In practice, Fragments should depend on views and respond to events that happen within views. Fragments use views to implement UI, but you can have Fragments that don’t use views, and that’s perfectly ok. The smaller and smarter we write Fragments, the less they are impacted by their surroundings. In fact, they are the same as Activities in terms of abstraction. The Fragment Tag hasn’t helped, either.Īdam argues that we can overcome most of these challenges if we think about Fragments in a couple of different ways:įirst, Fragments, like all the other android components, are simply composable entry points into an application.

Not to mention if you were to run into problems within a transaction, Android will throw the dreaded IllegalStateException which can be really challenging to debug.Ĭustom View or Fragment? - Confusion as to whether to use a Fragment or a custom view. Complex Lifecycle - The activity lifecycle is complex, and when you throw Fragments into the mix the result can be daunting.įragment Manager Transactions - Asynchronous, which can lead to unexpected behaviors (also buggy).In this talk, Adam discussed some of the common problems developers have with Fragments: On top of that, Google didn’t provide much guidance as to their usage, which was sort of intended.Īt Google I/O 2016, Adam Powell of the Android Framework Team gave a presentation on how to efficiently use fragments. Their addition to the framework, however, wasn’t exactly welcomed with a ticker tape parade.įor both beginners and advanced developers, Fragments have always seemed a bit confusing. Thus, the Android team added Fragments, or composable Activities, in an attempt to break up these giant, monolithic Activities.

In 2011, however, tablets started entering the market and developers needed a way of reusing code to support larger screen sizes without having to duplicate business logic (a prime example of this are master/detail flows). Before Android 3.0, Activities were essentially God objects that oversaw large chunks of what happened in our applications.

Android studio fragment oncreateview