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Android开发四大组件分别是:流动(Activity):关于发挥功能。服务(Service):后台运行服务,不提供界面出现。播送接收器(BroadcastReceiver):关于接收播送。内容提供商(ContentProvider):支持在多个使用中存储和读取数据,相当于数据库。

(The four components of Android development are: Activity: about playing functions. Service: the background running service does not provide an interface. BroadcastReceiver: about receiving broadcasts. Content Provider: supports storing and reading data in multiple uses, equivalent to a database.)

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