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Repeat a task with a time delay?
...n the main UI thread, so you will be able to update UI controls.
private int mInterval = 5000; // 5 seconds by default, can be changed later
private Handler mHandler;
@Override
protected void onCreate(Bundle bundle) {
// your code here
mHandler = new Handler();
startRepeatingTask();...
throwing exceptions out of a destructor
...estructor - doing so results in undefined behavior. Stroustrup makes the point that "the vector destructor explicitly invokes the destructor for every element. This implies that if an element destructor throws, the vector destruction fails... There is really no good way to protect against exception...
Pass a data.frame column name to a function
...want to save the user from typing all those quotes, one option might be to convert bare, unquoted column names to strings using deparse(substitute()):
new_column2 <- function(df,col_name,col1,col2){
col_name <- deparse(substitute(col_name))
col1 <- deparse(substitute(col1))
col...
In what cases do I use malloc and/or new?
...ree and malloc/delete.
Note: Some answers in this question are invalid.
int* p_scalar = new int(5); // Does not create 5 elements, but initializes to 5
int* p_array = new int[5]; // Creates 5 elements
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Entity framework code-first null foreign key
...
You must make your foreign key nullable:
public class User
{
public int Id { get; set; }
public int? CountryId { get; set; }
public virtual Country Country { get; set; }
}
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im...
Clicking the back button twice to exit an activity
...ive such as;
What's wrong with measuring time passed and checking if TIME_INTERVAL miliseconds (say 2000) passed since the last back press. The following sample code uses System.currentTimeMillis(); to store the time onBackPressed() is called;
private static final int TIME_INTERVAL = 2000; // # mi...
Jaxb, Class has two properties of the same name
with jaxb, i try to read an xml file
only a few element in xml file are interesting, so i would like to skip many element
2...
PendingIntent does not send Intent extras
My MainActicity starts RefreshService with a Intent which has a boolean extra called isNextWeek .
3 Answers
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What is meant by Scala's path-dependent types?
...
My favorite example:
case class Board(length: Int, height: Int) {
case class Coordinate(x: Int, y: Int) {
require(0 <= x && x < length && 0 <= y && y < height)
}
val occupied = scala.collection.mutable.Set[Coordinate]()
}
...
How do I clear this setInterval inside a function?
Normally, I’d set the interval to a variable and then clear it like var the_int = setInterval(); clearInterval(the_int); but for my code to work I put it in an anonymous function:
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