Since VectorDrawable is only in Android 5.0+, and one would presumably use 
plain old raster drawables before then, I came up with a scheme. 

I put face.png in drawable-nodpi.
I put face.xml in drawable-v21

Then, when I need the drawable in my custom view, I call. 

Drawable drawFace =getResources().getDrawable(R.drawable.face);

I sure thought I was clever.

So of course, this will retrieve a VectorDrawable if it is running on 
Android 5.0 or later, and a BitmapDrawable if it is running on 4.4 or 
earlier, right?

Nope. 

I debugged on a Nexus 9. The type of the returned Drawable was 
BitmapDrawable. 

To add to the mystery, I debugged on Android Wear device with Android 5.0

The drawable comes up as a VectorDrawable, just as I wanted. 

Why wouldn't that happen on a tablet with Android 5.0? The targetSDK is 21. 
The BuildTools version is 21.1.1. The minimum SDK is 17. 

The VectorDrawable class has only a default constructor. I don't know how 
to force a VectorDrawable to load if I went that route. 

Nathan

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