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How to pass a variable from Activity to Fragment, and pass it back?
... the method onCreate or onCreateView of your fragment.
On the newInstance function of your fragment you add the arguments you wanna send to it:
/**
* Create a new instance of DetailsFragment, initialized to
* show the text at 'index'.
*/
public static DetailsFragment newInstance(int index) {
...
Connecting overloaded signals and slots in Qt 5
... getting to grips with the new signal/slot syntax (using pointer to member function) in Qt 5, as described in New Signal Slot Syntax . I tried changing this:
...
What is the purpose of a stack? Why do we need it?
...ters, thus greatly improving execution speed. A Dalvik jitter has the opposite problem.
The machine stack is otherwise a very basic storage facility that has been around in processor designs for a very long time. It has very good locality of reference, a very important feature on modern CPUs that...
Is REST DELETE really idempotent?
...ot all-effects or responses. If you do a DELETE http://example.com/account/123 then the effect is that account 123 is now deleted from the server. That is the one and only effect, the one and only change to the state of the server. Now lets say you do the same DELETE http://example.com/account/123 ...
java.util.regex - importance of Pattern.compile()?
...ch is really called a lot :)
public class AmountValidator {
//Accept 123 - 123,456 - 123,345.34
private static final String AMOUNT_REGEX="\\d{1,3}(,\\d{3})*(\\.\\d{1,4})?|\\.\\d{1,4}";
//Compile and save the pattern
private static final Pattern AMOUNT_PATTERN = Pattern.compile(AM...
Fit Image in ImageButton in Android
....let { retrieveAttributes(it) }
}
/**
*
*/
override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {
val width = right - left
val height = bottom - top
val horizontalPadding = if(width > iconWidth) (width - iconWidth) /...
Any way to declare an array in-line?
...rray = {1, 2, 3};
If you have to inline, you'll need to declare the type:
functionCall(new String[]{"blah", "hey", "yo"});
or use varargs (variable arguments)
void functionCall(String...stringArray) {
// Becomes a String[] containing any number of items or empty
}
functionCall("blah", "hey", ...
Why catch and rethrow an exception in C#?
...ple, in VB you can do
Try
..
Catch Ex As MyException When Ex.ErrorCode = 123
..
End Try
...which would not handle MyExceptions with different ErrorCode values. In C# prior to v6, you would have to catch and re-throw the MyException if the ErrorCode was not 123:
try
{
...
}
catch(MyExcepti...
What is boxing and unboxing and what are the trade offs?
...xing is the conversion of a reference type into a value type.
EX: int i = 123;
object o = i;// Boxing
int j = (int)o;// UnBoxing
Value Types are: int, char and structures, enumerations.
Reference Types are:
Classes,interfaces,arrays,strings and objects
...
How can I get the full/absolute URL (with domain) in Django?
...absolute URL (e.g. https://example.com/some/path ) in Django without the Sites module ? That's just silly... I shouldn't need to query my DB to snag the URL!
...