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Can't install on my Xiaomi Mi 4.

What Android API features does this app use that are not available on the Android version I have installed?

Which Android version are you using? I am not using anything extraordinary, Room, Support Library and Design Library as external dependencies.

Android Version: 4.4.4 KTU84P

MIUI Version: 7

You are using API 19 where minimum API level is 21. The 21 is used because I am using Vector Assets Generator.