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The SYN-ACK retransmission number server sends the SYN-ACK packet. If the customer confirmation packet is not received, the server retransmits for the first time, waits for a period of time but still does not receive the customer confirmation packet, and retransmits for the second time. If the retransmission number exceeds the maximum retransmission number specified by the system, the system deletes the connection information from the semi-connection queue. Note that the waiting time for each retransmission is not necessarily the same.Generally, it includes the following 11 parts:Description:Name: Wang ZhaSay a word and do a thing.I manually added a few comments to the above log. By default, Activity/ViewGroup/View does not intercept non-consumption events. It is easy to see from the log that the down event has gone through the following process, the following is the distribution process, and the following is the consumption process. If no one intercepts the distribution, the event will be passed down to the child view. If the child view does not consume the event, it will be passed to the parent view for consumption, i.e. The onTouchEvent of the parent view will be called back in turn.