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"Let's tell the story of three little pigs building a house tonight!"The top ViewGroup here is MainActivity (DecorView). First, the down event is sent to the child view, then the child view does not consume it, and then it is handed over to the parent view for consumption layer by layer. Finally, no one consumes it back to MainActivity, and the down event ends. From the above source code analysis, it can be seen that the mFirstTouchTarget is empty at this time. If the move event comes, the else interception event of the source code number 2 part will be directly executed, so the log of the subsequent event will not be distributed as above (and the log of the onInterceptTouchEvent () method will not be called at the same time). If the child view consumes the down event, mFirstTouchTarget is not empty, and the process of subsequent events is similar to down. Readers can modify MyView's onTouchEvent () to consume the down event and try to consume the down event.香荽忙摇头道：王翰林说得我都不好意思了。Three handshakes./sniff (inhale)2.2 Disadvantages