alert_dialog_contacto.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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#FFFFFF">


    <TextView
        android:id="@+id/textView4"
        android:layout_width="318dp"
        android:layout_height="31dp"
        android:layout_marginStart="44dp"
        android:layout_marginTop="4dp"
        android:text="TextView"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/llamar_contacto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="44dp"
        android:text="Call"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView4" />

    <Button
        android:id="@+id/msm_whatsapp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="44dp"
        android:text="whatsapp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toEndOf="@+id/button4"
        app:layout_constraintTop_toBottomOf="@+id/textView4" />
</androidx.constraintlayout.widget.ConstraintLayout>