+ <Button
+ android:id="@+id/sendButton"
+ android:layout_width="wrap_content"
+ android:layout_height="wrap_content"
+ android:layout_marginStart="16dp"
+ android:layout_marginEnd="16dp"
+ android:onClick="sendMessage"
+ android:text="@string/button_send"
+ app:layout_constraintBaseline_toBaselineOf="@+id/messageText"
+ app:layout_constraintEnd_toEndOf="parent"
+ app:layout_constraintHorizontal_bias="0.5"
+ app:layout_constraintStart_toEndOf="@+id/messageText" />