How to convert AAR to JAR

Question

Situation    I intend to use a Java library and I only have an AAR file from a Maven repository but I need the JAR file   Background story    I tried to compile a library  but its Gradle structure was unstable  So I asked for a compiled jar file  and its developer handed me an aar file from some Maven repository  the developer couldn t compile his own project   The Gradle configuration was a mess  it depended on multiple libraries and Gradle has thrown some exceptions   I tried to use it in my IDEA IDE  but it couldn t see it  A library project should be able to be compiled into a jar file  right   Question   What should I do to convert that AAR file to a JAR file

User · Answer

The  aar  bundle is the binary distribution of an Android Library Project   aar file   consists a JAR file and some resource files  You can convert it  as  jar file using this steps  1  Copy the  aar file in a separate folder and Rename the  aar file to  zip file using   any winrar or zip Extractor software   2  Now you will get a  zip file  Right click on the  zip file and select  Extract files     Will get a folder which contains  classes jar  resource  manifest  R java   proguard optional   libs optional   assets optional     3  Rename the classes jar file as yourjarfilename jar and use this in your project       Note  If you want to get only  jar file from your  aar file use the   above way        Suppose If you want to include the manifest xml and resources with your  jar file means       you can just right click on your  aar file and save it as  jar file directly instead of       saving it as a  zip  To view the  jar file which you have extracted  download JD-GUI Java Decompiler   Then drag and drop your  jar file into this JD GUI  you can see the  class file in readable formats like a  java file

User · Answer

Android Studio  version  1 3 2  allows you to seamlessly access the  jar inside a  aar   Bonus  it automatically decompiles the classes   Simply follow these steps    File  gt  New  gt  New Module  gt  Import  JAR  AAR Package to import you  aar as a module Add the newly created module as a dependency to your main project  not sure if needed  Right click on  classes jar  as shown in the capture below  and click  Show in explorer   Here is your  jar

User · Answer

As many other people have pointed out  just extracting the  jar from the  aar file doesn t quite cut it as resources may be missing   Here are the steps that worked for me  context of Android  your mileage may vary if you have other purposes     Rename the  aar file to  zip and extract  The extracted folder is an ADT project that you can import in Eclipse with some minor modifications  see below   In the extracted folder rename the contained file classes jar to whatever you like  in this example myProjectLib jar  and move it to the lib folder within the extracted folder  Now in order for Eclipse to accept it you need to put two files into the extracted folder root     project  classpath  To do that  create a new Android dummy project in Eclipse and copy over the files  or copy over from an existing Android project  Open the  project file and look for the XML name tag and replace the contents of it with myProjectLib  or whatever you called your jar file above  and save  Now in Eclipse you can File -  New -  Project -  Android Project from existing source   and point to the extracted folder content  After import right click on the newly created project  select Properties -  Android  and check Is Library  In your main project that you want to use the library for  also go to Properties -  Android and add the newly added myProjectLib to the list of dependencies

User · Answer

For those  who want to do it automatically  I have wrote a little two-lines bash script which does next two things    Looks for all   aar files and extracts classes jar from them Renames extracted classes jar to be like the aar but with a new extension  find   -name    aar  -exec sh -c  unzip -d  dirname        classes jar     find   -name    aar  -exec sh -c  mv  dirname     classes jar  echo      sed s aar jar g         That s it

User · Answer

Resource based  aar-projects  Finding the classes jar file inside the  aar file is pretty trivial  However  that approach does not work  if the  aar-project defined some resources  example  R layout xyz    Therefore deaar from CommonsGuy helped me to get a valid ADT-friendly project out of an  aar-file  In my case I converted subsampling-scale-image-view  It took me about an hour to set up ruby on my PC  Another approach is using android-maven-plugin for Eclipse ADT as CommonsGuy writes in his blog  Yet another approach could be  just cloning the whole desired project as source from git and import it as  Existing Android project

User · Answer

If you are using Gradle for your builds - there is a Gradle plugin which allows you to add aar dependency to your java kotlin scala     modules    https   github com stepango aar2jar  plugins       id  java      id  com stepango aar2jar  version    0 6        lt - this one    dependencies       compileOnlyAar  com android support support-annotations 28 0 0      lt - Use any AAR dependencies

User · Answer

aar is a standard zip archive  the same one used in  jar   Just change the extension and  assuming it s not corrupt or anything  it should be fine   If you needed to  you could extract it to your filesystem and then repackage it as a jar   1  Rename it to  jar 2  Extract  jar xf filename jar 3  Repackage  jar cf output jar input-file s

User · Answer

The AAR file consists of a JAR file and some resource files  it is basically a standard zip file with a custom file extension   Here are the steps to convert    Extract the AAR file using standard zip extract  rename it to   zip to make it easier  Find the classes jar file in the extracted files Rename it as you like and use that jar file in your project

[java] How to convert AAR to JAR

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