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How to prevent multiple instances of an Activity when it is launched with different Intents
...ication when it is launched using the "Open" button on the Google Play Store app (previously called Android Market). It seems that launching it from the Play Store uses a different Intent than launching it from the phone's application menu of icons. This is leading to multiple copies of the same...
Renaming table in rails
...
You would typically do this sort of thing in a migration:
class RenameFoo < ActiveRecord::Migration
def self.up
rename_table :foo, :bar
end
def self.down
rename_table :bar, :foo
end
end
...
Why sizeof int is wrong, while sizeof(int) is right?
We know that sizeof is an operator used for calculating the size of any datatype and expression, and when the operand is an expression, the parentheses can be omitted.
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Is there a difference between “==” and “is”?
...gt;>> b == a
True
# Make a new copy of list `a` via the slice operator,
# and assign it to variable `b`
>>> b = a[:]
>>> b is a
False
>>> b == a
True
In your case, the second test only works because Python caches small integer objects, which is an implementation...
Valid to use (anchor tag) without href attribute?
...
The <a>nchor element is simply an anchor to or from some content. Originally the HTML specification allowed for named anchors (<a name="foo">) and linked anchors (<a href="#foo">).
The named anchor format is less commonly ...
When to throw an exception?
I have exceptions created for every condition that my application does not expect. UserNameNotValidException , PasswordNotCorrectException etc.
...
How to check if an app is installed from a web-page on an iPhone?
...ant to create a web-page, a page that will redirect an iPhone to the app-store if the iPhone does not have the application installed, but if the iPhone has the app installed I want it to open the application.
...
How to get element by class name? [duplicate]
...ctually getElementsByClassName, not getElementByClassName, simply because more than one element on the page can have the same class, hence: Elements.
The return value of this will be a NodeList instance, or a superset of the NodeList (FF, for instance returns an instance of HTMLCollection). At any ...
WPF Data Binding and Validation Rules Best Practices
...eate custom ValidationRules, but I am wondering if this would be overkill for my needs.
6 Answers
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Is there a pattern for initializing objects created via a DI container
...u need a run-time value to construct a particular dependency, Abstract Factory is the solution.
Having Initialize methods on the interfaces smells of a Leaky Abstraction.
In your case I would say that you should model the IMyIntf interface on how you need to use it - not how you intent to create i...