DB/room

Error:(12, 17) 警告: Schema export directory is not provided to the annotation processor so we cannot export the schema. You can either provide `room.schemaLocation` annotation processor argument OR set exportSchema to false.
Error:(21, 27) 错误: To use RxJava2 features, you must add `rxjava2` artifact from Room as a dependency. android.arch.persistence.room:rxjava2:<version>

public static void setIndicator(Context context, TabLayout tabs, int leftDip, int rightDip) {
       Class<?> tabLayout = tabs.getClass();
       Field tabStrip = null;
       try {
           tabStrip = tabLayout.getDeclaredField("mTabStrip");
       } catch (NoSuchFieldException e) {
           e.printStackTrace();
       }
       tabStrip.setAccessible(true);
       LinearLayout ll_tab = null;
       try {
           ll_tab = (LinearLayout) tabStrip.get(tabs);
       } catch (IllegalAccessException e) {
           e.printStackTrace();
       }
       int left = (int) (getDisplayMetrics(context).density * leftDip);
       int right = (int) (getDisplayMetrics(context).density * rightDip);
       for (int i = 0; i < ll_tab.getChildCount(); i++) {
           View child = ll_tab.getChildAt(i);
           child.setPadding(0, 0, 0, 0);
           LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.MATCH_PARENT, 1);
           params.leftMargin = left;
           params.rightMargin = right;
           child.setLayoutParams(params);
           child.invalidate();
       }
   }

ArrayList<String> places = new ArrayList<String>();
places.add("Buenos Aires");
places.add("Córdoba");
places.add("La Plata");
之后我重构了下
ArrayList<String> places = new ArrayList<String>(
Arrays.asList("Buenos Aires", "Córdoba", "La Plata"));