[ Solution ] Unity 2019.1.8f 64bit Build

1. Ndk file Download 

https://developer.android.com/ndk/downloads/older_releases.html

 

 

 

2. Set the build Type

Project Settings => Player => Other Settings 

- Scripting Backend = IL2CPP

- ARM64 Checked.

 

3. Ndk Direction Setting : Downloaded Ndk Path Config.