How to extract code of apk file which is not working

Question

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  quot dex2jar classes dex quot  and press enter     now you get classes dex dex2jar file in the same folder         gt 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

User · Answer

Click here this is a good tutorial for both window/ubuntu.

apktool1.5.1.jar download from here.
apktool-install-linux-r05-ibot download from here.
dex2jar-0.0.9.15.zip download from here.
jd-gui-0.3.3.linux.i686.tar.gz (java de-complier) download from here.
framework-res.apk ( Located at your android device /system/framework/)

Procedure:

Rename the .apk file and change the extension to .zip ,

it will become .zip.

Then extract .zip.
Unzip downloaded dex2jar-0.0.9.15.zip file , copy the contents and paste it to unzip folder.
Open terminal and change directory to unzip “dex2jar-0.0.9.15 “

– cd – sh dex2jar.sh classes.dex (result of this command “classes.dex.dex2jar.jar” will be in your extracted folder itself).

Now, create new folder and copy “classes.dex.dex2jar.jar” into it.
Unzip “jd-gui-0.3.3.linux.i686.zip“ and open up the “Java Decompiler” in full screen mode.
Click on open file and select “classes.dex.dex2jar.jar” into the window.
“Java Decompiler” and go to file > save and save the source in a .zip file.
Create “source_code” folder.
Extract the saved .zip and copy the contents to “source_code” folder.
This will be where we keep your source code.
Extract apktool1.5.1.tar.bz2 , you get apktool.jar
Now, unzip “apktool-install-linux-r05-ibot.zip”
Copy “framework-res.apk” , “.apk” and apktool.jar
Paste it to the unzip “apktool-install-linux-r05-ibot” folder (line no 13).
Then open terminal and type:

– cd

– chown -R : ‘apktool.jar’

– chown -R : ‘apktool’

– chown -R : ‘aapt’

– sudo chmod +x ‘apktool.jar’

– sudo chmod +x ‘apktool’

– sudo chmod +x ‘aapt’

– sudo mv apktool.jar /usr/local/bin

– sudo mv apktool /usr/local/bin

– sudo mv aapt /usr/local/bin

– apktool if framework-res.apk – apktool d .apk

User · Answer

Note  All of the following instructions apply universally  aka to all OSes  unless otherwise specified     Prerequsites  You will need    A working Java installation A working terminal command prompt A computer An APK file   Steps  Step 1  Changing the file extension of the APK file   Change the file extension of the  apk file by either adding a  zip extension to the filename  or to change  apk to  zip   For example  com example apk becomes com example zip  or com example apk zip  Note that on Windows and macOS  it may prompt you whether you are sure you want to change the file extension  Click OK or Add if you re using macOS           Step 2  Extracting Java files from APK   Extract the renamed APK file in a specific folder  For example  let that folder be demofolder      If it didn t work  try opening the file in another application such as WinZip or 7-Zip  For macOS  you can try running unzip in Terminal  available at  Applications Terminal app   where it takes one or more arguments  the file to unzip   optional arguments  See man unzip for documentation and arguments   Download dex2jar  see all releases on GitHub  and extract that zip file in the same folder as stated in the previous point  Open command prompt  or a terminal  and change your current directory to the folder created in the previous point and type the command d2j-dex2jar bat classes dex and press enter  This will generate classes-dex2jar jar file in the same folder    macOS Linux users  Replace d2j-dex2jar bat with d2j-dex2jar sh  In other words  run d2j-jar2dex sh classes dex in the terminal and press enter   Download Java Decompiler  see all releases on Github  and extract it and start  aka double click  the executable application  From the JD-GUI window  either drag and drop the generated classes-dex2jar jar file into it  or go to File  gt  Open File    and browse for the jar  Next  in the menu  go to File  gt  Save All Sources  Windows  Ctrl Alt S  macOS      S   This should open a dialog asking you where to save a zip file named  classes-dex2jar jar src zip  consisting of all packages and java files   You can rename the zip file to be saved  Extract that zip file  classes-dex2jar jar src zip  and you should get all java files of the application    Step 3  Getting xml files from APK   For more info  see the apktool website for installation instructions and more Windows    Download the wrapper script  optional  and the apktool jar  required  and place it in the same folder  for example  myxmlfolder   Change your current directory to the myxmlfolder folder and rename the apktool jar file to apktool jar  Place the  apk file in the same folder  i e myxmlfolder   Open the command prompt  or terminal  and change your current directory to the folder where apktool is stored  in this case  myxmlfolder   Next  type the command apktool if framework-res apk   What we re doing here is that we are installing a framework  For more info  see the docs  The above command should result in  Framework installed      In the command prompt  type the command apktool d filename apk  where filename is the name of apk file   This should decode the file  For more info  see the docs   This should result in a folder filename out being outputted  where filename is the original name of the apk file without the  apk file extension  In this folder are all the XML files such as layout  drawables etc     Source  How to get source code from APK file - Comptech Blogspot

User · Answer

Any  apk file from market or unsigned  If you apk is downloaded from market and hence signed Install Astro File Manager from market  Open Astro  gt  Tools  gt  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   Download Dex2Jar zip from this link  SourceForge  Unzip the downloaded zip file   Open command prompt  amp  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   http   jd benow ca  download decompiler from this link   Open    targetapp apk dex2jar jar    with jd-gui File  gt  Save All Sources to sava the class files in jar to java files

User · Answer

step 1   Download dex2jar here  Create a java project  and paste  dex2jar-0 0 7 11-SNAPSHOT lib   jar files   Copy apk file into java project Run it and after refresh the project  you get jar file  Using java decompiler you can view all java class files  step 2  Download java decompiler  here

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