使用Firebase Database android恢复活动时，Recycler查看更新

I am trying to make a Blog App in android for my portfolio and I am having a problem. When I open the app the recycler view does not show anything but when I press the back button and open the app it updates the recycler view and this problem I am facing when running the app on real device I have tried running them in two emulators one is Nexus 5 and another Pixel 2 and they work fine and load the recycler view in first attempt only.I am trying to make a Blog App in android for m