Show all videos of this series.The training site for Android is full of great resources. If you have an interest in Android development, I would recommend to go through all of the sections, but if your time is limited and you can only go through a bunch of them, you should not skip Managing the Activity Lifecycle.
Always keep the following figure in mind when developing and app, and App Inventor provides hooks to the Activity Lifecycle through the Form class:
|Activity Lifecycle, from Android training site.|
The following video shows those hooks, and the main interfaces used to that effect:
In the next video we will be showing how to package the Companion app from sources, and explaining why you would want to do that in first place.