VolleyHelper.java

package com.github.volley.example.toolbox;

import android.content.Context;

import com.android.volley.RequestQueue;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.Volley;
import com.github.volley.example.toolbox.BitmapLruCache;

/**
 * Helper class that is used to provide references to initialized RequestQueue(s) and ImageLoader(s)
 */
public class VolleyHelper {
    private static final int MAX_IMAGE_CACHE_ENTIRES  = 100;
    private static RequestQueue mRequestQueue;
    private static ImageLoader mImageLoader;

    private VolleyHelper() {
    }

    static void init(Context context) {
        mRequestQueue = Volley.newRequestQueue(context);
        mImageLoader = new ImageLoader(mRequestQueue, new BitmapLruCache(MAX_IMAGE_CACHE_ENTIRES));
    }

    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.
     */
    public static ImageLoader getImageLoader() {
        if (mImageLoader != null) {
            return mImageLoader;
        } else {
            throw new IllegalStateException("ImageLoader not initialized");
        }
    }
}