动态编辑/ Java中的Android创建类 [英] Dynamically editing/creating classes in Java Android
问题描述
我要寻找一种方式来动态定义类和Android的实例化它们在运行时。从我的理解，这在Android中已经完成，我只是需要一些帮助计算出来。
I am looking for a way to dynamically define classes and instantiate them in Android, at runtime. From my understanding, this is already done in Android, I just need some help figuring it out.
我可以一个类似的结果，在Javascript和PHP。我知道它可以在Java中使用类似ASM，BCEL或者CGLIB来完成。但是，我不知道有足够的了解任何一个了解他们是否会在Android上运行。或者，他们将工作，有什么意义呢？
I can a similiar result in Javascript and PHP. I know it can be done in Java using something like ASM, BCEL or CGlib. However, I do not know enough about any of these to understand if they will work on Android. Or, of they will work, what are the implications?
如果，假设，所有三个将在Android的工作，可有人点我在正确的方向在何处开始了解它的使用，以及如何使用它？
If, hypothetically, all three will work in Android, can someone point me in the correct direction as to where to start understanding which to use, and how to use it?
我没有做过太多的Java编程，而我才刚刚最近与它在Android的工作，所以，我AP preciate所有帮助/纠正我可以得到的。随着中说，我会AP preciate如果你的答案并不是简单：不要这样做。我在寻找如何做到这一点具体，而不是如何做是正确的。至少，直到我的应用程序自带轰然倒下。 ：）
I haven't done much Java programming, and I have only just recently been working with it in Android, so, I appreciate all of the help/correction I can get. With that said, I would appreciate if your answer is NOT simply: Don't do this. I am looking for how to do this specifically, not how to do it right. At least, not until my app comes crashing down. :)
我认为，这已经发生在Android在以下几种情况：（不是100％确定）
I believe that this already happens in Android in the following situations: (Not 100% SURE)
创建从JSON对象。
AIDL
Creating an object from JSON. AIDL
推荐答案
不这样做：）
其实，我怀疑有一些这样的行为JSON库;这两个公认的方法，我知道（我不是这方面的专家，虽然）是要么建立某种形式的数据结构的控股name-value对 - 即添加内容到数据结构，但不能创建一个新的类 - 或者prepare将从一个JSON对象来填充类的模板。
I actually doubt there are JSON libraries that behave this way; the two accepted ways I know (I am not an expert on this, though) are either to create some sort of data structure holding name-value pairs - i.e. add stuff to a data structure but not create a new class - or prepare a template of a class which will be populated from a JSON object.
Java的，而静态类型，是不是真的适合在运行时创建全新的类，并没有为无反射的支持 - 尽管有一个用于访问未知类型的对象（例如查询其所有领域的支持/方法）。
Java, being statically-typed, is not really suitable for creating whole new classes at run-time, and there is no reflection support for that - though there is support for accessing objects of unknown types (e.g. querying for all their fields / methods).
在什么的能做的就是手动编写一个Java类文件 - 无论是在Java中code，然后在字节$编译它以某种方式或直接C $ç - 然后加载该文件在运行时。它的丑陋，但它会奏效。然后，它只是一样的类的任何运行时加载 - 要么你依靠加载的类的基类/接口上，或者你必须使用反射做什么有意义的事情吧。
What you can do is to manually write a java class to a file - either in Java code and then compile it somehow, or directly in bytecode - and then load that file at runtime. It's ugly, but it will work. Then it's just the same as any runtime loading of classes - either you rely on the base class / interface of the loaded class, or you have to use reflection to do anything meaningful with it.
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