Android-Programm / " calculator app" / "android studio" Please read the question carefully, I am posting it for the thir

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Android-Programm / " calculator app"
/ "android studio"
Please read the question carefully, I am posting it for
the third time, but I am getting the wrong answer.
THE TASK:
Topics: Activity, Views & Viewgroups, Event Handling
part 1:
A calculator app is to be created with which simple calculations
can be made
can be carried out.
• The app should at least do basic arithmetic addition,
subtraction,
Support multiplication and division.
• It should also be possible to use more than two operands and more
than one
enter operator, as well as that
• Result of the calculation as an operand for the next
calculation
use.
• The app should use both the infix notation (3 +4 = 7) and
the
Support reverse Polish notation ( 3 4 + = 7).
• Errors (3 / 0) should lead to an "ERROR" message in the
display.
For the development of the app, the view and View Group elements
are used.
A notice: The focus of this exercise is not on the evaluation of
mathematical expressions,
but on the development of a functional interface. For this
reason
can use an external library for evaluating and calculating the
expressions.
Part 2:
The calculator app (part 1) is to be expanded. The additional
arithmetic operations sine, cosine, tangent and square root should
be selectable in a submenu via a menu with the entry "Other".
The keypad is to be extended by the keys [C] (deletes all entries)
and [CE] (deletes the last entry).
In addition, the app is to be optimized for two different layouts,
on the one hand for a smartphone (default layout) and on the other
hand for a tablet (approx. 7" - 10").
It must be ensured that there is more space available on the tablet
than on a smartphone, so that the above-mentioned additional
arithmetic operations in the tablet version do not have to be made
available via a menu, but can be displayed directly.