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Android: What's the difference between Activity.runOnUiThread and View.post?
...int the JavaDoc for View.java did wrongly state that "View.post only works from another thread when the View is attached to a window". This was fixed on Oct. 15, 2012, but took a while to penetrate the minds of Android developers.
– Alex Cohn
Jun 26 '16 at 11:5...
Get difference between two lists
...fo objects I was using set subtraction. To exclude certain tarinfo objects from being extracted from the archive. Creating the new list was fast but super slow during extraction. The reason evaded me at first. Turns out reordering the tarinfo objects list caused a huge performance penalty. Switching...
How can I dynamically create derived classes from a base class
...bles" -
So, you could just add your classes to a dictionary and use them from there:
name = "SpecialClass"
classes = {}
classes[name] = ClassFactory(name, params)
instance = classes[name](...)
And if your design absolutely needs the names to come in scope,
just do the same, but use the dictiona...
Pickle or json?
...
Apart from security, JSON has the additional advantage that it makes migrations easy, so you can load data that was saved by an older version of your application. Meanwhile you could have added a field, or replaced a whole sub stru...
How do I exit from the text window in Git?
...
It's worth getting to know vim so you can quit it from a wide variety of applications that default to it.
– djechlin
Sep 16 '17 at 21:35
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Check if a string contains an element from a list (of strings)
...
There were a number of suggestions from an earlier similar question "Best way to test for existing string against a large list of comparables".
Regex might be sufficient for your requirement. The expression would be a concatenation of all the candidate substr...
Convert string to number and add one
I want to turn the value I get from the id into a number and add one to it then pass the new value into the dosomething() function to use. When I tried this and the value is one I get back 11 not 2.
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Adding a column to a data.frame
... add a column to your data using various techniques. The quotes below come from the "Details" section of the relevant help text, [[.data.frame.
Data frames can be indexed in several modes. When [ and [[ are used with a single vector index (x[i] or x[[i]]), they index the data frame as if it were...
How can I add reflection to a C++ application?
...iterate over the fields we use the visitor pattern. We create an MPL range from 0 to the number of fields, and access the field data at that index. Then it passes the field data on to the user-provided visitor:
struct field_visitor
{
template<class C, class Visitor, class I>
void oper...
What is the most elegant way to remove a path from the $PATH variable in Bash?
Or more generally, how do I remove an item from a colon-separated list in a Bash environment variable?
33 Answers
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