Develop Reference

Importing roottools.jar into Android Studio

I'm trying to import roottools from here: https://code.google.com/p/roottools/ (jar file) to the Android Studio project. So far I've tried the following:
copy RootTools-javadoc-3.4.jar into libs directory under my project.
Add imports
Reorganize imports.
Rebuild project
But still I don't have "acces" to it's methods. Is it possible that is only compatible with Eclipse?

I tried using the JAR available for download and it didn't work either. To get this working, I had to download the project available at github here. Compile and run the task "makeJar" (right click on task makeJar in the gradle.build and select run).
I just added this new jar in the libs and referenced in the gradle.build file.
dependencies {
...
compile files('libs/RootTools.jar')
}
or you can add it via Project Properties.
It worked perfectly (don't forget to sync your the gradle files if you edit it manually).

In your project, choose File menu > Project Structure (there's a bug in 0.4.4 and this menu item won't have a title at all; it still works) > Modules > choose your module > Dependencies > + button > File dependency > choose your library from the file picker. That file needs to be somewhere beneath the root directory of your projet; the libs directory is fine.
Screenshot of the Project Structure dialog:

Android Studio fail add libs Universal Image Loader

Android-Universal-Image-Loader(https://github.com/nostra13/Android-Universal-Image-Loader) is my favorite library.
But it can't add libs when i use Android Studio(use 0.1.5 version).
i know how to add libs in Android Studio
(https://stackoverflow.com/a/16628496/397457)
when i add Android-Universal-Image-Loader libs to Android Studio. Editor error about "can't reslove R". i try this Max OSX(i try too Windows but fail. Windows error message => "Gradle: error: package com.nostra13.universalimageloader.core does not exist". but Editor no error message. only show when i run application)
other libs like Gson no problem. but only Android-Universal-Image-Loader have this problem.
Your Android Studio success add Android-Universal-Image-Loader? if success tell me how to.

I just added the universal-image-loader like this:
Firstly download the universal-image-loader-1.8.5-with-sources.jar.
(For 5/2014. universal-image-loader-1.9.2.jar works great. Don't need the "with-sources" file.)
Then put it on my MyAppProject/MyApp/libs.
Right clicking on universal-image-loader-1.8.5-with-sources.jar i add it as a library with the default configuration.
Finally on MyAppProject/MyApp/build.gradle add the following:
dependencies {
compile files('libs/universal-image-loader-1.8.5-with-sources.jar')
}

From the error "package com.nostra13.universalimageloader.core does not exist", it seems like you have not added the source as the library. Right click the "universal-image-loader-1.8.4.jar" file under the libs folder and from the context menu, click "Add as a library" option.
If after this you are getting the "ClassDefNotFoundException", please follow the following steps:
Add the library to the project.
Edit your Gradle build file and add the dependency for the UIL in it
Close Android Studio
Open command prompt and go to the project's root folder (you will find 'gradlew' file there) and clean your build by issuing the clean command C:\CarApplicationProject> gradlew clean
Restart Android Studio.

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.

There are two ways to use Universal Image Loader
By downloading Jar and add it to lib folder and
compile files('libs/universal-image-loader-1.9.5-with-sources.jar')
Simply add gradle dependency
compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
And here is a quick tutorial link

Why can't I add mopub-android-sdk as library?

I want to use MoPub for putting ads in my Android app.
I have downloaded the required resources and set-up a library project (mopub-android-sdk) in Eclipse. Now I want to add this project as a library to my Android app. But when I try to do that it gives this error:

Are the mopub-android-sdk files in the same parent folder as your project? This seems like the same problem addressed in this question/answer:
In eclipse, unable to reference an android library project in another android project
Place the referencing project in the same physical folder and see if the error persists.

To get around this, don't set up the mopub-sdk as a library project.
You can simply import it as a standard project.
Go to File > Import >Existing Projects Into Workspace, find the right project and click finish.
Right click your actual project and then click Build Path. Go to Link Source and then select the location of the project you just imported.
That should resolve the issue for you without requiring you to build a JAR.
-Franklin

Module dependency not detected during compile in IntelliJ IDEA 11

I am developing an Android app and I'm trying to include GraphView to plot some graphs.
It is required to include it as a module dependency. After I do that, the IntelliJ IDE properly detects the packages and I can import them, but compiler throws errors when trying to compile:
package com.jjoe64.graphview.GraphView does not exist
cannot find symbol class GraphView
etc.
I followed this guide to include it: http://wiki.jetbrains.net/intellij/Sharing_and_re-using_Android_resources_through_library_projects

If it still occures to anyone , for me the reason was that the module's Android class libarary source folder was not marked as 'Sources' directory .
Simply click on the sources folder and choose mark directory as --> source folder.
After that instead of compile , choose 'make' , and then it will start working for you.
Best of luck with that annoying bug !

