The [Android Quickstart][1] tells people to install the [incorrect version of Java on Mac][2] and doesn’t tell [which version of Java is required on windows][3].
Installing Java 8 fixes both issues, though I have not (yet) tried installing Java 8 without first installing earlier versions (so I don’t know whether you can go straight to it or have to install old versions AND THEN Java 8).
https://docs.unrealengine.com/latest/INT/Platforms/Android/GettingStarted/1/index.html
[2]: 4.14.1 fails to launch on android from fresh Mac install with "Unsupported major.minor version 52.0" - Mobile - Epic Developer Community Forums
[3]: Android Package fail in 4.14.1 on Windows 10 "Unsupported major.minor version 52.0 - Mobile - Epic Developer Community Forums