Release React Native for Android

This is an early release and there are several things that are known
not to work if you're porting your iOS app to Android.

See the Known Issues guide on the website.

We will work with the community to reach platform parity with iOS.

ReactAndroid/src/main/java/com/facebook/react/bridge/NativeModule.java

@@ -0,0 +1,57 @@
+/**
+ * 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.bridge;
+
+import java.io.IOException;
+import java.util.Map;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+
+/**
+ * A native module whose API can be provided to JS catalyst instances.  {@link NativeModule}s whose
+ * implementation is written in Java should extend {@link BaseJavaModule} or {@link
+ * ReactContextBaseJavaModule}.  {@link NativeModule}s whose implementation is written in C++
+ * must not provide any Java code (so they can be reused on other platforms), and instead should
+ * register themselves using {@link CxxModuleWrapper}.
+ */
+public interface NativeModule {
+  public static interface NativeMethod {
+    void invoke(CatalystInstance catalystInstance, ReadableNativeArray parameters);
+  }
+
+  /**
+   * @return the name of this module. This will be the name used to {@code require()} this module
+   * from javascript.
+   */
+  public String getName();
+
+  /**
+   * @return methods callable from JS on this module
+   */
+  public Map<String, NativeMethod> getMethods();
+
+  /**
+   * Append a field which represents the constants this module exports
+   * to JS.  If no constants are exported this should do nothing.
+   */
+  public void writeConstantsField(JsonGenerator jg, String fieldName) throws IOException;
+
+  /**
+   * This is called at the end of {@link CatalystApplicationFragment#createCatalystInstance()}
+   * after the CatalystInstance has been created, in order to initialize NativeModules that require
+   * the CatalystInstance or JS modules.
+   */
+  public void initialize();
+
+  /**
+   * Called before {CatalystInstance#onHostDestroy}
+   */
+  public void onCatalystInstanceDestroy();
+}