Use "ldrtl" and "ldltr" config qualifiers for RTL / LTR resources

- we cannot use "rtl" / "ltr" qualifiers as they can conflict with ISO-639 Alpha-3
codespace which uses 3 letters for identifying a language code (and could use either
"rtl" or "ltr" strings for defining a language in the future).

- we are using instead "ldrtl" for RTL and "ldltr" for LTR resources. Those qualifiers
are defined by more than 3 chars and outside of what is defined into ISO-639. They
are also more understandable as "ld" prefix is for "layoutdirection"

Change-Id: Id43e948103707e09bef63ebd54ac1779dde58e72

Author: Fabrice Di Meglio

core/java/android/content/res/Configuration.java

@@ -536,8 +536,8 @@ public String toString() {
         int layoutDir = (screenLayout&SCREENLAYOUT_LAYOUTDIR_MASK);
         switch (layoutDir) {
             case SCREENLAYOUT_LAYOUTDIR_UNDEFINED: sb.append(" ?layoutDir"); break;
-            case SCREENLAYOUT_LAYOUTDIR_LTR: sb.append(" ltr"); break;
-            case SCREENLAYOUT_LAYOUTDIR_RTL: sb.append(" rtl"); break;
+            case SCREENLAYOUT_LAYOUTDIR_LTR: sb.append(" ldltr"); break;
+            case SCREENLAYOUT_LAYOUTDIR_RTL: sb.append(" ldrtl"); break;
             default: sb.append(" layoutDir=");
                 sb.append(layoutDir >> SCREENLAYOUT_LAYOUTDIR_SHIFT); break;
         }

libs/androidfw/ResourceTypes.cpp

@@ -2061,10 +2061,10 @@ String8 ResTable_config::toString() const {
         if (res.size() > 0) res.append("-");
         switch (screenLayout&ResTable_config::MASK_LAYOUTDIR) {
             case ResTable_config::LAYOUTDIR_LTR:
-                res.append("ltr");
+                res.append("ldltr");
                 break;
             case ResTable_config::LAYOUTDIR_RTL:
-                res.append("rtl");
+                res.append("ldrtl");
                 break;
             default:
                 res.appendFormat("layoutDir=%d",

tools/aapt/AaptAssets.cpp

@@ -995,12 +995,12 @@ bool AaptGroupEntry::getLayoutDirectionName(const char* name, ResTable_config* o
                 (out->screenLayout&~ResTable_config::MASK_LAYOUTDIR)
                 | ResTable_config::LAYOUTDIR_ANY;
         return true;
-    } else if (strcmp(name, "ltr") == 0) {
+    } else if (strcmp(name, "ldltr") == 0) {
         if (out) out->screenLayout =
                 (out->screenLayout&~ResTable_config::MASK_LAYOUTDIR)
                 | ResTable_config::LAYOUTDIR_LTR;
         return true;
-    } else if (strcmp(name, "rtl") == 0) {
+    } else if (strcmp(name, "ldrtl") == 0) {
         if (out) out->screenLayout =
                 (out->screenLayout&~ResTable_config::MASK_LAYOUTDIR)
                 | ResTable_config::LAYOUTDIR_RTL;