The build method is:
nix develop
scripts/ndk-make.sh
./gradlew assembleDebug
It can only build debug version.How to build release version of deltachat android?
concrats that you can build a version at all! 
usually, the debug version is fine to help on development, testing, whatnot.
for further help: as it is a lot of work to dive into these kind of questions, helping ppl to set up their development environment: can you elaborate on your usecase? help on a concrete feature? create a fork? that would make it more probable to get help 
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