Android Studio Add jar as library

Question

I m trying to use the new Android Studio but I can t seem to get it working correctly   I m using the Gson library to serialize deserialize JSON-objects  But the library somehow isn t included in the build   I had created a new project with just a MainActivity  Copied gson-2 2 3 jar in the  libs folder and added it as a library dependancy right click- Add as library   This includes the jar in android studio so it can be referenced from the source files   When I try to run the project it cannot compile so I added   compile files  libs gson-2 2 3 jar     to the dependencies in de  gradle file  After that it compiles correctly but when running the application I get a ClassDefNotFoundException   Does anyone know what I m doing wrong

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In my case the added library missed some dependencies  but unfortunately Android Studio  0 8 14  has kept this as a secret   There was no need to manually configure anything  I just added the missing libraries and used the default dependency configuration in the app build gradle file  like this  dependencies       compile  com google code gson gson 2        compile fileTree dir   libs   include      jar

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I made it work by just adding one line to build gradle   dependencies       implementation fileTree dir   libs   include      jar    ---- gt  AS creates this     implementation  com google code gson gson 2 3 1    ---------- gt  I added this one     Do not forget to click Sync now in the top right corner   I m using Android Studio 1 0 1

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compile fileTree dir   libs   include     jar   works fine but not compile files      have tested with Studio Beta 0 8 1

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On Mac OS X     Add jar as library  drag jar to libs  right click add as lib   Add compile statement to build grade Install gradle v1 6  use homebrew    brew install gradle  gradle -v  if not v1 6  upgrade homebrew  gradle clean  rebuild android did not work     This sorted me out

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I don  know why but my Android Studio 0 8 14 goes crazy when I try to implement these solutions using Gradle  I admit my poor knowledge of this great build tool but what does Studio mutilate my project for  I manage to get it working this way  put android-support-v13 jar into  libs  directory  then F4 on my project and add File dependency where I pointed android-support-v13 jar

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DO this    Create libs folder under the application folder  Add  jar files to libs folder  Then add  jar files to app s build gradle dependency  Finally Sync project with Gradle files

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For newer Android 1 0 2 the following is already there in your build gradle file  implementation fileTree include      jar    dir   libs     Add the library jar to your libs folder -  right click the library -  click add as a library -  it asks you for the project to add it for -  select your project-  click ok The following line is automatically added to build gradle  implementation files  libs android-query jar     That did it for me  nothing more was required  i have shown this for android aquery another third party library for android

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IIRC  simply using  quot Add as library quot  isn t enough for it to compile with the project  Check Intellij s help about adding libraries to a project The part that should interest you the most is this    In File  gt  Project Structure  Open the module settings and select the Dependencies tab  On the Dependencies tab  click add and select Library  In the Choose Libraries dialog  select one or more libraries and click Add Selected   If the library doesn t show up in the dialog  add it in the Libraries settings  right below Modules  You shouldn t need to add compile files   anymore  and the library should be properly added to your project

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Ive done above 3 steps and its work charm for me    I am using Android Studio 2 1 2     Step 1   Add your jar package name  as an example compile  com squareup okhttp3 okhttp 3 3 1   into gradle build script under build gradle Module app       Step 2  Right click on app folder -  New -  Module    Step 3  Click Import JAR  AAR Package Then browse your package  as an example  OkHttp jar

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In the project right click   - gt  new - gt  module - gt  import jar AAR package - gt  import select the jar file to import - gt  click ok - gt  done   Follow the screenshots below   1     2     3     You will see this

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1  create an  your libs  folder inside the Project app src folder   2  Copy your jar file into this  your libs  folder  3  In Android Studio  go to File -  Project Structure -  Dependencies -  Add -  File Dependency and navigate to your jar file  which should be under  src your libs   3  Select your jar file and click  Ok   and then you can see on your build gradle like this    compile  files  src your libs your jar

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In Android Stuido  I like use Gradle to manage Gson lib   Add below dependency in your build gradle file   repositories  mavenCentral     dependencies  compile  com google code gson gson 2 2 4     Everything is OK   You can also see this post  The best way to integrate third party library in Android studio

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Like many before pointed out you shall add   compile files  libs gson-2 2 3 jar      to your build gradle file    However I have a project in Android Studio that was migrated from Eclipse and in this case the  libs  folder is named  lib  so for me removing the  s  solved the problem

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Added the libs folder at the level of app    Added all the jars in this project   Next  selected all the jars  in the libs folder  right click on the selected items  and say add library then you will find the jars expansion option  within the project explorer itself    I observed CTRL   ALT   SHIFT   S --  project structure --  app-module -- Dependencies  already had an entry as  dir   libs   include     jar   under compile-option  initially  And after adding the jar s as per the steps stated above  the build gradle got the entries for the new added jar s  itself

