The Quick and Easy Way to Create an Android Dialog

When coding and having own workflow, sometimes there is a need to display some information in a simple but clear and good way. Personally I think that dialog boxes are a clever way to to this – work every time and there is no any additional need to modify it. I decided to write this post be a quick tip for later development processes.

Below you can find a simple part of code for create and later display a dialog. If you have any question, leave a comment below. Enjoy!

The solution

// Prerequisite import and a package setup.
package com.sunnylib.secondapplication

import android.content.DialogInterface
import android.os.Bundle
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity

// The main Activity class
class MainActivity : AppCompatActivity() {

    // A function for building a dialog.
    // Accepts two strings: title and context message.
    // Returns a complex dialog object.
    private fun buildDialog(title: String, message: String): AlertDialog {
        val alertDialogBuilder = AlertDialog.Builder(this)
        alertDialogBuilder.setTitle(title)
        alertDialogBuilder.setMessage(message)
        alertDialogBuilder.setPositiveButton(R.string.ok, DialogInterface.OnClickListener { dialog, which -> dialog.cancel() })

        return alertDialogBuilder.create()
    }

    // Private function for displaying a previously built dialog.
    private fun displayValidationDialog() {
        val alertDialog = buildDialog(title = "R.string.warning", message = "R.string.all_fields_required")
        alertDialog.show()
    }

    // Basic activity class, runs as a first method on the activity launch.
    // For this example, the dialog displays immediately.
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        displayValidationDialog()

    }
}