Importing a Native Bridge module into javascript in React Native

Question

I'd like to import my module written natively (java, Android) into my React Native sources, in JS.

I have my dependencies loaded into: android/app/libs/dependencies.jar I have created my module into android/app/src/main/java/com/rctcognito/:

Beside some source files, I have the module and the package.

The module is implementing the following class: public class Cognito extends ReactContextBaseJavaModule

And here is the package class:

package com.rctcognito;

import com.facebook.react.ReactPackage;
import com.facebook.react.bridge.JavaScriptModule;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.uimanager.ViewManager;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class RCTCognitoPackage implements ReactPackage {

    @Override
    public List<Class<? extends JavaScriptModule>> createJSModules() {
            return Collections.emptyList();
    }

    @Override
    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
            return Collections.emptyList();
    }

    @Override
    public List<NativeModule> createNativeModules( ReactApplicationContext reactContext) {
            List<NativeModule> modules = new ArrayList<>();
            modules.add(new Cognito(reactContext));
            return modules;
    }
}

I, then, updated MainApplication.java by adding the new package: import com.rctcognito.RCTCognitoPackage; And adding it in the List: new RCTCognitoPackage(),

Considering to the official doc of React-Native, I should be able to load it like this:

import { NativeModules } from 'react-native';
module.exports = NativeModules.Cognito;
import Cognito from './Cognito';

But my app is not able to load ./Cognito. Would you have any idea what I might be doing wrong please? Thanks a lot!

Andreyco · Accepted Answer · 2017-01-08 00:09:44Z

2

That's not how it works.

All native modules are exposed via NativeModules submodule provided by React Native.

This is correct usage.

import { NativeModules } from 'react-native';

const { Cognito } = NativeModules;

Go ahead and do simple console.log(NativeModules) to see, what's exposed from native codebase.

answered Jan 8, 2017 at 0:09

Andreyco

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Abhishek Nalwaya · Accepted Answer · 2019-01-02 04:35:56Z

0

There are two ways to do that:

Create a file Cognite.js

import {NativeModules} from 'react-native';
module.exports = NativeModules.Cognite;

And then import it where you needed by:

import Cognite from './Cognite';

Another way is to just import directly:

import { NativeModules } from 'react-native';

const { Cognito } = NativeModules;

You can check out React Native Bridge which works in both iOS and Android -> https://medium.com/@abhisheknalwaya/react-native-bridge-for-ios-and-android-43feb9712fcb

answered Jan 2, 2019 at 4:35

Abhishek Nalwaya

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