VolleyController.java

package com.dpt.TNetwork.net;

import android.content.Context;
import android.text.TextUtils;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.Volley;

/**
 * Created by dupengtao on 2014/6/14.
 */
public class VolleyController {

    private static final String TAG=VolleyController.class.getSimpleName();
    private static VolleyController controller;
    private final Context mContext;
    private ImageLoader mImageLoader;
    private RequestQueue mRequestQueue;
    private LruBitmapCache mLruBitmapCache;

    private VolleyController(Context context) {
        mContext=context;
    }

    public static synchronized VolleyController getInstance(Context context){
        if (controller==null){
            controller= new VolleyController(context);
        }
        return controller;
    }

    /**
     * @return The Volley Request queue, the queue will be created if it is null
     */
    public RequestQueue getRequestQueue() {
        // lazy initialize the request queue, the queue instance will be
        // created when it is accessed for the first time
        if (mRequestQueue == null) {
            mRequestQueue = Volley.newRequestQueue(mContext);
        }

        return mRequestQueue;
    }

    /**
     * Adds the specified request to the global queue, if tag is specified
     * then it is used else Default TAG is used.
     *
     * @param req
     * @param tag
     */
    public <T> void addToRequestQueue(Request<T> req, String tag) {
        // set the default tag if tag is empty
        req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);

        VolleyLog.d("Adding request to queue: %s", req.getUrl());

        getRequestQueue().add(req);
    }

    /**
     * Adds the specified request to the global queue using the Default TAG.
     *
     * @param req
     */
    public <T> void addToRequestQueue(Request<T> req) {
        // set the default tag if tag is empty
        req.setTag(TAG);

        getRequestQueue().add(req);
    }

    /**
     * Cancels all pending requests by the specified TAG, it is important
     * to specify a TAG so that the pending/ongoing requests can be cancelled.
     *
     * @param tag
     */
    public void cancelPendingRequests(Object tag) {
        if (mRequestQueue != null) {
            mRequestQueue.cancelAll(tag);
        }
    }

    public ImageLoader getImageLoader() {
        getRequestQueue();
        if (mImageLoader == null) {
            mLruBitmapCache = new LruBitmapCache();
            mImageLoader = new ImageLoader(this.mRequestQueue,mLruBitmapCache);
        }
        return this.mImageLoader;
    }

    public LruBitmapCache getLruBitmapCache() {
        return mLruBitmapCache;
    }
}