The "solution #2 (dynamic)" in this question/answer post:
overlay two images in android to set an imageview
is very close to what I want to do, which is to dynamically create a layer-list (for a status bar notification icon, I want to build-up my icon in layers), but the icon assignment in the notification API requires a resource ID (which I want to call from a service).
I cannot figure-out how to build a dynamically build a layer-list without building hundreds of layer-list .xml files (for the various combinations of icons that I would like to be able to display). Daniel's "solution #1" works wonderfully for the static .xml files, but I'm looking for a more elegant, dynamic solution.
In the above post, the code snippet:
Resources r = getResources();
Drawable[] layers = new Drawable[2];
layers[0] = r.getDrawable(R.drawable.t);
layers[1] = r.getDrawable(R.drawable.tt);
LayerDrawable layerDrawable = new LayerDrawable(layers);
appears to be what I want, but I don't know or understand how to "assign" the new layerDrawable to my notification icon (which takes a resource ID).
Thanks to all...stackoverflow is a wonderful resource!
There is no such thing as an ID for a Drawable created at runtime. Those IDs refer to int fields in the R class, automatically created from the xml files.
Since the LayerDrawable constructor requires just a Drawable array, you can provide those Drawables made from any method. An example, would be the static method Drawable.createFromStream(InputStream is, String srcName).