Android Open Source - opentraining Workout List Fragment

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * /*  ww  w.j  ava 2  s .c  o m*/
 * This is OpenTraining, an Android application for planning your your fitness training.
 * Copyright (C) 2012 Christian Skubich
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

package de.skubware.opentraining.activity.manage_workouts;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import de.skubware.opentraining.R;
import de.skubware.opentraining.basic.Workout;
import de.skubware.opentraining.db.DataProvider;
import de.skubware.opentraining.db.IDataProvider;

/**
 * A list fragment representing a list of Workouts. 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 WorkoutDetailFragment}.
 * <p>
 * Activities containing this fragment MUST implement the {@link Callbacks}
 * interface.
 */
public class WorkoutListFragment extends ListFragment {

  /** Tag for logging */
  public static final String TAG = "WorkoutListFragment";

  /**
   * 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;

  /** Currently displayed {@link Workout}s */
  private List<Workout> mWorkoutList;

  /**
   * 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 a {@link Workout} has been selected.
     */
    public void onItemSelected(Workout workout);
  }

  /**
   * 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(Workout id) {
    }
  };

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

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

    
    IDataProvider dataProvider = new DataProvider(getActivity());
    mWorkoutList = new ArrayList<Workout>(dataProvider.getWorkouts());

    setListAdapter(new ArrayAdapter<Workout>(getActivity(), android.R.layout.simple_list_item_single_choice, android.R.id.text1,
        mWorkoutList));

    // notify user if there are no workouts
    if (mWorkoutList.isEmpty()) {
      AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
      builder.setMessage(getString(R.string.no_workout));
      builder.setPositiveButton(getString(android.R.string.ok), new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          dialog.dismiss();
          getActivity().finish();
        }
      });
      builder.create().show();
    }
  }
  
  @Override
  public void onResume(){
    super.onResume();
    
    IDataProvider dataProvider = new DataProvider(getActivity());
    mWorkoutList = new ArrayList<Workout>(dataProvider.getWorkouts());

    setListAdapter(new ArrayAdapter<Workout>(getActivity(), android.R.layout.simple_list_item_single_choice, android.R.id.text1,
        mWorkoutList));
  }
  
  /** @see WorkoutListActivity#onWorkoutChanged(Workout) */
  @SuppressWarnings("unchecked")
  public void onWorkoutChanged(Workout changedWorkout) {
    Workout oldWorkout = null;

    // try to find an old Workout with the same name(will fail, if the name
    // was changed)
    for (Workout w : mWorkoutList) {
      if (w.getName().equals(changedWorkout.getName())) {
        oldWorkout = w;
        break;
      }
    }

    if (oldWorkout == null) {
      // if only the name was changed, the exercises still have to be the
      // same
      for (Workout w : mWorkoutList) {
        if (w.getFitnessExercises().equals(changedWorkout.getFitnessExercises())) {
          oldWorkout = w;
          break;
        }
      }

    }

    if (oldWorkout == null) {
      // no changed workout, but new one
      mWorkoutList.add(changedWorkout);
      return;
    }

    Log.d(TAG, "Workout has changed. Old Workout: " + oldWorkout.toDebugString() + "\n New Workout: " + changedWorkout.toDebugString());

    // replace Workout with changed one
    int oldIdx = mWorkoutList.indexOf(oldWorkout);
    mWorkoutList.remove(oldWorkout);
    mWorkoutList.add(oldIdx, changedWorkout);

    // finally update GUI
    ((ArrayAdapter<Workout>) this.getListAdapter()).notifyDataSetChanged();

  }

  @Override
  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)) {
      setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
    }
  }

  @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;
  }

  @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(((Workout) listView.getAdapter().getItem(position)));
  }

  @Override
  public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(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.
    getListView().setChoiceMode(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;
  }
  
  
}

Java Source Code List

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