React Native (Android Native Module): Get access to ReactContext in another Class?

Question

I want to call a method in MyCustomModuleClass extends ReactContextBaseJavaModule from another Class

MyCustomModule.java

public class MyCustomModule extends ReactContextBaseJavaModule {

  private ReactContext mReactContext;

  public MyCustomModule(ReactApplicationContext reactContext) {
    super(reactContext);
    mReactContext = reactContext;
  }

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


    private void sendEvent(String eventName, Object params) {
        mReactContext
            .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
            .emit(eventName, params);
    }    
}

I'm trying this..

OtherClass.java

public class OtherClass extends AnotherClass {

    @Override
    protected void eventOccurred(Context context) {
        MyCustomModule RNC = new MyCustomModule(?);//-> Can't call without ReactContext
        RNC.sendEvent("CustomEvent", ObjectData); 
    }   
}

Sorry, I know nothing about java, could any one please help me out?

Is there any way I can get ReactContext in OtherClass?

It does not look like your calling a valid constructor on MyCustomModule. Maybe thats just a typo you made when trying to create a simple example. I don't see why you could not do that. Just try it. — startoftext
– startoftext, Commented Feb 18, 2016 at 16:04
I solved my problem by another way, using LocalBroadcastManager. — antihate
– antihate, Commented Feb 19, 2016 at 12:43
@antihate - Would you mind sharing your solution? This problem is driving me nuts.. — Justin Finkelstein
– Justin Finkelstein, Commented Nov 1, 2016 at 17:41
this question got more feed back in the issues: github.com/facebook/react-native/issues/5846 — Ali Ghanavatian
– Ali Ghanavatian, Commented Apr 29, 2018 at 6:54

reflexgravity · Accepted Answer · 2019-11-19 11:13:19Z

8

Here's how I did it in a FirebaseMessagingService extended class.

public class MyPushListener extends FirebaseMessagingService {

  @Override
  public void onMessageReceived(JSONObject message, JSONObject content){

    MainApplication application = (MainApplication) this.getApplication();

    ReactNativeHost reactNativeHost = application.getReactNativeHost();
    ReactInstanceManager reactInstanceManager = reactNativeHost.getReactInstanceManager();
    ReactContext reactContext = reactInstanceManager.getCurrentReactContext();

    if (reactContext != null) {
      WritableNativeArray params = new WritableNativeArray();
      params.pushString(message.toString());
      reactContext.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
          .emit("EVENT_HAS_TRIGGERED", params);
    }
  }
}

Source

answered Nov 19, 2019 at 11:13

reflexgravity

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1 Comment

Satheesh Over a year ago

I also did this but with RN 0.71.8 I see this warning for getCurrentReactContext();` This method should only be accessed from tests or within private scope`

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