Why doesn't the layout design preview get displayed on my Android Studio?
问题 I don't know if it's me or something but I can't place a simple text or a button in design mode in Android Studio If it helps, this is the code: <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <Button android:id="@+id/button2" style="