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Please do not split topics across several threads. This makes following the conversation in the threads view very hard as the context of the other messages is missing. If you have additional information either edit the original message or post to its thread. Regarding the problem, That doesn't seem to be Gradle related, other than that you use Gradle to run the build.

adb

cannot be found and the error even suggests what you should use to check the build environment. But you should probably seek for some help in a react native or Android community instead.