Scienticious

okhttp3.Address: can't find referenced class javax.annotation.Nullable	
okhttp3.Authenticator: can't find referenced class javax.annotation.Nullable	
okhttp3.Authenticator$1: can't find referenced class javax.annotation.Nullable	
okhttp3.Cache: can't find referenced class javax.annotation.Nullable	
okhttp3.Cache$2: can't find referenced class javax.annotation.Nullable	
okhttp3.Cache$CacheResponseBody: can't find referenced class javax.annotation.Nullable	
okhttp3.Cache$Entry: can't find referenced class javax.annotation.Nullable	
okhttp3.CacheControl: can't find referenced class javax.annotation.Nullable	
okhttp3.CertificatePinner: can't find referenced class javax.annotation.Nullable	
okhttp3.Challenge: can't find referenced class javax.annotation.Nullable	

Scienticious

   
   try {
            PackageInfo info = getPackageManager().getPackageInfo(
                    getPackageName(),
                    PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }