How to export library to Jar in Android Studio

Question

I have downloaded some library sources  and would like to export it as a Jar file using Android Studio  Is there a way to export to jar file using Android studio    edit    The library I want to export as jar is an Android library  It s called  StandOut  and can be downloaded from GitHub   https   github com pingpongboss StandOut

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Since Android Studio V1 0 the jar file is available inside the following project link    debug ver   your app  build intermediates bundles debug classes jar  release ver   your app  build intermediates bundles release classes jar  The JAR file is created on the build procedure  In Android Studio GUI it s from Build- Make Project and from CMD line it s  gradlew build

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It is not possible to export an Android library as a jar file  It is possible  however  to export it as aar file  Aar files being the new binary format for Android libraries  There s info about them in Google I O  the New Build System video   First  build the library in Android Studio or from command line issuing gradle build from your library s root directory    This will result in  lt yourlibroot gt  libs build yourlib aar file   This aar file is a binary representation of your library and can be added to your project instead of the library as a dependency project    To add aar file as a dependency you have to publish it to the maven central or to your local maven repository  and then refer the aar file in your project s gradle build file   However  this step is a bit convoluted  I ve found a good explanation how to do so here    http   www flexlabs org 2013 06 using-local-aar-android-library-packages-in-gradle-builds

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We can export a jar file for Android library project without resource files by Android studio  It is also requirement what I met recently   1  Config your build gradle file         Task to delete old jar      task clearJar type  Delete          delete  release lunademo jar                task to export contents as jar     task makeJar type  Copy           from   build intermediates bundles release           into   build libs           include   classes jar          rename  classes jar    lunademo jar             makeJar dependsOn clearJar  build    2  Run gradlew makeJar under your project root  You will see your libs under dir as build libs  if you are luckily                                                                 If you met issue as  Socket timeout exception  on command line as below     You can follow this steps to open Gradle window in the right part  and click  makeJar  on Android studio like this       Then go to build libs dir  you will see your jar file    Hope that it is helpful for u    Good Luck      Luna

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I was able to build a library source code to compiled  jar file  using approach from this solution  https   stackoverflow com a 19037807 1002054 Here is the breakdown of what I did  1  Checkout library repository In may case it was a Volley library 2  Import library in Android Studio  I used Android Studio 0 3 7  I ve encountered some issues during that step  namely I had to copy gradle folder from new android project before I was able to import Volley library source code  this may vary depending on source code you use  3  Modify your build gradle file    If your module is a library project  this is needed   to properly recognize  android-library  plugin buildscript       repositories           mavenCentral             dependencies           classpath  com android tools build gradle 0 6 3           apply plugin   android-library   android       compileSdkVersion 17     buildToolsVersion   17      sourceSets           main                   Here is the path to your source code             java                   srcDir  src                                      This is the actual solution  as in https   stackoverflow com a 19037807 1002054 task clearJar type  Delete        delete  build libs myCompiledLibrary jar     task makeJar type  Copy        from  build bundles release        into  build libs        include  classes jar       rename   classes jar    myCompiledLibrary jar      makeJar dependsOn clearJar  build   4  Run gradlew makeJar command from your project root  I my case I had to copy gradlew bat and gradle files from new android project into my library project root  You should find your compiled library file myCompiledLibrary jar in build libs directory  I hope someone finds this useful  Edit  Caveat Althought this works  you will encounter duplicate library exception while compiling a project with multiple modules  where more than one module  including application module  depends on the same jar file  eg  modules have own library directory  that is referenced in build gradle of given module   In case where you need to use single library in more then one module  I would recommend using this approach  Android gradle build and the support library

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Include the following into build gradle   android libraryVariants all   variant - gt      task  generate  variant name Javadoc   type  Javadoc            description  Generates Javadoc for  variant name           source   variant javaCompile source         ext androidJar      android plugin sdkDirectory  platforms   android compileSdkVersion  android jar          classpath   files variant javaCompile classpath files    files ext androidJar             task  javadoc  variant name    type  Jar            classifier    javadoc          description  Bundles Javadoc into a JAR file for  variant name           from tasks  generate  variant name Javadoc               task  jar  variant name    type  Jar            description  Bundles compiled  class files into a JAR file for  variant name           dependsOn variant javaCompile         from variant javaCompile destinationDir         exclude     R class       R   class       R html       R   html            You can then execute gradle with    gradlew clean javadocRelease jarRelease which will build you your Jar and also a javadoc jar into the build libs  folder   EDIT  With android gradle tools 1 10   getting the android SDK dir is different than before  You have to change the following  thanks Vishal     android sdkDirectory    instead of  android plugin sdkDirectory

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Here s yet another  slightly different answer with a few enhancements   This code takes the  jar right out of the  aar  Personally  that gives me a bit more confidence that the bits being shipped via  jar are the same as the ones shipped via  aar   This also means that if you re using ProGuard  the output jar will be obfuscated as desired   I also added a super  makeJar  task  that makes jars for all build variants   task makeJar   lt  lt           Empty  We ll add dependencies for this task below       Generate jar creation tasks for all build variants android libraryVariants all   variant - gt      String taskName    makeJar  variant name capitalize             Create a jar by extracting it from the assembled  aar        This ensures that products distributed via  aar and  jar exactly the same bits     task  taskName  type  Copy            String archiveName      project name -  variant name           String outputDir      buildDir getPath    outputs           dependsOn  assemble  variant name capitalize             from zipTree    outputDir  aar   archiveName  aar            into    outputDir  jar            include  classes jar           rename   classes jar      archiveName -  variant mergedFlavor versionName  jar              makeJar dependsOn tasks taskName      For the curious reader  I struggled to determine the correct variables and parameters that the com android library plugin uses to name  aar files   I finally found them in the Android Open Source Project here

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I was able to export a jar file in Android Studio using this tutorial  https   www youtube com watch v 1i4I-Nph-Cw   How To Export Jar From Android Studio    I updated my answer to include all the steps for exporting a JAR in Android Studio   1  Create Android application project  go to app- build gradle  2  Change the following in this file    modify apply plugin   com android application  to apply plugin   com android library  remove the following  applicationId  versionCode and versionName Add the following code        Task to delete old jar task deleteOldJar type  Delete      delete  release AndroidPlugin2 jar          task to export contents as jar task exportJar type  Copy        from   build intermediates bundles release        into   release        include   classes jar       rename  classes jar    AndroidPlugin2 jar     exportJar dependsOn deleteOldJar  build    3  Don t forget to click sync now in this file  top right or use sync button    4  Click on Gradle tab  usually middle right  and scroll down to exportjar  5  Once you see the build successful message in the run window  using normal file explorer go to exported jar using the path  C  Users name AndroidStudioProjects ProjectName app release you should see in this directory your jar file   Good Luck

[android] How to export library to Jar in Android Studio?

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