Switch Android GPS programmatically [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

How can I enable or disable the GPS programmatically on Android?

I have searching on how to toggle GPS programmatically, the standard answer is that it's not possible.

If this is really the case how do all the various power/togg开发者_JAVA技巧le related widgets manage to toggle GPS with one click and no warning. The market place is full of examples that show it is possible.

So how?

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I've tested this on the emulator with 1.6 and it works.

How can I enable or disable the GPS programmatically on Android?

EDIT: This is not particularly allowed on the Android Market, and it stopped working as of android 2.3. I have also tested on a 2.1 emulator, and two actual devices with 2.2, and it worked on those.