Android-SDK r17 ruins working projects
<p>I have updated my android-sdk-package from r16 to r17. I have updated the Eclipse ADT-Plugin too.<br>
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).</p>

<pre>
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) 
</pre>

<p>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.<br>
What I have already tried (I use Arch Linux):<br>
- delete android-sdk + android-sdk-platform-tools (and reinstall them)<br>
- delete the entire android-folder (/opt/android-sdk)  and reinstall the packages, download the target platform<br>
- delete ~/.android<br>
- delete ~/.eclipse<br>
- reinstall Eclipse ADT-Plugin<br>
- recreate Virtual Devices<br>
- create a new project <strong>(the new project works)</strong><br>
- unpack the .apk-file and view the compiled classes with dexdump: the apk-file contains the MainActivity<br>
- I read the Android-SDK-Release-Notes for something related, but I didn't find anything<br>
- And of course, rebuild the project (clean + build, I even manually deleted the bin-folder)  </p>

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

<p>Thanks!</p>
