public Builder addMessage(String message) {
                    mMessages.add(message);
                    return this;
                }
Appends a new unread message to the list of messages for this conversation.
<p>
The messages should be added from oldest to newest.

@param message The text of the new unread message.
@return This object for method chaining.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java