January 2014
Intermediate to advanced
736 pages
70h 43m
English
Content preview from Android™ How to Program, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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touchMoved Method of Class DoodleView
The touchMoved method (Fig. 7.30) is called when the user moves one or more fingers across the screen. The system MotionEvent passed from onTouchEvent contains touch information for multiple moves on the screen if they occur at the same time. MotionEvent method getPointerCount (line 222) returns the number of touches this MotionEvent describes. For each, we store the finger’s ID (line 225) in pointerID, and store the finger’s corresponding index in this MotionEvent (line 226) in pointerIndex. Then we check whether there’s a corresponding Path in the pathMap HashMap (line 229). If so, we use MotionEvent’s getX and getY methods to get the last coordinates for this drag event for the specified pointerIndex
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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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