TestApp
Main_Activity.xml <? xml version= "1.0" encoding= "utf-8" ?> < RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" xmlns: app = "http://schemas.android.com/apk/res-auto" android :layout_width= "match_parent" android :layout_height= "match_parent" android :paddingLeft= "@dimen/activity_horizontal_margin" android :paddingRight= "@dimen/activity_horizontal_margin" android :paddingTop= "@dimen/activity_vertical_margin" android :paddingBottom= "@dimen/activity_vertical_margin" app :layout_behavior= "@string/appbar_scrolling_view_behavior" tools :showIn= "@layout/activity_main" tools :context= "com.example.bc.myapplication.MainActivity" > < TextView android :layout_width= "wrap_content" ...