implement the functionality of a calculator app with the UI given. please see the pdf file below for this.

Building on your previous assignment, implement the functionality of a calculator app with the UI below (again, no need for the menu). This is the UI of the scientific calc app in MS Windows. The functionalities that have been outlined in red need not be implemented. In addition, provide a “history” button in the calculator app that will take the user to a new activity, which will display a history of all computations and events such as below: 2*7 = 14 (20+30)*2+21 = 121 Memory save: 100 5^2 = 25 Memory cancel. Note that the activity can get destroyed at any time. So make sure to store the data when the user uses the memory functions such as MS, M+ and M- such that you can recover the data when the activity is created again. Also, you need to save the history and recover across multiple create-destroy cycles.