Overview
•Android Application Components
•Activities
•What is Activity.
•Understanding Activities.
•Activity lifecycle.
•Services
•Content Providers
•Broadcast Receivers
•Additional Components
Activities
Activity is an individual user interface screen in an Android Application where visual elements called Views (also known as widgets) can be placed and the user can perform various actions by interacting with it. Consider the figure. The whole window gives the user an interface to interact with and therefore this complete screen makes an Activity. The controls placed in the window allows the user to perform certain actions and are called Views or Widgets. The widgets in an Activity can be created in two different ways, by pure java code and by adding XML code to define the UI. The latter is always preferred. An application can have more than one Activity and each Activity operates independently, but can be linked to one another and each Activity you create must be defined in your application’s manifest file. Each Activity in android will be subclass of Activity class defined in Android SDK.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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