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Here are the instructions for adding a local jar file as a library to a module    Create a  libs  folder in the top level of the module directory  the same directory that contains the  src  directory    In the build gradle file add the following so that your dependencies closure has   dependencies              other dependencies     compile files  libs  lt your jar s name here gt       Android Studio should have already setup a gradlew wrapper  From the command line  navigate to the top level of your project  the directory that has a gradlew file    Run   gradlew assemble  This should compile the project with the library  You may need to fix errors in your build gradle file as necessary  In order to have Android Studio recognize the local jar files as libraries for support while coding in the IDE  you need to take a few more steps   4 1  Right click on the module in the left hand panel and choose Open Library Settings     4 2   On the left panel of the dialog  choose Libraries   4 3  Click the   sign above the panel second from the left -  Java    4 4  Select your local jar and add it to the project  You may need to run the above   gradlew command one more time

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menu File - gt  project struct - gt  module select  app  - gt  dependencies tab - gt    button  - gt  File dependency - gt  PATH myfile jar

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In Android Studio 2 1 I follow the this way   Goto app -  src-  main -  assets folder  If not available create it  -  put your JAR files    In your build gradle add dependency like this   implementation files  src main assets jsoup jar   implementation files  src main assets org-apache-xmlrpc jar   implementation files  src main assets org apache commons httpclient jar   implementation files  src main assets ws-commons-util-1 0 2 jar     Sync now   Now your JAR files ready to use

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I found Dependency Manager of Android Studio quite handy and powerful for managing 3rd party dependencies  like gson mentioned here   Providing step by step guide which worked for me  NOTE  These steps are tested for Android Studio 1 6 and onward versions on Windows platform    Step-1  Goto  Build   Edit Libraries and Dependencies     it would open up the dialog  Project Structure     Step-2  Select  app  and then select  Dependencies  tab  Then select  Add   1 Library dependency     Step-3   Choose Library Dependency  dialog would be shown  specify  gson  in search and press the  search button     Step-4  The desired dependency would be shown in search list  select com google code gson gson 2 7  this is the latest version at the time when I wrote the answer   press OK    Press OK on  Project Structure  dialog  Gradle would update your build scripts accordingly     Hope this would help

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Download  amp  Copy Your  jar file in libs folder then adding these line to build gradle   dependencies       implementation fileTree dir   libs   include      jar        implementation  com google code gson gson 2 3 1      Do not forget to click  Sync now

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Put the  jar files in libs folder of the Android project   Then add this line of code in the app s gradle file       compile fileTree dir   libs   include      jar      For Android gradle plugin 3 0 and later  it is better to use this instead       implementation fileTree dir   libs   include      jar

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All these solutions are outdated  It s really easy now in Android Studio   File   New Module     The next screen looks weird  like you are selecting some widget or something but keep it on the first picture and below scroll and find  Import JAR or  AAR Package   Then take Project Structure from File menu Select app from the opened window then select dependencies  then press green plus button  select module dependency then select module you imported then press OK

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You can do this with two options   first simple way   Copy the  jar file to clipboard then add it to libs folder  To see libs folder in the project  choose the project from combobox above the folders   then right click on the  jar file and click add as a library then choose a module then ok   You can see the  jar file in build gradle file within dependencies block    dependencies           implementation fileTree dir   libs   include      jar            implementation  com android support appcompat-v7 21 0 3          implementation project   okhttp-2 0 0           implementation  com google code gson gson 2 3 1            Second way is that  We can add a  jar file to a module by importing this  jar file as a  jar module then add this module to any module we want   import module ---  choose your  jar file --  than import as a  jar --   Then CTRL ALT SHIFT S --  project sturure -- choose the module you want ato add a jar -- Dependencendies --  Module Dependency  build gradle of the module will updated automatically

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compile files     used to work for me  but not any more  after much pain  I found that using this instead works   compile fileTree dir   libs   include     jar    I have no idea why that made a difference  but  at least the damn thing is working now

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My answer is basically gathering some of the right but incomplete answers provided above    Open build gradle Add the following   dependencies   compile  com android support appcompat-v7 19    compile fileTree dir   libs   include      jar    compile  com google code gson gson 2 3      This will allow support for two different ways of adding dependencies  The compile fileTree dir   libs   include      jar     as  Binod mentioned  tells the compiler to look under the folder libs for ANY jar  It is a good practice to create such a folder  libs  which will contain the jar packages that our application needs to use    But this will also allow support for Maven dependency  The compile  com google code gson gson 2 3   as mentioned by  saneryee  it is another recommended way to add dependencies that are in a central remote repository and not in our  libs  local repository   It is basically telling gradle to look for that version of that package and it s telling the compiler to consider it when compiling the project  having it in the classpath   PS  I use both

