Can WIFI be turned off programmatically

Question

How can wifi be turned off/on programmatically and do is rooted or system app required for this.

Answer 1

WIFI_ON is a secure setting; only apps signed by the system firmware will be able to hold the proper permission and adjust it using the SDK.

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UPDATE

setWifiEnabled() probably supports this, as was pointed out in the comments. I don't see evidence of a permission being required, but if there is one, you'll get a stack trace that should point out what's needed. My apologies for forgetting about this path.