public Builder setLatestTimestamp(long timestamp) {
                    mLatestTimestamp = timestamp;
                    return this;
                }
Sets the timestamp of the most recent message in an unread conversation.
<p>
If a messaging notification has been posted by your application and has not
yet been cancelled, posting a later notification with the same id and tag
but without a newer timestamp may result in Android Auto not displaying a
heads up notification for the later notification.

@param timestamp The timestamp of the most recent message in the conversation.
@return This object for method chaining.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java