bottom sheet alert dialog

dialog_view.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingHorizontal="@dimen/dialog_padding"
    android:paddingVertical="@dimen/activity_default_padding">

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.05" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.95" />

    <LinearLayout
        android:id="@+id/title_wrapper"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/activity_small_padding"
        android:gravity="center"
        android:orientation="horizontal"
        app:layout_constrainedWidth="true"
        app:layout_constraintEnd_toStartOf="@id/guideline2"
        app:layout_constraintStart_toStartOf="@id/guideline"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.appcompat.widget.AppCompatImageView
            android:id="@+id/icon"
            android:layout_width="@dimen/dialog_icon_size"
            android:layout_height="@dimen/dialog_icon_size"
            android:layout_marginEnd="@dimen/activity_small_padding_half" />

        <androidx.appcompat.widget.AppCompatTextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:text="Title"
            android:textAppearance="@style/TextAppearance.AppCompat.Headline" />
    </LinearLayout>

    <androidx.appcompat.widget.AppCompatTextView
        android:id="@+id/message"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginVertical="@dimen/activity_default_padding"
        android:gravity="center_horizontal"
        android:text="Message"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        app:fontFamily="sans-serif-light"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/title_wrapper" />


    <com.google.android.material.button.MaterialButton
        android:id="@+id/positive"
        style="@style/DialogButton"
        android:layout_width="@dimen/dialog_button_width"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/activity_default_padding"
        android:text="Positive"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/message" />

    <com.google.android.material.button.MaterialButton
        android:id="@+id/negative"
        style="@style/Widget.MaterialComponents.Button.TextButton"
        android:layout_width="@dimen/dialog_button_width"
        android:layout_height="wrap_content"
        android:minHeight="@dimen/dialog_button_negative_height"
        android:text="Negative"
        android:textAllCaps="false"
        android:textColor="?colorOnBackground"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/positive"
        app:rippleColor="?colorOnBackground" />
</androidx.constraintlayout.widget.ConstraintLayout>

dialog_view_theme.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="DialogButton" parent="Widget.MaterialComponents.Button">
        <item name="backgroundTint">@color/dialog_background</item>
        <item name="android:textColor">?colorOnBackground</item>
        <item name="rippleColor">?rippleColor</item>
        <item name="strokeColor">?colorOnBackground</item>
        <item name="minHeight">@dimen/dialog_button_height</item>
        <item name="android:minHeight">@dimen/dialog_button_height</item>
        <item name="cornerRadius">@dimen/dialog_positive_button_radius</item>
        <item name="strokeWidth">2dp</item>
        <item name="textAllCaps">false</item>
        <item name="android:stateListAnimator">@animator/button_press_animation</item>
        <item name="android:elevation">4dp</item>
    </style>
</resources>

DialogView.kt

class DialogView : BottomSheetDialogFragment() {
    private lateinit var binder: DialogViewBinding
    private var icon: Drawable? = null
    private var negativeText: String? = null
    private var negativeListener: Listener? = null
    private lateinit var title: String
    private var content: String? = null
    private var positiveText: String? = null
    private var positiveListener: Listener? = null

    fun content(content: String) {
        this.content = content
    }

    fun withTitle(title: String) {
        this.title = title
    }

    fun withPositive(positiveText: String, positiveListener: Listener? = null) {
        this.positiveText = positiveText
        this.positiveListener = positiveListener
    }

    fun withNegative(negativeText: String, negativeListener: Listener? = null) {
        this.negativeText = negativeText
        this.negativeListener = negativeListener
    }

    fun withIcon(icon: Drawable?) {
        this.icon = icon
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        binder = DialogViewBinding.inflate(LayoutInflater.from(context), container, false)
        return binder.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        if (savedInstanceState != null) {
            this.dismissAllowingStateLoss()
            return
        }
        binder.title.text = this.title
        binder.message.text = this.content

        if (positiveText != null)
            binder.positive.text = positiveText
        else
            binder.positive.visibility = View.GONE
        binder.positive.setOnClickListener {
            this.dismiss()
            positiveListener?.let {
                it(this)
            }
        }

        if (negativeText != null)
            binder.negative.text = negativeText
        else
            binder.negative.visibility = View.GONE
        binder.negative.setOnClickListener {
            this.dismiss()
            negativeListener?.let {
                it(this)
            }
        }

        if (icon == null)
            binder.icon.visibility = View.GONE
        else
            binder.icon.setImageDrawable(icon)
    }


    override fun onConfigurationChanged(newConfig: Configuration) {
        super.onConfigurationChanged(newConfig)
        Timber.d("on configuration change")
        dismissAllowingStateLoss()
    }

    companion object {
        @JvmStatic
        fun newInstance(bundle: Bundle): DialogView {
            val fragment = DialogView()
            fragment.arguments = bundle
            return fragment
        }
    }
}

dimens.xml

<resources>
    <dimen name="dialog_button_width">280dp</dimen>
    <dimen name="dialog_button_height">64dp</dimen>
    <dimen name="dialog_positive_button_radius">24dp</dimen>
    <dimen name="dialog_icon_size">24dp</dimen>
    <dimen name="dialog_padding">32dp</dimen>
    <dimen name="dialog_button_negative_height">42dp</dimen>
    <dimen name="dialog_card_radius">16dp</dimen>

    <dimen name="activity_default_padding">16dp</dimen>
    <dimen name="activity_default_padding_big">24dp</dimen>
    <dimen name="activity_default_padding_minus_spacing">12dp</dimen>
    <dimen name="activity_small_padding">8dp</dimen>
    <dimen name="activity_small_padding_half">4dp</dimen>
</resources>

rouded_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="@color/dialog_background" />
    <corners
        android:topLeftRadius="@dimen/dialog_card_radius"
        android:topRightRadius="@dimen/dialog_card_radius" />
</shape>

themes.xml

<resources>
    <!-- Base application theme. -->
    <style name="YourTheme" parent="Theme.MaterialComponents....">
        ...
        <item name="bottomSheetDialogTheme">@style/AppBottomSheetDialogTheme</item>
    </style>

    <style name="AppBottomSheetDialogTheme" parent="Theme.Design.Light.BottomSheetDialog">
        <item name="bottomSheetStyle">@style/AppModalStyle</item>
    </style>

    <style name="AppModalStyle" parent="Widget.Design.BottomSheet.Modal">
        <item name="android:background">@drawable/rounded_dialog</item>
    </style>
</resources>