diff --git a/src/com/android/gallery3d/app/GalleryActivity.java b/src/com/android/gallery3d/app/GalleryActivity.java
new file mode 100644
index 0000000..02f2f72
--- /dev/null
+++ b/src/com/android/gallery3d/app/GalleryActivity.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2010 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 com.android.gallery3d.app;
+
+import com.android.gallery3d.ui.GLRoot;
+import com.android.gallery3d.ui.PositionRepository;
+
+public interface GalleryActivity extends GalleryContext {
+    public StateManager getStateManager();
+    public GLRoot getGLRoot();
+    public PositionRepository getPositionRepository();
+    public GalleryApp getGalleryApplication();
+    public GalleryActionBar getGalleryActionBar();
+}