I read a statement on http://developer.android.com that said:
When an application is launched, the system creates a thread of execution for the application, called "main." This thread is very important because it is in charge of dispatching events to the appropriate user interface widgets, including drawing events. It is also the thread in which your application interacts with components from the Android UI toolkit. The system does not create a separate thread for each instance of a component. All components that run in the same process are instantiated in the UI thread, and system calls to each component are dispatched from that thread.
I just wanted to know why Android has opted for this single threaded model architecture and not gone for multi-threaded. What are the advantages that they are getting out of this?