Check if Google's location Service is enabled

Check if Google's location Service is enabled by the user, else open Settings > Location so the user enables them.
First get the
String locationProviders = Settings.Secure.getString(getContentResolver(),Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
contains "network" or "gps" or both values separated by comma.

If the string is empty => Google Location Service is closed and you have to prompt the user to open it. Wifi might or not be open.
If the string equals "network" => WiFi and Google Location Service are enabled.
If the string equals "network,gps" => WiFi and GPS and Location Service are enabled.

We need to create a Dialog and ask the user to take the action he wants. In our case we want the user when she clicks Yes to open the Settings > Location , so she can enable the Location Service.
We can achieve that with ACTION_LOCATION_SOURCE_SETTINGS.

The code is :

     if (locationProviders == null || locationProviders.equals("")) {
         
            new AlertDialog.Builder(this)
            .setTitle("Enable Location Service")
            .setMessage("This Application requires the use of Google Location's service.  " +
                    "Do you wish to enable this feature")
            .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    // show system settings
                    startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
                }
            })
            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    // do nothing
                }
            })
            .show();
}

Link : http://stackoverflow.com/questions/10311834/android-dev-how-to-check-if-location-services-are-enabled