September 2016
Beginner to intermediate
1089 pages
23h 8m
English
Content preview from Android Game Programming: A Developer’s GuideBecome 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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Chapter 7
Q1) The speed of the ball is calculated in pixels. Different devices have different numbers of pixels. Can you explain how to make the ball speed approximately the same on different screen resolutions?
A) A simple way to accommodate different screen resolutions would be to devise a system that that takes into account the number of pixels the screen has. We have already done this for the racket and ball sizes. We could declare a member variable like this:
int pixelsPerFrameX; int pixelsPerFrameY;
We could then initialize these variables in onCreate after we have obtained the screen dimensions:
pixelsPerFrameX = screenWidth/50; pixelsPerFrameY = screenHeight/50;
Then we can move our ball a bit, like this:
//moving in adjust our x any positions ...
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