please look into the video to understand that one person will have access to view or manipulate the data, other users will only enter the data, admin can view in his app the details and can download as xl sheet or pdf. the bid should be very low budget and convenient with NDA.
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Hey i will need to speak with you, but i can do that. you want a calculator in android using java for that i will make a database for save the information that you use in your work.
You have to give me full description about what exactly you want. I will design as per your requirements. I have experience of working as Android developer for 2 years so i can create your requirements into an App.