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Adding Ripple animation

To enable the ripple animation in a CardView, add the following attributes: <android.support.v7.widget.CardView ... android:clickable="true" android:foreground="?android:attr/selectableItemBackground"> ... </android.support.v7.widget.CardView>

Android • CardView

Adding a UIImageView to center of screen

If you want to add a UIImageView to the center of the screen with width and height of 100 pixel, you need to set center x constraint and center y constraint to the superview from the UIImageView and width, height constraint to the UIIMageView. Here is the code. There is way to do this in storyboard ...

autolayout • Getting started with autolayout

Reading and Writing gzip compressed files

Writing a gzipped file To write a gzipped file, use the module IO::Compress::Gzip and create a filehandle by creating a new instance of IO::Compress::Gzip for the desired output file: use strict; use warnings; use open qw( :encoding(UTF-8) :std ); # Make UTF-8 default encoding use IO::Compres...

Perl Language • File I/O (reading and writing files)

The Eval Monad

Parallelism in Haskell can be expressed using the Eval Monad from Control.Parallel.Strategies, using the rpar and rseq functions (among others). f1 :: [Int] f1 = [1..100000000] f2 :: [Int] f2 = [1..200000000] main = runEval $ do a <- rpar (f1) -- this'll take a while... b <- rpa...

Haskell Language • Parallelism

The generated HTML with automaticaly loaded assets

<!DOCTYPE html> <html lang="en-EN"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="csrf-param" content="_csrf"> <me...

yii2 • Asset management

Creating a ReadOnlyCollection

Using the Constructor A ReadOnlyCollection is created by passing an existing IList object into the constructor: var groceryList = new List<string> { "Apple", "Banana" }; var readOnlyGroceryList = new ReadOnlyCollection<string>(groceryList); Using LINQ Additiona...

.NET Framework • ReadOnlyCollections

Updating a ReadOnlyCollection

A ReadOnlyCollection cannot be edited directly. Instead, the source collection is updated and the ReadOnlyCollection will reflect these changes. This is the key feature of the ReadOnlyCollection. var groceryList = new List<string> { "Apple", "Banana" }; var readOnlyGroc...

.NET Framework • ReadOnlyCollections

Warning: Elements in a ReadOnlyCollection are not inherently read-only

If the source collection is of a type that is not immutable, elements accessed through a ReadOnlyCollection can be modified. public class Item { public string Name { get; set; } public decimal Price { get; set; } } public static void FillOrder() { // An order is generated ...

.NET Framework • ReadOnlyCollections

Read with some error checking

A modern Fortran example which includes error checking and a function to get a new unit number for the file. module functions contains function get_new_fileunit() result (f) implicit none logical :: op integer :: f f = 1 do ...

Fortran • I/O

Adjusting brightness and contrast of an image in c++

// main.cpp : Defines the entry point for the console application. // #include "opencv2/highgui/highgui.hpp" #include <iostream> using namespace cv; using namespace std; int main(int argc, const char** argv) { Mat img = imread("lena30.jpg", CV_LOAD_IMAGE...

opencv • Contrast and Brightness in C++

Addition of two vectors using OpenMP parallel for construct

void parallelAddition (unsigned N, const double *A, const double *B, double *C) { unsigned i; #pragma omp parallel for shared (A,B,C,N) private(i) schedule(static) for (i = 0; i < N; ++i) { C[i] = A[i] + B[i]; } } This example adds two vector (A and B into...

openmp • Loop parallelism in OpenMP

Handling existing Readers and Writers

Reading the content of a Reader as a String: // Reading from a file try (Reader reader = new FileReader("in.txt")) { String content = CharStreams.toString(reader); // do something with content } Reading the content of a Reader as a list of line contents: try (Reader reader = n...

guava • I/O

Adding Custom Matchers

Custom matchers can be added in jasmine using the syntax: jasmine.addMatchers([ toMatch: function () { return { compare: function (actual, expected) { return { pass: actual===expected, message: "Expected actual to match expected...

jasmine • Custom Matchers

Downloading a file using the Dropbox Java library

This uses the Dropbox Java SDK to download a file from the Dropbox API at the remote path /Homework/math/Prime_Numbers.txt to the local file Prime_Numbers.txt: String localPath = "Prime_Numbers.txt"; OutputStream outputStream = new FileOutputStream(localPath); FileMetadata metadata = cl...

Dropbox API • Downloading a file

Using an index for a date and time lookup

Many real-world database tables have many rows with DATETIME OR TIMESTAMP column values spanning a lot of time, including years or even decades. Often it's necessary to use a WHERE clause to retrieve some subset of that timespan. For example, we might want to retrieve rows for the date 1-September-2...

MySQL • Date and Time Operations

Join two files read with textFile()

Joins in Spark: Read textFile 1 val txt1=sc.textFile(path="/path/to/input/file1") Eg: A B 1 2 3 4 Read textFile 2 val txt2=sc.textFile(path="/path/to/input/file2") Eg: A C 1 5 3 6 Join and print the result. txt1.join(txt2).foreach(p...

apache-spark • Text files and operations in Scala

Apple's IFA vs. IFV (Apple Identifier for Advertisers vs. Identifier for Vendors)

You can use the IFA for measuring ad clicks and the IFV for measuring app installs. IFA has built-in privacy mechanisms that make it perfect for advertising. In contrast, the IFV is for developers to use internally to measure users who install their apps. IFA ASIdentifierManager class pr...

iOS • UUID (Universally Unique Identifier)

Reading .gz textfile line after line

This class open a .gz file (usual format of compressed log files) and will return a line at each call of .NextLine() There is no memory usage for temporary decompression, very useful for large file. Imports System.IO Class logread_gz Private ptr As FileStream Private UnGZPtr As Compress...

Visual Basic .NET Language • Reading compressed textfile on-the-fly

Extract the text contents from a div with a particular id

Taggy-lens allows us to use lenses to parse and inspect HTML documents. #!/usr/bin/env stack -- stack --resolver lts-7.0 --install-ghc runghc --package text --package lens --package taggy-lens {-# LANGUAGE OverloadedStrings #-} import qualified Data.Text.Lazy as TL import qualified Data.Tex...

Haskell Language • Parsing HTML with taggy-lens and lens

Read texture data

You can read texture data with function glGetTexImage: char *outBuffer = malloc(buf_size); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texture); glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, outBuffer); ...

opengl • Texturing