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Learning Android Intents by Wajahat Karim, Muhammad Usama bin Aftab

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Android Activity lifecycle

An Android application consists of one or more activities. These activities are visual representations of an application in transitioning flow while performing the task, taking user inputs, and showing results to the user. Each activity presents the user with a visual representation on the screen for user interaction. Android keeps all the activities in a back stack following the last in, first out rule. Whenever a new activity is started, the current activity is pushed in the back stack. Thus, Android gives focus focuses on the new activity. The activity can take up the whole screen of the device, or it can also take part of the screen, or it can be dragged as well. Whether it is an activity taking the whole area of ...

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