   * 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(String id);

   * 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() {
    public void onItemSelected(String id) {

   * Mandatory empty constructor for the fragment manager to instantiate the
   * fragment (e.g. upon screen orientation changes).
  public ItemListFragment() {

  public void onCreate(Bundle savedInstanceState) {

    DropletListAdapter adapter = new DropletListAdapter(
    // TODO: replace with a real list adapter.
    //setListAdapter(new ArrayAdapter<MyDroplets.Droplet>(getActivity(),
    //    android.R.layout.simple_list_item_activated_1,
    //, MyDroplets.ITEMS));

  public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    // Restore the previously serialized activated item position.
    if (savedInstanceState != null
        && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {

  public void onAttach(Activity 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;

  public void onDetach() {

    // Reset the active callbacks interface to the dummy implementation.
    mCallbacks = sDummyCallbacks;

  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.

  public void onSaveInstanceState(Bundle outState) {
    if (mActivatedPosition != ListView.INVALID_POSITION) {
      // Serialize and persist the activated item position.
      outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);

   * Turns on activate-on-click mode. When this mode is on, list items will be
   * given the 'activated' state when touched.
  public void setActivateOnItemClick(boolean activateOnItemClick) {
    // When setting CHOICE_MODE_SINGLE, ListView will automatically
    // give items the 'activated' state when touched.
        activateOnItemClick ? ListView.CHOICE_MODE_SINGLE
            : ListView.CHOICE_MODE_NONE);

  private void setActivatedPosition(int position) {
    if (position == ListView.INVALID_POSITION) {
      getListView().setItemChecked(mActivatedPosition, false);
    } else {
      getListView().setItemChecked(position, true);

    mActivatedPosition = position;

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