Update UI

app/src/main/res/layout/fragment_data_list.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout
-        xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout 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"
@@ -10,22 +9,33 @@
 		android:id="@+id/title"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-            android:text="Data List"
+		android:layout_marginStart="8dp"
 		android:layout_marginTop="8dp"
-            app:layout_constraintTop_toTopOf="parent"
-            app:layout_constraintEnd_toEndOf="parent"
 		android:layout_marginEnd="8dp"
+		android:text="Data List"
+		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-            android:layout_marginStart="8dp"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<androidx.recyclerview.widget.RecyclerView
 		android:id="@+id/recyclerView"
 		android:layout_width="0dp"
 		android:layout_height="0dp"
-            app:layout_constraintTop_toBottomOf="@+id/title"
+		android:layout_marginTop="8dp"
+		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@+id/title" />
+
+	<com.google.android.material.floatingactionbutton.FloatingActionButton
+		android:id="@+id/addButton"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginEnd="16dp"
+		android:layout_marginBottom="16dp"
+		android:src="@drawable/ic_add_white_24dp"
+		app:fabSize="normal"
 		app:layout_constraintBottom_toBottomOf="parent"
-            android:layout_marginTop="8dp"/>
+		app:layout_constraintEnd_toEndOf="parent" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>