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Easy steps to add external library in Android Studio         If you are in Android View in project explorer  change it to Project view as below                  Right click the desired module where you would like to add the external library  then select New   Directroy and name it as    libs    Now copy the blah blah jar into the  libs  folder   Right click the blah blah jar  Then select  Add as Library     This will automatically add and entry in build gradle as compile   files  libs blah blah jar   and sync the gradle  And you are done         Please Note   If you are using 3rd party libraries then it is better to use dependencies where Gradle script   automatically downloads the JAR and the dependency JAR when gradle   script run       Ex   compile  com google android gms play-services-ads 9 4 0       Read more about Gradle Dependency Mangement

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With Android Studio 3    You should just be able to simply copy the jar file to the libs folder right under the app folder       myproject app libs myfile jar  Then select Project Files from the drop-down on the Projects window  right click on the project  select Synchronize to see the file in Project Files   It will automatically add the dependencies in the gradle file  Module app    dependencies           implementation files  libs myfile jar     Here is another solution   Go to the Project Files view  select Project Files from the dropdown      Select New    Directory  create a folder named libs right under app     Open up File Explorer  copy and paste your jar file into the libs folder   In Android Studio  right click on the jar file  and select Add as a Library    from the popup menu     You should see the file listed in the dependencies list in the gradle file   dependencies           implementation files  libs myfile jar       Open up your java file  and add the import statement there   import com xxx xxx

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I have read all the answers here and they all seem to cover old versions of Android Studio   With a project created with Android Studio 2 2 3 I just needed to create a libs directory under app and place my jar there  I did that with my file manager  no need to click or edit anything in Android Studio   Why it works  Open Build   Edit Libraries and Dependencies and you will see    include    jar   dir libs

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In android Studio 1 1 0   I solved this question by following steps   1  Put jar file into libs directory   in Finder   2  Open module settings   go to Dependencies  at left-bottom corner there is a plus button  Click plus button then choose  File Dependency   Here you can see you jar file  Select it and it s resolved

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1  Put the jar  in my case  gson-2 2 4 jar  into the libs folder       2  Ensure that compile files  libs gson-2 2 4 jar  is in your build gradle file       3  Now Click on the  Sync Project with Gradle files  Left to AVD manager Button on the topbar     After I did the above three  it started working fine

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I ve been struggling with the same thing for many hours  trying to get the Gson jar to work no less  I finally cracked it     here are the steps I took    Put the Gson jar  in my case  gson-2 2 4 jar  into the libs folder Right click it and hit  Add as library  Ensure that compile files  libs gson-2 2 4 jar   is in your build gradle file  or compile fileTree dir   libs   include     jar   if you are using many jar files    Edit   Use implementation files  libs gson-2 2 4 jar    or implementation fileTree dir   libs   include     jar    in Android Studio 3 0  Do a clean build  you can probably do this fine in Android Studio  but to make sure I navigated in a terminal to the root folder of my app and typed gradlew clean  I m on Mac OS X  the command might be different on your system   After I did the above four  it started working fine  I think the  Add as library  step was the one I d previously missed  and it didn t work until I cleaned it either    Edit - added the build gradle step which is also necessary as others have pointed out

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Download Library file from website Copy from windows explore Paste to lib folder from Project Explorer Ctrl Alt Shift S open Project Structure Select Dependencies Tab  add the file by using   Tool bar Sync project with gradle file by using button   That solved my problem  Try  if anyone want more details let me know

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Unlike Eclipse we don t need to download jar and put it in  libs folder  Gradle handles these things we only need to add Gradle dependencies  Gradle downloads it and puts in gradle cache   We need to add dependencies as   dependencies  implementation  com google code gson gson 2 2 4    thats it However we can also download jar  amp  add that as library but the best practice is to add Gradle dependencies

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Create a folder libs  Add your  jar file  Right click on it and you will find add jar as dependency  Click on it  Its all you need to do  You can find the dependencies added to your build gradle file

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Step 1   Now under your app folder you should see libs  if you don t see it  then create it    Step 2   Drag  amp  Drop the  jar file here  you may be get a prompt  This file does not belong to the project   just click OK Button    Step 3   Now you should see the jar file under libs folder  right click on the jar file and select  Add as library   Click OK for prompt  Create Library   Step 4   Now this jar has been added

[android] Android Studio: Add jar as library?

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