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Four components of Android


  • Activity (activity): stands for an interface, used to display the Android program interface,.

  • Server (services): there is no interface to the background services (equivalent to coolies, in the background, a large number of operations, connection network, etc.).

  • ConnectProvider (content provider): used to share data between different applications (more vividly, A applications provide a public excuse for B applications, which are used for B operations A databases).

  • BroadcastReceiveder (broadcast receiver): used to share data between different applications (over months for thread process communication).





  • also says that Android has fifth major components, Intent - the link to the component


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