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I am making a calculator app and want to update history in second fragment but not able to find a perfect solution for updating ListView in second fragment. I tried many solutions but none of them worked properly. I'm using ViewPager to swipe between calculator and history fragments. I tired bundle class but if I use bundle in OnCreat method of first Fragment(CalculatorFragment) with ViewPager it shows me blank screen after starting an App & if I use Bundle class in Equal Button it crashes app. here I am passing id of viewPager as Container of fragments.

I seen many answer perfectly working when they are using Framelayout for the container of Fragments but I want to keep swipe functionality of ViewPager, I tried many solutions but none of them worked properly with ViewPger, I added SharedPreferences to my code but it is not updating (not live) when I am using calculator. SharedPreferences seemed to work but they are not updating History when App is Running And When I restart the app it shows me my last Calculation in History Fragment.

I passed SharedPreferences and fetch the string in onResume/onStart method's of second fragment(History fragment) but it only shows the history of last calculation when I closed my application

I am using Custom ArrayList to Store and display my History output in History Fragment.

I want to pass data(calculation to show history) to HistoryFragment whenever anyone clicks "=" button in application. "=" button calls the equal method in calculator app.

Example of what is happening if I do this calculation in my calculator it does not update

and in History it shows that last one from last when I closed application

here's what I have done so far

it is the code of saving answer in CalculatorFragment.java(first fragment) using SharedPreferences

I am also confused about which one to use .appy() or .commit()

// my program is working fine no error, also color works fine when changing toolbars color. but sharedpreferences is not working for color , it is not able to save the changed color. after changing the color of toolbar when i restart app again after closing it. it start with default color, i am not able to save by using shared preferences.//

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