Develop Reference

Problems including library project into build path

I am trying to follow the steps of setting up a v7 support library as they are listed on the android development website.
Create a library project and ensure the required JAR files are included in the project's build path
I get stuck on step 5 where I am supposed to right click the JAR files and choose "Build Path". This option is missing. I have checked other questions related to this such as this one>>> Question
but none of the listed solutions seem to work for me. Either that or I do not see the options that the posters are referring to on the menus. Has anyone had this problem? Where did I go wrong?
I need this for an android project.

If you are doing in eclipse, then you can go to ProjectName -> Right click on it -> Goto Properties -> Goto Java Build Path -> Go to Library -> Choose Add Jars option if jar is in same project or choose Add External JARs if jar is outside the project folder.
If you have already copied the JAR file to libs/ directory of your project then choose the option of Add JARs and browse to the libs folder where you've copied the jar. Select it and press okay. It should get included in your project. Hope this helps else please comment.

ActionbarSherlock not working

I am having problems getting start with the ActionBarSherlock. I downloaded the 4.1.0 version and followed the following tutorial for installing it.
http://www.youtube.com/watch?v=4GJ6yY1lNNY
The Problem I am facing is whenever I make a new project and add the library project of ActionbarSherlock to it. I get the following error.
Description Resource Path Location Type
The container 'Android Dependencies' references non existing library 'C:\Work\JakeWharton-ActionBarSherlock-4.1.0-0-g9598f2b\JakeWharton-ActionBarSherlock-88fc341\library\bin\com_actionbarsherlock.jar' myapp Build path Build Path Problem
Please anybody help me with it.

I just had the same problem: A .jar file is requested, but non-existing. Also, it is okay that the file doesn't exist, because we want to use a Android-Library Project and not an included jar-library.
The steps described by Aqif Hamid are perfectly fine, if the missing import (.jar or library project) would be the root of the problem. But i figured out that the reason for this error is that you have to set both projects (AndroidBar Sherlock and your own Android project) to Java Compliance Level 1.6
To do so go into Project Properties => Java Compiler and set the level to 1.6
Of course, you have to install JDK 1.6 on your computer...
Hope this helps you too!

The only thing that it works for me was selecting at Properties at Java Compiler Tab Compilance Level --> 1.7 (It was 1.6).
After that Android Tools, Fix Project Properties

DO the followings:
just like you have bin, res folders. right click on your project and
add a folder named 'libs' (if libs folder is not already there).
Then copy paste your com_actionbarsherlock.jar file in this libs folder.
Right-click on your com_actionbarsherlock.jar file and click Add to Build Path.
Now clean and build your project. You should be good to go.
Edit:
To add project as a library do this:
Make sure you have your library project in your projects list and it
is open.
Right click on your project in which you want to add your library
project and select Porperties.
Click Android in properties windows, now scroll down, you will see
library section at the bottom. There press Add button.
Now a window will open in which you will see list of library
porjects. Select your required project and press Ok. Now that library
project must be there with a green tick mark.
Press Apply and Ok button.
You should be good to go now.
regards,
Aqif Hamid

I am of the understanding that you cannot include ActionBarSherlock into your project by adding a jar to your lib directory (or just including the jar at all). You will have to create an android project for ActionBarSherlock then link to it as a library:
Create ActionBarSherlock project in Eclipse
Right-click your project and go to Properties
Select Android in the left pane
Then in the right pane, towards the bottom you can Add... the ActionBarSherlock project you created in step 1.
If you are curious why the jar approach doesn't work, I give you Jake's reply in this thread
(although that's a month and a half old at this point).

1 - create a libs folder (parallel to manifest) and put the jar in that
Your Project -> right click -> Properties -> Java Build Path -> Libraries -> Add Jar ->
yourjar.jar
This video might be useful in case you are having some issues.
http://mobile.tutsplus.com/tutorials/android/jar-for-android/

Clean your actionbarsherlock project. It will generate the .jar file for you when it re-builds.

Using the Android Tools option to Add compatible libraries fixed the problem for me.

How can i add "Add External Jar" to my project in android

I want to add banner to my project. I have done some work in this regard, but i have problem in adding "Add External jar".
[Right click on my Project -> properties -> Java Build Path -> Libraries -> Add External jar].
Now my problem is, as I click "Add External jar" a new widow(browsing) opens and asking for to open jar file, but I have studied "Android Developer documents" for adding banner in project, there was nothing mentioned about the to open jar file. Now what I have to do, to add "Add External jar" and I could continue my project further.
Yours help would be greatly appreciated.
Thank`s in advance.

How can i add “Add External Jar” to my project in android
For, this i always follow below steps -
Just create a libs folder on my project ->And, copy the .jar file to there.
In your workspace select your project and right click -> on Properties, just go to Java Build Path
Click the Add External jars it'll open the window dialog box -> root your workspace -> And, select your project -> go to libs folder -> choose the .jar file -> Click ok.
Hope these steps helps you.

There should be a jar file that you downloaded that contains he libraries you need. You'll need to select that jarfile for the step that you are doing currently.
It is a good idea to keep that file within your project folder as well. Many people like to keep all of their libraries inside of a folder called libs within their project folder.

I'm not sure what "banner" is, but if it's an Android Project it cannot be added as a JAR. Projects that have resources are not able to be fully externally liked libs.
If indeed this is Android Project you will need to import the existing project into your Eclipse workspace here the steps http://developer.android.com/guide/developing/projects/projects-eclipse.html#SettingUpLibraryProject

Create a folder called "libs" in your project.
Go to that folder using Windows Explorer and copy the .jar file there.
Refresh your project in eclipse and right click on the jar file and select "Add to Build Path" option.

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

How to use and package a JAR file with my Android app?

I have an API in the form of a JAR that I would like to use in my Android app. Not sure if it should be part of the project in Eclipse or kept separate and added to the project properties. This JAR also needs to be packaged with the application, so how is that done for Android apps?

As explained by this SO question:
Your Project -> right click -> Import -> Archive File -> yourjar.jar
Your Project -> right click -> Properties -> Java Build Path -> Libraries -> Add Jar -> yourjar.jar
You must add it as "external JAR" files, and set the "Order and Export" in your Eclipse project.
Update February 2012:
Pacerier mentions in the comment having an issue (ClassNotFound) even though he did declare the library.
He had:
However, the solution was simple:
Over 1 hour wasted. Man was I pissed!
Solution: make sure your JAR is compiled with 1.6 and not 1.7.
Argh

Thanks to VonC for pointing me in the right direction. I had the same symptoms but for a different library (I needed to add org.apache.commons.codec.binary.Base64 for an Android project). The solution that worked for me was SLIGHTLY different. Herewith the steps that I followed:
Download library from http://commons.apache.org/codec/download_codec.cgi
Extract commons-codec-1.6.jar from the tarball and copy to a local
folder
In eclipse:
right-click project name
choose "Properties" from context menu
on "Libraries" tab, select "Add External JARs..."
navigate to and select commons-codec-1.6.jar from the location you extracted it to your local drive
The jar file will now appear under "referenced Libraries" in your Package Explorer and you will be able to reference the library in your code.