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The full name of UDP protocol is user datagram protocol. It is used to process data packets like TCP protocol in the network and is a connectionless protocol. In the OSI model, the fourth layer, the transport layer, is the next layer above the IP protocol. UDP has the disadvantages of not providing packet grouping, assembling and sorting packets, that is, when the message is sent, it is impossible to know whether it arrives safely and completely.　　原来当年上学时姜洪武、郭小东、吕梅是非常要好的同班同学。吕梅暗中喜欢姜洪武，而郭小东又追求吕梅。姜洪武为了成全郭小东经常给吕梅和郭小东制造机会。王文俊当时经常约会吕梅，有一次，喝了酒的姜洪武、郭小东发现王文俊在拉扯吕梅，姜洪武控制不住自己和王文俊打了起来。郭小东拉着吕梅离开了现场。…,有的人甚至对韩信多有不满和骂骂咧咧，但是现在即便是想要指责韩信。Stephen: English Christian name + Greek derived from the Middle Ages, meaning "crown", English surname, male first name, nicknames Steenie, Steve, Stevie.板栗见皇帝沉吟不决，奇怪地唤道：皇上？皇上可是有难碍之处？若有，不妨吩咐臣，臣过完年就赶紧回来。There is no replication of onToucheEvent in ViewGroup, but ViewGroup itself is View, and onToucheEvent is in View.DecorView is a ViewGroup that distributes MotionEvent to each child view