blocks|key|810395|text|我不知道为什么Dalvik会拒绝类，除非它们被某种工具混淆了。您试过从源代码重新编译Box2d吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|810396|我唯一看到的其他Java是http://www.cokeandcode.com/phys2d/|offset|length|810397|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cokeandcode.com/phys2d/^0|0|D|Y|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I don't know why Dalvik would reject classes unless they were obfuscated with some tool. Did you try recompiling Box2d from source?

The only other Java lib I've seen is <a href="http://www.cokeandcode.com/phys2d/" rel="nofollow noreferrer">http://www.cokeandcode.com/phys2d/</a>

blocks|key|936894|text|我在Java版本的APE中使用不动点数学，而不是浮点数，我得到了很好的结果。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|936895|http://www.cove.org/ape/|offset|length|936896|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|O|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

I am getting good results with the Java version of APE using Fixed Point math rather than floats.

<a href="http://www.cove.org/ape/" rel="nofollow noreferrer">http://www.cove.org/ape/</a>

blocks|key|810548|text|我已经完成了APE引擎的实现，现在使用(大部分)不动点数学，它没有垃圾收集。这是一个很好的引擎来做有约束的东西，但似乎不太适合真正的刚体。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|810549|http://code.google.com/p/ape-physics-for-android/|offset|length|810550|您还可以查看花栗鼠的NDK端口(+youtube页面上的下载链接)。|810551|GFjfmLTc|810552|entityMap|0|LINK|mutability|MUTABLE|url|1|http://www.youtube.com/watch?v=_i_GFjfmLTc^0|0|0|1D|0|0|0|0|8|1|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]]|A|$]]|$1|J|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|C]]|Q|$5|M|N|O|A|$P|R]]]]

I have done an implementation of the APE engine now using (mostly) fixed point math and it is without garbage collection. Its a pretty nice engine to do stuff with constraints but seems less suited for really rigid bodies.

<a href="http://code.google.com/p/ape-physics-for-android/" rel="nofollow noreferrer">http://code.google.com/p/ape-physics-for-android/</a>

You could also look into the NDK port of Chipmunk (download link on youtube page)

<a href="http://www.youtube.com/watch?v=_i_GFjfmLTc" rel="nofollow noreferrer">http://www.youtube.com/watch?v=_i_GFjfmLTc</a>

blocks|key|936866|text|还请看@+Glaze，它是为数组优化的。从AS3到Java可能不是一个可怕的端口(它也被移植到Haxe+)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|936867|http://code.google.com/p/glaze/|offset|length|936868|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|V|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

Also look @ Glaze which is optimized for arrays .. might not be a horrible port to Java from AS3 (it was ported to Haxe also)

<a href="http://code.google.com/p/glaze/" rel="nofollow noreferrer">http://code.google.com/p/glaze/</a>

blocks|key|810462|text|我不确定，jBox2D是否真的适合智能手机。我更愿意看看J2ME引擎，因为它们对性能进行了高度优化-例如：http://emini.at。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|810463|此外，您应该对集成没有任何问题。|810464|entityMap|0|LINK|mutability|MUTABLE|url|http://emini.at/^0|1H|F|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

I am not sure, if jBox2D is really suitable for smartphones. I would rather look at J2ME engines, as they are highly optimized for performance- E.g: <a href="http://emini.at" rel="nofollow noreferrer">http://emini.at</a>

Also you should have no problems with integration.

blocks|key|2336763|text|Libgdx有内置的JBox2D和跨平台(Android、Java、GWT+)，比如团结，它是免费的和开源。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2336764|我在15分钟内建立了它，很快就开始创建物理体了。Libgdx物理手册从那里起起了作用。祝好运!|2336765|entityMap|0|LINK|mutability|MUTABLE|url|http://libgdx.badlogicgames.com/|1|http://www.jbox2d.org/|2|https://github.com/libgdx/libgdx/|3|http://code.google.com/p/libgdx/wiki/PhysicsBox2D^0|0|6|0|A|6|1|1F|2|2|0|O|A|3|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]|$A|X|B|Y|1|Z]|$A|10|B|11|1|12]]|C|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|F|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]|R|$5|I|J|K|C|$L|S]]]]

<a href="http://libgdx.badlogicgames.com/" rel="nofollow">Libgdx</a> has <a href="http://www.jbox2d.org/" rel="nofollow">JBox2D</a> built in and is cross platform (Android, Java Desktop, GWT Web) like Unity, tho it's free and <a href="https://github.com/libgdx/libgdx/" rel="nofollow">open source</a>. 

I got it set up in 15 minutes and was creating physics bodies in no time. The <a href="http://code.google.com/p/libgdx/wiki/PhysicsBox2D" rel="nofollow">Libgdx physics manual</a> helps from there. Good luck!

I've looked around for a physics engine that will play nicely with Android, but I've only been disappointed.

In terms of performance, I had heard that jbox2d was the best bet, but (from my understanding) ever since Android SDK V1.0, the Dalvik VM's verifier has become very strict and rejects some of the key classes and refuses to run. This problem persists after using the dx tool (although I might be using the tool improperly).

I know that the AndroidBox2D porting project exists to optimize jbox2d for the Android garbage collector, but the project page doesn't have any downloads and the gpl license isn't as attractive as the zlib license of the original.

Does anyone have any tips for making jbox2d work in Eclipse, or have any recommendations for where I should start looking?

Are there any decent physics engines for Android?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我四处寻找一个能很好地使用Android的物理引擎，但我只感到失望。在性能方面，我听说jbox2d是最好的选择，但是(据我理解)自从AndroidSDKV1.0之后，Dalvik的验证器变得非常严格，拒绝一些关键类并拒绝运行。这个问题在使用dx工具后仍然存在(尽管我可能不正确地使用该工具)。我知道AndroidBox2D移植项目的存在是为了优化安卓垃圾收集器的jbox2d，但是项目页面没有任何下载

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