When you use Android Studio 3.4 or Android Gradle plugin 3.4.0 and higher, R8 is the default compiler that converts your project’s Java bytecode into the DEX format that runs on the Android platform. However, when you create a new project using Android Studio, shrinking, obfuscation, and code optimization is not enabled by default. That’s because these compile-time optimizations increase the build time of your project and might introduce bugs if you do not sufficiently customize which code to keep.
So, it’s best to enable these compile-time tasks when building the final version of your app that you test prior to publishing. To enable shrinking, obfuscation, and optimization, include the following in your project-level