Android Service Example

1/ Step : Create A New class  MyService .

import android.annotation.SuppressLint
import android.app.Notification
import android.app.NotificationChannel
import android.app.NotificationManager
import android.app.Service
import android.content.Intent
import android.os.IBinder
import android.os.SystemClock
import androidx.core.app.NotificationCompat

class MyService : Service() {

    private var isRunning = false
    private var startTime: Long = 0

    override fun onBind(intent: Intent?): IBinder? {
        
        return null
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        if (!isRunning) {
            isRunning = true
            startTime = SystemClock.elapsedRealtime()

         
            startForegroundService()

          
            Thread {
                while (isRunning) {
                    val elapsedTime = SystemClock.elapsedRealtime() - startTime
                    println("Service is running: ${elapsedTime / 1000} seconds")
                    SystemClock.sleep(1000) 
                }
            }.start()
        }

        return START_STICKY
    }

    override fun onDestroy() {
        super.onDestroy()
        isRunning = false
        println("Service Stopped")
    }

    @SuppressLint("ForegroundServiceType")
    private fun startForegroundService() {
        val channelId = "MyServiceChannel"
        val channelName = "My Background Service"
        val notificationManager = getSystemService(NotificationManager::class.java)

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            val channel = NotificationChannel(
                channelId,
                channelName,
                NotificationManager.IMPORTANCE_LOW
            )
            notificationManager?.createNotificationChannel(channel)
        }

        val notification: Notification = NotificationCompat.Builder(this, channelId)
            .setContentTitle("My Service is Running")
            .setContentText("Performing background tasks...")
            .setSmallIcon(android.R.drawable.ic_notification_overlay)
            .build()

        startForeground(1, notification)
    }
}

2/Spep :  AndroidManifest.xml  add the code

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

    <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.MyApplication"
        tools:targetApi="31">

        <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>
        //////////////////////////////////////////////////////
        
        <service
            android:name="MyService"
            android:enabled="true"
            android:exported="false"
            tools:ignore="MissingClass" />
        
        ///////////////////////////////////////////////////////////
    </application>

</manifest>

3/Step :  Add the code MainActivity .

package com.alomkaisa.myapplication

import MyService
import android.content.Intent
import android.os.Bundle
import android.widget.Button
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat

class MainActivity : AppCompatActivity() {

    private lateinit var startServiceButton: Button
    private lateinit var stopServiceButton: Button

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        startServiceButton = findViewById(R.id.startServiceButton)
        stopServiceButton = findViewById(R.id.stopServiceButton)

        val serviceIntent = Intent(this, MyService::class.java)

        startServiceButton.setOnClickListener {
            startService(serviceIntent) // Start Service
        }

        stopServiceButton.setOnClickListener {
            stopService(serviceIntent) // Stop Service
        }
    }
}

4/Spep :  Add the code  Activity_main.xml

     <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#BECDDC39"
    android:padding="16dp">

    <Button
        android:layout_marginTop="100dp"
        android:id="@+id/startServiceButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:text="Start Service" />

    <Button
        android:layout_marginTop="30dp"
        android:id="@+id/stopServiceButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:text="Stop Service"
        />
</LinearLayout>