Flutter: How to generate random boolean value with my own probability?

Question

When I use the code :

Random r = new Random();
r.nextBool();

It returns a 50% / 50% probability value (true / false).

How can I generate a true-false value with my own probability like (20% / 35% / 70% ...)?

Answer 1

Simpler example:

Random r = new Random();
bool result = r.nextDouble() <= 0.7;

Gives a chance of 70% to get True result.