create an android app

The working of the app should be like below: 1. I should be able to enter a start date and end date (Ds and De) 2. I should be able to enter an end amount (Ia). 3. The app should calculate the number of days between the two date and divide it by the amount and show me the amount on per day basis (Dn). 4. This should show in a progress bar. 5. A field to enter the amount manually (Ic). 6. When the enter the amount in the field, it should be subtracted by the initial amount. The new amount should be divided by the number of days remaining. Ia- Ic = Ir Ir/Dnn = XXX 7. This data should be saved i.e. if I close and re-open the app, the data should be present. Rough image added. The last 2 rectangle is a progress bar for amount and days.