Android Studio - Importing external Library Jar

Question

I recently downloaded Android Studio to develop Android applications  I m coming from Eclipse   and I am having issues using external libraries and or external JAR files alongside my own project  NOTE  the following tests were conducted on a new application project created from scratch in Android Studio   Example 1  JAR Import    Download a fresh copy of the Admobs SDK from Google  Copy the library jar GoogleAdMobAdsSdk-6 4 1 jar to the project s  libs  folder  In the project explorer  right click on the newly added library jar and click on  Add as Library     Technically at this point everything works  imports work just fine  the layout editor shows a preview of the AdView widget and all that  The only problem is that it doesn t compile successfully   Log from console   Gradle   FAILURE  Build failed with an exception     What went wrong  Execution failed for task   APITests compilePaidDebug    gt  Compilation failed  see the compiler error output for details     Try  Run with --stacktrace option to get the stack trace  Run with --info or --debug option to get more log output   Could not execute build using Gradle distribution  http   services gradle org distributions gradle-1 6-bin zip     I tried running gradlew compileDebug --stacktrace  and the problem seems to be that the despite being able to import the classes successfully in both the code  amp  design editor  at compile time  it cannot resolve the imports  Here s the relevant part of the log   full stacktrace here   java 6  error  package com google ads does not exist import com google ads AdRequest      java 7  error  package com google ads does not exist import com google ads AdView  java 11  error  cannot find symbol AdView mAdView  symbol    class AdView location  class MainActivity java 22  error  cannot find symbol mAdView    AdView this findViewById R id adView   symbol    class AdView location  class MainActivity java 23  error  cannot find symbol mAdView loadAd new AdRequest     symbol    class AdRequest location  class MainActivity 5 errors  Test compileDebug FAILED   But again  the imports work well in the editor  and the dependency is there     It s also worth noting that without attempting to add a library JAR  the projects compiles just fine   I then tried editing the build gradle file to include the new lib like this   dependencies   compile files  libs android-support-v4 jar    libs GoogleAdMobAdsSdk-6 4 1 jar       This time  it did compile successfully  but the app now forces closes  as apparently  it cannot find a specific class from the lib in the application package   Caused by  java lang ClassNotFoundException  Didn t find class  com google ads AdView  on path   data app com foo test-1 apk   Any ideas

User · Answer

Here is how I got it going specifically for the admob sdk jar file:

Drag your jar file into the libs folder.
Right click on the jar file and select Add Library now the jar file is a library lets add it to the compile path
Open the build.gradle file (note there are two build.gradle files at least, don't use the root one use the one in your project scope).

Find the dependencies section (for me i was trying to the admob -GoogleAdMobAdsSdk jar file) e.g.

dependencies {
   compile files('libs/android-support-v4.jar','libs/GoogleAdMobAdsSdk-6.3.1.jar')
}

Last go into settings.gradle and ensure it looks something like this:

include ':yourproject', ':yourproject:libs:GoogleAdMobAdsSdk-6.3.1'

Finally, Go to Build -> Rebuild Project

User · Answer

I m using Android Studio 0 5 2  So if your version is lower than mine my answer may not work for you   3 ways to add a new Jar to your project    Menu under Files-- Project Structure  Just press  F4  under Project navigation  right clink on any java library and a context menu will show then click on  Open Library Settings    A Project Structure window will popup   On the left column click on  Libraries  then look at the right pane where there is a plus sign     and click on it then enter the path to your new library   Make sure the new library is under the  project libs   folder otherwise you may get a broken link when you save your project source code

User · Answer

Check the libs version requirements  The lib might be trying to call a method from from a higher Android version  Try adding the apps compatability libs   When all else fails try switching from a Gradle build to an Eclipse build    Delete and restructure your folders to the eclipse style and delete everything but your code  Then reload the project with your libs   Once it runs go back to Gradle  if you wish

User · Answer

You don t need to close the project and go to command line to invoke grade clean  Go to Build-  Rebuild Project

User · Answer

In Android Studio  mine is 2 3 1  go to File - Project Structure

User · Answer

I had the problem not able to load jar file in libs folder in Android Studio  If you have added JAR file in libs folder  then just open build gradle file and save it without editing anything else  If you have added this line  compile fileTree dir   libs   include      jar     save it and clean the project    In next build time Android Studio will load the JAR file   Hope this helps

User · Answer

simple solution is here   1  Create a folder named libs under the app directory for that matter any directory within the project    2  Copy Paste your Library to libs folder   3 You simply copy the JAR to your libs  directory and then from inside Android Studio  right click the Jar that shows up under libs   gt  Add As Library     Peace

User · Answer

Easy way and it works for me  Using Android Studio 0 8 2    Drag jar file under libs  Press  Sync Project with Gradle Files  button

User · Answer

I am currently using Android Studio 1 4   For importing and adding libraries  I used the following flow -   1  Press   Alt Ctr Shift S   or Go to   File -- gt  Project   Structure to open up the Project Structure Dialog Box   2  Click on   Modules   to which you want to link the JAR to and Go to the Dependency Tab   3  Click on         Button to pop up Choose Library Dependency   4  Search Select the dependency and rebuild the project    I used the above approach to import support v4 and v13 libraries   I hope this is helpful and clears up the flow

User · Answer

I use android studio 0 8 6 and for importing external library in project   paste that library in libs folder and inside build gradle write path of that library inside dependencies like this compile files  libs google-play-services jar

User · Answer

you export the project from Eclipse and then import the project from Android Studio  this should solve your problem  open a eclipse project without importing it from Android Studio you can cause problems  look at   Excuse my language  I speak Spanish   http   developer android com intl es sdk installing migrate html

User · Answer

So    Steps to follow in order to import a JAR sucesfully to your project using Android Studio 0 1 1     Download the library jar file and copy it to your  libs  folder inside your application project   Open the build gradle file and edit your dependencies to include the new  jar file     compile files  libs android-support-v4 jar    libs GoogleAdMobAdsSdk-6 4 1 jar     File -  Close Project Open a command prompt on your project s root location  i e  C  Users Username AndroidStudioProjects MyApplicationProject   On the command prompt  type gradlew clean  wait till it s done   Reopen your application project in Android Studio   Test run your application and it should work succesfully

[android] Android Studio - Importing external Library/Jar

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