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public class Constants {
    public static final String PACKAGE_NAME = BuildConfig.APPLICATION_ID;
    public static final Integer VERSION_CODE = BuildConfig.VERSION_CODE;
    public static final String NOW_PLAYING_PACKAGE_NAME = "com.google.intelligence.sense";
    public static final String DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ssZ";
}

Set<String> EnabledListenerPackagesSet = NotificationManagerCompat.getEnabledListenerPackages(this);

        if(EnabledListenerPackagesSet == null || !EnabledListenerPackagesSet.contains(Constants.PACKAGE_NAME)) {
            startActivity(new Intent("android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS"));
        }