How to run Background Service in Android Studio using Kotlin.

Last updated Dec 18, 2021


In this android example, we will see how to run a Background Service in Android Studio by using Kotlin Language.

Implementation:
 

Step 1: Create a new Project in android studio.

Go to File > New > New Project > Empty Activity > Next > Enter Name > Select Language Kotlin > Finish

 

Step 2: Go to activity_main.xml file and add the following code

  <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:text="RRTUTORS"
        android:textAlignment="center"
         android:textColor="@color/purple_500"
        android:textSize="32sp"
        android:textStyle="bold" />
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Start Background Service"
        android:textSize="16sp"
        android:textStyle="bold" />
</RelativeLayout>

 

Step 3: Create a new kotlin file.

app > new > Kotlin File(Class) > Enter Name(MyService) > Enter

 

Step 4: Open MyService.kt file and add the following code.

class MyService : Service() {
    override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
        onTaskRemoved(intent)
        Toast.makeText(
            applicationContext, "This is a Service running in Background",
            Toast.LENGTH_SHORT
        ).show()
        return START_STICKY
    }
    override fun onBind(intent: Intent): IBinder? {
        // TODO: Return the communication channel to the service.
        throw UnsupportedOperationException("Not yet implemented")
    }
    override fun onTaskRemoved(rootIntent: Intent) {
        val restartServiceIntent = Intent(applicationContext, this.javaClass)
        restartServiceIntent.setPackage(packageName)
        startService(restartServiceIntent)
        super.onTaskRemoved(rootIntent)
    }
}

 

Step 5: Add following code in AndroidManifest.xml file inside tag.

          <service
            android:name=".MyService"
            android:enabled="true"
            android:exported="true" />

 

Step 6: Open MainActivity.kt file and add the following code below setContentView(R.layout.activity_main).

 val button: Button = findViewById(R.id.button)
        button.setOnClickListener {
            startService(Intent(applicationContext, MyService::class.java))

 

Step 7: Run the app on emulator or real device, you will get the output as following in video 
 

Complete Source Code of Run Background Service Example 
 

activity_main.xml file


  <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:text="RRTUTORS"
        android:textAlignment="center"
         android:textColor="@color/purple_500"
        android:textSize="32sp"
        android:textStyle="bold" />
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Start Background Service"
        android:textSize="16sp"
        android:textStyle="bold" />
</RelativeLayout>

 

MainActivity.kt file

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button

class ServiceActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val button: Button = findViewById(R.id.button)
        button.setOnClickListener {
            startService(Intent(applicationContext, MyService::class.java)) }

    }
}

 

MyService.kt file

import android.app.Service
import android.content.Intent
import android.os.IBinder
import android.widget.Toast

class MyService : Service() {
    override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
        onTaskRemoved(intent)
        Toast.makeText(
            applicationContext, "This is a Service running in Background",
            Toast.LENGTH_SHORT
        ).show()
        return START_STICKY
    }
    override fun onBind(intent: Intent): IBinder? {
        // TODO: Return the communication channel to the service.
        throw UnsupportedOperationException("Not yet implemented")
    }
    override fun onTaskRemoved(rootIntent: Intent) {
        val restartServiceIntent = Intent(applicationContext, this.javaClass)
        restartServiceIntent.setPackage(packageName)
        startService(restartServiceIntent)
        super.onTaskRemoved(rootIntent)
    }
}

 

Conclusion: In this android example we have covered how to run a background service in Android Studio by using Kotlin Language.


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