We tried to strike a balance between providing a thorough reference without overwhelming you with details you won't need to know when developing the average Android application. Instead, we focused on the details you need to know to move forward developing Android applications and to understand every example provided within this book.
Activity and View classes are the core building blocks of any Android application. Each Activity performs a specific task within the application, often with a single user interface screen consisting of View widgets. Each Activity is responsible for managing its own resources and data through a series oflifecycle callbacks.The transition from one Activity to the next is achieved through the Intent mechanism.An Intent object acts as an asynchronous message that the Android operating system processes and responds to by launching the appropriate Activity or Service.You can also use Intent objects to broadcast system-wide events to any interested BroadcastReceiver applications listening.
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