Decompiling the apk to get back into the source code is what you should do to analyze the type of information an attacker might gain during reverse engineering the apk.
What do you mean by decompiling?
Decompiling is the process of converting executable or ready-to-run program code, often known as object code, into a more human-friendly higher-level programming language.
Decompiling is a type of reverse engineering, that does the processes a compiler does not. The term "decompiler" refers to a computer application that converts an executable file into high-level source code that can be successfully recompiled.
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