Android guru

For resolve this error follow these steps: Fristly create android project ,type name like MyApplication3 (Maintion in this project) if you do'nt know how to create android project ,then follow below link How to create android project in android studio Type below code in activity_main.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" xmlns: ads ="http://schemas.android.com/apk/res-auto" tools :context =".MainActivity" > < TextView android :layout_width ="wrap_content" android :layout_height ="wrap_content" android :text ="Hello World!" a