AlertDialog.Builder This class generates AlertDialog based on configuration.
AlertDialog can only be displayed and has the dimiss method.
The result generated by Builder is Builder. If the create or show method is not called, no AlertDialog will be generated.

I suggest you post the code, it’s hard to understand!

Same as above, the description is a bit vague, not sure what you want to say

Form leakage, it should be that the dialog still holds the Activity's Context, and you closed the Activity directly. Please post the specific code

Builder is just a parameter to construct the class.
Call builder's build() to actually construct an instance of the class.
In your case, you need to declare a Dialog to receive it, so that you have a chance to call the dismiss() method.

You must first build.create() to create an alertdialog, and then you can use alertdialog.show() and alertdialog.dismiss()

Is the context you pass in the activity's context or the application's context? If it is the application's context, a similar error will occur. You need to give the dialog an attached window before it can be displayed