VancedMicroG/play-services-core/src/main/java/org/microg/gms/common/StatusNotification.java

package org.microg.gms.common;

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.PowerManager;
import android.provider.Settings;

import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;

import com.mgoogle.android.gms.R;

public class StatusNotification {

    private static int notificationID;
    private static boolean notificationExists = false;

    public static boolean Notify(Context context) {
        PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && NotificationManagerCompat.from(context).areNotificationsEnabled()) {
            if (!powerManager.isIgnoringBatteryOptimizations(context.getPackageName())) {
                if (notificationExists) {
                    return false;
                }

                buildStatusNotification(context);
            } else {
                if (notificationExists) {
                    ((NotificationManager)
                            context.getSystemService(Context.NOTIFICATION_SERVICE)).cancel(notificationID);
                    notificationExists = false;
                }
            }
        }
        return false;
    }

    private static void buildStatusNotification(Context context) {
        notificationID = 1;

        Intent intent = new Intent();
        intent.setAction(Settings.ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

        String notificationChannelID = "foreground-service";

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(notificationChannelID,
                    context.getResources().getString(R.string.notification_service_name),
                    NotificationManager.IMPORTANCE_LOW);
            channel.setShowBadge(true);
            channel.setLockscreenVisibility(0);
            channel.setVibrationPattern(new long[0]);
            context.getSystemService(NotificationManager.class).createNotificationChannel(channel);
        }
        NotificationCompat.Builder notification = new NotificationCompat.Builder(context, notificationChannelID)
                .setOngoing(true)
                .setContentIntent(pendingIntent)
                .setSmallIcon(R.drawable.ic_foreground_notification)
                .setSubText(context.getResources().getString(R.string.notification_service_title))
                .setContentTitle(context.getResources().getString(R.string.notification_service_content))
                .setContentText(context.getResources().getString(R.string.notification_service_subcontent));

        NotificationManager manager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

        manager.notify(notificationID, notification.build());

        notificationExists = true;
    }
}