text: 
  
  <com.itheima.shotplane.PlaneWar xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:background="@drawable/game_bg"
     >
     
      
      
  </com.itheima.shotplane.PlaneWar>
  