DesignSpec as Drawable.

[pepyakin]

What about Drawable adapter to design spec?
I see following use case for it.

public class DesignSpecDrawable extends Drawable {
    private final DesignSpec mDesignSpec;

    public DesignSpecDrawable(DesignSpec designSpec) {
        mDesignSpec = designSpec;
    }

    @Override
    public void draw(Canvas canvas) {
        if (mDesignSpec != null) {
            mDesignSpec.draw(canvas);
        }
    }

    /* ... */
}

setContentView(R.layout.main_activity);
/* Resolve views here */

View decorView = getWindow().getDecorView();
mDesignSpec = DesignSpec.fromResource(decorView, R.raw.main_activity_spec);
DesignSpecDrawable drawable = new DesignSpecDrawable(mDesignSpec);
decorView.getOverlay().add(drawable); 

The main advantage that is dspec now controlled from the code. It means we can now easily make it conditional, like:

if (BuildConfig.USE_DSPEC) {
  // ...
}

So it can be stripped from production builds with ease.

However, there is one problem ViewOverlays are only available since API 18 (JB 4.3). Although, we can still use it below this API level by setting it as background, or ImageView or so on, which is not so convient.

[lucasr]

That's a nice idea. DesignSpec is now a Drawable. You can just do:

DesignSpec designSpec = DesignSpec.fromResource(someView, R.raw.some_spec);
someView.getOverlay().add(designSpec);

[pepyakin]

Great! Thank you.