Develop Reference

Errors running builder 'Android Resource Manager' on ADT

I am facing a problem when I try to create new android project in eclipse adt plugin tools.
ERROR/EXCEPTION::
Errors occurred during the build.
Errors running builder 'Android Resource Manager' on project 'test'.
java.lang.NullPointerException
I have faced this problem two times previously. Only solution was to re-install Windows operating system which actually did solve the problem. But I want a real solution without re-installing Windows.

Switching to a new workspace worked for me.
File-> Switch Workspace.

found a better solution. in the create project wizard. don't create an activity in the wizard. just untick create an activity and just create the activity manually in the manifest.

I guess you upgrade your java to java7u55.
because I am using mac, but, FYI
I solve this by edit eclipse.ini, force the ide to use java 1.6
-vm
/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Commands/java
you could try the same.

In my case, the error was solved by changing the workspace folder permissions with chmod 777.
I am using Mac OS X and downloaded the ADT bundle for Mac.

If you close eclipse and then look in your system processes and still see adb running, then that's the problem - it crashed. In my case it was because I have extension files for other programs in my JRE that the adb doesn't seem to like. Remove all your ext files, force shut down your adb.exe and then restart eclipse.
Root exception:
java.lang.NoClassDefFoundError: org/apache/log4j/Priority

Usually this means that they have one more time introduced a bug.
The "magic passes" that may help or not help are:
Pressing F5 (refresh)
Updating Android, Eclipse and ADT (knowing that you do have such a problem, I myself definitely will not do any such updates in the near future)
Creating a project from the command line, building it and trying to import
If you have any project that already works, you may try to take files from that project.
Read the logs, they are usually more informative than just the last 30 lines, but on Windows you will have to either configure the screen buffer height to be about 300-600, or redirect the output to a file.
Clean and build again.

You usually get this after an SDK/ADT update.
Go to your SDK manager and ensure that there are no updates. Then in Eclipse go to Help > Check for Updates and install any updates it finds.
Restart eclipse and hopefully it should all work.
Failing that uninstall Eclipse and re-install Eclipse and the plugins again should fix it as well, no need to re-install your whole PC.

I use maven to build and integrate android projects with jenkins/netbeans. For editing android resources, I often use Eclipse because of the ADT plugin and better android resources support.
Eclipse (Kepler) has serious problems when you import maven-based android projects. It expects the project.properties file in the root folder and will NOT generate it on its own no matter what. Example content:
# this file is needed by eclipse (adt plugin).
# Project target.
target=Google Inc.:Google APIs x86:19
Additionally, create a sym link called "gen" pointing to target/generated-sources/r if using maven to build the android project on the command line. That way, you should be able to do "File->Import...->Existing Android Project". You get an error message, but it didn't matter in my case.
Additional hints in case you have problems with m2e-android plugin:
always check that the output folders for source dirs and resource dirs are correct.
check that source dirs are set as source dirs (you usually get a corresponding warning)
if resources from dependencies are not included in the final apk, check the filter settings for your resource dirs
you may need to "import maven project from existing sources" before importing it as android project from existing sources.
make sure dependencies are imported into the workspace and open and referenced (project props -> android -> add lib)
eclipse adt does not support aar libs, use apklib instead

It can happen if you are changing the location of files that your
eclipse project uses.
In that case you can copy the files directly to your resources folder inside the workspace instead of linking them with "import"

These simple steps put me out of this trouble -
In Eclipse, Help menu -> Check for Updates.
Select all Android related plugins.
Click Next, Accept the agreement page then proceed to install the
plugin.

Make sure your java path points to the java SDK bin directory.. make sure you have installed the latest JDK t be safe..

You can also try one of these:
Close and open the project in Eclipse
Click right on the project and choose: Android Tools -> Fix Project Properties

I beat my head against a wall for a day because of the same problem. My solution (OS X): I had a stale "java_home" definition in my profile pointing to a dead symlink, as well as old classes in /Library/Java/Extensions. I removed the definition and symlink, along with two classes in Extensions (ActiveMQ and Geronimo, FWIW) and the problem went away. Not sure which step was the actual "rectifier" but if any of those conditions apply, you might want to check them.

I faced same problem on my New Macbook Pro so I just Downloaded JDK and installed it and problem fixed.

I was experiencing the same issue - I refreshed and updated Eclipse and Android plugins and was still seeing the NPE. What worked for me was changing the order of operations.
In order:
1. update Eclipse & Android plugins
2. after the update has completed, perform the F5 Refresh in the current workspace

Make a copy of your project in Explorer/Finder. Delete the project in ADT/Eclipse. Import the project again using Eclipse. Project/Clean then build. This works for me.

