How to detect user inactivity for 5 seconds in Android using Kotlin?

This example demonstrates how to detect user inactivity for 5 seconds in Android using Kotlin.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

Step 3 − Add the following code to src/MainActivity.kt

import android.os.Bundle
import android.os.Handler
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
   lateinit var handler: Handler
   lateinit var runnable: Runnable
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      handler = Handler()
      runnable = Runnable { // TODO Auto-generated method stub
         Toast.makeText(this@MainActivity, "user is inactive from last 5 seconds", Toast.LENGTH_SHORT).show()
      }
      startHandler()
   }
   override fun onUserInteraction() {
      // TODO Auto-generated method stub
      super.onUserInteraction()
      stopHandler()
      startHandler()
   }
   private fun stopHandler() {
      handler.removeCallbacks(runnable)
   }
   private fun startHandler() {
      handler.postDelayed(runnable, 5000.toLong())
   }
}

Step 4 − Add the following code to androidManifest.xml

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen.