MainApplication.java

public class MainApplication extends NavigationApplication {

    @Override
    public boolean isDebug() {
        // Make sure you are using BuildConfig from your own application
        return BuildConfig.DEBUG;
    }

    protected List<ReactPackage> getPackages() {
        // Add additional packages you require here
        // No need to add RnnPackage and MainReactPackage
        return Arrays.<ReactPackage>asList(
                //new MainReactPackage()
                //your react package here
        );
    }

    @Override
    public List<ReactPackage> createAdditionalReactPackages() {
        return getPackages();
    }

    @Override
    public void onCreate() {
        super.onCreate();

        registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
            @Override
            public void onActivityCreated(Activity activity, Bundle savedInstanceState) {

            }

            @Override
            public void onActivityStarted(Activity activity) {
                if (activity instanceof NavigationActivity) {
                    activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON 
                    | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
                }
            }

            @Override
            public void onActivityResumed(Activity activity) {
                if (activity instanceof NavigationActivity && NavigationApplication.instance.getReactGateway().isInitialized()) {
                    Intent i = new Intent(activity, IncomingCallScreenActivity.class);
                    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
                    startActivity(i);
                }
            }

            @Override
            public void onActivityPaused(Activity activity) {

            }

            @Override
            public void onActivityStopped(Activity activity) {

            }

            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {

            }

            @Override
            public void onActivityDestroyed(Activity activity) {

            }
        });
    }
}