Implement lazy discovery for ViewManagers.

Reviewed By: kathryngray

Differential Revision: D5865095

fbshipit-source-id: c94970e4cd7aafb20cf844c48feea053ac8b6b0f

ReactAndroid/src/main/java/com/facebook/react/ViewManagerOnDemandReactPackage.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react;
+
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.uimanager.ViewManager;
+import java.util.List;
+import javax.annotation.Nullable;
+
+public interface ViewManagerOnDemandReactPackage {
+  /**
+   * Provides a list of names of ViewManagers with which these modules can be accessed from JS.
+   * Typically, this is ViewManager.getName().
+   */
+  List<String> getViewManagerNames(ReactApplicationContext reactContext);
+  /**
+   * Creates and returns a ViewManager with a specific name {@param viewManagerName}. It's up to
+   * an implementing package how to interpret the name.
+   */
+  @Nullable ViewManager createViewManager(ReactApplicationContext reactContext, String viewManagerName);
+}