* A Handler is a mechanism to drop a message on the main queue (more precisely, the queue attached to the thread on which the handler is instantiated) so that the message can be processed at a later point in time by the main thread.
* The message that is dropped has an internal reference pointing to the handler that dropped it.
* When the main thread gets around to processing that message, it invokes the handler that dropped the message through a callback method on the handler object.This callback method is called handleMessage.
* The Key players that work together when we talk about handlers are :
- Main thread.
- Main thread queue.
- Handler.
- Message.
* The message that is dropped has an internal reference pointing to the handler that dropped it.
* When the main thread gets around to processing that message, it invokes the handler that dropped the message through a callback method on the handler object.This callback method is called handleMessage.
* The Key players that work together when we talk about handlers are :
- Main thread.
- Main thread queue.
- Handler.
- Message.
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