Android Open Source - android-todo-list Todo List Fragment

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License

The source code is released under:

MIT License

Java Source Code

/* The MIT License (MIT)
 * //  www. j a  va  2  s . c om
 * Copyright (c) 2014 Stephen Just
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package ca.stephenjust.todolist;

import ca.stephenjust.todolist.data.TodoContainer;
import ca.stephenjust.todolist.data.TodoList;
import android.os.Bundle;
import android.app.ListFragment;
import android.app.LoaderManager;
import android.content.AsyncTaskLoader;
import android.content.Context;
import android.content.Loader;
import android.util.Log;
import android.util.SparseBooleanArray;
import android.view.ActionMode;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AbsListView.MultiChoiceModeListener;
import android.widget.ListView;


/**
 * A fragment representing a list of Items.
 * 
 * Activities containing this fragment MUST implement the {@link LoaderCallbacks}
 * interface.
 */
public class TodoListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<TodoList> {

  private static final String ARG_LIST = "list";
  private static final String ARG_ARCHIVE_LIST = "archive_list";

  // File names for serialized lists
  private String m_listName;
  private String m_archiveListName;

  private TodoList m_list;

  private ActionMode mActionMode;
  private MultiChoiceModeListener m_actionModeListener;

  /**
   * Create list fragment.
   * 
   * If archive_list is null, then the user will not be able to archive
   * items in that list.
   * @param list
   * @param archive_list
   * @return
   */
  public static TodoListFragment newInstance(String list, String archive_list) {
    TodoListFragment fragment = new TodoListFragment();
    Bundle args = new Bundle();
    args.putString(ARG_LIST, list);
    args.putString(ARG_ARCHIVE_LIST, archive_list);
    fragment.setArguments(args);
    return fragment;
  }

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

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

    if (getArguments() != null) {
      m_listName = getArguments().getString(ARG_LIST);
      m_archiveListName = getArguments().getString(ARG_ARCHIVE_LIST);
    }

    m_actionModeListener = new TodoSelectListener();
  }
  
  @Override
  public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    // Set up list view.
    ListView listView = getListView();
    listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
    listView.setMultiChoiceModeListener(m_actionModeListener);
    listView.clearChoices();
    // Show loading spinner.
    setListShown(false);
    // Trigger async loading of items.
    getLoaderManager().initLoader(0, null, this).forceLoad();
  }
  
  @Override
  public void onPause() {
    super.onPause();
    finishActionMode();
  }

  /**
   * This interface must be implemented by activities that contain this
   * fragment to allow an interaction in this fragment to be communicated to
   * the activity and potentially other fragments contained in that activity.
   * <p>
   * See the Android Training lesson <a href=
   * "http://developer.android.com/training/basics/fragments/communicating.html"
   * >Communicating with Other Fragments</a> for more information.
   */
  public interface OnFragmentInteractionListener {
    public void onFragmentInteraction(Bundle bundle);
  }

  /**
   * Get list of items
   * @return List of items shown by this fragment
   */
  public TodoList getTodoList() {
    if (m_list == null) {
      m_list = TodoContainer.getInstance().getList(getActivity(), m_listName);
    }
    return m_list;
  }

  @Override
  public Loader<TodoList> onCreateLoader(int id, Bundle args) {
    return new TodoListLoader(getActivity(), m_listName);
  }

  @Override
  public void onLoadFinished(Loader<TodoList> loader, TodoList data) {
    m_list = data;
    Log.d("TodoLoader", "Loaded " + m_list.size() + " items.");
    TodoAdapter adapter = TodoContainer.getInstance().getAdapter(getActivity(), m_listName);
    setListAdapter(adapter);
    
        // The list should now be shown.
        if (isResumed()) {
            setListShown(true);
        } else {
            setListShownNoAnimation(true);
        }
        
  }

  @Override
  public void onLoaderReset(Loader<TodoList> loader) {
    setListAdapter(null);
  }

  /**
   * End action mode if set on this fragment
   */
  public void finishActionMode() {
    if (mActionMode != null) {
      mActionMode.finish();
    }
  }
  
  private static class TodoListLoader extends AsyncTaskLoader<TodoList> {

    Context mContext;
    String mListFile;
    
    public TodoListLoader(Context context, String listFile) {
      super(context);
      mContext = context;
      mListFile = listFile;
    }

    @Override
    public TodoList loadInBackground() {
      return TodoContainer.getInstance().getList(mContext, mListFile);
    }

  }

  /**
   * Listener to handle selection of multiple items.
   * @author Stephen Just
   */
  class TodoSelectListener implements MultiChoiceModeListener {

    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
      if (mActionMode != null) return false;
      mActionMode = mode;
      MenuInflater inflater = mode.getMenuInflater();
      inflater.inflate(R.menu.todo_context_menu, menu);
      return true;
    }

    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
      return true;
    }

    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
      SparseBooleanArray selectedItems = getListView().getCheckedItemPositions();
      switch (item.getItemId()) {
        case R.id.item_delete:
          m_list.deleteItems(selectedItems);
          TodoContainer.getInstance().saveLists(getActivity());
          mode.finish();
          break;
        case R.id.item_email:
          TodoList list = m_list.getSubList(selectedItems);
          TodoEmailer e = new TodoEmailer(getActivity(), list);
          e.send();
          mode.finish();
          break;
        case R.id.item_archive:
          TodoList targetList = TodoContainer.getInstance().getList(getActivity(), m_archiveListName);
          m_list.moveItems(selectedItems, targetList);
          TodoContainer.getInstance().saveLists(getActivity());
          mode.finish();
          break;
        default:
          return false;
      }
      return true;
    }

    @Override
    public void onDestroyActionMode(ActionMode mode) {
      mActionMode = null;
    }

    @Override
    public void onItemCheckedStateChanged(ActionMode mode, int position,
        long id, boolean checked) {
    }
    
  }
}

Java Source Code List

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