In this tutorial am showing you how to create an input dialog in kotlin android. The dialog will have these components:

1. Title
2. Message/Description
3. EditText for input
4. Two buttons: Positive and Negative

Here is the function:

import android.app.AlertDialog
import android.content.Context
import android.widget.EditText

fun showInputDialog(context: Context, title: String, message: String, positiveButtonText: String, negativeButtonText: String,
                    positiveButtonClickListener: (String) -> Unit, negativeButtonClickListener: () -> Unit) {

    val builder = AlertDialog.Builder(context)
    builder.setTitle(title)
    builder.setMessage(message)

    // Set up the input field
    val input = EditText(context)
    builder.setView(input)

    // Set up the buttons
    builder.setPositiveButton(positiveButtonText) { _, _ ->
        val text = input.text.toString()
        positiveButtonClickListener(text)
    }
    builder.setNegativeButton(negativeButtonText) { _, _ ->
        negativeButtonClickListener()
    }

    // Create and show the AlertDialog
    builder.show()
}

1. Function Definition:

• showInputDialog takes the following arguments:
  • context: The context of the activity.
  • title: The title of the dialog.
  • message: The message to display in the dialog.
  • positiveButtonText: The text for the positive button.
  • negativeButtonText: The text for the negative button.
  • positiveButtonClickListener: A lambda function to be executed when the positive button is clicked. It takes the input text as an argument.
  • negativeButtonClickListener: A lambda function to be executed when the negative button is clicked.

1. AlertDialog Builder:

• AlertDialog.Builder(context) creates an AlertDialog builder.

1. Setting Title and Message:

• builder.setTitle(title) sets the dialog title.
• builder.setMessage(message) sets the dialog message.

1. Input Field:

• val input = EditText(context) creates an EditText view.
• builder.setView(input) adds the EditText to the dialog layout.

1. Buttons:

• builder.setPositiveButton(...) sets the positive button:

  • The first argument is the button text.
  • The second argument is a listener that gets called when the button is clicked. It takes the dialog and which button was clicked (unused here).
  • Inside the listener:
  • val text = input.text.toString() gets the text from the input field.
  • positiveButtonClickListener(text) calls the provided lambda function, passing the input text.

• builder.setNegativeButton(...) sets the negative button in a similar way, calling negativeButtonClickListener().

1. Show Dialog:

• builder.show() creates and shows the AlertDialog.

How to Use:

// In your activity or fragment
showInputDialog(this, "Input Title", "Enter your text:", "OK", "Cancel",
    { text ->
        // Handle positive button click with the input text
        Toast.makeText(this, "You entered: $text", Toast.LENGTH_SHORT).show()
    },
    {
        // Handle negative button click
        Toast.makeText(this, "Canceled", Toast.LENGTH_SHORT).show()
    }
)

This will display an input dialog with the title "Input Title", message "Enter your text:", and two buttons "OK" and "Cancel". When "OK" is clicked, the entered text will be displayed in a Toast. When "Cancel" is clicked, a "Canceled" Toast will be shown.