Android Katha: onActivityResult is Deprecated. Now What?

Hi and welcome to my blog,

During our Android application development, we have been using startActivityForResult and onActivityResult methods a lot for the sake of callbacks from activities. It was really-clear and easy to implement. But Google knows.

Unfortunately, now we are getting a warning for this method in our code.

So the question is, Now What?

And the answer is: ActivityResultLauncher.

Pros:

1. We can now launch activities for the result from fragments and receive the results in fragments without going through the activity.
2. Instead of distinguishing requests with fallible INT codes we now have strongly typed classes.
3. We can have separate callbacks for separate requests, eliminating the need for switch-case in response handling.

onActivityResult(Kotlin):

fun openSecondActivityForResult() {
    val intent = Intent(this, SecondActivity::class.java)
    startActivityForResult(intent, REQUEST_CODE)
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)    
    
    if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_CODE) {
        // Do operations
    }
}

ActivityResultLauncher(Kotlin):

fun openSecondActivityForResult() {
    val intent = Intent(this, SecondActivity::class.java)
    activityResultLauncher.launch(intent)
}

// We can do the assignment inside onAttach or onCreate
var activityResultLauncher = registerForActivityResult(StartActivityForResult()) { result ->
    // There are no request codes

    if (result.resultCode == resultCode1 && result.data != null) {
        // Do operations
    } else if (result.resultCode == resultCode2) {
        // Do operations
    }
}

— — — — — — — — How to replace existing calls— — — — — — — —

Steps to replace old one with the new one (Kotlin):

1. In place of overridden method onActivityResult(…), use

// We can do the assignment inside onAttach or onCreate
var activityResultLauncher = registerForActivityResult(StartActivityForResult()) { result ->
    // There are no request codes    

    if (result.resultCode == resultCode1 && result.data != null) {
        // Do operations
    } else if (result.resultCode == resultCode2) {
        // Do operations
    }
}

     2. In place of startActivityForResult(intent, REQUEST_CODE), use

val intent: Intent = Intent(this, SecondActivity::class.java) 
activityResultLaunch.launch(intent)

     3. In SecondActivity.java class, while returning back to the source activity, code will remain the same like –

val intent = Intent()
setResult(FirstActivity.resultCode1, intent)
finish()

Please find the complete code with some demo screens on GitHub

Thanks for visiting, Keep reading & keep improving 🙂