是否有关于Android的数学EX pression解析库? [英] Is there a mathematical expression parsing library on Android?
问题描述
目前我已经在iOS上,我希望端口到Android的应用程序。该应用程序使用的Objective-C GCMathParser 框架/班。
Currently I have an app on iOS that I am looking to port to Android. This app uses the Objective-C GCMathParser framework/class.
我要寻找在Android更换(或方法,使在Android GCMathParser工作),这将是能够计算的东西,如:
I am looking for a replacement on Android (or a way to make GCMathParser work on Android) that would be able to calculate stuff like:
2*2
(2+3)+2
((2+3)+2)/5
(-2 + sqrt((-5^2)-4*2*3))/(2 * 2)
我想能够养活一个字符串到这个(如上),并得到一个结果,preferably相对precise(如双)。
I would like to be able to feed a String into this (like above) and get back a result, preferably relatively precise (like double).
我有什么选择解析数学EX pressions这样在Android?
What options do I have for parsing mathematical expressions like this on Android?
推荐答案
怎么样的 MVEL ?
Map vars = new HashMap();
vars.put("x", new Integer(5));
vars.put("y", new Integer(10));
Integer result = (Integer) MVEL.eval("x * y", vars);
您也可以使用它在普通的Java调用,例如的Math.sqrt(...)
You could also use plain Java calls in it like Math.sqrt(...)
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