I am seeing the exact same thing. Does anyone have an answer to this?
On Friday, March 2, 2012 7:39:16 PM UTC-5, momo wrote:
>
> I've got a custom layout for positioning tooltips on a pan-n-zoom tiled
> map (also custom), in reaction to touch events. The tooltips should appear
> above and centered to the marker that fired it.
>
> Everything works perfectly when using normal Views (ImageView, TextView)
> as children. However, when trying to use a ViewGroup (e.g., a
> RelativeLayout), the child does not appear at all.
>
> I added some logging to onLayout, and it was reporting 0 for
> child.getMeasuredWidth()/Height(), so I extended RelativeLayout and
> overrode onMeasure in order to supply the correct dimensions. The
> dimensions are now logging correctly, but still the child ViewGroup does
> not appear. This doesn't seem like it's a necessary step in any case - I'd
> expect to be able to use layouts as children normally.
>
> Why is there a difference? Why would a simple View appear and position
> exactly as expected, but child layouts fail to render at all?
>
> Here's a summarized version of the custom layout:
>
> public class TooltipLayout extends ViewGroup {
>
> public TooltipLayout(Context context) {
> super(context);
> }
>
> @Override
> protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
> //...
> }
>
> @Override
> protected void onLayout(boolean changed, int l, int t, int r, int b) {
> int count = getChildCount();
> for (int i = 0; i < count; i++) {
> View child = getChildAt(i);
> if (child.getVisibility() != GONE) {
> TooltipLayout.LayoutParams lp =
> (TooltipLayout.LayoutParams) child.getLayoutParams();
> child.layout(lp.x, lp.y, lp.x + child.getMeasuredWidth(),
> lp.y + child.getMeasuredHeight());
> }
> }
> }
>
> public static class LayoutParams extends ViewGroup.LayoutParams {
>
> public int x;
> public int y;
>
> public LayoutParams(int width, int height, int left, int top) {
> super(width, height);
> x = left;
> y = top;
> }
> }
> }
>
> TYIA.
>
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