Implementation for a custom dialog containing a TextView, an EditText and two buttons.

resolve_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="150dp">

    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/title"
            android:textSize="20sp"
            android:textStyle="bold|italic"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:text="@string/resolve"/>

    <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/anchor_id"
            android:layout_marginStart="17dp"
            android:layout_marginEnd="17dp"
            app:layout_constraintTop_toBottomOf="@+id/title"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"/>


    <TextView
            android:layout_width="wrap_content"
            android:text="@string/cancel"
            android:id="@+id/cancel"
            android:layout_marginEnd="50dp"
            android:textColor="@color/colorPrimary"
            android:textAllCaps="true"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/resolve"
            app:layout_constraintTop_toBottomOf="@+id/anchor_id"
            android:layout_height="wrap_content"/>

    <TextView
            android:layout_width="wrap_content"
            android:text="@string/res"
            android:textAllCaps="true"
            android:layout_marginEnd="17dp"
            android:id="@+id/resolve"
            android:textColor="@color/colorPrimary"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/anchor_id"
            android:layout_height="wrap_content"/>
</android.support.constraint.ConstraintLayout>

ResolveDialog.kt

package com.example.cloudanchorsardemo.dialog

import android.app.Dialog
import android.content.Context
import android.content.res.Resources
import android.os.Bundle
import android.support.annotation.NonNull
import android.view.ViewGroup
import android.view.Window
import com.example.cloudanchorsardemo.R
import kotlinx.android.synthetic.main.reslove_dialog.*

open class ResolveDialog(
    @NonNull context: Context,
    var onPositiveCallback: PositiveButtonListener
) : Dialog(context) {

    val DIALOG_SIDE_MARGIN = 20f //size in dp
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        requestWindowFeature(Window.FEATURE_NO_TITLE)

        setContentView(R.layout.reslove_dialog)

        setupDialogLayoutParams()

        cancel.setOnClickListener { dismiss() }
        resolve.setOnClickListener { onPositiveCallback.onPositiveButtonClicked(anchor_id.text.toString())
        dismiss()}

    }

    private fun setupDialogLayoutParams() {
        val metrics = context.resources.displayMetrics
        val dialogWindowWidth = metrics.widthPixels - dp2px(context.resources, DIALOG_SIDE_MARGIN).toInt()
        window!!.setLayout(dialogWindowWidth, ViewGroup.LayoutParams.WRAP_CONTENT)
    }

    fun dp2px(resources: Resources, dp: Float): Float {
        val scale = resources.displayMetrics.density
        return dp * scale + 0.5f
    }

    interface PositiveButtonListener{
        fun onPositiveButtonClicked(dialogValue: String)
    }

}