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Example: Communication between Activity and Service using Messaging
... an instance of itself to consumers who call onBind. Then you can directly interact with the service, e.g. registering your own listener interface with the service, so that you can get callbacks.
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How to get all subsets of a set? (powerset)
... is 2 ** len(A), so that could clearly be seen in the for loop.
I need to convert the input (ideally a set) into a list because by a set is a data structure of unique unordered elements, and the order will be crucial to generate the subsets.
selector is key in this algorithm. Note that selector ha...
What is the “right” JSON date format?
...is a non-standard hack/extension.
I would use a format that can be easily converted to a Date object in JavaScript, i.e. one that can be passed to new Date(...). The easiest and probably most portable format is the timestamp containing milliseconds since 1970.
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What is the difference between Type and Class?
...lass defines how the
object is implemented .The class
defines object's internal state and
the implementation of its
operations.
In contrast, an object's
type only refers to its interface - a
set of requests to which it can
respond.
An object can have many types,
and objects...
How to call Android contacts list?
...hen return to my app with the contact's name. Here's the code I got on the internet, but it doesnt work.
13 Answers
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What is the difference between IQueryable and IEnumerable?
...of the query has to be represented in data such that the LINQ provider can convert it into the appropriate form for the out-of-memory execution - whether that's an LDAP query, SQL or whatever.
More in:
LINQ : IEnumerable<T> and IQueryable<T>
C# 3.0 and LINQ.
"Returning IEnumerable<...
Why does the order of the loops affect performance when iterating over a 2D array?
...ttle chunks (called 'cache lines'), typically 64 bytes. If you have 4-byte integers, that means you're geting 16 consecutive integers in a neat little bundle. It's actually fairly slow to fetch these chunks of memory; your CPU can do a lot of work in the time it takes for a single cache line to load...
How do I check if a number is positive or negative in C#?
...ic static class AwesomeExtensions
{
public static bool IsPositive(this int number)
{
return number > 0;
}
public static bool IsNegative(this int number)
{
return number < 0;
}
public static bool IsZero(this int number)
{
return number =...
What integer hash function are good that accepts an integer hash key?
What integer hash function are good that accepts an integer hash key?
11 Answers
11
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Use JNI instead of JNA to call native code?
...ill perform worse than with JNI. For example when passing arrays, JNA will convert these from Java to native at the beginning of each function call and back at the end of the function call. With JNI, you can control yourself when a native "view" of the array is generated, potentially only creating a...