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Start an Activity with a parameter
... null, lets say you want to start this activity from another place and you do it the standard way, with no params. It will throw a NPE. You should always consider this params optional.
– Gaspar de Elias
Aug 16 '12 at 9:30
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How to calculate a time difference in C++
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See std::clock() function.
const clock_t begin_time = clock();
// do something
std::cout << float( clock () - begin_time ) / CLOCKS_PER_SEC;
If you want calculate execution time for self ( not for user ), it is better to do this in clock ticks ( not seconds ).
EDIT:
responsible ...
Conversion from Long to Double in Java
Is there any way to convert a Long data type to Double or double ?
8 Answers
8
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Interactive search/replace regex in Vim?
I know the regex for doing a global replace,
7 Answers
7
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Python None comparison: should I use “is” or ==?
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is checks for object identity. There is only 1 object None, so when you do my_var is None, you're checking whether they actually are the same object (not just equivalent objects)
In other words, == is a check for equivalence (which is defined from object to object) whereas is checks for object ...
How do I get the coordinates of a mouse click on a canvas element?
...X || e.pageY) {
x = e.pageX;
y = e.pageY;
}
else {
x = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
y = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
}
x -= gCanvasElement.offsetLeft;
y -= gCanvasElement.offsetTop;
Worked perf...
Throwing exceptions from constructors
..., throwing an exception from the failed constructor is the standard way of doing this. Read this FAQ about Handling a constructor that fails for more information. Having a init() method will also work, but everybody who creates the object of mutex has to remember that init() has to be called. I feel...
How do I get the backtrace for all the threads in GDB?
...x "thread apply all bt" -ex "quit" > output.log
– Doomsday
Mar 28 '18 at 9:32
1
You can shorte...
How do you copy a record in a SQL table but swap out the unique id of the new row?
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The id-column is an identity column (in my table) so I don't care about the value. I just want a new record holding the same values as the "old" one.
– Jonas
Feb 22 '13 at 14:26
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Android TextView Justify Text
How do you get the text of a TextView to be Justified (with text flush on the left- and right- hand sides)?
27 Answers
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