Question

I want the code to check whether GPS in my phone ids on or off?

Answer 1

Use Location Provider :

    try {
    LocationProvider lp = LocationProvider.getInstance(null);
    if (lp == null) {
        //Device doesn't currently have GPS enabled
    } else {
        //Device has GPS enabled
    }
} catch (LocationException le) {
     //Device's GPS is currently permanently disabled
}

Credit: aligf

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