FairEmail/app/src/main/res/layout/fragment_identity.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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="match_parent"
    android:orientation="vertical"
    tools:context=".ActivityView">

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="12dp">

        <!-- name -->

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

        <EditText
            android:id="@+id/etName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textCapSentences"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/tvName" />

        <!-- email -->

        <TextView
            android:id="@+id/tvEmail"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_email"
            android:textAppearance="@style/TextAppearance.AppCompat.Small"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/etName" />

        <EditText
            android:id="@+id/etEmail"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textEmailAddress"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/tvEmail" />

        <!--- provider -->

        <TextView
            android:id="@+id/tvProvider"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_provider"
            android:textAppearance="@style/TextAppearance.AppCompat.Small"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/etEmail" />

        <Spinner
            android:id="@+id/spProvider"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/tvProvider" />

        <!-- SMTP -->

        <TextView
            android:id="@+id/tvSmtp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_smtp"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/spProvider" />

        <!-- host -->

        <TextView
            android:id="@+id/tvHost"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_host"
            android:textAppearance="@style/TextAppearance.AppCompat.Small"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/tvSmtp" />

        <EditText
            android:id="@+id/etHost"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="smtp.domain.tld"
            android:inputType="text"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/tvHost" />

        <!-- STARTTLS -->

        <CheckBox
            android:id="@+id/cbStartTls"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_starttls"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/etHost" />

        <!-- port -->

        <TextView
            android:id="@+id/tvPort"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_port"
            android:textAppearance="@style/TextAppearance.AppCompat.Small"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/cbStartTls" />

        <EditText
            android:id="@+id/etPort"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="465"
            android:inputType="number"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/tvPort" />

        <!-- password -->

        <TextView
            android:id="@+id/tvUser"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_user"
            android:textAppearance="@style/TextAppearance.AppCompat.Small"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/etPort" />

        <EditText
            android:id="@+id/etUser"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="text"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/tvUser" />

        <!-- password -->

        <TextView
            android:id="@+id/tvPassword"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_password"
            android:textAppearance="@style/TextAppearance.AppCompat.Small"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/etUser" />

        <EditText
            android:id="@+id/etPassword"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/tvPassword" />

        <CheckBox
            android:id="@+id/cbPrimary"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_primary_identity"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/etPassword" />

        <CheckBox
            android:id="@+id/cbSynchronize"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@string/title_synchronize_identity"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/cbPrimary" />

        <Button
            android:id="@+id/btnOk"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="12dp"
            android:text="@android:string/ok"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/cbSynchronize" />

        <ProgressBar
            android:id="@+id/pbCheck"
            style="@style/Base.Widget.AppCompat.ProgressBar"
            android:layout_width="24dp"
            android:layout_height="24dp"
            android:layout_marginStart="12dp"
            android:indeterminate="true"
            app:layout_constraintBottom_toBottomOf="@id/btnOk"
            app:layout_constraintStart_toEndOf="@id/btnOk"
            app:layout_constraintTop_toTopOf="@id/btnOk" />

        <android.support.constraint.Group
            android:id="@+id/grpReady"
            android:layout_width="0dp"
            android:layout_height="0dp"
            app:constraint_referenced_ids="etName,etEmail,spProvider,etHost,cbStartTls,etPort,etUser,etPassword,cbPrimary,cbSynchronize,btnOk" />
    </android.support.constraint.ConstraintLayout>
</ScrollView>