Android Studio Coordinatorlayout & Recyclerview Blank?

Runing my app i get a blank activity, for the time being i only have a list which should be projecting images, by reading these images addresses from JSON, and from the logcat i co

Solution 1:

In ImagesAddresses(); you are using Firebase to retrieve the data from your webservice, and you get the results through the delegate method onDataChange. Since the execution of this method is asynchronous, what happens is that initViews(); and, therefore prepareData(), are called before onDataChange is called. As you can image android_image_urls is still empty. What you have to do to fix is to call initViews(); from onDataChange, making sure that it, initViews();, runs on the UI Thread.