fix order of markers

app/src/main/java/org/isoron/uhabits/helpers/DateHelper.java

@@ -206,6 +206,30 @@ public class DateHelper
         return wdays;
     }
 
+
+    /**
+     *
+     * @return array with week days numbers starting according to locale settings,
+     * e.g. [2,3,4,5,6,7,1] in Europe
+     *
+     * @see java.util.Calendar#SUNDAY
+     *
+     */
+    public static Integer[] getLocaleWeekdayList()
+    {
+        Integer[] dayNumbers = new Integer[7];
+        // a dummy calendar
+        Calendar calendar = new GregorianCalendar();
+        // set staring day according to locale
+        calendar.set(GregorianCalendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek());
+        for (int i = 0; i < dayNumbers.length; i++) {
+            dayNumbers[i] = calendar.get(GregorianCalendar.DAY_OF_WEEK);
+            // advance in time by one day
+            calendar.add(GregorianCalendar.DAY_OF_MONTH, 1);
+        }
+        return dayNumbers;
+    }
+
     public static String formatWeekdayList(Context context, boolean weekday[])
     {
         String shortDayNames[] = getShortDayNames();

app/src/main/java/org/isoron/uhabits/views/HabitFrequencyView.java

@@ -63,6 +63,8 @@ public class HabitFrequencyView extends ScrollableDataView implements HabitDataV
 
     private HashMap<Long, Integer[]> frequency;
     private String wdays[];
+    private Integer[] localeWeekdayList;
+    private HashMap<Integer, Integer> number2wdays;
 
     public HabitFrequencyView(Context context)
     {
@@ -91,6 +93,17 @@ public class HabitFrequencyView extends ScrollableDataView implements HabitDataV
 
         wdays = DateHelper.getShortDayNames();
 
+        /**
+         * here we create the mapping of week days numbers into the "wdays"-indices
+         * @see DateHelper#getDayNames(int)
+         */
+        localeWeekdayList = DateHelper.getLocaleWeekdayList();
+        number2wdays = new HashMap<>();
+        for (Integer number : localeWeekdayList) {
+            int wdaysIndex = number % 7;
+            number2wdays.put(number, wdaysIndex);
+        }
+
         dfMonth = DateHelper.getDateFormat("MMM");
         dfYear = DateHelper.getDateFormat("yyyy");
 
@@ -230,11 +243,12 @@ public class HabitFrequencyView extends ScrollableDataView implements HabitDataV
         float rowHeight = rect.height() / 8.0f;
         prevRect.set(rect);
 
-        for (int i = 0; i < 7; i++)
+        for (int j = 0; j < localeWeekdayList.length; j++)
         {
             rect.set(0, 0, baseSize, baseSize);
-            rect.offset(prevRect.left, prevRect.top + columnWidth * i);
+            rect.offset(prevRect.left, prevRect.top + columnWidth * j);
 
+            int i = number2wdays.get(localeWeekdayList[j]);
             if(values != null)
                 drawMarker(canvas, rect, values[i]);
 
@@ -265,16 +279,15 @@ public class HabitFrequencyView extends ScrollableDataView implements HabitDataV
 
     private void drawGrid(Canvas canvas, RectF rGrid)
     {
-        int nRows = 7;
+        int nRows = localeWeekdayList.length;
         float rowHeight = rGrid.height() / (nRows + 1);
 
         pText.setTextAlign(Paint.Align.LEFT);
         pText.setColor(textColor);
         pGrid.setColor(dimmedTextColor);
 
-        for (int i = 0; i < nRows; i++)
-        {
-            canvas.drawText(wdays[i], rGrid.right - columnWidth,
+        for (Integer dayNumber : localeWeekdayList) {
+            canvas.drawText(wdays[number2wdays.get(dayNumber)], rGrid.right - columnWidth,
                     rGrid.top + rowHeight / 2 + 0.25f * em, pText);
 
             pGrid.setStrokeWidth(1f);