(A collection of Android interview questions with specific answers. This year's written examination interview will basically ask about the brothers who want to get more than 5K. 1、?? What are the four components of Android and their effects? A: Activity: Activity is a window for Android programs to interact with users, and is the most basic kind of Android structural blocks. It needs to do a lot of durable work, properly manage the life cycle and some jump logic services to adhere to the status of various interfaces. Background services are used for activities, encapsulating a complete functional logic termination, accepting upper level commands, and terminating related things, Define the synchronous and asynchronous interfaces provided by Intent. ContentProvider: It is an access scheme for data used by a third party provided by Android. It can derive ContentProvider classes and provide data externally. It can select and sort data as a database, mask the storage details of internal data, and provide a consistent excuse model externally, greatly simplifying the use of upper layers, The combination of data provides a more convenient way BroadCastReceiver: to accept one or more kinds of intents to trigger things, to accept related messages, to do some simple management, and to convert into a notification, which is consistent with the Android event broadcast model......
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