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                        Passing wrong args to View.measure()
You definetely cannot understand View measuring process and write such code:
mToolTipViewGroup.measure(FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT);
You have to pass an int representing a MeasureSpec, this done with MeasureSpec.makeMeasureSpec(int, int) static methods.
By the way, this library is visually nice !