public Builder addExtras(Bundle extras) {
                if (extras != null) {
                    mExtras.putAll(extras);
                }
                return this;
            }
Merge additional metadata into this builder.

<p>Values within the Bundle will replace existing extras values in this Builder.

@see NotificationCompat.Action#getExtras
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java