I had the same problem and this is how I solved it:
I was using Gradle so I right-clicked on the build.gradle.kts (it may just be build.gradle in your case) and clicked on "Import Gradle project" and everything worked again!

Why can't android find com.google.gson.Gson

I'm trying to use GSON in my project, but my application is crashing, with logcat saying that com.google.gson.Gson cannot be found. I've put import com.google.gson.Gson on my class files, I have gson in my package explorer, and added it by Right click -> build path -> add libraries. It also shows up in Project->properties->java build path->libraries tab->gson. What have I done wrong?

What worked for me: Check the checkbox next to the lib (gson-2.0.jar) in: 'Project Properties' -> 'Java Build Path' -> 'Order and Export' tab. Then do a clean/build.
This adds the exported=true attribute to the classpath entry
<classpathentry exported="true" kind="lib" path="libs/gson-2.0.jar"/>

Have you put the jar file in the libs folder of the project? If not , try moving it there, creating the folder if required. Should be at the same level as the src folder.
I had a similar issue trying to get an app built and that solved it.

I'm using IntelliJ, not eclipse but here is how I did it:
Download the source files from https://google-gson.googlecode.com/files/google-gson-2.2.4-release.zip
Unpack them
Copy them into the "libs" folder of your project. I did this manually by using the terminal but you can do it by going in your project folder located in your computer. Your Project_Name >app >Libs [paste them here]
Go to your editor (IntelliJ in my case) You should see the the following 3 files in the libs folder of the project structure:
gson-2.2.4.jar
gson-2.2.4-javadoc.jar
gson-2.2.4-sources.jar
Open your build.gradle file and insert the following line in the dependencies section:
compile files('libs/gson-2.2.4.jar', 'libs/gson-2.2.4-javadoc.jar', 'libs/gson-2.2.4-javadoc.jar')
Right click on each of the source files and select "Add as Library..."
Use the following options:
Name: name of the jar file
Level: Project Library
Add to Module: select project your adding to
Rebuild project
Build > Rebuild project
Import and use it!
import com.google.gson.Gson;

I have observed today that it doesn't like when you add your library.
The solution that worked for me was to add it as an external jar only. I have observed it by doing the steps described by author of this post i.e. Properties -> Java Build Path -> Libraries -> Add External JARs and point to the downloaded gson library.

I ran into the same issue (when installed SDK 17) ...
The solution is, that you just put the pure jar files into the "libs" folder (without subfolders).
You also don't need to declare them, android wil find them itself. You may need to do a Project > Clean

I had similar problem, but I guess my requirement was more complicated as the GSON libarary was used by an Android Library Project that my main Android project depended on. I have tried both approaches above but none of them worked for me. If I add the GSON jar file directly to the main Android project it works, but that is not what I wanted.
With a bit of investigation I have realised that the GSON jar does not use any dependencies (third party libraries) itself. So my solution was to copy the source file of the GSON project to my Android Library project's src filder and it worked like a charm. so you can use the Source code rather then the binary code. The source code is part of the download in a jar file, just unzip it.

i'm sure you have copied the jar into "libs",
and also added property> Java Build Path >(tab) Libraries, right?
my issue was stupid...
please check other than Gson jar, if you have two stuffs at least in above tab:
android x.x
Android Dependencies (especially this one, i missed this, eclipse show me an error of "could not find class com.google.gson.xx" )
simply do a project copy will solve this problem...

Do not edit .classpath file directly or even put files into lib folders out of Eclipse.
Instead use the Java Build Path->Order and Export tab to select libraries to be exported in the final deployment unit (eg war/apk)
To be on safer side, do a Project->Clean after you change the build path.

I faced the same thing.But the solution was quite easy,just Right-Click on your project->Properies->Libraries->Add external jars->OK and thats it.It solved my problem.hope it will solve yours as well

If Projct Properties -> Java build path -> Add external jars doesn't work and your project is a web project, try adding the gson jar directly to the server lib folder. Example: for apache Tomcat to apache-tomcat/lib.

I have been trying the same thing and read so many answers and tried so many things but to not vial, but i solved this problem by doing just one click and its simple.
1) Add your .jar file in libs folder make sure its libs not lib
2) Clean and Build your project you will see that file under libs folder
3) right click the file and go to build path and select add to build path
Run your project it will work fine. Hope this helps

I am using Android Studio
I had the same problem I had solve it by
select project press f4 from popup
click app and in dependencies
select file dependency and select the three folders which I had pasted in lib directory