session-android/res/layout/unknown_sender_view.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:paddingStart="16dp"
              android:paddingEnd="16dp"
              android:layout_marginTop="20dp"
              android:background="@color/white">

    <TextView android:id="@+id/unknown_sender_label"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_marginTop="10dp"
              android:layout_marginBottom="25dp"
              android:textColor="?android:textColorSecondary"
              android:text="@string/unknown_sender_view__the_sender_is_not_in_your_contact_list"/>


    <LinearLayout android:id="@+id/block"
                  android:orientation="horizontal"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:layout_marginBottom="25dp"
                  android:clickable="true"
                  android:gravity="center_vertical">

        <ImageView android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:src="@drawable/ic_block_white_24dp"
                   android:tint="@color/signal_primary"/>

        <TextView android:layout_marginStart="15dp"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:text="@string/unknown_sender_view__block"
                  android:textAllCaps="true"
                  android:textStyle="bold"
                  android:textColor="@color/signal_primary"
                  android:textSize="14sp"/>

    </LinearLayout>

    <LinearLayout android:id="@+id/add_to_contacts"
                  android:clickable="true"
                  android:orientation="horizontal"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:layout_marginBottom="25dp"
                  android:gravity="center_vertical">

        <ImageView android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:src="@drawable/ic_person_add_white_24dp"
                   android:tint="@color/signal_primary"/>

        <TextView android:layout_marginStart="15dp"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:text="@string/unknown_sender_view__add_to_contacts"
                  android:textAllCaps="true"
                  android:textStyle="bold"
                  android:textColor="@color/signal_primary"
                  android:textSize="14sp"/>

    </LinearLayout>

    <LinearLayout android:id="@+id/share_profile"
                  android:clickable="true"
                  android:orientation="horizontal"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:layout_marginBottom="25dp"
                  android:gravity="center_vertical">

        <ImageView android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:src="@drawable/ic_face_white_24dp"
                   android:tint="@color/signal_primary"/>

        <TextView android:layout_marginStart="15dp"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:text="@string/unknown_sender_view__don_t_add_but_make_my_profile_visible"
                  android:textAllCaps="true"
                  android:textStyle="bold"
                  android:textColor="@color/signal_primary"
                  android:textSize="14sp"/>

    </LinearLayout>

</LinearLayout>