What is Android ? Android is an open-source software stack for mobile devices that includes an operating system, middleware and key applications. And it is based upon a modified version of the Linux kernel
Android History Google Inc. purchased the initial developer of the software in 2005. from Android Inc. which was founded in Palo Alto, California, United States in October, 2003 by Andy Rubin, Rich Miner.
Android Application Activities: user-facing components that present UI to interact with. Services:processes that work in the background and don’t have a visible background Content Providers: components make parts of your application data available to other applications
Android Application Intents: messages created by the system or application themselves that are then passed on to any interested party. Broadcast Receivers: These react to specific intents, and might execute an action.
Input handling (1/4) Processing Single Touch Events: Touch Events are passed to an OnTouchListener interface implementation that we register with a view. The OnTouchListener interface has only a single method Public abstract booleanonTouch(View v, MotionEvent event)