Hello, everyone, im interested in creating extentions, but i dont know any programming languages, can i get some help on basics? or even to create my very first basic extention...
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http://ai2.appinventor.mit.edu/reference/other/extensions.html
https://developer.android.com/guide
Search the community for information about IDE's and extension builders (e.g. RUSH)
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Java is used to make extensions, you may start learning its basics 
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As @Kumaraswamy said basic of Java would be essential as java is having large contribution in App Inventor's base code
Basic elements of Java are
- Variable and data type
- Conditional and looping statement
- What is array and string
- Classes, objects and inheritance
- File handling
A very important stuff in every programming language is Variable.
Thanks,
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Java is way to go, u can always see youtube, docs and references to boost up your knowledge and basics
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