How do I create an extension?

I have knowledge in the Python language, and I have some knowledge in Java and I can deal with it. How do I create an extension for my application? Is there an article explaining this or a YouTube video?

Hello @santos! Exel Here, and yes, there are MANY videos on coding MIT App Inventor Extensions! I don't code myself, but I looked it up, so here is a video I found:

Thank you, brother
But can this be done from the phone?

Uhh, no. I only code on a Chromebook. And make apps.

Well, thank you + The video explains a site that has been closed since March, according to my information

This app allows you to create extensions on your phone.

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Whoops, my appologies.

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Here is one way

Here are other ways to build extensions ( previously post by Gordon)

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Thank you, brother

Thank you, brother.

You could use the FAST-CLI to build extensions using Android phone.

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