When you try to give another value to the 3rd argument in Toast.makeText
other than Toast.LENGTH_LONG
or Toast.LENGTH_SHORT
it won't accept.
I need to create a method and use the same type of restriction: it can only be accepted three values which I'll define previously using constants.
How can this be accomplished?
You can restrict the user by creating your own enum. Sample code:
public enum Notification {
LONG,
SHORT
}
Method which I want to restrict:
private void methodName(String value1, Notification value2){
// Write whatever you want to perform
}
Now, this method can only be called like:
methodName("", Notification.LONG); // Second Parameter is allowed only from your custom enum
如果传递的参数不是您想要的,则从您的方法中抛出IllegalArgumentException
。
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