App Inventor and 
Java
How to toggle GPS from within App Inventor calling a Java appAs you know, to toggle GPS from within App Inventor directly is not possible, you only can
open the settings window for the user
to enable/disable it. And this also is generally not possible with the Android SDK, why see also
here:
"You can't for security/privacy reasons, you have to forward to location preferences screen and let the user enable/disable it."
However for Android 2.x devices, the GPS can be toggled by exploiting a bug in the power manager widget!
I now prepared a small Java app
Toggle GPS you can call with
the Activity Starter from App Inventor to toggle GPS. I tested successfully with a HTC Desire running Android 2.2 and
a HTC Desire S running Android 2.3.5. It did not work (as expected) on Samsung Galaxy Tab running Android 3.2.
Thank you 
Toggle GPS doesn't need any permissions.
You also can call Toggle GPS directly
(without App Inventor) and it will enable/disable the GPS. As already mentioned this will work on Android 2.x devices only.
App Inventor,
Developing and maintaining snippets, tutorials and extensions for App Inventor takes a lot of time.
I hope it saved some of your time. If yes, then you might consider to donate a small amount!
or donate some mBTC to 
Address:
1Jd8kXLHu2Vkuhi15TWHiQm4uE9AGPYxi8
Thank you! Taifun
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