Resolution of the screen in App Inventor

[Anke]

Support different pixel densities  |  Android Developers

DesignBytes: Density-independent Pixels

AppyBuilder TIPS: Responsive App Design (Best Practices, Concepts)

What can cause the application to close on start?

https://developer.android.com/guide/topics/resources/more-resources.html#Dimension Images should have the resolution / dimension that is actually required in the app.