March 2013
Beginner to intermediate
580 pages
16h 11m
English
Content preview from Android Programming: The Big Nerd Ranch Guide
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Messages and Message Handlers
Before you create a message, you need to understand what a Message is, and the relationship it has with its Handler, or message handler.
Message anatomy
Let’s start by looking closely at messages. The messages that a Flash might put in an inbox (its own inbox or that of another Flash) are not supportive notes, like "You run very fast, Flash." They are tasks that need to be handled.
A message is an instance of Message and contains several fields. Three are relevant to your implementation:
what | a user-defined int that describes the message |
obj | a user-specified object to be sent with the message |
target | the Handler that will handle the message |
The target of a Message is an instance of Handler. You can think of the name ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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