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Further understanding setRetainInstance(true)
...cause it does have some useful information, but sadly none of it is linked from setRetainInstance(). From the page about fragments
Note: Each fragment requires a unique identifier that the system can
use to restore the fragment if the activity is restarted (and which
you can use to capture t...
Java - Method name collision in interface implementation
...ue; } // Beta.m()
};
}
}
Although it doesn't allow for casts from AlfaBeta to Beta, downcasts are generally evil, and if it can be expected that an Alfa instance often has a Beta aspect, too, and for some reason (usually optimization is the only valid reason) you want to be able to con...
How do HashTables deal with collisions?
...tries
Incremental resizing
Monotonic keys
EDIT: the above are borrowed from wiki_hash_table, where you should go to have a look to get more info.
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What's the opposite of head? I want all but the first N lines of a file
...first 2 lines, -n +3 should give you the output you are looking for (start from 3rd).
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Python UTC datetime object's ISO format doesn't include Z (Zulu or Zero offset)
...age to get some default time zones, or directly subclass tzinfo yourself:
from datetime import datetime, tzinfo, timedelta
class simple_utc(tzinfo):
def tzname(self,**kwargs):
return "UTC"
def utcoffset(self, dt):
return timedelta(0)
Then you can manually add the time zone...
Is Python strongly typed?
...n choice made when + was implemented, but not really a necessity following from the language's semantics. In fact, when you overload + on a custom type, you can make it implicitly convert anything to a number:
def to_number(x):
"""Try to convert function argument to float-type object."""
tr...
Why do x86-64 systems have only a 48 bit virtual address space?
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Where does the 4 come from in the 4 petabytes? If we're talking 64 address lines we should end up with the square of the address space made possible by 32 address lines which is 4 gigabytes. Square that and we should have 16, not 4 petabytes. Am I...
How does PHP 'foreach' actually work?
...$outerArr);
Here, $arr will be duplicated to prevent IAP changes on $arr from leaking to $outerArr. In terms of the conditions above, the array is not a reference (is_ref=0) and is used in two places (refcount=2). This requirement is unfortunate and an artifact of the suboptimal implementation (th...
android fragment- How to save states of views in a fragment when another fragment is pushed on top o
...ion of your problem ;)
OnActivityCreated is invoked after fragment returns from back stack.
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In bash, how does one clear the current input?
...n bash, but if you have e.g. a mysql client prompt, Ctrl-C will disconnect from the server which is really annoying.
– Christian
Nov 25 '13 at 10:54
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