diff --git a/include/androidfw/ResourceTypes.h b/include/androidfw/ResourceTypes.h
index 86732196518c3..65160d5bf8586 100644
--- a/include/androidfw/ResourceTypes.h
+++ b/include/androidfw/ResourceTypes.h
@@ -1195,6 +1195,12 @@ struct ResTable_config
     // Example: en-US, en-Latn-US, en-POSIX.
     void getBcp47Locale(char* out) const;
 
+    // Append to str the resource-qualifer string representation of the
+    // locale component of this Config. If the locale is only country
+    // and language, it will look like en-rUS. If it has scripts and
+    // variants, it will be a modified bcp47 tag: b+en+Latn+US.
+    void appendDirLocale(String8& str) const;
+
     // Sets the values of language, region, script and variant to the
     // well formed BCP-47 locale contained in |in|. The input locale is
     // assumed to be valid and no validation is performed.
diff --git a/libs/androidfw/ResourceTypes.cpp b/libs/androidfw/ResourceTypes.cpp
index d5d583c7ae148..e2471505182c6 100644
--- a/libs/androidfw/ResourceTypes.cpp
+++ b/libs/androidfw/ResourceTypes.cpp
@@ -2550,6 +2550,58 @@ bool ResTable_config::match(const ResTable_config& settings) const {
     return true;
 }
 
+void ResTable_config::appendDirLocale(String8& out) const {
+    if (!language[0]) {
+        return;
+    }
+
+    if (!localeScript[0] && !localeVariant[0]) {
+        // Legacy format.
+        if (out.size() > 0) {
+            out.append("-");
+        }
+
+        char buf[4];
+        size_t len = unpackLanguage(buf);
+        out.append(buf, len);
+
+        if (country[0]) {
+            out.append("-r");
+            len = unpackRegion(buf);
+            out.append(buf, len);
+        }
+        return;
+    }
+
+    // We are writing the modified bcp47 tag.
+    // It starts with 'b+' and uses '+' as a separator.
+
+    if (out.size() > 0) {
+        out.append("-");
+    }
+    out.append("b+");
+
+    char buf[4];
+    size_t len = unpackLanguage(buf);
+    out.append(buf, len);
+
+    if (localeScript[0]) {
+        out.append("+");
+        out.append(localeScript, sizeof(localeScript));
+    }
+
+    if (country[0]) {
+        out.append("+");
+        len = unpackRegion(buf);
+        out.append(buf, len);
+    }
+
+    if (localeVariant[0]) {
+        out.append("+");
+        out.append(localeVariant, sizeof(localeVariant));
+    }
+}
+
 void ResTable_config::getBcp47Locale(char str[RESTABLE_MAX_LOCALE_LEN]) const {
     memset(str, 0, RESTABLE_MAX_LOCALE_LEN);
 
@@ -2650,12 +2702,7 @@ String8 ResTable_config::toString() const {
         res.appendFormat("mnc%d", dtohs(mnc));
     }
 
-    char localeStr[RESTABLE_MAX_LOCALE_LEN];
-    getBcp47Locale(localeStr);
-    if (strlen(localeStr) > 0) {
-        if (res.size() > 0) res.append("-");
-        res.append(localeStr);
-    }
+    appendDirLocale(res);
 
     if ((screenLayout&MASK_LAYOUTDIR) != 0) {
         if (res.size() > 0) res.append("-");
diff --git a/tests/Split/res/values-b+fr+Latn+CA/strings.xml b/tests/Split/res/values-b+fr+Latn+CA/strings.xml
new file mode 100644
index 0000000000000..108a13565794b
--- /dev/null
+++ b/tests/Split/res/values-b+fr+Latn+CA/strings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="test">Bonsoir!</string>
+</resources>
diff --git a/tests/Split/res/values-fr-rCA/strings.xml b/tests/Split/res/values-fr-rCA/strings.xml
new file mode 100644
index 0000000000000..0837a68a30b66
--- /dev/null
+++ b/tests/Split/res/values-fr-rCA/strings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="test">Bonjour</string>
+</resources>
diff --git a/tools/aapt/AaptAssets.cpp b/tools/aapt/AaptAssets.cpp
index 871e04f7aa9d5..d346731e63e22 100644
--- a/tools/aapt/AaptAssets.cpp
+++ b/tools/aapt/AaptAssets.cpp
@@ -367,33 +367,6 @@ int AaptLocaleValue::initFromDirName(const Vector<String8>& parts, const int sta
     return currentIndex;
 }
 
-
-String8 AaptLocaleValue::toDirName() const {
-    String8 dirName("");
-    if (language[0]) {
-        dirName += language;
-    } else {
-        return dirName;
-    }
-
-    if (script[0]) {
-        dirName += "-s";
-        dirName += script;
-    }
-
-    if (region[0]) {
-        dirName += "-r";
-        dirName += region;
-    }
-
-    if (variant[0]) {
-        dirName += "-v";
-        dirName += variant;
-    }
-
-    return dirName;
-}
-
 void AaptLocaleValue::initFromResTable(const ResTable_config& config) {
     config.unpackLanguage(language);
     config.unpackRegion(region);
diff --git a/tools/aapt/AaptAssets.h b/tools/aapt/AaptAssets.h
index 7ae5368d80bde..4fdc9640e8e55 100644
--- a/tools/aapt/AaptAssets.h
+++ b/tools/aapt/AaptAssets.h
@@ -78,8 +78,6 @@ struct AaptLocaleValue {
 
      void writeTo(ResTable_config* out) const;
 
-     String8 toDirName() const;
-
      int compare(const AaptLocaleValue& other) const {
          return memcmp(this, &other, sizeof(AaptLocaleValue));
      }
diff --git a/tools/aapt/tests/AaptConfig_test.cpp b/tools/aapt/tests/AaptConfig_test.cpp
index ef3860c72921a..7618974db3299 100644
--- a/tools/aapt/tests/AaptConfig_test.cpp
+++ b/tools/aapt/tests/AaptConfig_test.cpp
@@ -65,7 +65,7 @@ TEST(AaptConfigTest, ParseBasicQualifiers) {
 TEST(AaptConfigTest, ParseLocales) {
     ConfigDescription config;
     EXPECT_TRUE(TestParse("en-rUS", &config));
-    EXPECT_EQ(String8("en-US"), config.toString());
+    EXPECT_EQ(String8("en-rUS"), config.toString());
 }
 
 TEST(AaptConfigTest, ParseQualifierAddedInApi13) {