Always Consider the following Important Points while using Google API’s in your Mobile App:
Do not ask your consumer about tracking permission initially. 35% of people end up uninstalling the App if they are asked for this permission at the beginning of the App. Seek Tracking permission when the user lands on a screen where Tracking is actually required
Do not Track the user when he is not using your app. If that is an important feature of the App then inform the user through some icon that you are Tracking him
Google API’s are not free always. After almost 10000 hits per month, Google charges a Nominal Fee. So be ready for that
