Sample of dialog listener unbinding when device configuration has changed (e.g, dark theme, language, screen orientation)

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/buttonShowDialog"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show Dialog" />


    <TextView
        android:id="@+id/textViewDialogAction"
        style="@style/TextAppearance.AppCompat.Title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        tools:text="Dialog result" />

</LinearLayout>

build.gradle

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
}

android {
    namespace 'com.lmwn.poc.dialogwithconfigchanges'
    compileSdk 32

    defaultConfig {
        applicationId "com.lmwn.poc.dialogwithconfigchanges"
        minSdk 23
        targetSdk 32
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
    buildFeatures {
        viewBinding true
    }
}

dependencies {
    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.5.1'
    implementation 'com.google.android.material:material:1.7.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.4'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.0'
}

MainActivity.kt

package com.lmwn.poc.dialogwithconfigchanges

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.DialogFragment
import com.lmwn.poc.dialogwithconfigchanges.databinding.ActivityMainBinding
import com.lmwn.poc.dialogwithconfigchanges.databinding.ViewAwesomeDialogBinding

class MainActivity : AppCompatActivity() {
    private val binding: ActivityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(binding.root)

        binding.buttonShowDialog.setOnClickListener {
            AwesomeDialog.Builder()
                .setTitle("Hello World")
                .setOnPositiveClick {
                    binding.textViewDialogAction.text = "Positive"
                }
                .setOnNegativeClick {
                    binding.textViewDialogAction.text = "Negative"
                }
                .build()
                .show(supportFragmentManager, null)
        }
    }
}

class AwesomeDialog : DialogFragment() {
    companion object {
        private const val EXTRA_TITLE = "extra_title"
    }

    private lateinit var binding: ViewAwesomeDialogBinding

    private var onPositiveClick: (() -> Unit)? = null
    private var onNegativeClick: (() -> Unit)? = null

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        binding.textViewTitle.text = arguments?.getString(EXTRA_TITLE)
        binding.buttonPositive.setOnClickListener {
            onPositiveClick?.invoke()
            dismiss()
        }
        binding.buttonNegative.setOnClickListener {
            onNegativeClick?.invoke()
            dismiss()
        }
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
        binding = ViewAwesomeDialogBinding.inflate(inflater, container, false)
        return binding.root
    }

    fun setOnPositiveClick(action: (() -> Unit)?) {
        this.onPositiveClick = action
    }

    fun setOnNegativeClick(action: (() -> Unit)?) {
        this.onNegativeClick = action
    }

    class Builder {
        private var title: String? = null
        private var onPositiveClick: (() -> Unit)? = null
        private var onNegativeClick: (() -> Unit)? = null

        fun setTitle(title: String) = this.apply {
            this.title = title
        }

        fun setOnPositiveClick(action: () -> Unit) = this.apply {
            this.onPositiveClick = action
        }

        fun setOnNegativeClick(action: () -> Unit) = this.apply {
            this.onNegativeClick = action
        }

        fun build() = AwesomeDialog().apply {
            arguments = Bundle().apply {
                this.putString(EXTRA_TITLE, [email protected])
            }
            [email protected]([email protected])
            [email protected]([email protected])
        }
    }
}

view_awesome_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="32dp"
    tools:context=".MainActivity">

    <TextView
        style="@style/TextAppearance.AppCompat.Title"
        android:id="@+id/textViewTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:text="Title" />

    <Button
        android:id="@+id/buttonPositive"
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="OK" />

    <Button
        android:id="@+id/buttonNegative"
        android:layout_width="120dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:text="Cancel" />

</LinearLayout>