how to validation for minimum 3 or 4 dots to make a poper pattern

[androiddevelopemnx]

i new to app development . I need to add validation to creating a pattern with minimum 3 or 4 dots make to poper pattern. so let me know where i want to modify the code

[Kernelzero]

In my opinion, there is no function you said. I think you should implement the function with the length of the pattern entered in onComplete.