diff --git a/runtime/native/java_lang_StringFactory.cc b/runtime/native/java_lang_StringFactory.cc
new file mode 100644
index 0000000..34d6a37
--- /dev/null
+++ b/runtime/native/java_lang_StringFactory.cc
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "java_lang_StringFactory.h"
+
+#include "common_throws.h"
+#include "jni_internal.h"
+#include "mirror/object-inl.h"
+#include "mirror/string.h"
+#include "scoped_fast_native_object_access.h"
+#include "scoped_thread_state_change.h"
+#include "ScopedLocalRef.h"
+#include "ScopedPrimitiveArray.h"
+
+namespace art {
+
+static jstring StringFactory_newStringFromBytes(JNIEnv* env, jclass, jbyteArray java_data,
+                                                jint high, jint offset, jint byte_count) {
+  ScopedFastNativeObjectAccess soa(env);
+  if (UNLIKELY(java_data == nullptr)) {
+    ThrowNullPointerException("data == null");
+    return nullptr;
+  }
+  StackHandleScope<1> hs(soa.Self());
+  Handle<mirror::ByteArray> byte_array(hs.NewHandle(soa.Decode<mirror::ByteArray*>(java_data)));
+  int32_t data_size = byte_array->GetLength();
+  if ((offset | byte_count) < 0 || byte_count > data_size - offset) {
+    soa.Self()->ThrowNewExceptionF("Ljava/lang/StringIndexOutOfBoundsException;",
+                                   "length=%d; regionStart=%d; regionLength=%d", data_size,
+                                   offset, byte_count);
+    return nullptr;
+  }
+  gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
+  mirror::String* result = mirror::String::AllocFromByteArray<true>(soa.Self(), byte_count,
+                                                                    byte_array, offset, high,
+                                                                    allocator_type);
+  return soa.AddLocalReference<jstring>(result);
+}
+
+static jstring StringFactory_newStringFromChars(JNIEnv* env, jclass, jint offset,
+                                                jint char_count, jcharArray java_data) {
+  ScopedFastNativeObjectAccess soa(env);
+  StackHandleScope<1> hs(soa.Self());
+  Handle<mirror::CharArray> char_array(hs.NewHandle(soa.Decode<mirror::CharArray*>(java_data)));
+  gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
+  mirror::String* result = mirror::String::AllocFromCharArray<true>(soa.Self(), char_count,
+                                                                    char_array, offset,
+                                                                    allocator_type);
+  return soa.AddLocalReference<jstring>(result);
+}
+
+static jstring StringFactory_newStringFromString(JNIEnv* env, jclass, jstring to_copy) {
+  ScopedFastNativeObjectAccess soa(env);
+  if (UNLIKELY(to_copy == nullptr)) {
+    ThrowNullPointerException("toCopy == null");
+    return nullptr;
+  }
+  StackHandleScope<1> hs(soa.Self());
+  Handle<mirror::String> string(hs.NewHandle(soa.Decode<mirror::String*>(to_copy)));
+  gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
+  mirror::String* result = mirror::String::AllocFromString<true>(soa.Self(), string->GetLength(),
+                                                                 string, 0, allocator_type);
+  return soa.AddLocalReference<jstring>(result);
+}
+
+static JNINativeMethod gMethods[] = {
+  NATIVE_METHOD(StringFactory, newStringFromBytes, "!([BIII)Ljava/lang/String;"),
+  NATIVE_METHOD(StringFactory, newStringFromChars, "!(II[C)Ljava/lang/String;"),
+  NATIVE_METHOD(StringFactory, newStringFromString, "!(Ljava/lang/String;)Ljava/lang/String;"),
+};
+
+void register_java_lang_StringFactory(JNIEnv* env) {
+  REGISTER_NATIVE_METHODS("java/lang/StringFactory");
+}
+
+}  // namespace art