Android Builds failing : No toolchains found in the NDK toolchains

The simplest option is to just upgrade Android Gradle plugin as @viktorbenei linked: config update for NDK r18 by viktorbenei 路 Pull Request #5 路 bitrise-io/sample-apps-android-sdk22 路 GitHub
You may also need to add google() repository to buildscript block if needed and upgrade Gradle wrapper if it is not compatible with desired AGP version: Android Gradle plugin release notes  |  Android Studio  |  Android Developers.

At the time of writing the current version is 3.2.1 but minimal supporting NDK r17+ is AFAIR 3.1.0.

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