APKRepatcher

APKRepatcher helps you to modify an existing apk using a simple user friendly GUI. It lets you edit java/smali code from an APK and rewrite the changes back to the modified signed APK. Additionally, it provides you option to convert Dex, Jar, Class, Smali, Class from one format to another. APKRepatcher makes use of dex2jar, jadx, rsyantaxtextarea, zip4j, apktool

**Main Website (Contains Tutorial/Screenshots): **
https://cooltrickshome.blogspot.in/2017/03/apkrepatcher-now-decompile-recompile.html

Features:
Decompiles/Recompiles the APK.
Provides an editor to change the decompiled java code.
Compiles the code using javac and saves the updated class.
Allows you to view smali version of your modified java code.
Allows you to edit smali from the original apk or from your modified java code
Smali changes once saved would be reflected back in updated apk after building project.
Build features re-creates new apk with all code changes and lastly it would resign the apk.
Basic features like find/replace/increase or decrease font are also provided.
It also allows you to convert from Dex to Jar/Class/Smali/Java, Jar to Dex/Java, Class to Dex/Smali, Smali to Class/Java/Dex. Also allows to extract and sign any apk.
Allows you to change the amount of memory utilized by APKRepatcher.
Platform independent
Patch Module using Advanced Section (explained on website)
100% Free

GUI Menus:

File
Open apk (CTRL+O)- Takes the input apk which need to be modified and extracts it inside <apkrepatcher_software_dir>/Projects/<apk_name_folder>/
Open Project (CTRL+P)– You can reopen the project created from open apk anytime using this feature. Just point it to <apk_name_folder> inside Projects directory.
Compile & Save (CTRL+S) – Saves & Compile the java code which is currently shown on the GUI editor.
Build APK (CTRL+B) – Recreates a newly signed apk with the changed code.</apk_name_folder></apk_name_folder></apkrepatcher_software_dir>

Edit
Increase Code FontSize (CTRL+I) – Allows you to increase font size of shown code.
Decrease Code FontSize (CTRL+D) – Allows you to decrease the font size of shown code.
Remove all tabs – Removes all currently shown tabs.

Extra
Extract APK-APKTool – User can provide any apk for extraction using this option
Convert Dex to Jar – User can convert any of dex file to jar format using this option
Convert Dex to Class – User can convert any of dex file to class file using this option
Convert Jar/Class to Dex – User can convert any of jar/class file to dex format using this option
Convert Class to Smali – User can convert any of class file to smali format using this option
Convert Smali to Class – User can convert any of smali file to class format using this option
Convert Smali to Java – User can convert any of smali file to java format using this option
Convert Dex to Smali – User can convert any of dex file to smali format using this option
Convert Smali to Dex – User can convert any of smali file to dex format using this option
Convert Dex/Jar to Java – User can convert any of dex/jar file to java format using this option
Sign your apk – User can resign any apk using this option

Advanced
Edit Smali using current code – Rewrite the smali version of the currently visible java code. This features requires the java code to be compilable in order to convert to smali.
Edit Smali using original APK – This features opens the smali version of the java class from the original apk. Since it is extracted from original apk so no need of current java code to be compilable
Save and apply smali changes – After you have edited smali code, you need to save it so that it gets reflected in modified apk.

Settings
Change Memory Allocation – User is allowed to change the amount of memory reserved by APKRepatcher. Default is 1500mb or 1.5 GB

Help
Update Software – Helps you to update the current software if any update is available
How to use APKRepatcher – Contains the documentation of APKRepatcher.

Toolbar
Allows you to find in current code/replace/replaceAll/find all class

Extra Software Content:

APKRepatcher_lib Folder
It comes along with the software
Contains the helper jars used by program
APKRepatcher_lib\userLibrary is automatically added in classpath while compiling code. If you wish to compile your code using external jars then place those external jars inside APKRepatcher_lib\userLibrary

Settings.txt File
Contains the memory utilized by APKRepatcher.