with multitasking
Google has announced that it is introducing a developer feature that allows users to open and view multiple apps on their Android phone, with not just one app running and the rest being paused.

This function is called ‘ multi-resume ‘ and ensures that if there are multiple windows of different apps open, all these apps also remain active and can be used. Previously it was possible in Android to have multiple windows in a split screen for example, but there was always an app that was not active.

The new Android 9 Pie feature is designed for developers so that they can add certain metadata in the app manifest so that those apps will no longer be paused if the user wants to use multiple apps simultaneously when multitasking. In principle, an update will also be required in order to use multi-resume on a phone with Android 9.0. This will probably be supported by default in the next Android version.