When trying to create an ImageView, you cannot use the splashscreen images (default.png) on Android. The usecase is a dynamic loading screen that is displayed while the app is starting up. This loading screen must have the splash image as the background so it looks like the default splash screen of the app.
Neither the standard default.png nor the density-specific images can be referenced to use as background for the window or image parameter for an ImageView.
The warning in the console is:
[WARN] : TiDrawableReference: (pool-3-thread-1) [1889,1889] Could not open stream to get bitmap
A workaround is to duplicate every default.png in every folder, and rename it to something else (default2.png or test.png for instance). Then it does find the resource.