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Android Build a Simple Android App Creating the Screen Layout Adding a Button

paste and copy the textview and change it to button

how to copy and past

activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent" >

  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

  <button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:id="@+id/button" />

</RelativeLayout>