You learn more about communicating between an Activity and a Fragment later in this chapter. Because data in a Fragment is usually relevant to the Activity that hosts it, your Activity code can use a callback to retrieve data from the Fragment, and then restore that data when recreating the Fragment. OnAttach(), onCreate(), onCreateView(), onActivit圜reated()įragment is added and its layout is inflated.įragment is active and ready for user interaction.įragment is paused because the Activity is paused.įragment is stopped and no longer visible.Īs with an Activity, you can save the variable assignments in a Fragment. For example, when the Activity receives onPause(), it triggers a Fragment onPause() for each Fragment in the Activity. For example, when the Activity is paused, so are all Fragments in it, and when the Activity is destroyed, so are all Fragments.Įach lifecycle callback for the Activity results in a similar callback for each Fragment, as shown in the following table. How the Activity state affects the Fragmentīecause a Fragment is always hosted by an Activity, the Fragment lifecycle is directly affected by the host Activity lifecycle. Once added, the Fragment goes through three states, as shown in the figure below: The Fragment is added by an Activity (which acts as the host of the Fragment). Within the Fragment lifecycle callback methods, you can declare how your Fragment behaves when it is in a certain state, such as active, paused, or stopped. Using a Fragment lifecycle is a lot like using an Activity lifecycle (see The Activity Lifecycle for details). This chapter describes the mechanisms for passing data and how to manage the Fragment lifecycle within an Activity. Understanding the relationship between Activity and Fragment lifecycles helps you design fragments that can save and restore variables and communicate with activities.Īn Activity that hosts a Fragment can send information to that Fragment, and receive information from that Fragment. Like an Activity, a Fragment has its own lifecycle. Communicating between a Fragment and an Activity.Using Fragment methods and the Activity context.Unit 6: Working with Architecture Components 1.2: Fragment lifecycle and communicationsĤ.3: Best practices: network, battery, compression
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