Fragments : what is the best place to measure Views?

Issue

I have a fragment and I need to measure location/width/height of its views on screen and pass to some other class.

So what I have is a function which does it, something like this :

private void measureTest(){
    v = ourView.findViewById(R.id.someTextField);
    v.getLocationOnScreen(loc);
    int w = v.getWidth();
    ...
    SomeClass.passLocation(loc,w);
    ...

The problem is that the location/width/height of views is not ready within fragment lifecycle. So if I run that function within these lifecycle methods :

onCreateView
onViewCreated
onStart
onResume

I either get wrong location and width/height measurments or 0 values. The only solution I found is to add a GlobalLayoutListener like this to mainView

mainView.getViewTreeObserver().addOnGlobalLayoutListener(new     ViewTreeObserver.OnGlobalLayoutListener() {
public void onGlobalLayout() {
    if(alreadyMeasured)
        mainView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
    else
        measureTest();
}
});

this gets the job done.. but its just Yack! IMO.

Is there a better way of doing this? seems like such a basic thing to do

Solution

There is no better way. That code isn't that bad! It's fired as soon as the view is layed out (my terminology might be a bit weird there) which happens right after measuring. That is how it is done in the BitmapFun sample (see ImageGridFragment, line 120) in Google's Android docs. There is a comment on that particular piece of code stating:

 // This listener is used to get the final width of the GridView and then calculate the
 // number of columns and the width of each column. The width of each column is variable
 // as the GridView has stretchMode=columnWidth. The column width is used to set the height
 // of each view so we get nice square thumbnails.

Answered By - Bradley Campbell