diff --git a/libs/androidfw/AssetManager.cpp b/libs/androidfw/AssetManager.cpp
index 0340928..19265f6 100644
--- a/libs/androidfw/AssetManager.cpp
+++ b/libs/androidfw/AssetManager.cpp
@@ -358,6 +358,15 @@
     setLocaleLocked(locale);
 }
 
+
+static const char kFilPrefix[] = "fil";
+static const char kTlPrefix[] = "tl";
+
+// The sizes of the prefixes, excluding the 0 suffix.
+// char.
+static const int kFilPrefixLen = sizeof(kFilPrefix) - 1;
+static const int kTlPrefixLen = sizeof(kTlPrefix) - 1;
+
 void AssetManager::setLocaleLocked(const char* locale)
 {
     if (mLocale != NULL) {
@@ -366,8 +375,44 @@
         //mZipSet.purgeLocale();
         delete[] mLocale;
     }
+
+
+    // If we're attempting to set a locale that starts with "fil",
+    // we should convert it to "tl" for backwards compatibility since
+    // we've been using "tl" instead of "fil" prior to L.
+    //
+    // If the resource table already has entries for "fil", we use that
+    // instead of attempting a fallback.
+    if (strncmp(locale, kFilPrefix, kFilPrefixLen) == 0) {
+        Vector<String8> locales;
+        getLocales(&locales);
+        const size_t localesSize = locales.size();
+        bool hasFil = false;
+        for (size_t i = 0; i < localesSize; ++i) {
+            if (locales[i].find(kFilPrefix) == 0) {
+                hasFil = true;
+                break;
+            }
+        }
+
+
+        if (!hasFil) {
+            const size_t newLocaleLen = strlen(locale);
+            // This isn't a bug. We really do want mLocale to be 1 byte
+            // shorter than locale, because we're replacing "fil-" with
+            // "tl-".
+            mLocale = new char[newLocaleLen];
+            // Copy over "tl".
+            memcpy(mLocale, kTlPrefix, kTlPrefixLen);
+            // Copy the rest of |locale|, including the terminating '\0'.
+            memcpy(mLocale + kTlPrefixLen, locale + kFilPrefixLen,
+                   newLocaleLen - kFilPrefixLen + 1);
+            updateResourceParamsLocked();
+            return;
+        }
+    }
+
     mLocale = strdupNew(locale);
-    
     updateResourceParamsLocked();
 }
 
@@ -762,6 +807,16 @@
     if (res != NULL) {
         res->getLocales(locales);
     }
+
+    const size_t numLocales = locales->size();
+    for (size_t i = 0; i < numLocales; ++i) {
+        const String8& localeStr = locales->itemAt(i);
+        if (localeStr.find(kTlPrefix) == 0) {
+            String8 replaced("fil");
+            replaced += (localeStr.string() + kTlPrefixLen);
+            locales->editItemAt(i) = replaced;
+        }
+    }
 }
 
 /*