two of my Graphical Layout components are missing

I've recently started Eclipse and Android programming and I notices that alot of my Visual Components are missing their classes.

Such as the Sliding Tab (which I need for my UI) which only gives me this message when placed:

error! ClassCastException: com.android.layoutlib.bridge.MockView cannot be cast to android.view.ViewGroup Exception details are logged in Window > Show View > Error LogTh开发者_运维知识库e following classes could not be found: - SlidingDrawer

And with the Tabhost & TabWidget:

Error during post inflation process: TabHost requires a TabWidget with id "android:id/tabs". View found with id 'tabs' is 'com.android.layoutlib.bridge.MockView' The following classes could not be found: - TabWidget

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Answers would be much appreciated

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This seems like a bug in the Layout Editor:
http://code.google.com/p/android/issues/detail?id=2021

I have the same issue, and only way you can do tabs, is to write it in xml. Hope it gets fixed soon.

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I had the same problem as in the original Question, I think. At least the problem with "TabHost" and "TabWidget". Not even copy-paste out of this tutorial works! http://developer.android.com/resources/tutorials/views/hello-tabwidget.html

But I now found a tutorial with sourcecode that actually works. Don't know why though at the moment. Just try it. http://www.androidpeople.com/android-tabhost-tutorial-part-1/

There is another thing that I noticed. If I change the target plattform to Android 3.0 the graphical layout designer works without problems!

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There are ongoing improvements in the rendering libraries for the graphical editor.

See this issue for details: http://code.google.com/p/android/issues/detail?id=2021

Buried in there is a reference to the workarounds:

• Switch your platform for the graphical editor to a higher one, or
• Update to the latest ADT (r12 as of this writing) and install the preview rendering libraries. This approach is detailed at the tools site: http://tools.android.com/download

The latter solution resolved the problems for me with the TabWidget. Hopefully all will be integrated by r13 of the tools and the preview libraries won't be needed.