app/src/main/res/layout/activity_main.xml

   1 <?xml version="1.0" encoding="utf-8"?>
   2 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   3     xmlns:app="http://schemas.android.com/apk/res-auto"
   4     xmlns:tools="http://schemas.android.com/tools"
   5     android:layout_width="match_parent"
   6     android:layout_height="match_parent"
   7     tools:context=".MainActivity">
   8
   9     <TextView
  10         android:layout_width="wrap_content"
  11         android:layout_height="wrap_content"
  12         android:text="@string/app_name"
  13         app:layout_constraintBottom_toBottomOf="parent"
  14         app:layout_constraintLeft_toLeftOf="parent"
  15         app:layout_constraintRight_toRightOf="parent"
  16         app:layout_constraintTop_toTopOf="parent" />
  17
  18     <Button
  19         android:id="@+id/button"
  20         android:layout_width="wrap_content"
  21         android:layout_height="wrap_content"
  22         android:layout_marginBottom="18dp"
  23         android:layout_marginEnd="149dp"
  24         android:layout_marginStart="147dp"
  25         android:text="Button"
  26         app:layout_constraintBottom_toBottomOf="parent"
  27         app:layout_constraintEnd_toEndOf="parent"
  28         app:layout_constraintStart_toStartOf="parent" />
  29
  30     <SurfaceView
  31         android:id="@+id/surfaceView"
  32         android:layout_width="292dp"
  33         android:layout_height="152dp"
  34         android:layout_marginEnd="5dp"
  35         android:layout_marginStart="5dp"
  36         android:layout_marginTop="10dp"
  37         app:layout_constraintEnd_toEndOf="parent"
  38         app:layout_constraintStart_toStartOf="parent"
  39         app:layout_constraintTop_toTopOf="parent" />
  40
  41     <Button
  42         android:id="@+id/button2"
  43         android:layout_width="wrap_content"
  44         android:layout_height="wrap_content"
  45         android:layout_marginBottom="38dp"
  46         android:text="@string/btnPlay"
  47         app:layout_constraintBottom_toTopOf="@+id/button"
  48         tools:layout_editor_absoluteX="147dp" />
  49
  50 </android.support.constraint.ConstraintLayout>