Alert Dialog in Android Kotlin?

What is Alert Dialog?

A dialog is a small window that prompts the user to make a decision or enter additional information. A dialog does not fill the screen and is normally used for modal events that require users to take an action before they can proceed.

Now we will create a success alert dialog.

Workflow

1. We have created a fun succeseAlertDialog() in a kt class file because if we want same dialog more than one place in a screen.
2. After we will set click event on a button and call the succeseAlertDialog() in its body.
3. Just run the code.

Let’s coding.

MainActivity.kt

class MainActivity: AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState) setContentView (R.layout.activity_main) btn_booking . setOnClickListener {
            val showAlertButton =findViewById<Button>(R.id.showAlertButton)
            showAlertButton.setOnClickListener {
                showBookingAlertSuccessfully()
            }
        }
    }

    private fun showBookingAlertSuccessfully() {
        val bookingAlert = AlertDialog.Builder(this)
        bookingAlert.setTitle("Booking Successfully.")
        bookingAlert.setMessage("Your Booking is completed. \nYour Servicing Date is 2020–12–29\n and Time is 15:58.\n\nFor any help please visit on help page.")
        bookingAlert.setIcon(R.drawable.type_success) bookingAlert . setPositiveButton ("Ok"){ dialog, id ->
            val intent = Intent(this, MyServicesActivity::class.java)
            startActivity(intent)
            finish()
        }
        val alertDialog = bookingAlert.create()
        alertDialog.setCanceledOnTouchOutside(false)
        alertDialog.show()
    }

}

Note; if you have to use the dialog in fragment then you have to use activity (this).

Customize Alert Dialog

For creating costume dialog, you can add a new .xml file, like bellow I am adding a send_feedback_layout.xml file to dialog.

val inflater = layoutInflater
val inflateView = inflater.inflate(R.layout.send_feedback_layout, null)
val feedbackRating = inflateView.findViewById<RatingBar>(R.id.feedback_ratingBar)
feedbackRating.rating = 5.0
// simply add this layout to alert dialog like this
alertDialog.setView(inflateView)

How to add alignment in alert dialog?

alert.window!!.setGravity(Gravity.BOTTOM)

It’s working proper.

Thank you, friends, for reading my article I hope it’s helpful for you.