Android Question What is the "install" event in Android?

I accomplish this by having a Map file of parameters that I store in the DirDefaultExternal (some people say DirDefaultInternal is a better choice) directory.

In Activity_Create, if the Map file does not exist I initialize it (including setting NewInstall=True), otherwise I read it using File.ReadMap.

In Activity_Resume I show the status message if NewInstall is true, then set NewInstall to false.

In Activity_Pause I save the map file using File.WriteMap

When your app launches for the first time, try creating a small file (like update.txt). If it already exists then that must mean it is an update.