我需要修改现有的APK，修改源代码，然后重新编译它。

I need to modify an existing APK, modify the sources and then recompile it.

但现在我想知道如何重新编译java文件并把它们放回一个jar文件！ （罐子部分应该很容易，主要问题似乎是如何重新编译java文件对于Android）

But now I would like to know how to recompile the java files and put them back into a jar file! (the jar part should be easy, the main problem seems to be how to recompile the java files for android)

我知道一个其他的解决办法是使用apktool，然后修改smali文件，但它似乎是非常复杂的时候，我们要添加大量的code！

I know that an other solution is to use apktool and then modify the smali files, but it seems to be really complicated when we want to add a lot of code!

我的应用程序是一个基本的一个HelloWorld whitout混淆。

My application is a basic a HelloWorld whitout obfuscation.

推荐答案

感谢Chris小丑，年轻的我设法使它工作！

Thanks to Chris Jester-Young I managed to make it work!

我想我能够做到的方式，将只在非常简单的项目：

I think the way I managed to do it will work only on really simple projects:

通过apktool我得到了Android清单和ressources文件 With Dex2jar I obtained the Jar. With jd-gui I convert my Jar back to Java files.

With apktool i got the android manifest and the ressources files

在Eclipse中创建具有相同设置为旧的（检查清单文件中的所有信息）的新项目

In Eclipse I create a new project with the same settings as the old one (checking all the information in the manifest file)

/！\请确保您删除了旧的apk从设备的错误会被抛出，说明该APK签名是不一样的旧人！

/!\ be sure you removed the old apk from the device an error will be thrown stating that the apk signature is not the same as the old one!