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How to Decompile Apk To Source

Posted by vignesh on June 25, 2013 at 3:30pmView Blog

Several times while testing with robotium we face the issues(since we have only apk and not code), So inorder to

overcome it i used to decompile the application(apk) , Ok follow these steps

You will need-

1. Eclipse IDE2. Java Runtime (of course)

3. JD-GUI or JD Eclipse plugin

4. DexToJar (get them from here: http://code.google.com/p/dex2jar/)

And now follow the steps

Step 1: Create a java project, name it DexToJava.

Welcom e to Mobile QA Zon e, a Nex t Gen er a t ion Softw a r e Test in g Com m u n ity .

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Step 2: Create a folder and name it libs. Paste all jars file in the libs folder after extracting dex2jar-0.0.9.8.tar.gz . Go tobuild path. Add all the jars in the build path.

Step 3: You are almost done. Get an apk file and paste it in your project. For me it is facebook.apk.

Step 4: right click on project and select run as. Set main class: com.googlecode.dex2jar.v3.Main

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Step 5: Set Argument facebook.apk and now click on apply and run it.

Step 6: after completing the job, you will find on console:

Step 7: now refresh the project, and you will find facebook_dex2jar.jar. And you know already how to get java source

from jar. Use JD-GUI.

Note : this method wont work if code is obfuscated with third party like proguard ,i will share that method in detail later

AND if you feel its too large to do , for u some shareware tools like Androchef will do for u

Linux :

before this download dex2jar ,and jdgui for your gnome/kde editions

(assumption my.apk is in my home folder)1.First step is to extract the “classes.dex” file from the APK:

123

command :$ unzip program.apk classes.dex

Archive: program.apk

inflating: classes.dex

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2.Now, we use the tool dex2jar to convert the classes.dex file to Java .class files:here is the Link for dex2jar :http://code.google.com/p/dex2jar/download it and unzip in home, as my .apk in home then run the command

1234

$ bash dex2jar/dex2jar.sh ./classes.dex

version:0.0.7.8-SNAPSHOT

2 [main] INFO pxb.android.dex2jar.v3.Main - dex2jar ./classes.dex -> ./classes.dex.dex2jar.jar

Done.

Above command convert .dex file in to .jar file so we can us jd-gui to open the file

3. From here we obtain the file “classes.dex.dex2jar.jar”, now we can use the java decompiler JD-GUI toextract the source code:link for jd-gui http://java.decompiler.free.fr/?q=jdgui

1command $ ./jd-gui classes.dex.dex2jar.jar

this command opens the jd-gui then you can navigate to classes.dex.dex2jar.jar(File then save as ur desired name.Which contain java file in readable format.

hope its usefull

thanks & regards

C.vignesh

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Tags: apk, decompilation, hacks, source, tips

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Comment by Sameena on September 30, 2013 at 3:36pm

Hi Vignesh,

Can you provide some more details for step 5 described above.

Like 0

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Below message is displayed in console: this cmd is deprecated, use the d2j-dex2jar if possible

dex2jar file1.dexORapk file2.dexORapk ...dex2jar version: translator-0.0.9.15.

Thanks in Advance.

Regards,

Sameena

Comment by Vjkumran on August 2, 2013 at 8:26pm

Simple way to decompile android apk file

http://qa-vijaynadeshan.blogspot.in/

Comment by Shanudeen on June 25, 2013 at 4:06pmThanks...

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