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Asked: 2026-05-31T20:32:42+00:00

I have updated my android-sdk-package from r16 to r17. I have updated the Eclipse

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I have updated my android-sdk-package from r16 to r17. I have updated the Eclipse ADT-Plugin too.
My project worked perfectly fine with r16 (android-sdk r16 and Eclipse ADT Plugin v16), but now the app does not start:
The Classloader can not find the MainActivity. The MainActivity is the first activity, that starts (it is properly declared in the AndroidManifest).

03-22 15:07:28.984: E/AndroidRuntime(22106): Caused by: java.lang.ClassNotFoundException: my.....MainActivity
03-22 15:07:28.984: E/AndroidRuntime(22106):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
03-22 15:07:28.984: E/AndroidRuntime(22106):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
03-22 15:07:28.984: E/AndroidRuntime(22106):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
03-22 15:07:28.984: E/AndroidRuntime(22106):    at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
03-22 15:07:28.984: E/AndroidRuntime(22106):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)

The package name is 100% right. I even checked out a tagged version of my project (I have release the project and I always tag my versions) and tryed it: same result.
What I have already tried (I use Arch Linux):
– delete android-sdk + android-sdk-platform-tools (and reinstall them)
– delete the entire android-folder (/opt/android-sdk) and reinstall the packages, download the target platform
– delete ~/.android
– delete ~/.eclipse
– reinstall Eclipse ADT-Plugin
– recreate Virtual Devices
– create a new project (the new project works)
– unpack the .apk-file and view the compiled classes with dexdump: the apk-file contains the MainActivity
– I read the Android-SDK-Release-Notes for something related, but I didn’t find anything
– And of course, rebuild the project (clean + build, I even manually deleted the bin-folder)

The only thing that really worked was to switch on my notebook (still android-sdk r16).
So… what am I doing wrong? It’s probably something simple…

Thanks!

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1 Answer

  1. Editorial Team

    As has been reported here and elsewhere, you need to ensure that any third-party JARs you are using live in libs/, both in your project and in any dependent library projects. Try that and see if it helps.

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