NumberPicker: Set formatter local value to US.

As the Arabic language formatter would make number "1,2,3" to Arabic
language word means one,two,three, NumberPicker won't like to show
any thing other than numbers, add local settings to US, make the
number 1,2,3

Change-Id: If2d161ac4133f6c9c6e1ec284d6d2fbf01855fa0

Author: Chen Libao

core/java/android/widget/NumberPicker.java

@@ -72,7 +72,8 @@ public interface Formatter {
     public static final NumberPicker.Formatter TWO_DIGIT_FORMATTER =
             new NumberPicker.Formatter() {
                 final StringBuilder mBuilder = new StringBuilder();
-                final java.util.Formatter mFmt = new java.util.Formatter(mBuilder);
+                final java.util.Formatter mFmt = new java.util.Formatter(
+                        mBuilder, java.util.Locale.US);
                 final Object[] mArgs = new Object[1];
                 public String toString(int value) {
                     mArgs[0] = value;