diff --git a/tools/layoutlib/bridge/src/android/os/Build_Delegate.java b/tools/layoutlib/bridge/src/android/os/Build_Delegate.java
deleted file mode 100644
index ff82a5e..0000000
--- a/tools/layoutlib/bridge/src/android/os/Build_Delegate.java
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Copyright (C) 2011 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.
- */
-
-package android.os;
-
-import com.android.layoutlib.bridge.Bridge;
-import com.android.layoutlib.bridge.impl.DelegateManager;
-import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
-
-import java.util.Map;
-
-/**
- * Delegate implementing the native methods of android.os.Build
- *
- * Through the layoutlib_create tool, the original native methods of Build have been replaced
- * by calls to methods of the same name in this delegate class.
- *
- * Because it's a stateless class to start with, there's no need to keep a {@link DelegateManager}
- * around to map int to instance of the delegate.
- *
- */
-public class Build_Delegate {
-
-    @LayoutlibDelegate
-    /*package*/ static String getString(String property) {
-        Map<String, String> properties = Bridge.getPlatformProperties();
-        String value = properties.get(property);
-        if (value != null) {
-            return value;
-        }
-
-        return Build.UNKNOWN;
-    }
-
-}
diff --git a/tools/layoutlib/bridge/src/android/os/SystemProperties_Delegate.java b/tools/layoutlib/bridge/src/android/os/SystemProperties_Delegate.java
new file mode 100644
index 0000000..c278557
--- /dev/null
+++ b/tools/layoutlib/bridge/src/android/os/SystemProperties_Delegate.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+package android.os;
+
+import com.android.layoutlib.bridge.Bridge;
+import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
+
+import java.util.Map;
+
+/**
+ * Delegate implementing the native methods of android.os.SystemProperties.
+ *
+ * Through the layoutlib_create tool, the original native methods of SystemProperties have been
+ * replaced by calls to methods of the same name in this delegate class.
+ *
+ * Because it's a stateless class to start with, there's no need to keep a {@code DelegateManager}
+ * around to map int to instance of the delegate.
+ */
+public class SystemProperties_Delegate {
+
+    @LayoutlibDelegate
+    /*package*/ static String native_get(String key) {
+        return native_get(key, null);
+    }
+
+    @LayoutlibDelegate
+    /*package*/ static String native_get(String key, String def) {
+        Map<String, String> properties = Bridge.getPlatformProperties();
+        String value = properties.get(key);
+        if (value != null) {
+            return value;
+        }
+
+        return def;
+    }
+
+    @LayoutlibDelegate
+    /*package*/ static int native_get_int(String key, int def) {
+        Map<String, String> properties = Bridge.getPlatformProperties();
+        String value = properties.get(key);
+        if (value != null) {
+            return Integer.decode(value);
+        }
+
+        return def;
+    }
+
+    @LayoutlibDelegate
+    /*package*/ static long native_get_long(String key, long def) {
+        Map<String, String> properties = Bridge.getPlatformProperties();
+        String value = properties.get(key);
+        if (value != null) {
+            return Long.decode(value);
+        }
+
+        return def;
+    }
+
+    /**
+     * Values 'n', 'no', '0', 'false' or 'off' are considered false.
+     * Values 'y', 'yes', '1', 'true' or 'on' are considered true.
+     */
+    @LayoutlibDelegate
+    /*package*/ static boolean native_get_boolean(String key, boolean def) {
+        Map<String, String> properties = Bridge.getPlatformProperties();
+        String value = properties.get(key);
+
+        if ("n".equals(value) || "no".equals(value) || "0".equals(value) || "false".equals(value)
+                || "off".equals(value)) {
+            return false;
+        }
+        //noinspection SimplifiableIfStatement
+        if ("y".equals(value) || "yes".equals(value) || "1".equals(value) || "true".equals(value)
+                || "on".equals(value)) {
+            return true;
+        }
+
+        return def;
+    }
+
+    @LayoutlibDelegate
+    /*package*/ static void native_set(String key, String def) {
+        Map<String, String> properties = Bridge.getPlatformProperties();
+        properties.put(key, def);
+    }
+
+    @LayoutlibDelegate
+    /*package*/ static void native_add_change_callback() {
+        // pass.
+    }
+}
+
diff --git a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/CreateInfo.java b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/CreateInfo.java
index f362254..5362fd79 100644
--- a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/CreateInfo.java
+++ b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/CreateInfo.java
@@ -132,7 +132,6 @@
         "android.graphics.BitmapFactory#finishDecode",
         "android.os.Handler#sendMessageAtTime",
         "android.os.HandlerThread#run",
-        "android.os.Build#getString",
         "android.text.format.DateFormat#is24HourFormat",
         "android.view.Choreographer#getRefreshRate",
         "android.view.Display#updateDisplayInfoLocked",
@@ -192,6 +191,7 @@
         "android.graphics.Typeface",
         "android.graphics.Xfermode",
         "android.os.SystemClock",
+        "android.os.SystemProperties",
         "android.text.AndroidBidi",
         "android.text.format.Time",
         "android.util.FloatMath",