Crash with ExpoKit

Hi ! I encountered so much problems integrating this library with expokit, but now, i’m really close of it ! I don’t have any problems with iOS but Android drives me mad.

When I receive an notification on Android, it’ll instantly crash with this error java.lang.NullPointerException: Attempt to invoke virtual method 'com.facebook.react.ReactInstanceManager com.facebook.react.ReactNativeHost.getReactInstanceManager()' on a null object reference

because of this line ReactInstanceManager mReactInstanceManager = ((ReactApplication) getApplication()).getReactNativeHost().getReactInstanceManager();

My MainApplication class is like this:

package com.productinuse.preprod;

import android.support.multidex.MultiDexApplication;

import com.facebook.react.ReactPackage;

import java.util.Arrays;
import java.util.List;

import com.evollu.react.fcm.FIRMessagingPackage;

public class MainApplication extends MultiDexApplication {
  public List<ReactPackage> getPackages() {
    return Arrays.<ReactPackage>asList(
        // Add your own packages here!
        new FIRMessagingPackage()
    );
  }
}

It doesn’t implement ReactApplication because of the ExpoKit implementation.

I already see this and this without any solutions

react-native-fcm: 7.5.1 expokit: sdk 19 @evollu I mention you because I’m really desperate aha 😉

[amanforindia]

For others trying to configure it, I got it to work by changing MessagingService:

Handler handler = new Handler(Looper.getMainLooper());
        handler.post(new Runnable() {
            public void run() {
                // Construct and load our normal React JS code bundle
                ReactInstanceManager mReactInstanceManager = ((ReactApplication) getApplication()).getReactNativeHost().getReactInstanceManager();

last line changed to :

ReactInstanceManager mReactInstanceManager = ((MainActivity)Exponent.getInstance().getCurrentActivity()).getReactInstanceManager();

Where I added a method in MainActivity (which extends ExponentActivity) like:

  public ReactInstanceManager getReactInstanceManager() {
    return (ReactInstanceManager) mReactInstanceManager.get();
  }

Not sure if this can be be done with PR or not.

[anish000kumar]

@amanforindia Can you please share the imports used in your snippet? Currently, it highlights (MainActivity)Exponent in red for me, saying unable to resolve symbol