Brill,
Views specify their preferred size by overriding onMeasure.
You've got to deal with special values representing wrap_content and
fill_parent (that's the MeasureSpec stuff):
Here is an example, it's a view that's placed inside a ScrollView and
makes itself "tall", even in landscape orientation:
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (heightMeasureSpec != 0) {
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
if (sizeHeight < sizeWidth) {
sizeHeight = sizeWidth * 3 / 2;
heightMeasureSpec = MeasureSpec.makeMeasureSpec(MeasureSpec
.getMode(heightMeasureSpec), sizeHeight);
}
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
-- Kostya
24.01.2011 7:45, Brill Pappin ?????:
Ok, I'm working on a custom view and having trouble with setting its
size so it scales properly across devices.
In particular i want its fixed height to be relative to its width (of
match_parent).
Something like this sudo code:
View myview = new View(..);
myview.setLayoutParams(new LayoutParams(
LayoutParams.MATCH_PARENT, (MATCH_PARENT / 4) * 3));
The goal would be to make the component height be 3/4's of the width.
This doesn't have to be done from outside. i.e. it could be done from
inside the view, but I'm unsure what I need to override inside my
view implementation to set the height. Set it too early and i may not
yet have my width, set it to late and I may just end up on a resize
race loop :)
So, my question is, what is the proper way to make a
View dynamically sized at runtime in at least one of the dimensions?
- Brill Pappin
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