What is a ViewTreeObserver in Android ?
A view tree observer is used to register listeners that can be notified of global changes in the view tree. Such global events include, but are not limited to, layout of the whole tree, beginning of the drawing pass, touch mode change. A ViewTreeObserver should never be instantiated by applications as it is provided by the views hierarchy. getViewTreeObserver() method returns the ViewTreeObserver for this view's hierarchy though The returned ViewTreeObserver observer is not guaranteed to remain valid for the lifetime of this View.
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