I have tried every solution I found on the web and they did not work.Then I remember java version on my Mac was 1.7 and I have installed subversion version 1.6 and the problem occured after that installation.Also I have deleted eclipse and used a clean eclipse and Android sdk installation I still got the problem, then I uninstalled the JDK 7 as it is told in here http://docs.oracle.com/javase/7/docs/webnotes/install/mac/mac-jdk.html and my problem is solved.

I have several projects in my folder. Every time I start a new one I close the others. I got this error because appcompat_v7 was closed.
Right click on appcompat_v7 and select Open Project.
This solved my problem.

Solved after changing a setting in eclipse.ini. I am using OS X 10.11.4 and Eclipse Mars 4.5.2.
Go to the folder of Eclipse.app in Finder.
Right click to open a menu, and click Show Package Contents.
Go to /Contents/Eclipse.
Open eclipse.ini in your favorite text editor.
change -vm path like below:
BEFORE: /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home/jre/bin
AFTER: /Library/Java/JavaVirtualMachines/jdk1.8.0_73.jdk/Contents/Home/jre/bin
reopen Eclipse.
enjoy :D

Importing libgdx project into Eclipse Juno error Cannot find .apk

I am just starting to learn Libgdx, and am in the process of importing the 4 projects[desktop, main java game, android, html] into Eclipse Juno. I have not added any lines of code, just trying to get them to run on the different platforms.
It runs fine on the desktop version, but when I tried to run it in the Android emulator I get the error. Cannot find mygdxgame.apk!
I realized that my gen folder is completely empty, there is no R.java for the project. I have tried a number of things to make this work, but none of it is working. I am listing the things I have tried so far, and the hopefully the reason why I am asking this repeatedly asked question.
Project > Clean
Package Explorer [right click on my project] > Android Tools > Fix Project Issues
Deleted gen folder and Project > Clean
Restarted Eclipse
Deleted the project and Imported it again
Set Compiler Compliance Level to 1.6 for both main java game and Android project
Added a dummy XML to the android project and tried clean, and deleted it
Unchecked and rechecked Build Automatically
Checked my target-sdk in project.properties and made sure it is the same Project Properties -> Android and in my Manifest.xml
[Right click on project] > Properties > Java Build Path > Source tab, Removed mygdxgame/gen folder and then added it again
Made sure Project Properties > Android > Is Library is unchecked
Nothing has worked so far. My gen folder is still empty and I am unable to run the Android project because of the same error. Cannot find mygdxgame.apk!
What else can I do to fix this? In case this is answered I would appreciate someone giving me a link to the solution, as I have been pouring through SO and Google in general for nearly 2 hours now, with no success.
Regs

What happened to me a few days ago:
1.- I got the SDK Tools 22 update and I installed it, no other update appeared in my sdk manager... so I closed it.
2.- Then I got that "NO APK" error and tried every answer I could find.
3.- I opened SDK manager again, and I noted SDK Platform Tools also got an update and there was a new one: SDK Build Tools. Both of them didn't show up when I first updated the SDK Tools.. so.
ANSWER:
Open SDK Manager and check if your SDK Tools, SDK Platform Tools, SDK Build Tools are updated :)

On your build path, you should have a reference to the main project, under Projects tab of Java Build Path. Under Libraries, you should have gdx-backend-android.jar and gdx.jar along with Android not being a library.
Please check if Android is set as a library. If so, uncheck it. To do that, right click on the project and then select Properties. Choose Android on the left panel of the new window. Uncheck Is Library if checked.
Here's something might help-
Unable to run Android app, Could not find .apk issue in eclipse

I would take alook at your buildpath if all libs are correct. If it's a projekt from an other computer the libs are often at different places so you need to correct those manual. If they are not correct the android projekt do not generate your R. class and so on. So do rightclick on the core projekt -> Buidl Path -> Configure Build Path. Now take a look at the libs if all are there. I had the same issue with the android 15 apk so i need to add it manual. The clean or such do not fix such because eclipse can't know where you have all your libs.
If you really dont get it run i would recoment to use the setup ui of libgdx. It does noramlly handle all imports and so on for you. You can also use it to update your current projekt and so on.
Else i would read the guide for Manual Project Setup of Libgdx.
Libgdx setup Guide
I hope this does fix it.

unable to get system library for the project on eclipse ide

I was working on an android tutorial and it wanted me to import the library from another project .The import worked and the project works correctly. But I noticed that doing that messed up several of my other projects (the ones that use Android 2.1) by apparently messing with the build path. Now instead of seeing "Google APIs [Android 2.1]" under the gen folder I see "Unable to get system library for project".
I verified the following:
I right-clicked the project and went to Properties I see that the correct Project Build Target is checked(Google APIs [Android 2.1]), but "Unable to get system library for project" is still shown above the assets folder and below gen and Android Dependencies. Cleaning all projects doesn't help.
How can I fix this problem?
is there a way to fix this issue globally or do I have to do it one by one?

