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How does push notification technology work on Android?
How has Google implem>me m>nted their push notification feature? Does it work through polling done by a service running in the background or in a different way?
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Biggest differences of Thrift vs Protocol Buffers?
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They both offer many of the sam>me m> features; however, there are som>me m> differences:
Thrift supports 'exceptions'
Protocol Buffers have much better docum>me m>ntation/examples
Thrift has a builtin Set type
Protocol Buffers allow "extensions" - you can extend an e...
How to force keyboard with numbers in mobile website in Android
I have a mobile website and it has som>me m> HTML input elem>me m>nts in it, like this:
7 Answers
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How can I catch all the exceptions that will be thrown through reading and writing a file?
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If you want, you can add throws clauses to your m>me m>thods. Then you don't have to catch checked m>me m>thods right away. That way, you can catch the exceptions later (perhaps at the sam>me m> tim>me m> as other exceptions).
The code looks like:
public void som>me m>m>Me m>thode() throws Som>me m>Chec...
How to vertically center a div for all browsers?
... with CSS. I don't want tables or JavaScript, but only pure CSS. I found som>me m> solutions, but all of them are missing Internet Explorer 6 support.
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How to check if multiple array keys exists
... exists.
if (array_key_exists("story", $arr) && array_key_exists("m>me m>ssage", $arr)) {
// Both keys exist.
}
However this obviously doesn't scale up well to many keys. In that situation a custom function would help.
function array_keys_exists(array $keys, array $arr) {
return !array...
How to set java_hom>me m> on Windows 7?
I went to the Environm>me m>nt Variables in 'System' in the control panel and made two new variables, one for user variables and one for system variables. Both were nam>me m>d JAVA_HOm>ME m> and both pointing to
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Why would an Enum implem>me m>nt an Interface?
I just found out that Java allows enums to implem>me m>nt an interface. What would be a good use case for that?
16 Answers
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ASP.NET MVC Conditional validation
...idation rules in MVC3; have your model inherit IValidatableObject and implem>me m>nt the Validate m>me m>thod:
public class Person : IValidatableObject
{
public string Nam>me m> { get; set; }
public bool IsSenior { get; set; }
public Senior Senior { get; set; }
public IEnum>me m>rable<ValidationRes...
Validating IPv4 addresses with regexp
...o get an efficient regex for IPv4 validation, but without much luck. It seem>me m>d at one point I had had it with (25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?(\.|$)){4} , but it produces som>me m> strange results:
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