Skip to content
Related Articles

Related Articles

Improve Article
Save Article
Like Article

How to Detect User Inactivity in Android?

  • Last Updated : 11 Aug, 2021

It is important to detect user inactivity in applications that display or contain private credentials, such as social apps, banking apps, wallet apps, etc. In such applications, there is a login session that authenticates log-in credentials. Once the session starts, the user can perform desired actions. However, if the screen is unused for a long time, it is necessary for the application to start displaying alerts or log the user out of the current session, user inactivity being the grounds for logging out. So, there must have been a timer or counter running in the background, that counted the user inactivity for some specified time.

Want a more fast-paced & competitive environment to learn the fundamentals of Android?
Click here to head to a guide uniquely curated by our experts with the aim to make you industry ready in no time!

So, through this article, we will show you how you could detect user inactivity by knowing when the user last touched the screen and instantly starting a counter for a specific time.

Step by Step Implementation

Step 1: Create a New Project in Android Studio



To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. We demonstrated the application in Kotlin, so make sure you select Kotlin as the primary language while creating a New Project.

Step 2: Working with the activity_main.xml file

Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file. Change the background of the layout to a darker color. We changed the background to black as we wanted to show touch impressions on the screen.

XML




<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/black"
    tools:context=".MainActivity">
</RelativeLayout>

Step 3: Working with the MainActivity.kt file

Go to the MainActivity.kt file and refer to the following code. Below is the code for the MainActivity.kt file. Comments are added inside the code to understand the code in more detail.

Kotlin




import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.Handler
import android.os.Looper
import android.view.MotionEvent
import android.widget.Button
import android.widget.EditText
import android.widget.Toast
  
class MainActivity : AppCompatActivity() {
  
    // Declaring handler, runnable and time in milli seconds
    private lateinit var mHandler: Handler
    private lateinit var mRunnable: Runnable
    private var mTime: Long = 2000
  
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
  
        // Initializing the handler and the runnable
        mHandler = Handler(Looper.getMainLooper())
        mRunnable = Runnable {
            Toast.makeText(applicationContext, "User inactive for ${mTime/1000} secs!", Toast.LENGTH_SHORT).show()
        }
  
        // Start the handler
        startHandler()
    }
  
    // When the screen is touched or motion is detected
    override fun onTouchEvent(event: MotionEvent?): Boolean {
  
        // Removes the handler callbacks (if any)
        stopHandler()
  
        // Runs the handler (for the specified time)
        // If any touch or motion is detected before 
        // the specified time, this override function is again called
        startHandler()
  
        return super.onTouchEvent(event)
    }
  
    // start handler function
    private fun startHandler(){
        mHandler.postDelayed(mRunnable, mTime)
    }
  
    // stop handler function
    private fun stopHandler(){
        mHandler.removeCallbacks(mRunnable)
    }
}

Output:

You can see that if the screen is untouched for 2 seconds, the application displays a message regarding user inactivity.




My Personal Notes arrow_drop_up
Recommended Articles
Page :

Start Your Coding Journey Now!