title: Cannot create AdRequest instance by pyjnius
body: <p>I'm trying to install AdMob on Kivy. I import AdRequest successfully but cannot create its instance.</p>
  
  <pre><code>AdRequest = autoclass("com.google.android.gms.ads.AdRequest")
  print "AdRequest: ", AdRequest
  print dir(AdRequest)
  </code></pre>
  
  <p>In the logcat, I can see the properties and methods of AdRequest by dir() :</p>
  
  <pre><code>AdRequest &lt;class 'jnius.reflect.com.google.android.gms.ads.AdRequest'&gt;
  ['DEVICE_ID_EMULATOR', 'ERROR_CODE_INTERNAL_ERROR', 'ERROR_CODE_INVALID_REQUEST',        
  'ERROR_CODE_NETWORK_ERROR', 'ERROR_CODE_NO_FILL', 'GENDER_FEMALE', 'GENDER_MALE',   
  'GENDER_UNKNOWN', 'MAX_CONTENT_URL_LENGTH', '__class__', '__cls_storage', 
  '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', 
  '__init__', '__javaclass__', '__javaconstructor__', '__module__', '__new__',   
  '__pyx_vtable__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', 
  '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'equals', 'getBirthday', 
  'getClass', 'getContentUrl', 'getCustomEventExtrasBundle', 'getGender', 'getKeywords', 
  'getLocation', 'getNetworkExtras', 'getNetworkExtrasBundle', 'hashCode', 
  'isTestDevice', 'notify', 'notifyAll', 'toString', 'wait']
  
  AttributeError: type object 'com.google.android.gms.ads.AdRequest' has no attribute    
  'Builder'
  Python for android ended.
  </code></pre>
  
  <p>I cannot find the Builder method
  <a href="https://developer.android.com/reference/com/google/android/gms/ads/AdRequest.html" rel="nofollow">https://developer.android.com/reference/com/google/android/gms/ads/AdRequest.html</a>
  It's a class method to build AdRequest</p>