NotificationCenter.java

package com.itap.voiceemoticon.activity;

import java.lang.ref.WeakReference;
import java.util.ArrayList;

import android.os.Handler;
import android.os.Looper;

/**
 * 
 * 
 * 
 * @author 
 *
 */
public class NotificationCenter {

    private static final Handler sHandler = new Handler(Looper.getMainLooper());
    
    public static final int MAX_COUNT = 100;
    
	private static ArrayList<WeakReference<INotify>>[] mArray;
	
	static {
		mArray = new ArrayList[MAX_COUNT];
		for (int i = 0; i < MAX_COUNT - 1; i++) {
			mArray[i] = new ArrayList<WeakReference<INotify>>();
		}
	}
	
	private static NotificationCenter mInstance = null;
	
	private NotificationCenter() {
	}
	
	public static NotificationCenter getInstance() {
		if (mInstance == null) {
			mInstance =  new NotificationCenter();
		}
		return mInstance;
	}
	
	public void register(INotify notify, int notificationID) {
		mArray[notificationID].add(new WeakReference<INotify>(notify));
	}
	
	public void unregister(INotify notify, int notificationID) {
		final int size = mArray[notificationID].size();
		INotify arrayMember;
		for (int i = 0; i < size; i++) {
			WeakReference<INotify> weakObject = mArray[notificationID].get(i);
			arrayMember = weakObject.get();
			if (arrayMember != null && arrayMember == notify) {
				mArray[notificationID].remove(weakObject);
				return;
			}
		}
	}
	
	private ArrayList<WeakReference<INotify>> mTempUseArray = new ArrayList<WeakReference<INotify>>();
	
	public void notify(Notification notification) {
	    notifyInUIThread(notification);
	}
	
	private void notifyInUIThread(final Notification notification) {
	    sHandler.post(new Runnable() {
            @Override
            public void run() {
                INotify notify;
                for (int i=0; i<mArray[notification.id].size(); ++i) {
                    WeakReference<INotify> weakObject = mArray[notification.id].get(i);
                    notify = weakObject.get();
                    if (notify != null) {
                        notify.notify(notification);
                    } else {
                        mTempUseArray.add(weakObject);
                    }
                }
                
                for (int i=0; i<mTempUseArray.size(); ++i) {
                    mArray[notification.id].remove(mTempUseArray.get(i));
                }
                mTempUseArray.clear();
            }
        });
	}
	
	public static Notification obtain(int id, Object extObj) {
		return new Notification(id, extObj);
	}
	
	public static Notification obtain(int id) {
		return new Notification(id);
	}
}