CODEWITHSUNDEEP
javaandroidproguardandroid-proguard
Diffy
Diffy

Reputation: 2359

Prevent Proguard from stripping methods of an implemented interface

I am using an external library(Picasso) from Jcenter in my Android application. I am implementing an interface of that library in my app. The problem is that proguard always strips the methods of the implemented interface in my app.

The interface defined in the external library is 

public interface Callback {
  void onSuccess();

  void onError();
}

And i implement this interface in my code. When i run proguard and check my .class files, i find that there are no onSuccess and onError methods in my implemented class.

I have already added the configurations to skip all that external library completely in my proguard file by adding this

-keep class com.squareup.picasso.** {*;}
-dontwarn com.squareup.picasso.**

One way of preventing the above stripping is that i do this, where PicassoCallback is my implementation of Callback interface

-keep class com.package.className$PicassoCallback{
    public void onSuccess();
    public void onError();
}

But then i will have to do this for every implementation of the external interface in my project.

Any proguard configuration that can help me to prevent stripping the methods throughout my project?

Upvotes: 0

Views: 2202

Answers (2)

Mike Laren
Mike Laren

Reputation: 8188

You can configure ProGuard to keep all classes that implement the Callback interface using this rule:

-keep class ** implements com.squareup.picasso.Callback { *; }

Another way is to add the @Keep annotation to all of you callbacks, which basically tells ProGuard to not strip/modify them in any way.

Upvotes: 3

Santiago Franco
Santiago Franco

Reputation: 1

Just add this line:

    -keep interface com.squareup.picasso.** { *; }

after this one:

    -keep class com.squareup.picasso.** {*;}

I use several squareup libs so I have the next configuration in my project:

    -keep class com.squareup.** { *; }
    -keep interface com.squareup.** { *; }

EDIT: Some useful examples: https://www.guardsquare.com/en/proguard/manual/examples

Upvotes: 0

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