PROBLEM
- Complicated to finish a record by an app: every time when you purchase, you have to unlock the phone, slide to the icon, click it, categorize the record, and the type or capture and wait for a moment, and finally lock the phone;
- Easily forget to record when the phone is not side of hands;
- Speciffic situation like friends borrow money or some very urgent situations;
- Data record action is always later than the payment.