Use different version of CLDR data in DatePicker

The ICU CLDR data doesn't use the month abbreviations that are
appropriate for the DatePicker, so use the framework copy of the CLDR
data.

Bug: 2641810
Note: cherry-picked from Honeycomb

Change-Id: I3c045dbfb751b8b7ce6361b5a67407206fc64db1

Author: sganov

core/java/android/widget/DatePicker.java

@@ -22,6 +22,7 @@
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.text.format.DateFormat;
+import android.text.format.DateUtils;
 import android.util.AttributeSet;
 import android.util.SparseArray;
 import android.view.LayoutInflater;
@@ -33,6 +34,7 @@
 import java.text.DateFormatSymbols;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
+import java.util.Locale;
 
 /**
  * A view for selecting a month / year / day based on a calendar like layout.
@@ -47,7 +49,10 @@ public class DatePicker extends FrameLayout {
 
     private static final int DEFAULT_START_YEAR = 1900;
     private static final int DEFAULT_END_YEAR = 2100;
-    
+
+    // This ignores Undecimber, but we only support real Gregorian calendars.
+    private static final int NUMBER_OF_MONTHS = 12;
+
     /* UI Components */
     private final NumberPicker mDayPicker;
     private final NumberPicker mMonthPicker;
@@ -62,6 +67,10 @@ public class DatePicker extends FrameLayout {
     private int mMonth;
     private int mYear;
 
+    private Object mMonthUpdateLock = new Object();
+    private volatile Locale mMonthLocale;
+    private String[] mShortMonths;
+
     /**
      * The callback used to indicate the user changes the date.
      */
@@ -102,8 +111,7 @@ public void onChanged(NumberPicker picker, int oldVal, int newVal) {
         });
         mMonthPicker = (NumberPicker) findViewById(R.id.month);
         mMonthPicker.setFormatter(NumberPicker.TWO_DIGIT_FORMATTER);
-        DateFormatSymbols dfs = new DateFormatSymbols();
-        String[] months = dfs.getShortMonths();
+        final String[] months = getShortMonths();
 
         /*
          * If the user is in a locale where the month names are numeric,
@@ -114,9 +122,9 @@ public void onChanged(NumberPicker picker, int oldVal, int newVal) {
             for (int i = 0; i < months.length; i++) {
                 months[i] = String.valueOf(i + 1);
             }
-            mMonthPicker.setRange(1, 12);
+            mMonthPicker.setRange(1, NUMBER_OF_MONTHS);
         } else {
-            mMonthPicker.setRange(1, 12, months);
+            mMonthPicker.setRange(1, NUMBER_OF_MONTHS, months);
         }
 
         mMonthPicker.setSpeed(200);
@@ -246,11 +254,30 @@ public void updateDate(int year, int monthOfYear, int dayOfMonth) {
             mMonth = monthOfYear;
             mDay = dayOfMonth;
             updateSpinners();
-            reorderPickers(new DateFormatSymbols().getShortMonths());
+            reorderPickers(getShortMonths());
             notifyDateChanged();
         }
     }
 
+    private String[] getShortMonths() {
+        final Locale currentLocale = Locale.getDefault();
+        if (currentLocale.equals(mMonthLocale) && mShortMonths != null) {
+            return mShortMonths;
+        } else {
+            synchronized (mMonthUpdateLock) {
+                if (!currentLocale.equals(mMonthLocale)) {
+                    mShortMonths = new String[NUMBER_OF_MONTHS];
+                    for (int i = 0; i < NUMBER_OF_MONTHS; i++) {
+                        mShortMonths[i] = DateUtils.getMonthString(Calendar.JANUARY + i,
+                                DateUtils.LENGTH_MEDIUM);
+                    }
+                    mMonthLocale = currentLocale;
+                }
+            }
+            return mShortMonths;
+        }
+    }
+
     private static class SavedState extends BaseSavedState {
 
         private final int mYear;