ProGuard Secure your APK from Reverse Engineering in Android

Following are words from http://proguard.sourceforge.net who are inventor of it.

ProGuard is a free Java class file shrinker, optimizer, obfuscator, and preverifier. It detects and removes unused classes, fields, methods, and attributes. It optimizes bytecode and removes unused instructions. It renames the remaining classes, fields, and methods using short meaningless names.

signing apk flow
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