CastStateListner not getting called in fragment

[wahdatjan]

CaststateListener not getting called in Fragment.
i am calling it in onresume . when fragment starts nothing happen during onresume .But when app goes in background so onstop is being called then coming back to foreground onresume is being called , at that time listner works .
` @OverRide
public void onResume() {
super.onResume();
castContext.addCastStateListener(new CastStateListener() {
@OverRide
public void onCastStateChanged(int i) {
if (i == CastState.NO_DEVICES_AVAILABLE){
mediaRouteButton.setVisibility(View.GONE);
}
else {
mediaRouteButton.setVisibility(View.VISIBLE);
}

            if (CastState.CONNECTED == i){
                EventTrackingManager.getEventTrackingManager(mContext).trackClickedItem(TrackingEvents.CHROMECAST_CONNECTED,null);
            }
        }
    });

}`