Step 1. Create a project step by step activity_main.xml <? xml version ="1.0" encoding ="utf-8" ?> <LinearLayout xmlns: android ="http://schemas.android.com/apk/res/android" xmlns: tools ="http://schemas.android.com/tools" android :layout_width ="match_parent" android :layout_height ="match_parent" android :orientation ="vertical" tools :context =".MainActivity" > <include layout ="@layout/layout_toolbar" /> <androidx.recyclerview.widget.RecyclerView android :id ="@+id/recycleView" android :layout_width ="match_parent" android :layout_height ="match_parent" android :padding ="8dp" /> </LinearLayout> layout_toolbar.xml <? xml version ="1.0" encoding ="utf-8" ?> <LinearLayout xmlns: android ="http://schemas.android.com/apk/res/...