MyVolley.java

/**
 * Copyright 2013 Ognyan Bankov 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 com.android.volley.examples.toolbox;

import android.app.ActivityManager;
import android.content.Context;

import com.android.volley.RequestQueue;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.Volley;

/**
 * Helper class that is used to provide references to initialized
 * RequestQueue(s) and ImageLoader(s)
 * 
 * @author Ognyan Bankov
 */
public class MyVolley {
	private static RequestQueue mRequestQueue;
	private static ImageLoader mImageLoader;

	private MyVolley() {
		// no instances
	}

	public static void init(Context context) {
		mRequestQueue = Volley.newRequestQueue(context);

		int memClass = ((ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE))
				.getMemoryClass();
		// Use 1/8th of the available memory for this memory cache.
		int cacheSize = 1024 * 1024 * memClass / 4;// 8;
		mImageLoader = new ImageLoader(mRequestQueue, new BitmapLruCache(cacheSize));

	}

	public static RequestQueue getRequestQueue() {
		if (mRequestQueue != null) {
			return mRequestQueue;
		} else {
			throw new IllegalStateException("RequestQueue not initialized");
		}
	}

	/**
	 * Returns instance of ImageLoader initialized with {@see FakeImageCache}
	 * which effectively means that no memory caching is used. This is useful
	 * for images that you know that will be show only once.
	 * 
	 * @return
	 */
	public static ImageLoader getImageLoader() {
		if (mImageLoader != null) {
			return mImageLoader;
		} else {
			throw new IllegalStateException("ImageLoader not initialized");
		}
	}
}