To enable it, you only need to opt into enableOnBackInvokedCallback, as explained in Enable predictive back gesture. The predictive back gesture is supported automatically for apps that use the default back navigation. An Android device enabled with Gesture navigationĢ.The new user experience coming in Android 13+ providing a more predictive back gesture navigation.Other options for handling Back gestures.How to return the Back event to the system.How to intercept the on-back invocation for AndroidX.In this codelab, you'll use AndroidX API libraries to handle Back gestures in the Sunflower app. In other words, for the new animations to work, the system needs to know ahead of time if the app is intercepting the back navigation gesture. This codelab shows you how to prepare an AndroidX app that intercepts system Back by migrating it to support predictive back gesture with a WebView, by using the APIs that implement the ahead-of-time back navigation model. In the case of this codelab, we're going to fix a survey fragment that implements a WebView. This API replaces the KeyEvent.KEYCODE_BACK API and all platform classes that use OnBackPressed, which are planned for deprecation and which will require migration in the next major Android release following 13. To support the predictive back gesture, Android 13 adds the new window-level OnBackInvokedCallback platform API. Here's an example of what that's going to look like: This feature will let a user preview the result of a Back gesture before they fully complete it – basically allowing them to decide whether to stay in the current view or complete the action and return to the Home screen, a previous activity, or a previously visited page in a WebView. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.In Android 13, we've added APIs that serve as the foundation of upcoming support for a predictive back gesture. Fragments: Past, present, and future (Android Dev Summit '19)Ĭontent and code samples on this page are subject to the licenses described in the Content License.Single Activity: Why, when, and how (Android Dev Summit '18).Navigate between fragments using animations.Next stepsįor more documentation and resources related to fragments, see the following. The logic necessary to manage its own UI. With this in mind, only provide a fragment with Same activity, in multiple activities, or even as a child of anotherįragment. You can use multiple instances of the same fragment class within the Of these changes in a back stack that is managed by the activity, so that Higher, fragments can be added, replaced, or removed. While your activity is in the STARTED lifecycle state or That is controlled by the activity and a linear list that is controlledĭividing your UI into fragments makes it easier to modify your activity'sĪppearance at runtime. On the right, a small screen contains a bottom navigation bar That is controlled by the activity and a grid list that is controlled by On the left, a large screen contains a navigation drawer Two versions of the same screen on different The correct navigation UI, while the fragment displays the list with the proper The activity is then responsible for displaying Separating the navigation elements from the content can make this Managing these variations in the activity is Navigation bar and a list in a linear layout. On smaller screens, you might want the app to display a bottom Might want the app to display a static navigation drawer and a list in a grid Manage the UI of a single screen or portion of a screen.Ĭonsider an app that responds to various screen sizes. Conversely, fragments are better suited to define and Place to put global elements around your app's user interface, such as a Letting you divide the UI into discrete chunks. Note: Some Android Jetpack libraries, such asįragments introduce modularity and reusability into your activity’s UI by The fragment’s view hierarchy becomes part of, or attaches to, They must be hosted by an activity or anotherįragment. Layout, has its own lifecycle, and can handle its own input events.
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