- get your location to display using the LocationSensor and the Map components
what you need to do is use one of several methods to create a ringed fence
Location (within a radius of 10 meters from the specified location) on Mitt App - #3 by SteveJG
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use the ringed fence method of your choice (there are several ways to construct one as shown in the provided links). When within 30 km, use the Notifier component to post your message to the user of your app.
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experiment and code each part, one at at time and get the parts of the app to work.
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if you have specific questions, post the code you used and someone will provide advice.
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good luck. You can do this.
Here are some resources to help you learn to use the AI2 tools. A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook App Inventor 2 Book: Create Your Own Android Apps ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here Course In A Box and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .
Also look here App inventor español. Offline. Tutorial. Ejemplos. Instalación. Códigos. Juegos. Curso gratis de App inventor. and here Tutorial Index | imagnity for more tutorials including Imagnity.com List Tutorial, Mirrored - @Saj
Learn about components Component Reference
and visit the Library The MIT App Inventor Library: Documentation & Support Help>Library on the MENU