Android: filler / divider between columns in a TableLayout

Android is pretty tricky to deal with at times, and surprisingly difficult for something very simple..

..like adding a filler between columns in a TableLayout. "Gotta be simpler!" I thought after having spent countless minutes reading up over countless suggestions and recipes.

So I took the path of just creating an empty filler.png image in the mspaint, just a vertical bar, and inserting it programmatically:

ImageView dividerView = new ImageView(this);
dividerView.setImageResource(R.drawable.filler);

Then added this to a TableRow object which subsequently should be added to the aforementioned TableLayout.

Before adding a divider:

After adding a divider: