FairEmail/app/src/main/res/layout/dialog_identity.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"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="24dp">

    <TextView
        android:id="@+id/tvIdentity"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/title_send_via"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <eu.faircode.email.ContentLoadingProgressBar
        android:id="@+id/pbWait"
        style="@style/Base.Widget.AppCompat.ProgressBar"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:indeterminate="true"
        android:padding="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tvIdentity" />

    <Spinner
        android:id="@+id/spIdentity"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/pbWait" />

    <CheckBox
        android:id="@+id/cbNotAgain"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="12dp"
        android:text="@string/title_no_ask_again"
        android:textAppearance="@style/TextAppearance.AppCompat.Small"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/spIdentity" />

    <TextView
        android:id="@+id/tvNoIdenties"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="@string/title_no_identities"
        android:textAppearance="@style/TextAppearance.AppCompat.Medium"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/cbNotAgain" />

    <Button
        android:id="@+id/btnFix"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="12dp"
        android:text="@string/title_fix"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tvNoIdenties" />

    <androidx.constraintlayout.widget.Group
        android:id="@+id/grpIdentities"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:constraint_referenced_ids="spIdentity,cbNotAgain" />

    <androidx.constraintlayout.widget.Group
        android:id="@+id/grpNoIdentities"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:constraint_referenced_ids="tvNoIdenties,btnFix" />
</androidx.constraintlayout.widget.ConstraintLayout>