Separate StringUtils.capitalizeFirstCharacter

Bug: 8582061
Change-Id: Iac8f65defdd92d7df533bdf0e2937ad897d96363

3 files changed, 13 insertions, 5 deletions

diff --git a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
index 745e7dfed..dabc3075e 100644
--- a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
@@ -1460,7 +1460,7 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
             return "";
         }
         final Locale locale = SubtypeLocale.getSubtypeLocale(subtype);
-        return StringUtils.toTitleCase(locale.getLanguage(), locale);
+        return StringUtils.capitalizeFirstCharacter(locale.getLanguage(), locale);
     }
 
     // Get InputMethodSubtype's middle display name in its locale.
diff --git a/java/src/com/android/inputmethod/latin/StringUtils.java b/java/src/com/android/inputmethod/latin/StringUtils.java
index 59ad28fc9..4de104af5 100644
--- a/java/src/com/android/inputmethod/latin/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/StringUtils.java
@@ -106,10 +106,18 @@ public final class StringUtils {
         }
     }
 
+    public static String capitalizeFirstCharacter(final String s, final Locale locale) {
+        if (s.length() <= 1) {
+            return s.toUpperCase(locale);
+        }
+        // Please refer to the comment below in {@link #toTitleCase(String,Locale)}.
+        final int cutoff = s.offsetByCodePoints(0, 1);
+        return s.substring(0, cutoff).toUpperCase(locale) + s.substring(cutoff);
+    }
+
     public static String toTitleCase(final String s, final Locale locale) {
         if (s.length() <= 1) {
-            // TODO: is this really correct? Shouldn't this be s.toUpperCase()?
-            return s;
+            return s.toUpperCase(locale);
         }
         // TODO: fix the bugs below
         // - This does not work for Greek, because it returns upper case instead of title case.
diff --git a/java/src/com/android/inputmethod/latin/SubtypeLocale.java b/java/src/com/android/inputmethod/latin/SubtypeLocale.java
index 5e28cc2d0..ae9cd8bde 100644
--- a/java/src/com/android/inputmethod/latin/SubtypeLocale.java
+++ b/java/src/com/android/inputmethod/latin/SubtypeLocale.java
@@ -183,7 +183,7 @@ public final class SubtypeLocale {
             final Locale locale = LocaleUtils.constructLocaleFromString(localeString);
             displayName = locale.getDisplayName(displayLocale);
         }
-        return StringUtils.toTitleCase(displayName, displayLocale);
+        return StringUtils.capitalizeFirstCharacter(displayName, displayLocale);
     }
 
     // InputMethodSubtype's display name in its locale.
@@ -243,7 +243,7 @@ public final class SubtypeLocale {
                 }
             }
         };
-        return StringUtils.toTitleCase(
+        return StringUtils.capitalizeFirstCharacter(
                 getSubtypeName.runInLocale(sResources, displayLocale), displayLocale);
     }