Setting textSize in custom view results in huge text

Try the following instead:

line1Size = a.getDimensionPixelSize(R.styleable.StackedTextView_line1_textSize, 0);
line2Size = a.getDimensionPixelSize(R.styleable.StackedTextView_line2_textSize, 0);

if (line1Size > 0) {
    holdr.textLine1.setTextSize(TypedValue.COMPLEX_UNIT_PX, line1Size);
}
if (line2Size > 0) {
    holdr.textLine2.setTextSize(TypedValue.COMPLEX_UNIT_PX, line2Size);
}