show discount percent of product in Text Widget in flutter

Question

I want to show amount of discount percent in Text widget in flutter, i used the Discount calculation formula but it didn't worked , How can i do that? this is what i want:

Container(
  decoration: BoxDecoration(
  color: Color(0xfff40725),
  borderRadius: BorderRadius.circular(50),
),

child: Padding(
  padding: const EdgeInsets.all(5.0),
  child: Text(
    '50% (but with formula',
    style: TextStyle(
      color: Colors.white, 
      fontWeight: FontWeight.bold),
    ),
  ),
),

you can calculate using formula in any variable and then print in text widget with the help of toString method. — Viren V Varasadiya, Jan 17 '20 at 08:24
No , It's static text i want show the percent by formula, For example like this: Text((old_price-new-price)/new-price*100); — Mehrdad Hosseini, Jan 17 '20 at 08:30
(Data to found the percent * 100) / Sum of your all data e.g [3,7,1] i want to find the percent of 7 (7*100) / 3+7+1 — Murat Aslan, Jan 17 '20 at 08:34

score 3 · Accepted Answer · answered Jan 17 '20 at 09:53

3

You can use string substitution.

Text("${your_formula()}%")

answered Jan 17 '20 at 09:53

Mikołaj Kojdecki

86
6

Thanks but where i can use the formula? when i try to defined it , i got this error: Only static members can be accessed in initializers, what does this mean? – Mehrdad Hosseini Jan 17 '20 at 10:01
I think I'd need to see more code to be able to help you with this. See here for how it works: https://dartpad.dev/953579e821cc2c5ddebee07e4fe0894f – Mikołaj Kojdecki Jan 20 '20 at 10:59

show discount percent of product in Text Widget in flutter

1 Answers1