Remove useless import and add some comments

import android.text.format.DateUtils;

import android.text.style.BackgroundColorSpan;

import android.text.style.ForegroundColorSpan;

import android.util.Log;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

    private DBNote colorTheNote(DBNote dbNote) {

        if (!TextUtils.isEmpty(searchQuery)) {

            SpannableString spannableString = new SpannableString(dbNote.getTitle());

            // The Pattern.quote method will add \Q to the very beginning of the string and \E to the end of the string

            // It implies that the string between \Q and \E is a literal string and thus the reserved keyword in such string will be ignored.

            // See https://stackoverflow.com/questions/15409296/what-is-the-use-of-pattern-quote-method

            Matcher matcher = Pattern.compile("(" + Pattern.quote(searchQuery.toString()) + ")", Pattern.CASE_INSENSITIVE).matcher(spannableString);

            while (matcher.find()) {

                spannableString.setSpan(new ForegroundColorSpan(searchForeground), matcher.start(), matcher.end(), 0);