With NDK we can store api key in an .so file, making it very hard for the attacker (.so files can hardly be
decompiled, and disassembling those files is far from being a comfortable option).
When you have 3rd party library static api key eg Firebase app_key, app_secret that need to be in application code base to run the apk
then we can use this mechanism. Also the REST api server url https:// can be added there