A Developer’s Roadmap to Predictive Again (Views)

Again-to-home animation milestone

The back-to-home animation is the keystone predictive again animation.

To get this animation, add android:enableOnBackInvokedCallback=true in your AndroidManifest.xml in your root exercise in case you are a multi-activity app (see per-activity opt-in) or on the software stage in case you are a single-activity app. After this, you’ll see each the back-to-home animation and a cross-task animation the place relevant, that are seen to customers in Android 15+ and behind a developer choice in Android 13 and 14.

If you’re intercepting again occasions in your root exercise (e.g. MainActivity), you possibly can proceed to take action however you’ll want to make use of supported APIs and also you gained’t get the back-to-home animation. Because of this, we typically advocate you solely intercept again occasions for UI logic; for instance, to indicate a dialog asking the consumer to avoid wasting earlier than they give up.

See the Add assist for the predictive again gesture information for extra particulars.

Migrate all actions milestone

If you’re a multi-activity app, you’ll must opt-in and deal with again occasions inside these actions too to get a system managed cross-activity animation. Study extra about per-activity opt-in, accessible for units working Android 14+. The cross-activity animation is seen to customers in Android 15+ and behind a developer choice in Android 13 and 14.

Customized cross exercise animations are additionally accessible with overrideActivityTransition.

Fragment milestone

Subsequent, you’ll need to focus in your fragment animations and transitions. This requires updating to AndroidX fragment 1.7.0 and transition 1.5.0 or later and utilizing Animator or AndroidX Transitions. Assuming these necessities are met, your present fragment animations and transitions will animate in keeping with the again gesture. You may as well use materials movement with fragments. Most materials motions assist predictive again as of 1.12.02-alpha02 or increased, together with MaterialFadeThrough, MaterialSharedAxis and MaterialFade.

Don’t attempt to make your fragment transitions seem like the system’s cross-activity transition. We advocate this full display floor transition as an alternative.

Study extra about Fragments and Predictive Again.

Materials Parts milestone

Lastly, you’ll need to benefit from the Materials Element View animations accessible for Predictive Again. Study extra about accessible parts.

After this, you’ve accomplished your quest to assist Predictive Again animations in your view primarily based app.

[Optional] AndroidX Transitions milestone

For those who’re up for extra, you may additionally guarantee your AndroidX transitions are supported with Predictive Again. Learn extra about AndroidX Transitions and the Predictive Again Progress APIs.

Different Assets