[android-developers] why subview doesn`t appear

i create a custom viewgroup extends ViewGroup,and only override
onLayout method. in the method, i call layout method for subview.And
them call addView method of the new created viewgroup, and add a
subview. but the subview doesn`t appear. when i check it using
hierarchyviewer, i saw the mTop, mRight, mBottom and mLeft are all
zero. i think i must have do something wrong in the custom viewgroup.
thanks

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