P.S - Maybe its because of there's missing code here, but it seems like you're just having the parent layout having the same size as the child layout (basically both have wrap_content on width and height)... why do you need a custom class for that?
On Saturday, March 2, 2013 8:10:17 AM UTC+2, momo wrote:
-- On Saturday, March 2, 2013 8:10:17 AM UTC+2, momo wrote:
I have a custom ViewGroup that's only ever managing the size and position of one child. I've override onMeasure and onLayout so that LayoutParams are never examined, yet it fails unless I do provide LayoutParams. Here are abbreviated summaries of the relevant portions of the class:public class SomeSpecialLayoutManager extends ViewGroup {@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {measureChildren(widthMeasureSpec, heightMeasureSpec); int w = mChild.getMeasuredWidth();int h = mChild.getMeasuredHeight();w = Math.max(w, getSuggestedMinimumWidth());h = Math.max(h, getSuggestedMinimumHeight());w = resolveSize(w, widthMeasureSpec);h = resolveSize(h, heightMeasureSpec);setMeasuredDimension(w, h);}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {mChild.layout( 0, 0, mWidth, mHeight );}}Using the above, the following *does* work:LayoutParams lp = mChild.getLayoutParams();lp.width = mWidth;lp.height = mHeight;mChild.setLayoutParams( lp );But since neither `onMeasure` nor `onLayout` even makes reference to `LayoutParams`, I wonder why it's required, or even how it's referenced at all. I would assume that since the layout pass grabs `mWidth` and `mHeight` directly, there'd be no need for the `LayoutParams` at all - and that a call to requestLayout would update it appropriately.However, when I isolate the above in a small program outside of a complicated View tree with scrolling layers that exceed "normal" container sizes, it *does* work as expected, so I have to assume the issue is in the measure pass.I've read as much documentation as I can find about what's going on during the measure and layout passes, and examined the source, but I believe I must be missing something.TYIA.
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