Android 17 Introduces 'Handoff' for Seamless Cross-Device Continuity
Android 17 is set to introduce a groundbreaking cross-device continuity feature named 'Handoff'. Google describes Handoff as a dual-purpose innovation: operating as a user-facing background feature and a robust API for developers.
Handoff enables users to initiate an app activity on one Android device and seamlessly transfer it to another Android device.
Google plans to leverage the launcher and taskbar interfaces to prominently display available activities from nearby devices. When transferred, Handoff is engineered to launch the corresponding native Android app on the receiving device, directly deep-linking to the designated activity.
App-to-Web Fallback and Developer Scope
In a significant addition, Android 17 will also include an "app-to-web Handoff" option, providing a crucial fallback mechanism. For developers, the implementation of Handoff support is granular, applied on a per-activity basis.
Developer Implementation
To activate Handoff for a specific activity, developers are required to invoke the setHandoffEnabled() method. During the handoff process, passing additional data may be essential to ensure the recreated activity on the receiving device can accurately restore its previous state.
Developers must also implement the onHandoffActivityRequested() callback. This callback is responsible for returning a HandoffActivityData object, which provides detailed instructions on how Handoff should manage and recreate the activity.
Enhanced Experience for Large Screens and Practical Applications
The integrated taskbar feature, crucial for Handoff's visibility, is specifically designed for foldables, tablets, and other large-screen Android devices. This new continuity feature promises to facilitate practical scenarios, such as beginning an email composition on a smartphone and effortlessly completing it on a laptop or tablet.