Touch event Transmission

① Trigger dispatchtouchevent of activity ② trigger onuserinteraction of activity ③ trigger dispatchtouchevent of layout (I .e. viewgroup) ④ trigger onintercepttouchevent of layout (I .e. viewgroup) ⑤ trigger ontouchevent of view at last. Details: when a touchevent occurs, the activity first transmits the touchevent to the top-level viewtouchevent and then distributes the dispatchtouchevent Method to the top-level view. If the dispatchtouchevent method returns true, the ontouchevent is handed over to the view for processing. If dispatchtouchevent returns false, it is handed over to the view's interceptt The ouchevent method determines whether to intercept this event. If intercepttouchevent returns true, that is, if it is intercepted, the ontouchevent is handed over to it for processing. If intercepttouchevent returns false, it is passed to the subview, the dispatchtouchevent of the sub-view is used to distribute the event. If the event is passed to the ontouchevent of the subview of a certain layer, the method returns false, and the event will be passed up from this view, which is received by ontouchevent. If false is returned when the ontouchevent is passed to the top, the event will disappear and the next event will not be received.