大约有 40,000 项符合查询结果（耗时：0.0456秒） [XML]
Wrong requestCode in onActivityResult
...rResult() from your Fragment. When you do this, the requestCode is changed by the Activity that owns the Fragment.
If you want to get the correct resultCode in your activity try this:
Change:
startActivityForResult(intent, 1);
To:
getActivity().startActivityForResult(intent, 1);
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Setting a property by reflection with a string value
I'd like to set a property of an object through Reflection, with a value of type string .
So, for instance, suppose I have a Ship class, with a property of Latitude , which is a double .
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Can Json.NET serialize / deserialize to / from a stream?
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JsonTextReader will close its StreamReader by default, so this example could be simplified a bit by constructing the StreamReader in the call to the JsonTextReader constructor.
– Oliver Bock
Jun 29 '16 at 6:31
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Android Location Providers - GPS or Network Provider?
...availability of cell tower and WiFi access points. Results are
retrieved by means of a network lookup. Requires either of the
permissions android.permission.ACCESS_COARSE_LOCATION or
android.permission.ACCESS_FINE_LOCATION.
passive –> (CellID, WiFi MACID): A special location provider...
Differences between Exception and Error
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This slide showing Java's exception hierarchy by @georgios-gousios concisely explains the differences between Errors and Exceptions in Java.
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What is an optional value in Swift?
... is a type that can hold either a value or no value. Optionals are written by appending a ? to any type:
var name: String? = "Bertie"
Optionals (along with Generics) are one of the most difficult Swift concepts to understand. Because of how they are written and used, it's easy to get a wrong idea o...
Is mathematics necessary for programming? [closed]
...9 years old and it would be a stretch to say I had learnt much mathematics by that stage. However, with a bit of effort I was able to understand variables, for loops, goto statements (forgive me, I was Vic 20 BASIC and I hadn't read any Dijkstra yet) and basic co-ordinate geometry to put graphics on...
input type=“submit” Vs button tag are they interchangeable?
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The <input type="button"> is just a button and won't do anything by itself.
The <input type="submit">, when inside a form element, will submit the form when clicked.
Another useful 'special' button is the <input type="reset"> that will clear the form.
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Getting the client's timezone offset in JavaScript
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Mozilla Date Object reference
Note that not all timezones are offset by whole hours: for example, Newfoundland is UTC minus 3h 30m (leaving Daylight Saving Time out of the equation).
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Why should I use version control? [closed]
... your code?
Wanted to see how much work is being done, and where, when and by whom?
Wanted to experiment with a new feature without interfering with working code?
In these cases, and no doubt others, a version control system should make your life easier.
To misquote a friend: A civilised tool ...