Android Open Source - android-flash-cards Main Application

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2012 Thomas Amsler/* w  w  w .j av  a  2  s . c om*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */

package org.thomasamsler.android.flashcards;

import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import android.app.Application;

public class MainApplication extends Application {

  private Map<Integer, List<WeakReference<ActionBusListener>>> actionBusListeners;
  
  public void registerAction(ActionBusListener actionBusListener, Integer... actions) {
    
    if(null == actionBusListener || null == actions) {
      
      return;
    }
    
    for(Integer action: actions) {
      
      List<WeakReference<ActionBusListener>> listeners = actionBusListeners.get(action);
      
      if(null == listeners) {
        
        listeners = new ArrayList<WeakReference<ActionBusListener>>();
      }

      /*
       * Before we add the new listener, we remove all previous listeners of that object type 
       */
      removeReference(listeners, actionBusListener);
      
      listeners.add(new WeakReference<ActionBusListener>(actionBusListener));
      actionBusListeners.put(action, listeners);
    }
  }
  
  public void doAction(Integer action) {
    
    doAction(action, null);
  }
  
  public void doAction(Integer action, Object data) {
    
    if(null == action) {
      
      return;
    }
    
    List<WeakReference<ActionBusListener>> listeners = actionBusListeners.get(action);
    
    if(null == listeners) {
      
      return;
    }
    
    for(WeakReference<ActionBusListener> weakReference : listeners) {
      
      ActionBusListener listener = weakReference.get();
      
      if(null != listener) {
        
        listener.doAction(action, data);
      }
    }
  }
  
  /*
   * This will be called from the main activity in its onCreate() method
   */
  public void initActionBusListener() {
    
    actionBusListeners = new HashMap<Integer, List<WeakReference<ActionBusListener>>>();
  }
  
  /*
   * Helper method that removes items from a list that match the reference object's class type
   */
  private static <T> void removeReference(List<WeakReference<T>> list, T reference) {
    
    for (Iterator<WeakReference<T>> iterator = list.iterator(); iterator.hasNext();) {
      
      WeakReference<T> weakReference = iterator.next();
      
      if (weakReference.get().getClass().equals(reference.getClass())) {

        iterator.remove();
      }
    }
  }
}

Java Source Code List

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