Changing and Recompiling Android source code

Question

After decompiling an Android application, I am able to view its source code/Java classes by opening the classes.dex file using jd-gui. I need to add a few lines of code to the application before recompiling it and installing the modified app onto a phone. The problem is that even though I can view the source code, I am unable to add code to it. Is there anyway I can add code to the application instead of only being able to view it? I have tried importing into Eclipse, but I cannot obviously import the classes.dex file, and need a way to do that.

You can't change the APK directly like this. You need to go all the way through the pipeline: Java source -> Java bytecode -> Dex bytecode -> package the APK -> sign the APK. By the way, what are you trying to achieve? To hack a someone else's app? — Natix
– Natix, Commented Jul 8, 2014 at 15:54
maybe ask for someone's code and then add your few lines if you get the source — marcus m
– marcus m, Commented Jul 8, 2014 at 15:57

Lazy · Accepted Answer · 2014-07-08 16:05:57Z

1

You have to use APKTool. Also check out this Smali coding guide. Not easy as you think.

answered Jul 8, 2014 at 16:05

Lazy

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