Tutorial by Topics: in

int read(byte[] b) throws IOException Note that most of the time you do NOT use InputStreams directly but use BufferedStreams, or similar. This is because InputStream reads from the source every time the read method is called. This can cause significant CPU usage in context switches into an...

Setup Before using data binding, you must enable the plugin in your build.gradle. android { .... dataBinding { enabled = true } } Note: Data binding was added to the Android Gradle plugin in version 1.5.0 Binding class names The data binding plugin generates a bind...

Note that a ViewTreeObserver instance associated with a View instance can become invalid while that View is still alive. From the View.getViewTreeObserver javadocs: // The returned ViewTreeObserver observer is not guaranteed to remain // valid for the lifetime of this View. If the caller of this...

Concurrent computing is a form of computing in which several computations are executed concurrently instead of sequentially. Java language is designed to support concurrent programming through the usage of threads. Objects and resources can be accessed by multiple threads; each thread can potentiall...

The Lint tool checks your Android project source files for potential bugs and optimization improvements for correctness, security, performance, usability, accessibility, and internationalization. You can run Lint from the command-line or from Android Studio. Official documentation: https://dev...

A singleton is a class that only ever has one single instance. For more information on the Singleton design pattern, please refer to the Singleton topic in the Design Patterns tag.

public type name[ = value]; private type name[ = value]; protected type name[ = value]; type name[ = value]; public class name{ class name{ From the Java tutorial: Access level modifiers determine whether other classes can use a particular field or invoke a particular method. There a...

Autoboxing is the automatic conversion that Java compiler makes between primitive types and their corresponding object wrapper classes. Example, converting int -> Integer, double -> Double... If the conversion goes the other way, this is called unboxing. Typically, this is used in Collections ...

Documentation for java code is often generated using javadoc. Javadoc was created by Sun Microsystems for the purpose of generating API documentation in HTML format from java source code. Using the HTML format gives the convenience of being able to hyperlink related documents together. /** -- ...

new Socket("localhost", 1234); //Connects to a server at address "localhost" and port 1234 new SocketServer("localhost", 1234); //Creates a socket server that can listen for new sockets at address localhost and port 1234 socketServer.accept(); //Accepts a new Socket...

FileOutputStream openFileInput (String name) FileOutputStream openFileOutput (String name, int mode) File(File dir, String name) File(String path) File getExternalStoragePublicDirectory (String type) File getExternalFilesDir (String type) ParameterDetailsnameThe name of the file to ope...

Nashorn is a JavaScript engine developed in Java by Oracle, and has been released with Java 8. Nashorn allows embedding Javascript in Java applications via JSR-223 and allows to develop standalone Javascript applications, and it provides better runtime performance and better compliance with the ECMA...

ParameterDetailsJNIEnvPointer to the JNI environmentjobjectThe object which invoked the non-static native methodjclassThe class which invoked the static native method Setting up JNI requires both a Java and a native compiler. Depending on the IDE and OS, there is some setting up required. A guide...

RMI requires 3 components: client, server and a shared remote interface. The shared remote interface defines the client-server contract by specifying the methods a server must implement. The interface must be visible to the server so that it can implement the methods; the interface must be visible...

SQL is Structured Query Language used to manage data in a relational database system. Different vendors have improved upon the language and have variety of flavors for the language. NB: This tag refers explicitly to the ISO/ANSI SQL standard; not to any specific implementation of that standard. ...

JavaScript (not to be confused with Java) is a dynamic, weakly-typed language used for client-side as well as server-side scripting. JavaScript is a case-sensitive language. This means the language considers capital letters to be different from their lowercase counterparts. Keywords in JavaScri...

PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source programming language. It is especially suited for web development. The unique thing about PHP is that it serves both beginners as well as experienced developers. It has a low barrier to entry so it is easy to ge...

Notes 1- You do not need an Apple Developer Account to start developing iOS Apps. The documentation and tools are free to download with your Apple ID. You can also sign and install apps on your personal devices using that same Apple ID. If you want to distribute or sell apps on the App Store,...

Python is a widely used programming language. It is: High-level: Python automates low-level operations such as memory management. It leaves the programmer with a bit less control but has many benefits including code readability and minimal code expressions. General-purpose: Python is b...