xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
+ android:background="@android:color/background_dark"
tools:context=".MainActivity">
- <TextView
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="Hello World!"
- app:layout_constraintBottom_toBottomOf="parent"
- app:layout_constraintLeft_toLeftOf="parent"
- app:layout_constraintRight_toRightOf="parent"
- app:layout_constraintTop_toTopOf="parent" />
-
</android.support.constraint.ConstraintLayout>
\ No newline at end of file