Android: How to center an included view?

Question

as the title states i do have an view which looks as the following:

attachment_main.xml

<TextView
        android:id="@+id/Frage_attachment"
        android:layout_width="370dp"
        android:layout_height="59dp"
        android:text="Frage Attachment "
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.609"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.343" />

    <Button
        android:id="@+id/button_attachment"
        android:layout_width="112dp"
        android:layout_height="59dp"
        android:text="OK"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.214"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.572" />

This view is included in a new view as the following:

<include
        android:id="@+id/idAttachment"
        layout="@layout/attachment_main"
        android:layout_width="549dp"
        android:layout_height="808dp"
        android:visibility="visible" />

Question: In the new view, i would like to put the content of the include at the center of the screen. How do i make it happen?

Answer 1

You only need to have the next

<include
        android:id="@+id/idAttachment"
        layout="@layout/attachment_main"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:visibility="visible" />

Please not use width with fix, because you can have different resolution

android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAlignment="center"