ComunicAndroid/app/src/main/res/layout/view_group_membership_status.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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">

    <android.support.constraint.ConstraintLayout
        android:id="@+id/respondInvitationForm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:id="@+id/textView9"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginStart="8dp"
            android:text="@string/notice_group_invited"
            app:layout_constraintEnd_toEndOf="@+id/acceptButton"
            app:layout_constraintStart_toStartOf="@+id/acceptButton" />

        <Button
            android:id="@+id/rejectButton"
            style="@style/GroupMembershipButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:backgroundTint="@android:color/holo_red_dark"
            android:text="@string/action_group_reject_request"
            android:textColor="@android:color/white"
            app:layout_constraintEnd_toEndOf="@+id/acceptButton"
            app:layout_constraintStart_toStartOf="@+id/acceptButton"
            app:layout_constraintTop_toBottomOf="@+id/acceptButton" />

        <Button
            android:id="@+id/acceptButton"
            style="@style/GroupMembershipButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:backgroundTint="@color/holo_green_dark"
            android:text="@string/action_group_accept_request"
            android:textColor="@android:color/white"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView9" />
    </android.support.constraint.ConstraintLayout>

    <android.support.constraint.ConstraintLayout
        android:id="@+id/cancelRequestForm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/respondInvitationForm">

        <TextView
            android:id="@+id/textView10"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/notice_group_requested"
            app:layout_constraintEnd_toEndOf="@+id/cancelButton"
            app:layout_constraintStart_toStartOf="@+id/cancelButton"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/cancelButton"
            style="@style/GroupMembershipButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:layout_marginEnd="8dp"
            android:backgroundTint="@android:color/holo_red_dark"
            android:text="@string/action_group_cancel_membership_request"
            android:textColor="@android:color/white"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView10" />
    </android.support.constraint.ConstraintLayout>

    <android.support.constraint.ConstraintLayout
        android:id="@+id/requestForm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/cancelRequestForm">

        <Button
            android:id="@+id/joinButton"
            style="@style/GroupMembershipButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginTop="8dp"
            android:backgroundTint="@color/dark_blue"
            android:text="@string/action_join_group"
            android:textColor="@android:color/white"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </android.support.constraint.ConstraintLayout>

    <android.support.constraint.ConstraintLayout
        android:id="@+id/memberForm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/requestForm">

        <Button
            android:id="@+id/leaveButton"
            style="@style/GroupMembershipButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginTop="8dp"
            android:backgroundTint="@android:color/holo_red_dark"
            android:text="@string/action_leave_group"
            android:textColor="@android:color/white"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>