Tutorial by Examples: ad

How to add Firebase Crash Reporting to your app

In order to add Firebase Crash Reporting to your app, perform the following steps: Create an app on the Firebase Console here. Copy the google-services.json file from your project into your in app/ directory. Add the following rules to your root-level build.gradle file in order to inc...

Android • Firebase Crash Reporting

Load HTML string

Web views are useful to load locally generated HTML strings. NSString *html = @"<!DOCTYPE html><html><body>Hello World</body></html>"; [webView loadHTMLString:html baseURL:nil]; Swift let htmlString = "<h1>My First Heading</h1><p&gt...

iOS • UIWebView

Make an Image tappable by adding a TapGestureRecognizer

There are a couple of default recognizers available in Xamarin.Forms, one of them is the TapGestureRecognizer. You can add them to virtually any visual element. Have a look at a simple implementation which binds to an Image. Here is how to do it in code. var tappedCommand = new Command(() => {...

Xamarin.Forms • Gestures

Adding a map in Xamarin.Forms (Xamarin Studio)

You can simply use the native map APIs on each platform with Xamarin Forms. All you need is to download the Xamarin.Forms.Maps package from nuget and install it to each project (including the PCL project). Maps Initialization First of all you have to add this code to your platform-specific project...

Xamarin.Forms • Working with Maps

Splitting a string using a delimiter

Use the System.String.Split method to return a string array that contains substrings of the original string, split based on a specified delimiter: string sentence = "One Two Three Four"; string[] stringArray = sentence.Split(' '); foreach (string word in stringArray) { Console.W...

C# Language • String Manipulation

GADTs

Conventional algebraic datatypes are parametric in their type variables. For example, if we define an ADT like data Expr a = IntLit Int | BoolLit Bool | If (Expr Bool) (Expr a) (Expr a) with the hope that this will statically rule out non-well-typed conditionals, this...

Haskell Language • Common GHC Language Extensions

How to add Facebook Login in Android

Add below dependencies to your build.gradle // Facebook login compile 'com.facebook.android:facebook-android-sdk:4.21.1' Add below helper class to your utility package: /** * Created by Andy * An utility for Facebook */ public class FacebookSignInHelper { private static final...

Android • Facebook SDK for Android

Load JDBC Driver

For accessing the MS SQL Server database Sqoop requires an additional JDBC driver which can be downloaded from Microsoft. The following steps will install MSSQL Server JDBC driver to Sqoop: wget 'http://download.microsoft.com/download/0/2/A/02AAE597-3865-456C-AE7F-613F99F850A8/sqljdbc_4.0.2206.100_...

sqoop • Connecting Sqoop to other databases/datastores

Import data directly into Hive Warehouse

The data can be imported directly into Hive: sqoop import --hive-import --table EventLog --connect "jdbc:sqlserver://192.168.1.99:1433;database=Test_db" --username user --password password --split-by id ...

sqoop • Connecting Sqoop to other databases/datastores

Passing down props using spread operator

Instead of var component = <Component foo={this.props.x} bar={this.props.y} />; Where each property needs to be passed as a single prop value you could use the spread operator ... supported for arrays in ES6 to pass down all your values. The component will now look like this. var compon...

React • Props in React

Writing Functions with Advanced Lifecycle

This example shows how a function can accept pipelined input, and iterate efficiently. Note, that the begin and end structures of the function are optional when pipelining, but that process is required when using ValueFromPipeline or ValueFromPipelineByPropertyName. function Write-FromPipeline{ ...

PowerShell • Working with the PowerShell pipeline

A Simple Read-only Table to View Data from a Model

This is a simple example to display read-only data that is tabular in nature using Qt's Model/View Framework. Specifically, the Qt Objects QAbstractTableModel (sub-classed in this example) and QTableView are used. Implementations of the methods rowCount(), columnCount(), data() and headerData() are...

Qt • Model/View

Parsing and navigating a document using the DOM API

Considering the following document : <?xml version='1.0' encoding='UTF-8' ?> <library> <book id='1'>Effective Java</book> <book id='2'>Java Concurrency In Practice</book> </library> One can use the following code to build a DOM tree out of a St...

Java Language • XML Parsing using the JAXP APIs

Parsing a document using the StAX API

Considering the following document : <?xml version='1.0' encoding='UTF-8' ?> <library> <book id='1'>Effective Java</book> <book id='2'>Java Concurrency In Practice</book> <notABook id='3'>This is not a book element</notABook> </librar...

Java Language • XML Parsing using the JAXP APIs

Install ADB on Linux system

How to install the Android Debugging Bridge (ADB) to a Linux system with the terminal using your distro's repositories. Install to Ubuntu/Debian system via apt: sudo apt-get update sudo apt-get install adb Install to Fedora/CentOS system via yum: sudo yum check-update sudo yum install androi...

Android • ADB (Android Debug Bridge)

GradientBoostingClassifier

Gradient Boosting for classification. The Gradient Boosting Classifier is an additive ensemble of a base model whose error is corrected in successive iterations (or stages) by the addition of Regression Trees which correct the residuals (the error of the previous stage). Import: from sklearn.ensem...

scikit-learn • Classification

Adding simple Splash Screen

Follow this steps for adding splash screen into WPF application in Visual Studio: Create or get any image and add it to your project (e.g. inside Images folder): Open properties window for this image (View → Properties Window) and change Build Action setting to SplashScreen value: R...

wpf • Creating Splash Screen in WPF

Simple add converter [IMultiValueConverter]

Show how to create simple IMultiValueConverter converter and use MultiBinding in xaml. Get summ of all values passed by values array. public class AddConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { ...

wpf • Value and Multivalue Converters

Read a line verbatim

$ IFS= read -r foo <<EOF > this is a \n line >EOF $ printf '%s\n' "$foo" this is a \n line

sh • The `read` command

Read a line, stripping leading and trailing whitespace

$ read -r foo <<EOF > this is a line >EOF $ printf '%s\n' "$foo" this is a line

sh • The `read` command