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Error : BinderProxy@45d459c0 is not valid; is your activity running?
...vity is being destroyed.
I was seeing this error reported once in a while from some of my apps when the activity calling the dialog was finishing for some reason or another when it tried to show a dialog. Here's what solved it for me:
if(!((Activity) context).isFinishing())
{
//show dialog
}
...
How do I bind a WPF DataGrid to a variable number of columns?
...out binding only to DataGrid. 2. Check e.OldValue for null and unsubscribe from CollectionChanged event to prevent memory leaks. Just for your convince.
– Mike Eshva
Oct 23 '13 at 13:01
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How do I capture SIGINT in Python?
...SIGINT, signal_handler)
print('Press Ctrl+C')
signal.pause()
Code adapted from here.
More documentation on signal can be found here.
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Current time in microseconds in java
...at ability.
It does have System.nanoTime(), but that just gives an offset from some previously known time. So whilst you can't take the absolute number from this, you can use it to measure nanosecond (or higher) precision.
Note that the JavaDoc says that whilst this provides nanosecond precision, ...
If strings are immutable in .NET, then why does Substring take O(n) time?
...(n) is O(1) if n does not grow large. Most people extract tiny substrings from tiny strings, so how the complexity grows asymptotically is completely irrelevant.
The long answer is:
An immutable data structure built such that operations on an instance permit re-use of the memory of the original w...
JSON, REST, SOAP, WSDL, and SOA: How do they all link together
... developing a web-application and you decide to decouple the functionality from the presentation of the application, because it affords greater freedom.
You create an API and let others implement their own front-ends over it as well. What you just did here is implement an SOA methodology, i.e. usi...
ALTER TABLE without locking the table?
...
This question from 2009. Now MySQL offers a solution:
Online DDL (Data Definition Language)
A feature that improves the performance, concurrency, and availability
of InnoDB tables during DDL (primarily ALTER TABLE) operations. See
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Any reason to prefer getClass() over instanceof when generating .equals()?
...in most of them. She also gets into the instanceof vs getClass. Some quote from it
Conclusions
Having dissected the four arbitrarily chosen examples of implementations of equals() , what do we conclude?
First of all: there are two substantially different ways of performing the check for type match ...
Memcache(d) vs. Varnish for speeding up 3 tier web architecture
... comment invalidated the page cache, so this page would have to be cleared from Varnish (and also my profile page, which probably isn't worth caching to begin with. Remembering to invalidate all affected pages may be a bit of an issue). All the comments, however, are still in Memcache, so the databa...
Why is spawning threads in Java EE container discouraged?
...ll as others
More info here
And here
Also somewhat duplicates this one from this morning
UPDATE: Please note that this question and answer relate to the state of Java EE in 2009, things have improved since then!
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