Write an Android application

i want to get made a software wherein my clients can get my stock details on their phones whenever they want. basically i want to make my stock details available to my clients in real time. this is how i want it to work. u can suggest more from ur end too. Entry page - one time after every installation or app launch. -Company Name -Your name -Mobile number 1st page -Search by Diameter -Search by Serial Number -Calculate weight -Convert Search by Diameter -Client inputs diameter in mm. Then the app throws up data matching the diameter. If not then throws up results of diameters which are nearest to the demanded diameter. The result will be in colums of - Serial No, Diameter, Length, ID, C, Cr, Mo, Ni, Mn, Type, Remarks & If possible a pic for every material. We would keep updating our data everyday on sale purchase basis. Whatever will be sold will be deleted and the app will not show it up in results. Search by Serial Number -All our materials have a serial number. Clients inputs a material's serial number which he might know or we would have told him so that he can check the full details of the material of which the client have input the serial number. Then the app throws up the data of the material corresponding the serial number. The result will be in colums of - Serial No, Diameter, Length, ID, C, Cr, Mo, Ni, Mn, Type, Remarks & If possible a pic for every material. We would keep updating our data everyday on sale purchase basis. Whatever will be sold will be deleted and the app will not show it up in results. Calculate weight -Round/Cylinder -Flat/Plate On clicking Round/Cylinder the client gets to enter dia, id, length and he gets the result of weight in kilograms. Backend programm will workout the formula and get the result on the same page below. On clicking Flat/Plate the client gets to enter Width, Thickness, length and he gets the result of weight in kilograms. Backend programm will workout the formula and get the result on the same page below. Convert -Inches to mm -Foot/Feet to mm Do let me know if u have any other ideas I want to do sumthing which no one have even tried in my field. i am working to think of adding more options. I want to get the app on all operating systems - android, i os, windows phone. let me know what can be done and what else do u need from me.