Question

Source example:

// this is package visible interface
interface MyInterface {
    void foo();
}

public class MyClass1 implements MyInterface {
    // some public class members which should not be obfuscated
    // ...     

    // this is MyInterface implementation, this method should be obfuscated:
    void foo() {}
}

// other classes which implement MyInterface
...

How do I keep all public members in MyClass1 and in other classes while only obfuscating MyInterface.foo() implementations.

Answer 1

ProGuard doesn’t provide any shortcuts to specify all methods but one. You’ll have to specify the ones you need. Presumably, there is a reason why you have to keep them. For instance, if they implement another interface, you can easily specify to keep all the methods of this other interface.

Note that -keep specifications refer to the names of the classes/fields/methods, not to the code of the methods:

ProGuard manual > Usage > Overview of -keep options