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How to add a button to a PreferenceScreen?
...reference android:title="Acts like a button"
android:key="@string/myCoolButton"
android:summary="This is a cool button"/>
Then for the java in your onCreate()
Preference button = findPreference(getString(R.string.myCoolButton));
button.setOnPreferenceClickListen...
Hidden features of Scala
... "Hello, world")
The right hand expression creates a Tuple3[Int, Double, String] which can match the pattern (a, b, c).
Most of the time your patterns use extractors that are members of singleton objects. For example, if you write a pattern like
Some(value)
then you're implicitly calling the ...
How to update the value stored in Dictionary in C#?
How to update value for a specific key in a dictionary Dictionary<string, int> ?
7 Answers
...
C# Lazy Loaded Automatic Properties
...can use the 4.0 Lazy<T> type to create this pattern
private Lazy<string> _someVariable =new Lazy<string>(SomeClass.IOnlyWantToCallYouOnce);
public string SomeVariable => _someVariable.Value;
This code will lazily calculate the value of _someVariable the first time the Value e...
What is a plain English explanation of “Big O” notation?
...up them by matching color and pattern. We then exploit this to avoid doing extra work later (comparing puzzle pieces of like color to each other, not to every other single puzzle piece).
The moral of the story: a data structure lets us speed up operations. Even more, advanced data structures can l...
How to empty a list in C#?
...you mean a List<T>, then the Clear method is what you want:
List<string> list = ...;
...
list.Clear();
You should get into the habit of searching the MSDN documentation on these things.
Here's how to quickly search for documentation on various bits of that type:
List Class - provid...
JavaScript string encryption and decryption?
...TML = decrypted;
document.getElementById("demo3").innerHTML = decrypted.toString(CryptoJS.enc.Utf8);
Full working sample actually is:
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/aes.js" integrity="sha256-/H4YS+7aYb9kJ5OKhFYPUjSJdrtV6AeyJOtTkw6X72o=" crosso...
Is there a built in function for string natural sort?
Using Python 3.x, I have a list of strings for which I would like to perform a natural alphabetical sort.
18 Answers
...
Modify SVG fill color when being served as Background-Image
... choose a color
$icon-color: #F84830;
// functions to urlencode the svg string
@function str-replace($string, $search, $replace: '') {
$index: str-index($string, $search);
@if $index {
@return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-leng...
How to Validate a DateTime in C#?
...x.Text, out value))
{
startDateTextox.Text = DateTime.Today.ToShortDateString();
}
Reasons for preferring this approach:
Clearer code (it says what it wants to do)
Better performance than catching and swallowing exceptions
This doesn't catch exceptions inappropriately - e.g. OutOfMemoryExcep...