I had the same problem. Try
Right click on your project
Go to properties
Click the Android section
Select a different target api (assuming one is already selected, as mine was - otherwise, select the one you want and jump to step 9)
Click OK
Do steps 1-3 again
Select your original target api
Click OK
Clean and build your project
Worked for me, anyway.
Derived the solution from:
"Unable to get system library for project" after I upgraded to Android SDK 2.3 and ADT 8.0

Error in .classpath on your project. It not connect to android sdk. Fix it and clean project. :-)

This happens when you are targetting an API version that for some reason is not mapped on your buildpath.
See which is the version of the SDK you are pointing to at the project.properties file.
Go to the SDK Manager at Window->Android SDK Manager
Check the Android API item that matches the version you want to use, OR, click on the latest one and then update your project.properties file.
Make sure your project build configuration is Project->"Build Automatically"
Retsart Eclipse (claning and rebuilding may not refresh all the project properties)

Borrowing from #Erhannis answer :
"
Right click on your project
Go to properties
Click the Android section
"
When I view the build target everything looked fine :
So I checked another build target , hit apply, and then re checked my original build target (Android 4.4.2) and re-hit apply. My project then compiled.

For me the project.properties file was missing (it was code from a repo I checked out). So I just created one with this line:
target=android-20
After that, Erhannis' solution worked for me.

Just for completing Erhannis answer: If you fixed the problem but it appears again when you restart Eclipse, then just go to the file local.properties on your workspace folder and verify that the location of the Android SDK there is correct.

At times, when only single Android SDK version is installed on your system, and if it gets changed either by un-installing / re-installing Eclipse, or otherwise (directly through SDK Manager), then this issue might crop up.
.
This is accompanied by the message like this on Eclipse console:
YourApp] Unable to resolve target 'android-22'
.
A simple workaround to this issue is:
Open AndroidManifests.xml of the project, and in the:
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="21" />
change the targetSdkVersion to the one currently installed on your system
Next, open the project.properties file and update
target=android-21
to your current SDK version
Finally, clean and re-build the project

Right Click on Project-> Select Android tools -> Select Fix Project Properties
This did the trick for me.

You need to click on the menu icon with the Android sitting in the grey box with a white arrow pointing down "Opens the Android SDK Manager".
or, from the command line, run:
%ANDROID_HOME%\tools\android sdk

Android showing "Unable to get system library for project"

I was working on an android tutorial and it wanted me to import the library from another project. All well and good. The import worked and the project works correctly. But I noticed that doing that messed up several of my other projects (the ones that use Android 2.2) by apparently messing with the build path. Now instead of seeing "Google APIs [Android 2.2]" under the gen folder I see "Unable to get system library for project". When I right-click the project and go to Properties I see that the correct Project Build Target is checked(Google APIs [Android 2.2]), but "Unable to get system library for project" is still shown above the assets folder and below gen and Android Dependencies. Cleaning all projects doesn't help. How can I fix this problem, and is there a way to fix this issue globally or do I have to do it one by one?

In the project root folder you should have file named project.properties
---- file content -----
target=android-16 ## <--- make sure that it is there and that you have proper sdk installed

For me, the problem was that in the Project settings - Android tab, I had no Android version selected.

For me I had SDK version 8 selcted, but if I selected the next highest version, applied, then selected version 8 again and apply, fixed the problem.

For me, what worked was to restart Eclipse. Hope this helps.

The project was not built since its build path is incomplete

Every time I try to import a project downloaded from googlecode into Eclipse but I get some errors:
The project was not built since its build path is incomplete. Cannot
find the class file for java.lang.Object. Fix the build path then try
building this project
Unable to resolve target 'android-10' (this changes from 1 to 15)
I've already checked the other answers on the site but no solution worked.
In
Properties -> Java Build Path -> Libraries
there's 1 item:
Unable to get system libraries for the project

Right click on project -> Properties -> Java Build Path (From Left List) -> Libraries (Tab) -> Add Library (Button on right) -> JRE System Library -> Next -> Workspace default JRE -> Finish
This should solve at least one of your errors. Any others might require you to add further libraries.

