Use mono icon as background.

Author: CDrummond

android/app/src/main/res/layout/activity_main.xml

@@ -8,6 +8,14 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_margin="32dp"
+        android:alpha="0.05"
+        android:src="@drawable/ic_mono_icon"
+        android:scaleType="centerCrop" />
+
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"