React Native and Android Native merged boilerplate

In this repo you can have a React Native app and a basic Android app. Using this repo you can add multiple android native intent or activity to your react native app. just simply open the android folder with your android studio and use the folder as your android native app and the root as your react native app

Pre Environment or setup

1. JDK 1.8 or higher
2. JAVA_HOME path setup correctly.
3. Android Studio installed and running.

**for all kind of environment edit like adding path and installing node, restart your ide.

How to use the repo?

1. Simply clone the repo or download it.
2. Open the android folder with Android Studio
3. Open the root folder with any IDE like Visual Code, Pycharm, WebStorm,
4. run npm install or yarn install from the root of the repo.
5. Now run react-native run-android then run react-native start if you get any error like debug.keystore not found or SDK dir not found then.
6. Create local.properties file inside android folder and write

sdk.dir = your sdk dir

7. run this command

keytool -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000

for debug.keystore if needed and move it to app folder under android folder

8. Finally run react-native run-android

9. And run react-native start

10. if react-native start is giving Invalid regular expression invalid error check node.js version and install version 10

11. if adb is not found then add the path <YOUR_SDK_LOCATION>\platform-tools in environment variables

How to add Android Native Activity

1. Open the android folder with Android Studio
2. Now create an empty activity eg. My one I named as BasicModule
3. Now Extend ReactContextBaseJavaModule overrride and rearrange it all the required methods like bellow

public class BasicModule extends ReactContextBaseJavaModule {

    ReactApplicationContext context = getReactApplicationContext();

    public BasicModule(@Nonnull ReactApplicationContext reactContext) {
        super(reactContext);
    }

    @Nonnull
    @Override
    public String getName() {
        return "MyModule";
    }


    @ReactMethod
    public void NavigateMe(){
        Intent intent = new Intent(context, NavigationDrawerActivity.class);
        if(intent.resolveActivity(context.getPackageManager()) != null){
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(intent);
        }
    }
}

Your activity is now having a NavigationDrawer you can do whatever you need.

4. Now goto MyModulePackage.java and add your actvity like this bellow

modules.add(new BasicModule(reactContext));

Full code is here

public class MyModulePackage implements ReactPackage {
    @Nonnull
    @Override
    public List<NativeModule> createNativeModules(@Nonnull ReactApplicationContext reactContext) {
        List <NativeModule> modules = new ArrayList();
        modules.add(new BasicModule(reactContext));
        //add more here
        return modules;
    }

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

In this way add how many activities you need.

How to use it in React Native

1. Import NativeModules

import {StyleSheet, View, Text, Button, NativeModules} from 'react-native';

2. Use it like

NativeModules.MyModule.NavigateMe();

here NavigateMe() is the @ReactMethod that we defined in our activity BasicModule

Now whenever the code will call the function NavigateMe() it will activate the android native activity Basic Module

Happy Coding