Write an Android application

The goal of this app is a field invoicing and record keeping tool for a pest control business. I want to create an Android app for my pest control business (not a customer facing app). Strictly for my own invoicing and record keeping. I already have invoicing software, but it goes through the cloud and is too slow in the field. I would like an app that syncs with my google contacts. I can search by name, etc. and select the customer from the google contacts. Then a space to write total due and total balance (default the same). Then I have a scroll windows to select pesticide used (I must be able to add to this, delete, edit, etc). Then it has pest targeted: ideally a new screen or tab with "boxes" with the names of all pests. I just select the target pests, example ants, spiders, crickets - then hit next. Area treated: Same thing a new "tab" with a grid of boxes where I can pick descriptive words like "barrier around base of home" "around windows" etc. Can select up to five pesticides and each time go through this but default is one. Also going to have a scroll windows for each pesticide amount of undiluted pesticide and amount of final mix (this is hidden on the invoice). Finally I would like to print this in the field so there is a print button at the bottom. Ideally very customizable because I would like to try smaller than legal size paper, and maybe preprinted invoices where all that is getting printed is address, total due, and pesticide report. (Other things like logo and boxes etc pre-printed). I also want each service to create a list of each day for my own records, like each invoice I print a digital copy made, but preferably in list form. So like "Tues. May 9" has a list of the address I visited and chemicals applied. (no need to record money on this list) Final Bonus if I can create a spreadsheet with all my chemicals in it, and when I use 2 oz of some chemical it adjusts the spreadsheet automatically under that chemical and I can print these out each month. Damn this seems complicated now that I type it out, I would definitely try to create some graphics to explain what I am expecting. Please let me know if you can help