If your students are already familiar with Scratch, they are now ready to move to AppInventor.
Using AI Companion is the best way to test apps in real time on any Android device. Here is a short video that explains how to download and use AI Companion.
It is very easy to use AppInventor for group projects and partner programming. Here is how students can export/import their code.
Here is a video that explains how to install an app created in AppInventor to any Android device. This is NOT the same as using AI Companion to test the app in real time! Here we actually download the app permanently on the Android device.
For more details about AppInventor check out this presentation.