Is proguard minifying my constants?

Issue

In a recent release of my App I added proguard. A weird error started to show up:

Fatal Exception: java.lang.NullPointerException
Attempt to invoke virtual method 'java.lang.String com.siplay.myapp.b.e.e.b()' on a null object reference

The error is being triggered in this line:

public boolean isVideo() {
    return Media.MEDIA_TYPE_VIDEO.equals(mImage.getType());
}

MEDIA_TYPE_VIDEO is a constant and is declared like this:

public class Media implements Parcelable {
    ...
    public static final String MEDIA_TYPE_VIDEO = "video";
    ...
    @Retention(RetentionPolicy.SOURCE)
    @StringDef({Media.MEDIA_TYPE_VIDEO, Media.MEDIA_TYPE_PHOTO, Media.MEDIA_TYPE_THUMB})
    public @interface MediaTypes {}
    ...
    public void setType(@MediaTypes String type) {
        ...
}

I read in many posts that Proguard doesn't mess with the constants declarations. However it must be the offuscated constant or the mImage object. The stacktrace tells me that this NPE is triggered right after I initialize the views:

public class MyFragment extends Fragment {
    ...
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if (savedInstanceState != null) {
            mImage = savedInstanceState.getParcelable(Constants.BUNDLE_IMAGE);
            ...
        }

        mVideoLoader.setVisibility(View.GONE);

        if (isVideo()) { //HERE
            ...
        }
        ...
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putParcelable(Constants.BUNDLE_IMAGE, mImage);
        ...
    }
}

Maybe this is happening because I hooked from onActivityCreated?

Solution

replace com.example with base package of Media Class and put this line in proguard file

-keep class com.example.** { *; }

Answered By - Aniruddh Parihar