Can I make an app for using Office 365 on Android mobile

I got a position as a developer in a company.
The company uses [COLOR="#000000"]Office 365 Business Premium for internal office purposes.
The employees need to use Office 365 plan on their android smartphones as well.
I know that Microsoft has not come up with an app for that.
Is there a way I can create an app to solve this problem?
How should I go about to build such an app?

Recommendations would be helpful.
Thanks in advance.
Abigail[/COLOR]

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I am also interested in the answer to this question.

I am also interested in the answer to this question.