$ npm install react-native-moengage
$ react-native link

include ':react-native-moengage'
project(':react-native-moengage').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-moengage/android')

dependencies {
    ...

    compile project(':react-native-moengage')
}

public class MainApplication extends Application implements ReactApplication {

  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
    @Override
    protected boolean getUseDeveloperSupport() {
      return BuildConfig.DEBUG;
    }

    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          new MainReactPackage(), new MoEReactPackage());
    }
  };

  @Override public void onCreate() {
    super.onCreate();
    MoEHelper.getInstance(getApplicationContext()).autoIntegrate(this);
  }

  @Override
  public ReactNativeHost getReactNativeHost() {
      return mReactNativeHost;
  }
}

import com.moengage.react.MoEReactPackage;