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Decompiling Android .apk file


Follow the procedure given below, to retrieve source from an apk file.

1.      Start with renaming the extension of file from .apk to .zip (e.g.: rename from filename BuyCokeAndroid.apk to filename BuyCokeAndroid.zip) it automatically converted into zip file and then extract it. If you open extracted file, you will able to see “classes.dex” file.

2.      Convert “classes.dex” to “classes.jar”. To convert into jar file use the tool “dex2jar”. Download on this link http://code.google.com/p/dex2jar/downloads/list  and then extract it in same folder where the classes.dex file is located.

3.      Now, open command prompt and reach to the folder where the classes.dex file is located.
For e.g. c:\Users\v.nadeshan\apk decompile\BuyCodeAndroid>
Windows: - Then type the command “dex2jar classes.dex” next to above path. c:\Users\v.nadeshan\apk decompile\ BuyCodeAndroid> dex2jar classes.dex and enter
Mac: - Then type the command “sh dex2jar.sh classes.dex” next to above path. c:\Users\v.nadeshan\apk decompile\ BuyCodeAndroid> dex2jar classes.dex and enter and press enter.
Output: - You get classes.dex.dex2jar file in the same folder.

4.      Now, download java decompiler from http://java.decompiler.free.fr/?q=jdgui and double click on jd-gui.exe and java Decompiler window is displayed. Open classes.dex.dex2jar file in Java Decompiler and then you can see the source files in the jd-gui window. You can save the source files by selecting File>Save All Sources option and you will get the source files as zip.

5.      Download apktool and it dependencies to retrieve correct xml files like layout files and Android-Manifest.xml file. Download apktool from http://code.google.com/p/android-apktool/downloads/detail?name=apktool1.5.2.tar.bz2&can=2&q= and for it dependencies download from http://code.google.com/p/android-apktool/downloads/detail?name=apktool-install-windows-2.2_r01-3.tar.bz2. Extract both zip files and put the content in the same folder where the .apk file is located i.e. BuyCokeAndroid folder.

6.       Download framework-res.apk file and put it in same folder where the .apk file is located i.e. BuyCokeAndroid folder.

7.       Now, open command prompt and Navigate to the directory where your .apk file is located (c:\Users\v.nadeshan\apk decompile\BuyCodeAndroid>)and type the following command

Command 1

Windows: - Then type the command “apktool if framework-res.apk” next to above path. c:\Users\v.nadeshan\apk decompile\ BuyCodeAndroid> apktool if framework-res.apk and enter
Mac: - Then type the command “sh apktool if framework-res.apk” next to above path. c:\Users\v.nadeshan\apk decompile\ BuyCodeAndroid> sh apktool if framework-res.apk and enter and press enter.
Output: - you get a file folder in that folder and now you can easily read xml files also.
            
Command 2

Windows: - Then type the command “apktool d “framework-res.apk”” next to above path. c:\Users\v.nadeshan\apk decompile\ BuyCodeAndroid> apktool d “framework-res.apk” and enter.
Mac: - Then type the command “sh apktool d “framework-res.apk” next to above path. c:\Users\v.nadeshan\apk decompile\ BuyCodeAndroid> sh apktool d “framework-res.apk and enter and press enter.
Output: - you get a file folder in that folder (framework-res) and now you can easily read AndroidManifest files also.

"Happy Testing"

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