子类视图的onDraw（） [英] Subclassing view and onDraw()

问题描述

我有两个图像，一幅图像是静态意味着它不会在所有的移动，另一个图像10 * 10圈将需要移动到精确的像素上其他顶级image.Doing一些研究，我认为我需要重写的onDraw（）method.Although我真的无法找到任何样品code让我开始。

I have two images,One image will be static meaning it will not move at all,another image a 10*10 circle will need to move to exact pixels on top of the other image.Doing some research I see I need to override the onDraw() method.Although I could not really find any sample code to get me started.

那么，我问是一个很好的教程或一些帮助的链接开始。

So what I am asking is a link to a good tutorial or some help getting started.

感谢

推荐答案

这是从Android开发者网站，应该给你一些背景信息的简要概述。

This is a brief overview from the Android Developer site that should give you some background information.

developer.android.com/guide/topics/graphics/index.html#draw-with-canvas

developer.android.com/guide/topics/graphics/index.html#draw-with-canvas

此外，如果你去这里你可以看到我的code绘制的图表。它会给你，你可以使用其他方法的一些例子。该的onDraw（）方法是行＃444请记住，您需要调用无效（）你想要的视图上绘制调用每次。

Also, if you go here you can see my code for drawing a Graph. It'll give you some examples of other methods you can use. The onDraw() method is at line # 444. Keep in mind you need to call invalidate() every time you want the view to call on Draw.

<一个href=\"http://$c$c.google.com/p/calculus-tools/source/browse/DerivativeLibrary/src/com/andymc/derivativelibrary/GraphView.java\" rel=\"nofollow\">http://$c$c.google.com/p/calculus-tools/source/browse/DerivativeLibrary/src/com/andymc/derivativelibrary/GraphView.java

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