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How to manage startActivityForResult on Android?
In my activity, I'm calling a second activity from the main activity by startActivityForResult . In my second activity, there are some methods that finish this activity (maybe without a result), however, just one of them returns a result.
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Get root view from current activity
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You can just call findViewById(R.id.imageView1); on the activity if you want the specific view.
– RobCo
Apr 21 '17 at 15:55
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JavaScript validation for empty input field
I have this input field
<input name="question"/> I want to call IsEmpty function when submit clicking submit button.
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How do I delete rows in a data frame?
...ent of a set is given by the '-' operator.
So, assuming the data.frame is called myData:
myData[-c(2, 4, 6), ] # notice the -
Of course, don't forget to "reassign" myData if you wanted to drop those rows entirely---otherwise, R just prints the results.
myData <- myData[-c(2, 4, 6), ]
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What is the opposite of evt.preventDefault();
...rovided by another comments and answers:
How to unbind a listener that is calling event.preventDefault() (using jQuery)?
How to reenable event.preventDefault?
Note that the second one has been accepted with an example solution, given by redsquare (posted here for a direct solution in case this is...
Android, canvas: How do I clear (delete contents of) a canvas (= bitmaps), living in a surfaceView?
...(or redraw) the WHOLE canvas for a new layout (= try at the game) ?
Just call Canvas.drawColor(Color.BLACK), or whatever color you want to clear your Canvas with.
And: how can I update just a part of the screen ?
There is no such method that just update a "part of the screen" since Android O...
Android Text over image
... class inherited from the Class ImageView and
override the Method onDraw. Call super.onDraw() in that method first and
then draw some Text you want to display.
if you do it that way, you can use this as a single Layout Component which makes it easier to layout together with other components.
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How to detect DIV's dimension changed?
...the div's dimension change event? and How to do that? I currently bind the callback function to the jQuery resize event on the target DIV, however, no console log is outputted, see below:
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How to tell if browser/tab is active [duplicate]
I have a function that is called every second that I only want to run if the current page is in the foreground, i.e. the user hasn't minimized the browser or switched to another tab. It serves no purpose if the user isn't looking at it and is potentially CPU-intensive, so I don't want to just waste ...
Design Pattern for Undo Engine
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This is basically how the undo engine in Cocoa, NSUndoManager, works.
– amrox
Sep 8 '08 at 20:39
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