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Usages of Null / Nothing / Unit in Scala
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if you use Nothing, there is no things to do (include print console)
if you do something, use output type Unit
object Run extends App {
//def sayHello(): Nothing = println("hello?")
def sayHello(): Unit = println("hello?")
sayHello()
}
... then how to use Nothing?
trait ...
How to check if a file exists in Documents folder?
... In-App Purchase, that when the user buy something, download one html file into the Documents folder of my app.
7 Answers
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How do I filter query objects by date range in Django?
... in this case i use: date__range=["%s-%s-1"%(year,month),"%s-%s-1"%(year,int(month)+1)]
– SpiRail
Sep 1 '16 at 13:03
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Flatten an irregular list of lists
...work with things that aren't lists initially, e.g. for i in flatten(42): print (i). This could be fixed by moving the isinstance-test and the else-clause outside of the for el-loop. (Then you could throw anything at it, and it would make a flattened list out of it)
– RolKau
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Getting reference to the top-most view/window in iOS application
... I'm getting (null) in my iOS-8 app (storyboards issue?) Any hints? Thanks! (Note: (null) returned both at viewDidLoad and viewWillAppear: time. viewDidAppear: is too late.
– Olie
Feb 26 '15 at 18:29
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Image, saved to sdcard, doesn't appear in Android's Gallery app
... after my 'save to sdcard' code that fixed the problem:
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
share
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improve thi...
QLabel: set color of text and background
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Thank you for pointing out that the autoFillBackground is a key issue here. The accepted answer above does not work without that setting.
– BSD
Apr 4 '18 at 21:45
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How to programmatically set style attribute in a view
.... That's why I would like to set style dynamicly.
– Lint_
Jan 7 '10 at 8:42
3
Well you can't chan...
Force line-buffering of stdout when piping to tee
Usually, stdout is line-buffered. In other words, as long as your printf argument ends with a newline, you can expect the line to be printed instantly. This does not appear to hold when using a pipe to redirect to tee .
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Android - Back button in the title bar
...you tap a button and enter a new activity, the icon in the title bar turns into a back button, but for the app I am making, it doesn't do that. How do I make that icon take you back to the previous screen?
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