content: /*
   * Copyright (C) 2012 The Android Open Source Project
   *
   * 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.cjj.volley.toolbox;
  
  import android.content.Context;
  import android.content.pm.PackageInfo;
  import android.content.pm.PackageManager.NameNotFoundException;
  import android.net.http.AndroidHttpClient;
  import android.os.Build;
  
  import com.cjj.volley.Network;
  import com.cjj.volley.RequestQueue;
  
  import java.io.File;
  
  public class Volley {
  
      /** Default on-disk cache directory. */
      private static final String DEFAULT_CACHE_DIR = "volley";
  
      /**
       * Creates a default instance of the worker pool and calls {@link RequestQueue#start()} on it.
       *
       * @param context A {@link Context} to use for creating the cache dir.
       * @param stack An {@link HttpStack} to use for the network, or null for default.
       * @return A started {@link RequestQueue} instance.
       */
      public static RequestQueue newRequestQueue(Context context, HttpStack stack) {
          File cacheDir = new File(context.getCacheDir(), DEFAULT_CACHE_DIR);
  
          String userAgent = "volley/0";
          try {
              String packageName = context.getPackageName();
              PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0);
              userAgent = packageName + "/" + info.versionCode;
          } catch (NameNotFoundException e) {
          }
  
          if (stack == null) {
              if (Build.VERSION.SDK_INT >= 9) {
                  stack = new HurlStack();
              } else {
                  // Prior to Gingerbread, HttpUrlConnection was unreliable.
                  // See: http://android-developers.blogspot.com/2011/09/androids-http-clients.html
                  stack = new HttpClientStack(AndroidHttpClient.newInstance(userAgent));
              }
          }
  
          Network network = new BasicNetwork(stack);
  
          RequestQueue queue = new RequestQueue(new DiskBasedCache(cacheDir), network);
          queue.start();
  
          return queue;
      }
  
      /**
       * Creates a default instance of the worker pool and calls {@link RequestQueue#start()} on it.
       *
       * @param context A {@link Context} to use for creating the cache dir.
       * @return A started {@link RequestQueue} instance.
       */
      public static RequestQueue newRequestQueue(Context context) {
          return newRequestQueue(context, null);
      }
  }
  