diff --git a/tools/aapt/ResourceTable.cpp b/tools/aapt/ResourceTable.cpp
index a2f085a..755b93b 100644
--- a/tools/aapt/ResourceTable.cpp
+++ b/tools/aapt/ResourceTable.cpp
@@ -573,6 +573,7 @@
                         const String16& parentIdent,
                         const String16& itemIdent,
                         int32_t curFormat,
+                        bool isFormatted,
                         bool pseudolocalize,
                         const bool overwrite,
                         ResourceTable* outTable)
@@ -583,7 +584,7 @@
     String16 str;
     Vector<StringPool::entry_style_span> spans;
     err = parseStyledString(bundle, in->getPrintableSource().string(),
-                            block, item16, &str, &spans,
+                            block, item16, &str, &spans, isFormatted,
                             pseudolocalize);
     if (err != NO_ERROR) {
         return err;
@@ -616,6 +617,7 @@
                         const String16& curTag,
                         bool curIsStyled,
                         int32_t curFormat,
+                        bool isFormatted,
                         bool pseudolocalize,
                         const bool overwrite,
                         ResourceTable* outTable)
@@ -626,7 +628,7 @@
     Vector<StringPool::entry_style_span> spans;
     err = parseStyledString(bundle, in->getPrintableSource().string(), block,
                             curTag, &str, curIsStyled ? &spans : NULL,
-                            pseudolocalize);
+                            isFormatted, pseudolocalize);
 
     if (err < NO_ERROR) { 
         return err;
@@ -709,12 +711,18 @@
     // useful attribute names and special values
     const String16 name16("name");
     const String16 translatable16("translatable");
+    const String16 formatted16("formatted");
     const String16 false16("false");
 
     const String16 myPackage(assets->getPackage());
 
     bool hasErrors = false;
-    
+
+    bool fileIsTranslatable = true;
+    if (strstr(in->getPrintableSource().string(), "donottranslate") != NULL) {
+        fileIsTranslatable = false;
+    }
+
     DefaultKeyedVector<String16, uint32_t> nextPublicId(0);
 
     ResXMLTree::event_code_t code;
@@ -751,6 +759,7 @@
             bool curIsBagReplaceOnOverwrite = false;
             bool curIsStyled = false;
             bool curIsPseudolocalizable = false;
+            bool curIsFormatted = fileIsTranslatable;
             bool localHasErrors = false;
 
             if (strcmp16(block.getElementName(&len), skip16.string()) == 0) {
@@ -1136,6 +1145,7 @@
                 String8 locale(rawLocale);
                 String16 name;
                 String16 translatable;
+                String16 formatted;
 
                 size_t n = block.getAttributeCount();
                 for (size_t i = 0; i < n; i++) {
@@ -1145,11 +1155,14 @@
                         name.setTo(block.getAttributeStringValue(i, &length));
                     } else if (strcmp16(attr, translatable16.string()) == 0) {
                         translatable.setTo(block.getAttributeStringValue(i, &length));
+                    } else if (strcmp16(attr, formatted16.string()) == 0) {
+                        formatted.setTo(block.getAttributeStringValue(i, &length));
                     }
                 }
                 
                 if (name.size() > 0) {
                     if (translatable == false16) {
+                        curIsFormatted = false;
                         // Untranslatable strings must only exist in the default [empty] locale
                         if (locale.size() > 0) {
                             fprintf(stderr, "aapt: warning: string '%s' in %s marked untranslatable but exists"
@@ -1167,6 +1180,10 @@
                     } else {
                         outTable->addLocalization(name, locale);
                     }
+
+                    if (formatted == false16) {
+                        curIsFormatted = false;
+                    }
                 }
 
                 curTag = &string16;
@@ -1356,7 +1373,7 @@
                         block.getPosition(&parserPosition);
 
                         err = parseAndAddBag(bundle, in, &block, curParams, myPackage, curType,
-                                ident, parentIdent, itemIdent, curFormat, 
+                                ident, parentIdent, itemIdent, curFormat, curIsFormatted,
                                 false, overwrite, outTable);
                         if (err == NO_ERROR) {
                             if (curIsPseudolocalizable && localeIsDefined(curParams)
@@ -1365,8 +1382,8 @@
 #if 1
                                 block.setPosition(parserPosition);
                                 err = parseAndAddBag(bundle, in, &block, pseudoParams, myPackage,
-                                        curType, ident, parentIdent, itemIdent, curFormat, true,
-                                        overwrite, outTable);
+                                        curType, ident, parentIdent, itemIdent, curFormat,
+                                        curIsFormatted, true, overwrite, outTable);
 #endif
                             }
                         } 
@@ -1389,7 +1406,8 @@
                 block.getPosition(&parserPosition);
 
                 err = parseAndAddEntry(bundle, in, &block, curParams, myPackage, curType, ident,
-                        *curTag, curIsStyled, curFormat, false, overwrite, outTable);
+                        *curTag, curIsStyled, curFormat, curIsFormatted,
+                        false, overwrite, outTable);
 
