text: <?xml version="1.0" encoding="utf-8"?>
  <android.support.constraint.ConstraintLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:fitsSystemWindows="false">
      <SurfaceView
          android:id="@+id/mSurfaceView"
          android:layout_width="match_parent"
          android:layout_height="match_parent"/>
      <ImageView
          android:id="@+id/view2"
          android:layout_width="0dp"
          android:layout_height="0dp"
          android:layout_margin="20dp"
          app:layout_constraintTop_toTopOf="parent"
          app:layout_constraintBottom_toBottomOf="parent"
          android:background="@drawable/rpa_huli_rzpz_bianjiao_icon"
          app:layout_constraintDimensionRatio="w,85.6:54"
          app:layout_constraintLeft_toLeftOf="parent"
          app:layout_constraintRight_toRightOf="parent"/>
  </android.support.constraint.ConstraintLayout>