Google just released a new version of Android SDK Tools (rev. 24.3). This version breaks the Xamarin.Android designer: Bug 30556.
The fix for the designer Bug 30556 has now been released to the Stable channel:
If you still see Bug 30556 after updating, or if you find any additional bugs caused by Android SDK Tools (rev. 24.3), please file a bug report and add a comment back on this thread with the bug number. Thanks! (If that link redirects to the top-level
kb.xamarin.com/ page the first time you click it, try clicking it once more.)
If you do not yet wish to upgrade your XamarinVS or Xamarin Studio version, or if you run into any additional bugs with rev 24.3 other than Bug 30556, you can downgrade the Android SDK Tools.
tools directory in the Android SDK path. One way to find the right directory is to open "Tools -> Open Android SDK Manager" in Xamarin Studio or "Tools -> Android -> Android SDK Manager" in Visual Studio. The
tools subdirectory can be found within the "SDK Path" that is displayed at the top of the SDK Manager window.
tools_r24.2-*.zip file into the "SDK Path", creating a directory named "tools". Be careful not to create an extra outer "tools" directory when unzipping this file: the top-level "SDK path" should contain
The layout could not be loaded: The operation failed due to an internal error: com.android.ide.common.rendering.api.SessionParams.(Lcom/android/ide/common/rendering/api/ILayoutPullParser;Lcom/android/ide/common/rendering/api/SessionParams$RenderingMode;Ljava/lang/Object;Lcom/android/ide/common/rendering/api/HardwareConfig;Lcom/android/ide/common/rendering/api/RenderResources;Lcom/android/ide/common/rendering/api/IProjectCallback;IILcom/android/ide/common/rendering/api/LayoutLog;)V.