public InboxStyle setSummaryText(CharSequence cs) {
            mSummaryText = Builder.limitCharSequenceLength(cs);
            mSummaryTextSet = true;
            return this;
        }
Set the first line of text after the detail section in the big form of the template.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java