You why you would need that. I used it to detect if screen mirroring is on or not. If length of displays is greater than 1 then screen mirroring is on else not. It’s not hundred percent upto the mark. May be we can use the MediaRouter API too. I haven’t gone through that much but you added some listeners on route changes. Visit for more: Android | MediaRouter add listeners – FaltuTech.Com

@ReactMethod
    public void getDisplayCount(Promise promise) {
        try {
            if (this._displayManager == null) {
                this._displayManager = (DisplayManager) this.reactContext.getSystemService(Context.DISPLAY_SERVICE);
            }
            Display[] displays = _displayManager.getDisplays();
            promise.resolve(displays.length);
        } catch (Exception e) {
            promise.reject("No displays found", e);
        }
    }

Cheers and Peace out!!!