Fully protecting your Android mobile device involves all of the following procedures.
Tip: If your device has a search feature, use it as a shortcut for each procedure.
1. Securing Your Android Device 
2. Securing Your Data 
3. Securing Your Wireless Connections 
Helpful Links
Security Applications in Android Marketplace
Advanced Resources for Technical Users
This resource is for the technical audience interested in the inner workings of the Android OS. As of the time this page was published, the latest update covers 2018 and was published in March 2019.