Observe settings directly in ColorDisplayService

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.time.DateTimeException;

import java.time.Instant;

import java.time.LocalDateTime;

import java.time.LocalTime;

import java.time.ZoneId;

import java.time.format.DateTimeParseException;

/**

 * Controller for managing night display and color mode settings.

                Secure.NIGHT_DISPLAY_ACTIVATED, activated ? 1 : 0, mUserId);

    }

    /**

     * Returns the time when Night display's activation state last changed, or {@code null} if it

     * has never been changed.

     */

    public LocalDateTime getLastActivatedTime() {

        final ContentResolver cr = mContext.getContentResolver();

        final String lastActivatedTime = Secure.getStringForUser(

                cr, Secure.NIGHT_DISPLAY_LAST_ACTIVATED_TIME, mUserId);

        if (lastActivatedTime != null) {

            try {

                return LocalDateTime.parse(lastActivatedTime);

            } catch (DateTimeParseException ignored) {}

            // Uses the old epoch time.

            try {

                return LocalDateTime.ofInstant(

                    Instant.ofEpochMilli(Long.parseLong(lastActivatedTime)),

                    ZoneId.systemDefault());

            } catch (DateTimeException|NumberFormatException ignored) {}

        }

        return null;

    }

    /**

     * Returns the current auto mode value controlling when Night display will be automatically

     * activated. One of {@link #AUTO_MODE_DISABLED}, {@link #AUTO_MODE_CUSTOM}, or