Flutter debug Apk decompile to get the source code

Question

I have lost the source code of my flutter application due to drive corruption, but I have my debug.apk in my android phone. How can I decompile the Flutter apk to get source code? I have tried decompiling it using decompilers but it is not giving my source code as the Flutter source code is in Dart language.

Eucaine

Possible duplicate of Is there a way to get the source code from an APK file? – Volga

flutter applications source code is in dart language , can java decompilers decompile other language code ? – Eucaine

try it and let us know – Volga

sure , btw I recovered my project using easeus and now its running fine. Thanks for your concern . – Eucaine

@F-1 I have tried decompiling the apk and I am not getting my dart code . – Eucaine

@estn I am new to this community sir , I haven't asked a duplicate question but it is showing this question may have an answer here . can you please tell me sir how to remove that . I already edit my question with more specific info but it is still showing the same. – Eucaine

@JagrajSingh have you find a solution? – Bothersome

@LuigiSaggese No , not yet . btw I had tried java decompilers but got nothing . – Eucaine

@JagrajSingh The same question as Luigi: do you have a solution now? – Nervy

Well I tried @user3467955 's answer and I got small code snippets rather full code. You could try that . – Eucaine

Better use github/gitlab :) – Butyrate

Answer 1

If your debug.apk is in debug mode then you can use apktool in order to extract the components of the apk (I'm using the word extracting since apk is a zip file).

Flutter, in debug mode, keeps the source code (with comments!) in the file kernel_blob.bin. Thus, using the following command should help you extract the code into a file:

strings /path/to/extracted/apk/assets/flutter_assets/kernel_blob.bin > extracted_code.dart

Please, pay attention - You'll need to clean 'extracted_code.dart', from irrelevant/garbage strings.

Try to search strings like "dart", "import", "void" and other keywords in 'extracted_code.dart', it will help you find the code itself.

Here's an example from my Ubuntu:

If the apk is compiled in "release" mode, extracting the code will be much harder, since the code is compiled into isolate_snapshot_instr file, which is not a raw arm assembly, and is only deserialized using the Flutter engine in run-time. You can read more about it here

Hienhieracosphinx

Better search for filename, your class names, or some regex like runApp\(.*\(\)\); in vscode or using sed. Because the file would be very big eg: 25MB and 470850 lines. – Butyrate

Please how do i perform this operation on windows. Windows can't seem to find command "strings". Thanks – Hootchykootchy

Hey, you can [learn.microsoft.com/en-us/sysinternals/downloads/… strings) for your Windows machine – Hienhieracosphinx

medium.com/@rondalal54/… – Richart

REALLY THANKS!!! It works. Was writing a game with my son, and everything got lost during Git operations. And this helped! There was a lot of byte code, but search by file and variable names worked. – Cooperage