shadows/framework/src/main/java/org/robolectric/shadows/ShadowDisplayManager.java
public static void configureDefaultDisplay(Configuration configuration, DisplayMetrics displayMetrics) {
    ShadowDisplayManagerGlobal shadowDisplayManagerGlobal = getShadowDisplayManagerGlobal();
    if (DisplayManagerGlobal.getInstance().getDisplayIds().length != 0) {
      throw new IllegalStateException("this method should only be called by Robolectric");
    }

    shadowDisplayManagerGlobal.addDisplay(createDisplayInfo(configuration, displayMetrics));
  }
public static void configureDefaultDisplay(Configuration configuration, DisplayMetrics displayMetrics) {
    ShadowDisplayManagerGlobal shadowDisplayManagerGlobal = getShadowDisplayManagerGlobal();
    if (DisplayManagerGlobal.getInstance().getDisplayIds().length != 0) {
      throw new IllegalStateException("this method should only be called by Robolectric");
    }

    shadowDisplayManagerGlobal.addDisplay(createDisplayInfo(configuration, displayMetrics));
  }
internal only