DayView localization issue

library/src/main/java/com/prolificinteractive/materialcalendarview/CalendarPagerAdapter.java

@@ -6,6 +6,7 @@
 import android.view.ViewGroup;
 
 import com.prolificinteractive.materialcalendarview.MaterialCalendarView.ShowOtherDates;
+import com.prolificinteractive.materialcalendarview.format.DateFormatDayFormatter;
 import com.prolificinteractive.materialcalendarview.format.DayFormatter;
 import com.prolificinteractive.materialcalendarview.format.TitleFormatter;
 import com.prolificinteractive.materialcalendarview.format.WeekDayFormatter;
@@ -36,7 +37,7 @@ abstract class CalendarPagerAdapter<V extends CalendarPagerView> extends PagerAd
     private DateRangeIndex rangeIndex;
     private List<CalendarDay> selectedDates = new ArrayList<>();
     private WeekDayFormatter weekDayFormatter = WeekDayFormatter.DEFAULT;
-    private DayFormatter dayFormatter = DayFormatter.DEFAULT;
+    private DayFormatter dayFormatter = DateFormatDayFormatter.getInstance();
     private List<DayViewDecorator> decorators = new ArrayList<>();
     private List<DecoratorResult> decoratorResults = null;
     private boolean selectionEnabled = true;

library/src/main/java/com/prolificinteractive/materialcalendarview/DayView.java

@@ -21,6 +21,7 @@
 import android.widget.CheckedTextView;
 
 import com.prolificinteractive.materialcalendarview.MaterialCalendarView.ShowOtherDates;
+import com.prolificinteractive.materialcalendarview.format.DateFormatDayFormatter;
 import com.prolificinteractive.materialcalendarview.format.DayFormatter;
 
 import java.util.List;
@@ -42,7 +43,7 @@ class DayView extends CheckedTextView {
     private Drawable customBackground = null;
     private Drawable selectionDrawable;
     private Drawable mCircleDrawable;
-    private DayFormatter formatter = DayFormatter.DEFAULT;
+    private DayFormatter formatter = DateFormatDayFormatter.getInstance();
 
     private boolean isInRange = true;
     private boolean isInMonth = true;
@@ -77,7 +78,7 @@ public void setDay(CalendarDay date) {
      * @param formatter new label formatter
      */
     public void setDayFormatter(DayFormatter formatter) {
-        this.formatter = formatter == null ? DayFormatter.DEFAULT : formatter;
+        this.formatter = formatter == null ? DateFormatDayFormatter.getInstance(): formatter;
         CharSequence currentLabel = getText();
         Object[] spans = null;
         if (currentLabel instanceof Spanned) {

library/src/main/java/com/prolificinteractive/materialcalendarview/MaterialCalendarView.java

@@ -27,6 +27,7 @@
 import android.widget.TextView;
 
 import com.prolificinteractive.materialcalendarview.format.ArrayWeekDayFormatter;
+import com.prolificinteractive.materialcalendarview.format.DateFormatDayFormatter;
 import com.prolificinteractive.materialcalendarview.format.DateFormatTitleFormatter;
 import com.prolificinteractive.materialcalendarview.format.DayFormatter;
 import com.prolificinteractive.materialcalendarview.format.MonthArrayTitleFormatter;
@@ -939,7 +940,7 @@ public void setWeekDayFormatter(WeekDayFormatter formatter) {
      * @param formatter the new formatter, null for default
      */
     public void setDayFormatter(DayFormatter formatter) {
-        adapter.setDayFormatter(formatter == null ? DayFormatter.DEFAULT : formatter);
+        adapter.setDayFormatter(formatter == null ? DateFormatDayFormatter.getInstance() : formatter);
     }
 
     /**

library/src/main/java/com/prolificinteractive/materialcalendarview/format/DateFormatDayFormatter.java

@@ -13,24 +13,60 @@
  */
 public class DateFormatDayFormatter implements DayFormatter {
 
-    private final DateFormat dateFormat;
+    private DateFormat dateFormat;
+    private Locale lastKnownLocal;
+
+    //create singleton instance from DateFormatDayFormatter to avoid creating redundant instance for each DayView.
+    private static DateFormatDayFormatter dateFormatDayFormatter;
+
+
+    public static DateFormatDayFormatter getInstance() {
+        if (dateFormatDayFormatter == null)
+            dateFormatDayFormatter = new DateFormatDayFormatter();
+        else {
+            //if user change local and resume the activity the calender now will draw DayView text with the new Local.
+            Locale currentLocal = Locale.getDefault();
+            if (!dateFormatDayFormatter.getLastKnownLocal().equals(currentLocal)) {
+                dateFormatDayFormatter.setLastKnownLocal(currentLocal);
+                dateFormatDayFormatter.setDateFormat(new SimpleDateFormat("d", currentLocal));
+            }
+        }
+        return dateFormatDayFormatter;
+    }
 
     /**
      * Format using a default format
      */
-    public DateFormatDayFormatter() {
+    private DateFormatDayFormatter() {
         this.dateFormat = new SimpleDateFormat("d", Locale.getDefault());
+        this.lastKnownLocal = Locale.getDefault();
     }
 
     /**
      * Format using a specific {@linkplain DateFormat}
      *
      * @param format the format to use
      */
-    public DateFormatDayFormatter(@NonNull DateFormat format) {
+    private DateFormatDayFormatter(@NonNull DateFormat format) {
         this.dateFormat = format;
     }
 
+    public Locale getLastKnownLocal() {
+        return lastKnownLocal;
+    }
+
+    public void setLastKnownLocal(Locale lastKnownLocal) {
+        this.lastKnownLocal = lastKnownLocal;
+    }
+
+    public DateFormat getDateFormat() {
+        return dateFormat;
+    }
+
+    public void setDateFormat(DateFormat dateFormat) {
+        this.dateFormat = dateFormat;
+    }
+
     /**
      * {@inheritDoc}
      */

library/src/main/java/com/prolificinteractive/materialcalendarview/format/DayFormatter.java

@@ -23,5 +23,4 @@ public interface DayFormatter {
     /**
      * Default implementation used by {@linkplain com.prolificinteractive.materialcalendarview.MaterialCalendarView}
      */
-    public static final DayFormatter DEFAULT = new DateFormatDayFormatter();
 }