Question

In the ConstraintLayout below, why wouldn't button expand to fill the width of parent?

    <androidx.constraintlayout.widget.ConstrantLayout

        ...>

    <Button

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:text="Button"

            app:layout_constraintStart_toStartOf="parent"

            app:layout_constraintTop_toTopOf="parent"/>

    </androidx.constraintlayout.widget.ConstrantLayout>

1.  The button does not have a size
2.  The button is not constrained to the end of the parent container
3.  Buttons cannot expand beyond their default size
4.  The button should have its height set to 0dp as well

Answer 1

2