Hide the implementation while developing SDK

Question

I am developing one SDK in Android and all good. But I got stuck in a point, How can I hide the implementation from the user. For example, if I am exposing a method calcualteSum() to user shouldn't be able to see the operations happening in the background. Please refer the below code. This is currently I'm hiding the operation from the user. Is there any better way to do this?

public class MathCalulate {
    
    //user will be able to access this method.
    public int calculateSum(int a, int b){
        return MyMath.sum(a,b);
    }

}

Implementation class which will be hidden from the customer:

private class MyMath {

    //user will not be able to access this method.
    private int sum(int a, int b){
        return  a+b;
    }

}

varijkapil13 · Accepted Answer · 2020-07-06 10:33:12Z

2

You can provide an interface for your function and provide a package private default implementation for that.

example:

public interface MathCalculate {
   int calculateSum(int a, int b);
}

and its implementation:

class MathCalcualteImpl implements MathCalculate {

 @Override
 public int calculateSum(int a, int b){
   return a+b;
 }
}

this way, the users who access your library, will/can import MathCalculate and just use the functions you have provided in the interface.

But be careful, the users can also override their functionality, and provide their own implementation for your interface.

answered Jul 6, 2020 at 10:33

varijkapil13

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Comments

Navinpd · Accepted Answer · 2020-07-07 01:47:11Z

0

On top of above @Kapil answer you need to obfuscate your classes using dexguard / proguard /R8. This will make it hard for developers to understand your code.

answered Jul 7, 2020 at 1:47

Navinpd

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2 Comments

Manu Ram V Over a year ago

Of course, we are using pro-guard. But you know right if we are applying proguard to the user exposed methods/class they can't access it properly.

Navinpd Over a year ago

Yes.. For sure. So do not obfuscate these interface classes. As below: -keep class <Fully Qualified ClassName>

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