Fixed error that periodic updates never started due to buggy code. The
code used from Google Developer used sharedpreferences to store and
retrieve user preferences for enable/disable periodic updates. This were
without any reason implemented in the code and the value was always
false.
Now, periodic updates are working. Next step to configure and optimize
the LocationChanged method.
Check if Location Serices are enabled and pop upp an alert dialog
implemented.

Through the alertdialog the user can be redirected to the device's
location configuration settings and change the Location Mode