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A component is simply a piece of code that has a well defined life cycle e.g. Activity, Receiver, Service etc. The core building blocks or fundamental components of android are activities, views, intents, services, content providers, fragments and AndroidManifest.xml.

The screenOrientation is the attribute of activity element. The orientation of android activity can be portrait, landscape, sensor, unspecified etc. You need to define it in the AndroidManifest.xml file. For example: The common values for screenOrientation attribute are as follows: Value Description unspecified It is the default value. In such case, system chooses the orientation. portrait taller not wider landscape wider not taller sensor orientation is determined by the device orientation sensor.

Here I write code for blinking any components like TextView, ImageView etc. Here I just use AlphaAnimation class of Animation. For more details please visit the link http://findnerd.com/list/view/Blink-Animation-in-android/4620/