Is there really no XML attribute counterpart to
If not, what alternatives are there?
No, there is not, see how the "Related XML Attributes" section is missing in the ImageView.setAlpha(int) documentation. The alternative is to use View.setAlpha(float) whose XML counterpart is
android:alpha. It takes a range of 0.0 to 1.0 instead of 0 to 255. Use it e.g. like
However, the latter in available only since API level 11.
It's easier than the other response.
There is an xml value
alpha that takes double values.
android:alpha="0.0" thats invisible
android:alpha="1.0" full visible
That's how it works.