How do I start other app programs?

[hphsh]

For example, how to create an app form, place a button, and click the button to launch other app programs?

[uskiara]

See the Activity Starter FAQ (thanks to @ABG)

FAQ Section: Activity Starter

MIT Activity Starter Guide How to request and receive a return value from the Activity Starter - @Juan_Antonio Activity Starter Catalog Sample App AndExplorer File Picker example How to download and install another app using the Activity Starter - Taifun How to find the Activity for an app - Pavitra How to set up Activity Starter using Logcat How to update/run/delete another app using the activity starter - Taifun, Horst Schulze How to view a pdf document Instagram starter - Shahrooz M…

You'll find there everything you need.
Best wishes.

[Taifun]

@hphsh

click the button to launch other app

The package manager extension might be interesting for you

App Inventor Extensions: Package Manager | Pura Vida Apps

Taifun