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Editorial Team
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Asked: 2026-06-09T04:41:17+00:00

Actually I was trying to extract code of a .apk file called cloudfilz.apk and

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Actually I was trying to extract code of a .apk file called cloudfilz.apk and wanted to manipulate in its source code so I followed the steps given below:-

make a new folder and put .apk file (which you want to decode) now rename this .apk file with extension .zip (eg: rename from filename.apk to filename.apk.zip) and save it..now you get classes.dex files etc…at this stage you are able to see drawable but not XML and java file…so continue…

Step 2:

now extract this zip apk file in the same folder(in this eg or case NEW FOLDER). now download dex2jar from this link http://code.google.com/p/dex2jar/ and extract it to the same folder (in this case NEW FOLDER)…..now open command prompt and reach to that folder (in this case NEW FOLDER)….after reaching write "dex2jar classes.dex" and press enter…..now you get classes.dex.dex2jar file in the same folder……

=>Question:-I was successful to achieve step 1 but in step2 when I am executing dex2jar classes.dex I am getting an error on command prompt java.lang.UnsupportedClassVersionError ,I know this is due to incompatibility between my installed JDK version and classes.dex JDK version number so stuck here and don’t have way out…

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1 Answer

  1. Editorial Team

    Any .apk file from market or unsigned

    1. If you apk is downloaded from market and hence signed Install Astro File Manager from market. Open Astro > Tools > Application Manager/Backup and select the application to backup on to the SD card .
      Mount phone as USB drive and access ‘backupsapps’ folder to find the apk of target app (lets call it app.apk) . Copy it to your local drive same is the case of unsigned .apk.

    2. Download Dex2Jar zip from this link: SourceForge

    3. Unzip the downloaded zip file.

    4. Open command prompt & write the following command on reaching to directory where dex2jar exe is there and also copy the apk in same directory.

      dex2jar targetapp.apk file(./dex2jar app.apk on terminal)

    5. http://jd.benow.ca/ download decompiler from this link.

    6. Open ‘targetapp.apk.dex2jar.jar’ with jd-gui
      File > Save All Sources to sava the class files in jar to java files.

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