Q12.Create an application to Create, Insert, update and Delete operation on the database File consists : 1.activity_main.xml 2.Main_Activity.java 3.kDatabaseAdapter.java 4.Message.java activity_main.xml <? xml version= "1.0" encoding= "utf-8" ?> < RelativeLayout 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" android :layout_height= "match_parent" tools :context= "com.haldar.kishan.progm12.MainActivity" > < EditText android :id= "@+id/user" android :layout_width= "wrap_content" android :layout_height= "wrap_content" android :layout_alignParentTop= "true" android :layout_centerHorizontal= "true...