Close eclipse and re-open worked for me. You may have to do this two or three times. Each time give it a minute for the auto build startup process (check bottom right hand corner) to complete, as these errors often disappear at this time.
Or try to clean the affected projects.
'Turn it off and on again'

It seems that you lack JDK (java.lang.Object comes from there )
The problem is that you used the same Android API on different PC. Eclipse is lost with path names that are differents but with same API.
To solve it, first re-select Android API version (set to another one and valid, then restore the on you want and validate it -> it will force Eclipse to reload API).
Then go into project->properties-> java build path. Then remove "Unable to get system library for the project" then "Add library" and select "Android Classpath container".

Initially I was trying to import an android project from github and encountered the above problem
cannot configure build path
unable to get system libraries
Package Explorer -> Right click the project -> “Properties” ->
"Android" -> "Project Build Target" = 2.3.3
Note: Also try Clean (On Windows: Project -> Clean) then Refresh (F5) at random. There's a good chance this will magically solve all your problems.
courtesy: KYLE CLEGG
reference link

None of this worked for me. I created a new workspace for the projects. That worked for me! Switching to a new workspace usually miraculously solves a lot of these configuration problems. Simply create a new folder where you would want your new workspace to be and then use 'import project from existing code'.

Goto eclipse → Preferences → Java → Build path.
Do you see a JRE_LIB configured there? If not, add JRE_LIB from JDK/jre lib location. These can be overridden per project. It seems your eclipse isn't aware of Java libraries.

I have seen such errors in past while importing projects in eclipse. The solution to that is to go to properties->Android and select project build target appropriately (Android x.x.x or Google APIs)

Was struggling with this while trying to load the Vuforia Sample App for way too long today. The solution that finally got my project to build was:
1) Window->Android SDK Manager and Install the latest updates
2) Project->Build Path->Configure Build Path->Android and under Project Build Target mark Android 4.4.2 and click OK
3) Clean, Build and Run
I hope this solves somebody else's issue as well, Eclipse is frustrating as F$##!!!

I encountered with the similar problem.....
Make sure that
You create your project within your workspace. If your project is not in the default workspace where .metadata folder within which other plugin folders, and etc. will be present, then it will ask you to configure build path as the project is not build because of incomplete build path.
If the first step is clear, then go for this.....
Right click on your project -> build path -> configure build path -> libraries -> Add libraries -> JRE system libraries -> Apply and close.

I've had similar problem. Exact same error, but in Ubuntu after I worked on project in dropbox folder from Windows.
I've just added android.jar to project. Somehow it disappeared from build path.

For me this problem was related to OpenJDK 6 on Ubuntu.
Update your JRE or install Sun's proprietary JRE instead and restart Eclipse.

I know this is too late. but I am also facing this issue and I fix this by following below steps.
This issue is occurred only if the project shared between different machines.
For me I found java JDK is the problem.
My colleague used mac system and using jdk 1.7. but in my system I used jdk 1.6.
I guess that may be the issue. So I select project and open properties and change my jdk to 1.7
Change target=Google Inc.:Google APIs:19
Clean & Build
Finally issue is fixed. I think this is because of If you build your project with higher JDK version thereafter you should build with same version.
NOTE : we are not facing this issue before until my colleague build with JDK 1.7. After he started to using JDK 1.7 only this issue occur.
Hope it will work for some one. And no need for install new eclipse.

I had my "Build Automatically" turned off in "Project". I turned it off, because the Eclipse was not loading the projects correctly, for various unknown reasons. Turning this on, solved my problem.

if the project is not very big, you can copy the packages and paste it into a new project, you won't see the errors in the new project.

I was having target-18 in my project.properties. But I wasn't having android-18 sdk. So I changed 18 to some other version which I had in my SDK manager, and it fixed the issue.

You just exit eclipse once or twice to reload. It works for me.

Steve's answer does help for some projects, but still, for some projects, it remains the same. I guess that projects were previously build-in early JDK 1.5 (in my case). But I found a workaround for them:
Find the class that causes the problem (Keep expanding the project in the Package Explorer).
Copy the class's contents after the import block.
Delete the whole class.
Right Click on the project then Android Tools >> Fix Project Properties
Create a class with the same name under the same package the deleted class was before. (If the project is imported and the deleted class was an Activity/Service/Provider/Reciever, I guess the class is already included in the AndroidManifest.xml).
Paste the content of the class and import packages.
Clean the project.

I had to delete R.java in the gen folder, then do a clean build. This solved my issue.