Tutorial by Examples: i

public class CustomSurfaceView extends SurfaceView { @Override public boolean onTouchEvent(MotionEvent e) { super.onTouchEvent(e); if(e.getPointerCount() > 2){ return false; // If we want to limit the amount of pointers, we return false //...

A splash screen is just like any other activity, but it can handle all of your startup-needs in the background. Example: Manifest: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="...

There is more than one way to do it: Using the package manager: sudo apt install perl Installing from source: wget http://www.cpan.org/src/5.0/perl-version.tar.gz tar -xzf perl-version.tar.gz cd perl-version ./Configure -de make make test make install Installing in your $h...

As we said before, we go with the open-source version. For Windows you can choose strawberry or DWIM. Here we cover the strawberry version, since DWIM is based on it. The easy way here is installing from the official executable. See also berrybrew - the perlbrew for Windows Strawberry Perl

NLTK provides the FreqDist class that let's us easily calculate a frequency distribution given a list as input. Here we are using a list of part of speech tags (POS tags) to see which lexical categories are used the most in the brown corpus. import nltk brown_tagged = nltk.corpus.brown.tagged_w...

A function is defined by at least its return type and an unique name. void say_hello () { print ("Hello, world!\n"); } Then, to call it just use the name of the function followed by a parenthese. say_hello (); Functions can also have parameters between the parentheses, d...

Parameters can be marked as optional by giving them a default value. Optional parameters can be omitted when calling the function. string greet (string name, string language = "English") { if (language == "English") { return @"Hello, $name!"; } else ...

You can assert that parameters have certain values with requires. int fib (int i) requires (i > 0) { if (i == 1) { return i; } else { return fib (i - 1) + fib (i - 2); } } fib (-1); You won't get any error during the compilation, but you'll get an error wh...

int sum (int x, ...) { int result = x; va_list list = va_list (); for (int? y = list.arg<int?> (); y != null; y = list.arg<int?> ()) { result += y; } return result; } int a = sum (1, 2, 3, 36); With this function, you can pass as many int as you w...

A key part of the Reader monad is the ask (https://hackage.haskell.org/package/mtl-2.2.1/docs/Control-Monad-Reader.html#v:ask) function, which is defined for illustrative purposes: import Control.Monad.Trans.Reader hiding (ask) import Control.Monad.Trans ask :: Monad m => ReaderT r m r ask ...

This is an official MATLAB example Consider the following code: month = [1;1;2;3;8;1;3;4;9;11;9;12;3;4;11]; temperature = [57;61;60;62;45;59;64;66;40;56;38;65;61;64;55]; maxTemp = accumarray(month,temperature,[],@max); The image below demonstrates the computation process done by accumarray in...

A discriminant of a record type may influence the structure of objects. A choice of components may exists in an object according as a discriminant had had a particular value when the object was created. To support this variation, a record type's definition includes a distinction by cases that depend...

Generic subprograms are usefull to create a subprograms that have the same structure for several types. For example, to swap two objects: generic type A_Type is private; procedure Swap (Left, Right : in out A_Type) is Temp : A_Type := Left; begin Left := Right; Right := Temp; ...

In Ada generic package, upon instantiation, data are duplicated; that is, if they contain global variables, each instance will have its own copy of the variable, properly typed and independent from the others. generic type T is private; package Gen is type C is tagged record V :...

Ada offers a wide variety of generic parameters which is difficult to translate into other languages. The parameters used during instantiation and as a consequence those on which the generic unit may rely on may be variables, types, subprograms, or package instances, with certain properties. For exa...

Getting elements to center or bottom align vertically has always been a challenge with CSS and Bootstrap. The desired vertical alignment may be within a parent container, or relative to adjacent elements. Now that Bootstrap 4 is flexbox by default there are many different approaches to vertical ali...

This example shows a simple but effective splash screen with animation that can be created by using Android Studio. Step 1: Create an animation Create a new directory named anim in the res directory. Right-click it and create a new Animation Resource file named fade_in.xml: Then, put the follow...

If you bind a buffer to GL_PIXEL_UNPACK_BUFFER then the data parameter in glTexImage2D is a offset into that buffer. This means that the glTexImage2D doesn't need to wait for all the data to be copied out of the application's memory before it can return, reducing overhead in the main thread. glGen...

You can see the running demo by clicking here. HTML: <p> <span>Counter State</span><br /> (<em>Will increase each minute</em>): <p> <span id="counter-state" style="font-weight: bolder"></span> </p> &l...

API: Application programming interface are the set of requirements which govern how one application can talk to another, API's are what makes the information exchange between programs possible. For Example System-level APIs makes it possible for applications like LibreOffice to run on top of an ...