Calculate the size of a list view or how to tell it to fully expand

Question

I am currently trying to use a ListView inside of a ScrollView. I know from what I\'ve read that this is looked down upon, but I\'m trying to get the ListView to expand com

Answer 1

I've been researching on how to do this, and although the question has already been answered, I'd like to provide a solution that I think is better:

Looking at the ListView's source code you can see the following inside the onMeasure(...) code:

if (heightMode == MeasureSpec.AT_MOST) {
     // TODO: after first layout we should maybe start at the first visible position, not 0
     heightSize = measureHeightOfChildren(widthMeasureSpec, 0, NO_POSITION, heightSize, -1);
}

So simply call the listView's measure and pass MeasureSpec.AT_MOST for the height instead of the usual MeasureSpec.UNSPECIFIED.

I do the following to measure a listview and place it inside a popup-window:

    int widthMeasureSpec = MeasureSpec.makeMeasureSpec(displayMetrics.widthPixels, MeasureSpec.EXACTLY);
    int heightMeasureSpec = MeasureSpec.makeMeasureSpec(displayMetrics.heightPixels, MeasureSpec.AT_MOST);
    mCatalogView.measure(widthMeasureSpec, heightMeasureSpec);

    mPopup.setWidth(mCatalogView.getMeasuredWidth());
    mPopup.setHeight(mCatalogView.getMeasuredHeight());