/*
* Copyright (C) 2010 Cyril Mottier (http://www.cyrilmottier.com)
*
* 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 greendroid.app;
import greendroid.image.ImageCache;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import android.app.Activity;
import android.app.Application;
import android.content.Intent;
/**
* Defines various methods that should be overridden in order to style your
* application.
*
* @author Cyril Mottier
*/
public class GDApplication extends Application {
/**
* Used for receiving low memory system notification. You should definitely
* use it in order to clear caches and not important data everytime the
* system need memory.
*
* @author Cyril Mottier
* @see GDApplication#registerOnLowMemoryListener(OnLowMemoryListener)
* @see GDApplication#unregisterOnLowMemoryListener(OnLowMemoryListener)
*/
public static interface OnLowMemoryListener {
public void onLowMemoryReceived();
}
private static final int CORE_POOL_SIZE = 5;
private static final ThreadFactory sThreadFactory = new ThreadFactory() {
private final AtomicInteger mCount = new AtomicInteger(1);
public Thread newThread(Runnable r) {
return new Thread(r, "GreenDroid thread #" + mCount.getAndIncrement());
}
};
private ExecutorService mExecutorService;
private ImageCache mImageCache;
private ArrayList<WeakReference<OnLowMemoryListener>> mLowMemoryListeners;
public GDApplication() {
mLowMemoryListeners = new ArrayList<WeakReference<OnLowMemoryListener>>();
}
public ExecutorService getExecutor() {
if (mExecutorService == null) {
mExecutorService = Executors.newFixedThreadPool(CORE_POOL_SIZE, sThreadFactory);
}
return mExecutorService;
}
public ImageCache getImageCache() {
if (mImageCache == null) {
mImageCache = new ImageCache(this);
}
return mImageCache;
}
/**
* Returns the class of the home {@link Activity}. The home {@link Activity}
* is the main entrance point of your application. This is usually where the
* dashboard/general menu is displayed.
*
* @return The Class of the home {@link Activity}
*/
public Class<?> getHomeActivityClass() {
return null;
}
/**
* Each application may have an "application intent" which will be used when
* the user clicked on the application button.
*
* @return The main application {@link Intent} (may be null if you don't
* want to use the main application {@link Intent} feature)
*/
public Intent getMainApplicationIntent() {
return null;
}
/**
* Adds a new listener to the list
*
* @param listener The listener to unregister
* @see {@link OnLowMemoryListener}
*/
public void registerOnLowMemoryListener(OnLowMemoryListener listener) {
if (listener != null) {
mLowMemoryListeners.add(new WeakReference<OnLowMemoryListener>(listener));
}
}
/**
* Removes a previously registered listener
*
* @param listener The listener to unregister
* @see {@link OnLowMemoryListener}
*/
public void unregisterOnLowMemoryListener(OnLowMemoryListener listener) {
if (listener != null) {
int i = 0;
while (i < mLowMemoryListeners.size()) {
final OnLowMemoryListener l = mLowMemoryListeners.get(i).get();
if (l == null || l == listener) {
mLowMemoryListeners.remove(i);
} else {
i++;
}
}
}
}
@Override
public void onLowMemory() {
super.onLowMemory();
int i = 0;
while (i < mLowMemoryListeners.size()) {
final OnLowMemoryListener listener = mLowMemoryListeners.get(i).get();
if (listener == null) {
mLowMemoryListeners.remove(i);
} else {
listener.onLowMemoryReceived();
i++;
}
}
}
}