Whats the alternative of deprecated onBackPressed().md

onBackPressed deprecated.

Problem

onBackPressed() is now deprecated on API level 33+

How you fix it

Alternatively, you can use: OnBackPressedDispatcher.
So I have made a simple extension that will let you still use onBackPressed keyword and you will not miss it anymore.
I hope they will help you implement your menu in the new way, easily and clearly,that will help you not repeat a huge code

Solution

Before we start, let’s talk about why there is such a change. You may know that starting from Android 10 the system provide gesture navigation feature.
In a bit more detail, the system supports gestures like swiping left to right to navigate back ( just like IOS devices ).
But this has led unexpected behaviour when it has been combined with horizontal swipes in applications.
The users reported that they sometimes trigger system back while swiping horizontally in an application.
The problem is that the android system cannot differentiate if the gesture is for system back or for application back navigation.
In other words, It cannot tell if the application handles the gesture.

Step 1

Add dependencies in build.gradle(app level)

Make sure you have at least 'androidx.activity:activity-ktx:1.6.0-rc01' at your dependencies in Case of Activity Extention 
Otherwise 'androidx.activity:activity-ktx:1.0.0' is must for Fragment Only 

implementation 'androidx.activity:activity-ktx:1.6.0-rc01'

Step 2

create extension functions and implementation into your activity or fragment

Activity Extension

  fun AppCompatActivity.onBackPressed(isEnabled: Boolean, callback: () -> Unit) {
    onBackPressedDispatcher.addCallback(this,
        object : OnBackPressedCallback(isEnabled) {
            override fun handleOnBackPressed() {
                callback()
            }
        })
}

Usage in Activity

 class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        
    	onBackPressed(true) {
		  // do what do you want when get back 
        }
    }

}

Fragment Extension

 fun FragmentActivity.onBackPressed(callback: () -> Unit) {
    onBackPressedDispatcher.addCallback(this,
     //default value is True 
        object : OnBackPressedCallback(true) {
            override fun handleOnBackPressed() {
                callback()
            }
        }
 	)
}

Usage in Fragment

 class HomeFragment : Fragment() {
  
   override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
		    requireActivity().onBackPressed {        
		  // do what do you want when get back 
		}
  }
}