public Builder setSubText(CharSequence text) {
            mSubText = limitCharSequenceLength(text);
            return this;
        }
Set the third line of text in the platform notification template.
Don't use if you're also using {@link #setProgress(int, int, boolean)};
they occupy the same location in the standard template.
<br>
If the platform does not provide large-format notifications, this method has no effect.
The third line of text only appears in expanded view.
<br>
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java