Tutorial by Examples: le

The Null-Coalescing operator ?? will return the left-hand side when not null. If it is null, it will return the right-hand side. object foo = null; object bar = new object(); var c = foo ?? bar; //c will be bar since foo was null The ?? operator can be chained which allows the removal of if...

Databings are essential for working with XAML. The XAML dialect for UWP apps provides a type of binding: the {x:Bind} markup extension. Working with {Binding XXX} and {x:Bind XXX} is mostly equivalent, with the difference that the x:Bind extension works at compile time, which enables better debuggi...

ndk-build NDK_PROJECT_PATH=PROJECT_PATH APP_BUILD_SCRIPT=MyAndroid.mk

Currently it contains rules for following libraries:- ButterKnife RxJava Android Support Library Android Design Support Library Retrofit Gson and Jackson Otto Crashlitycs Picasso Volley OkHttp3 Parcelable #Butterknife -keep class butterknife.** { *; } -keepnames class * { @butterk...

For enabling ProGuard configurations for your application you need to enable it in your module level gradle file. you need to set the value of minifyEnabled true. You can also enable shrinkResources true which will remove resources that ProGuard flaggs as unused. buildTypes { release { ...

public class ShakeDetector implements SensorEventListener { private static final float SHAKE_THRESHOLD_GRAVITY = 2.7F; private static final int SHAKE_SLOP_TIME_MS = 500; private static final int SHAKE_COUNT_RESET_TIME_MS = 3000; private OnShakeListener mListener; pri...

A Gemfile is the standard way to organize dependencies in your application. A basic Gemfile will look like this: source 'https://rubygems.org' gem 'rack' gem 'sinatra' gem 'uglifier' You can specify the versions of the gem you want as follows: # Match except on point release. Use only 1.5....

Make a simple GUI application in 3 easy steps. 1. Design Open Qt Creator, create a new project and make your design. Save your result as .ui file (here: mainwindow.ui). 2. Generate corresponding .py file Now you can create a .py file from your .ui file that you generated in the previous step. ...

This basic example counts at different rates on two threads that we name sync (main) and async (new thread). The main thread counts to 15 at 1Hz (1s) while the second counts to 10 at 0.5Hz (2s). Because the main thread finishes earlier, we use pthread_join to make it wait async to finish. #include ...

Checkboxes <%= check_box_tag(:pet_dog) %> <%= label_tag(:pet_dog, "I own a dog") %> <%= check_box_tag(:pet_cat) %> <%= label_tag(:pet_cat, "I own a cat") %> This will generate the following html <input id="pet_dog" name="pet_dog&q...

This is an example of a package-info.java file that binds an XML namespace to a serializable Java class. This should be placed in the same package as the Java classes that should be serialized using the namespace. /** * A package containing serializable classes. */ @XmlSchema ( xmlns = ...

Store data in SEQUENCEFILE if the data needs to be compressed. You can import text files compressed with Gzip or Bzip2 directly into a table stored as TextFile. The compression will be detected automatically and the file will be decompressed on-the-fly during query execution. CREATE TABLE raw_seque...

To enable - type: :set number or :set nu. To disable - type: :set nonumber or :set nonu. To enable enumerating relative to the cursor location - type: :set relativenumber. To disable enumerating relative to the cursor location - type: :set norelativenumber. Note: To change whether the curren...

If you don't need automatically generated apk files with unaligned suffix (which you probably don't), you may add the following code to build.gradle file: // delete unaligned files android.applicationVariants.all { variant -> variant.assemble.doLast { variant.outputs.each { output ->...

C++11 threading primitives are still relatively low level. They can be used to write a higher level construct, like a thread pool: C++14 struct tasks { // the mutex, condition variable and deque form a single // thread-safe triggered queue of tasks: std::mutex m; std::condition_variab...

Facade is structural design pattern. It hides the complexities of large system and provides a simple interface to client. Client uses only Facade and it's not worried about inter dependencies of sub-systems. Definition from Gang of Four book: Provide a unified interface to a set of interfaces i...

/** * we reuse a class written in example: * http://stackoverflow.com/documentation/sockets/2876/introduction-to-sockets#t=201607262114505531351 * pleas to familiar with it first to continue with this one **/ public class WriteToSocketExample extends ConnectSocketExample { private ...

/** * Explain briefly what method does here * @param x Explain briefly what should be x and how this affects the method. * @param y Explain briefly what should be y and how this affects the method. * @return Explain what is returned from execution. */ def method(x: Int, y: String): O...

As ES6 introduced Symbols, which are both unique and immutable primitive values that may be used as the key of an Object property, instead of using strings as possible values for an enum, it's possible to use symbols. // Simple symbol const newSymbol = Symbol(); typeof newSymbol === 'symbol' // t...

SpriteKit functionality can be implemented in a subclass of SKScene. For example, a game may implement the main game functionality within an SKScene subclass called GameScene. In Swift: import SpriteKit class GameScene: SKScene { override func didMoveToView(view: SKView) { /* Co...