Question

I made a program on Android. But this is my thesis and I have to give my project to my lecturer. Well I dont want to show some of the code that I wrote. Then I want to encrypt something. If I give him the completed project then he can look at every part of the codes. I don’t know Java that well. I was thinking that I can create something like a dll file in Java (I dont know what it is in Java?) and do some obfuscation. And then I can use this dll file in my project then the lecturer can’t see all the code.

I hope I explained it. It’s not an apk file. It’s a project and I want to hide some code as dll or whatever.

Edit: How do I create a JAR from an Android project?

Answer 1

You can export your class(es) to JAR file(s), then add them to the build path of your project that will be given to the lecturer.

However, when exporting, remember not to export the source of the classes. I don’t know which IDE you are using, but in Eclipse, just right click the project, choose Export, and check any files you want.

EDIT: To answer your question in the comment below:

For example, you have Operator class, which has Add, Subtract, Multiply, Divide static methods in it. Now, you want to call Add(1, 3) in your project (which you will give away), and don’t want people know how the Add method works. So now, when exporting the JAR file, just check the namespace that contains Operator class. Consider the JAR file name is Operator.JAR.

Copy the Operator.JAR file into your project folder (anywhere will works, but I recommend \lib\Operator.jar). Right click the copied file, choose Build Path -> Add to build path.

Now in the project, you type in the code Operator.Add(1, 3), Eclipse will tell you it doesn’t know what Operator is. Press Ctrl + Shift + O, it will automically import the needed namespace.