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Change Screen Orientation programmatically using a Button
...indowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
final int orientation = display.getOrientation();
// OR: orientation = getRequestedOrientation(); // inside an Activity
// set the screen orientation on button click
Button btn = (Button) findViewById(R.id.yourbutton);
btn.setOn...
Meaning of @classmethod and @staticmethod for beginner? [duplicate]
...d
def from_string(cls, date_as_string):
day, month, year = map(int, date_as_string.split('-'))
date1 = cls(day, month, year)
return date1
@staticmethod
def is_date_valid(date_as_string):
day, month, year = map(int, date_as_string.split('-'))
retur...
Naming convention - underscore in C++ and C# variables
...avoid starting a symbol with an underscore in case you accidentally wander into one of the above limitations.
You can see it for yourself why such use of underscores can be disastrous when developing a software:
Try compiling a simple helloWorld.cpp program like this:
g++ -E helloWorld.cpp
You ...
Why does Math.Round(2.5) return 2 instead of 3?
...round to even" (banker's rounding):
Return ValueType: System.DoubleThe integer nearest a. If the
fractional component of a is halfway
between two integers, one of which is
even and the other odd, then the even
number is returned. Note that this
method returns a Double instead of an
i...
Android Fragment handle back button press [duplicate]
... of your FragmentTransaction:
FragmentTransaction tx = fragmentManager.beginTransation();
tx.replace( R.id.fragment, new MyFragment() ).addToBackStack( "tag" ).commit();
If you require more detailed control (i.e. when some Fragments are visible, you want to suppress the back key) you can set an O...
Do I need quotes for strings in YAML?
...s values
I, however, use double-quotes for integer values that need to be converted to strings like:
docker-compose version like version: "3.8"
port numbers like "8080:8080"
However, for special cases like booleans, floats, integers, and other cases, where using double-quotes for the entry values...
How do I trim a file extension from a String in Java?
...ath had a directory with a . in the name, the one-liner method was tricked into giving part of the path as the filename, which is not correct.
Need for checks
Inspired by skaffman's answer, I took a look at the FilenameUtils.removeExtension method of the Apache Commons IO.
In order to recreate it...
What actually causes a Stack Overflow error? [duplicate]
...fer overflow exception in native programs, when there is a risk of writing into memory that had not been allocated for the buffer, and thus to corrupt some other memory locations. It's not the case at all.
JVM has a given memory allocated for each stack of each thread, and if an attempt to call a m...
differentiate null=True, blank=True in django
...y string ('').
A few examples:
models.DateTimeField(blank=True) # raises IntegrityError if blank
models.DateTimeField(null=True) # NULL allowed, but must be filled out in a form
Obviously, Those two options don't make logical sense to use (though there might be a use case for null=True, blank=F...
std::shared_ptr thread safety explained
...
As others have pointed out, you've got it figured out correctly regarding your original 3 questions.
But the ending part of your edit
Calling reset() in thread IV will delete previous instance of A class created in first thread and replace i...