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Why are Objective-C delegates usually given the property assign instead of retain?
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44
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How to extract the file name from URI returned from Intent.ACTION_GET_CONTENT?
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developer.android.com has nice example code for this:
https://developer.android.com/guide/topics/providers/document-provider.html
A condensed version to just extract the file name (assuming "this" is an Activity):
public String getFileName(U...
How to get a number of random elements from an array?
...d suggest using Python's implementation if you are going for speed: jsperf.com/pick-random-elements-from-an-array
– Derek 朕會功夫
Aug 7 '17 at 23:29
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Compare two Byte Arrays? (Java)
...10001", 2).toByteArray() == array)
When dealing with objects, == in java compares reference values. You're checking to see if the reference to the array returned by toByteArray() is the same as the reference held in array, which of course can never be true. In addition, array classes don't overrid...
UITableView, Separator color where to set?
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57
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Error installing mysql2: Failed to build gem native extension
... replaced by ruby-mysql. This is where I found the solution.
If the above command doesn't work because libmysql-ruby cannot be found, the following should be sufficient:
sudo apt-get install libmysqlclient-dev
On Red Hat/CentOS and other distributions using yum:
sudo yum install mysql-devel
O...
Select rows of a matrix that meet a condition
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29
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How to compare times in Python?
I see that date comparisons can be done and there's also datetime.timedelta() , but I'm struggling to find out how to check if the current time ( datetime.datetime.now() ) is earlier, later or the same than a specified time (e.g. 8am) regardless of the date.
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