foreground service android example

different files

MainActivity.java:

package com.sunmeat.services;

import android.app.ActivityManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_POST_NOTIFICATIONS_PERMISSION = 1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        checkNotificationsPermission();
    }

    // проверка и запрос разрешения на показ уведомлений
    private void checkNotificationsPermission() {
        if (isNotificationsPermissionGranted()) {
            showToast("notification permission granted");
        } else {
            requestNotificationsPermission();
        }
    }

    // проверка, предоставлено ли разрешение на показ уведомлений
    private boolean isNotificationsPermissionGranted() {
        return ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS)
                == PackageManager.PERMISSION_GRANTED;
    }

    // запрос разрешения на показ уведомлений
    private void requestNotificationsPermission() {
        ActivityCompat.requestPermissions(
                this, new String[]{Manifest.permission.POST_NOTIFICATIONS},
                REQUEST_POST_NOTIFICATIONS_PERMISSION);
    }

    // обработка результата запроса разрешения на показ уведомлений
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == REQUEST_POST_NOTIFICATIONS_PERMISSION) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                showToast("notification permission granted");
            } else {
                showToast("notification permission denied");
            }
        }
    }

    // вывод тоста
    private void showToast(String message) {
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
    }

    public void start(View v) {
        if (isServiceRunning(MyService.class)) return;
        Intent i = new Intent(this, MyService.class);
        i.setAction("start");
        ContextCompat.startForegroundService(this, i);
    }

    public void stop(View v) {
        if (!isServiceRunning(MyService.class)) return;
        Intent i = new Intent(this, MyService.class);
        i.setAction("stop");
        startService(i); // для остановки можно оставить startService, он передаст intent в onStartCommand
    }

    // проверка, запущен ли сервис
    private boolean isServiceRunning(Class<?> serviceClass) {
        ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
            if (serviceClass.getName().equals(service.service.getClassName())) {
                return true;
            }
        }
        return false;
    }

    // альтернативный вариант, но не рабочий :)
    public static boolean isServiceRunning(Context context, Class<?> serviceClass) {
        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

        if (manager != null) {
            for (ActivityManager.RunningAppProcessInfo processInfo : manager.getRunningAppProcesses()) {
                if (processInfo.processName.equals(context.getPackageName())) {
                    for (String service : processInfo.pkgList) {
                        if (service.equals(serviceClass.getName())) {
                            return true;
                        }
                    }
                }
            }
        }

        return false;
    }
}

================================================================================================================

MyService.java:

package com.sunmeat.services;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import androidx.core.app.NotificationCompat;

public class MyService extends Service {

    private Handler h;
    private Runnable r;

    int counter = 0;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    private Notification updateNotification() {

        counter++;
        String info = counter + "";

        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        NotificationCompat.Builder builder;

        Context context = getApplicationContext();

        createNotificationChannel(manager);
        builder = new NotificationCompat.Builder(this, CHANNEL_ID);

        PendingIntent action = PendingIntent.getActivity(context, 0, new Intent(context, MainActivity.class), PendingIntent.FLAG_IMMUTABLE);

        // настройка параметров уведомления
        builder.setContentIntent(action)
                .setContentTitle(info)
                .setTicker(info)
                .setContentText(info)
                .setSmallIcon(R.drawable.barcode)
                .setOngoing(true)
                .build();

        // создание и отправка уведомления
        Notification notification = builder.build();
        // long notificationCode = System.currentTimeMillis(); // будет генерироваться отдельная строка для каждого уведомления
        long notificationCode = 2025; // решил обновлять одно и то же уведомление
        manager.notify((int) notificationCode, notification);

        return notification;
    }

    // cоздание канала уведомлений
    private static final String CHANNEL_ID = "alex_channel";

    private void createNotificationChannel(NotificationManager manager) {
        if (manager.getNotificationChannel(CHANNEL_ID) == null) {
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, "AlexChannel", NotificationManager.IMPORTANCE_HIGH);
            channel.setDescription("My notification channel description");
            manager.createNotificationChannel(channel);
        }
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (intent != null && intent.getAction() != null && intent.getAction().contains("start")) {
            startForeground(101, updateNotification());

            h = new Handler();
            r = new Runnable() {
                @Override
                public void run() {
                    updateNotification();
                    h.postDelayed(this, 1000);
                }
            };
            h.post(r);
        } else if (intent != null && intent.getAction() != null && intent.getAction().contains("stop")) {
            if (h != null && r != null) {
                h.removeCallbacks(r);
            }
            stopForeground(true);
            stopSelf();
        }
        return Service.START_STICKY;
    }
}

==================================================================================================================

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <Button
        android:id="@+id/start"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:background="#00AA00"
        android:onClick="start"
        android:text="Запустить сервис!"
        android:textAllCaps="false" />

    <Button
        android:id="@+id/stop"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:background="#AA0000"
        android:onClick="stop"
        android:text="Остановить сервис!"
        android:textAllCaps="false" />
</LinearLayout>

===================================================================================================================

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.App1"
        tools:targetApi="31">
        <service
            android:name=".MyService"
            android:enabled="true"
            android:exported="false"
            android:foregroundServiceType="location|dataSync|mediaPlayback"
            tools:ignore="ForegroundServicePermission" />

        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Oleksandr,

Hi. This example is very clear and useful. Thank you for posting.

Dave Carlson
Valencia, Ca. USA

I built this code as an app and run it, it stopped after 12 hours off works.

if i press button named Clear all in recent app the service is die

great sample
thanks

You missed: AndroidManifest.xml:
<service android:enabled="true" android:name="com.alex.services.MyService"></service>