I have to create an app that requires that by pressing a button, turn off the tablet.
How can I do?
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How to do with app inventor 2?
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as already said, use the activity starter
and several examples here https://puravidaapps.com/ snippets.php#2activity
now it's your turn
A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook http://www.appinventor.org/b ook2 ... 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 http://www.appinventor.or g/content/CourseInABox/Intro and the aia files for the projects in the book are here: http://www.appinventor.org/bo okFiles
How to do a lot of basic things with App Inventor are described here: http://www.appinventor.org/co ntent/howDoYou/eventHandling .
Also do the tutorials http://appinventor.mit.edu/ explore/ai2/tutorials.html to learn the basics of App Inventor, then try something and follow the
Top 5 Tips: How to learn App Inventor
You will not find a tutorial, which does exactly what you are looking for. But doing the tutorials (not only reading a little bit) help you to understand, how things are working. This is important and this is the first step to do.
Taifun
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