BayernMessenger/app/src/main/res/layout/activity_login.xml

<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="match_parent">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="24dp">

            <ImageView
                android:id="@+id/logoImageView"
                android:layout_width="wrap_content"
                android:layout_height="100dp"
                android:src="@drawable/logo_login" />

            <EditText
                android:id="@+id/loginField"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="24dp"
                android:hint="Username"
                android:inputType="textEmailAddress"
                android:maxLines="1" />


            <EditText
                android:id="@+id/passwordField"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:ems="10"
                android:hint="Password"
                android:inputType="textPassword"
                android:maxLines="1" />

        </LinearLayout>
    </ScrollView>

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_centerInParent="true"
        android:layout_margin="8dp"
        android:visibility="gone"
        app:layout_constraintBottom_toTopOf="@+id/authenticateButton"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/authenticateButton"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:text="Authenticate"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>