                 if (err < NO_ERROR) { // Why err < NO_ERROR instead of err != NO_ERROR?
                     hasErrors = localHasErrors = true;
@@ -1400,7 +1418,8 @@
                         // pseudolocalize here
                         block.setPosition(parserPosition);
                         err = parseAndAddEntry(bundle, in, &block, pseudoParams, myPackage, curType,
-                                ident, *curTag, curIsStyled, curFormat, true, overwrite, outTable);
+                                ident, *curTag, curIsStyled, curFormat,
+                                curIsFormatted, true, overwrite, outTable);
                         if (err != NO_ERROR) {
                             hasErrors = localHasErrors = true;
                         }
diff --git a/tools/aapt/XMLNode.cpp b/tools/aapt/XMLNode.cpp
index 4c59288..57ff47a 100644
--- a/tools/aapt/XMLNode.cpp
+++ b/tools/aapt/XMLNode.cpp
@@ -68,12 +68,118 @@
     return String16(namespaceUri, namespaceUri.size()-prefixSize, prefixSize);
 }
 
+status_t hasSubstitutionErrors(const char* fileName,
+                               ResXMLTree* inXml,
+                               String16 str16)
+{
+    const char16_t* str = str16.string();
+    const char16_t* p = str;
+    const char16_t* end = str + str16.size();
+
+    bool nonpositional = false;
+    int argCount = 0;
+
+    while (p < end) {
+        /*
+         * Look for the start of a Java-style substitution sequence.
+         */
+        if (*p == '%' && p + 1 < end) {
+            p++;
+
+            // A literal percent sign represented by %%
+            if (*p == '%') {
+                p++;
+                continue;
+            }
+
+            argCount++;
+
+            if (*p >= '0' && *p <= '9') {
+                do {
+                    p++;
+                } while (*p >= '0' && *p <= '9');
+                if (*p != '$') {
+                    // This must be a size specification instead of position.
+                    nonpositional = true;
+                }
+            } else if (*p == '<') {
+                // Reusing last argument; bad idea since it can be re-arranged.
+                nonpositional = true;
+                p++;
+
+                // Optionally '$' can be specified at the end.
+                if (p < end && *p == '$') {
+                    p++;
+                }
+            } else {
+                nonpositional = true;
+            }
+
+            // Ignore flags and widths
+            while (p < end && (*p == '-' ||
+                    *p == '#' ||
+                    *p == '+' ||
+                    *p == ' ' ||
+                    *p == ',' ||
+                    *p == '(' ||
+                    (*p >= '0' && *p <= '9'))) {
+                p++;
+            }
+
+            /*
+             * This is a shortcut to detect strings that are going to Time.format()
+             * instead of String.format()
+             *
+             * Comparison of String.format() and Time.format() args:
+             *
+             * String: ABC E GH  ST X abcdefgh  nost x
+             *   Time:    DEFGHKMS W Za  d   hkm  s w yz
+             *
+             * Therefore we know it's definitely Time if we have:
+             *     DFKMWZkmwyz
+             */
+            if (p < end) {
+                switch (*p) {
+                case 'D':
+                case 'F':
+                case 'K':
+                case 'M':
+                case 'W':
+                case 'Z':
+                case 'k':
+                case 'm':
+                case 'w':
+                case 'y':
+                case 'z':
+                    return NO_ERROR;
+                }
+            }
+        }
+
+        p++;
+    }
+
+    /*
+     * If we have more than one substitution in this string and any of them
+     * are not in positional form, give the user an error.
+     */
+    if (argCount > 1 && nonpositional) {
+        SourcePos(String8(fileName), inXml->getLineNumber()).error(
+                "Multiple substitutions specified in non-positional format; "
+                "did you mean to add the formatted=\"true\" attribute?\n");
+        return NOT_ENOUGH_DATA;
+    }
+
+    return NO_ERROR;
+}
+
 status_t parseStyledString(Bundle* bundle,
                            const char* fileName,
                            ResXMLTree* inXml,
                            const String16& endTag,
                            String16* outString,
                            Vector<StringPool::entry_style_span>* outSpans,
+                           bool isFormatted,
                            bool pseudolocalize)
 {
     Vector<StringPool::entry_style_span> spanStack;
@@ -101,7 +207,11 @@
                 std::string pseudo = pseudolocalize_string(orig);
                 curString.append(String16(String8(pseudo.c_str())));
             } else {
-                curString.append(text);
+                if (isFormatted && hasSubstitutionErrors(fileName, inXml, text) != NO_ERROR) {
+                    return UNKNOWN_ERROR;
+                } else {
+                    curString.append(text);
+                }
             }
         } else if (code == ResXMLTree::START_TAG) {
             const String16 element16(inXml->getElementName(&len));
diff --git a/tools/aapt/XMLNode.h b/tools/aapt/XMLNode.h
index e9a263b..05624b7 100644
--- a/tools/aapt/XMLNode.h
+++ b/tools/aapt/XMLNode.h
@@ -25,6 +25,7 @@
                            const String16& endTag,
                            String16* outString,
                            Vector<StringPool::entry_style_span>* outSpans,
+                           bool isFormatted,
                            bool isPseudolocalizable);
 
 void printXMLBlock(ResXMLTree* block);