Understanding Android Activity lifecycle

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Usually, an Android application consists of more than one activity. These activities are loosely bounded with each other. It is a good practice to create each activity for a specific task to be performed. For example, in a simple phone dialing application, there might be one activity to show all contacts, one to show full contact details of any specific contact, one for dialing a number, and so on. In all the applications, there is a main activity that behaves as the starting point of the application. This activity starts when the application is launched. Then this activity starts some other activity, which starts another, and so on. Android manages all the activities in a back stack.

Learning Android Intents

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This book really helped me in best understanding how to use Android Intents and contains lots of useful aspects and incredibly informative content that no one knows about Intents.

You can buy Learning Android Intents from the Packt Publishing website:
http://www.packtpub.com/learning-android-intents/book