Java and android

widget

"ready to use" UI element

Application Programming Interface (API)

A set of software routines that allows one software system to work with another.

Data Encapsulation

A technique for bundling multiple named variables into a single object.

local variable

A variable with local scope is one that can only be seen, used and updated by code within the same scope.

What is aapt

Android Asset Packaging Tool: a tool to help view, create, and update APK

APK

Android Package File. package file format used by the Android operating system

ART

Android runtime. The Dalvik Virtual Machine is in the same level as the Native Libraries and allows every Android app to run its own processes.

primitive data type

Basic items that are not objects.

Heap

Heap is used for dynamic memory allocation.

JDK

Java Development Kit. A software development environment for writing in Java .

JRE

Java Runtime Environment (JRE) This allows you to execute Java programs

JVM

Java Virtual Machine, an interpreter for compiled Java bytecodes.

Objects

Object is a container that gathers together some data and some behavior.

garbage collection

Releases memory that was used for a variable's value

Bytecode

Set of instructions composed of compact numeric codes, constants, and references that can be efficiently processed by an interpreter.

State vs Behavior

States refer to features of an object, and more than likely fields. They differ from behaviors, or methods, the latter describing actions that an entity can take.

Java API

The Java Applications Programming Interface that specifies the wide variety of classes that come with the Java platform.

Event handling

The act of coding events to handle each procedure.

super class

The class that is defined first, and other classes inherit from it

Overloading

The process of using the same operator symbol or identifier to refer to a different function

view

a base class for all UI elements

what is Javac Helloworld.c

a compiler

Reference variables

a data type whose instances are not stored directly in that type

What is a callback function?

a function that is passed to a function as a parameter

variable

a piece of data

instance variable

a variable defined in a class

what is the relationship between a view and a widget

a widget is an extension of a view

override

allows a subclass to provide a specific implementation of a method that is already provided by one of its superclass

event

an action that occurs as a result of the user or another source

what is Java Helloworld

an executable

What is Android?

an operating system which is based on Linux with a Java programming interface for cell/smartphones

why are callback functions important

asynchronous programming, including waiting for a user request

interface (in Java)

collection of abstract methods

Android API

collection of software modules that makeup android sdk

Activity Lifecycle

collection to methods used to transition between activities

Composition

combination of several operations into a single line of code

efficiency

conveying maximum amount of information with minimum level of activity

Why does Android with XML

creating the UI elements

what is an attrabute

describes some charatistic of data

setContentView

displays content for your Activity UI by looking at the view class/.xml

package

is a namespace that organizes a set of related classes and interfaces

why is java slower then native code

it needs a vm to run

activation record

keeps track of values as a program execute

common layouts

linear, relative, and web

what activity methods can be over ridden

onCreate()

what is inflation

parsing XML and turning it into UI-oriented data structures.

parameters

passed by values

Signature of a method

refers to writing the method name with its parameters without the return type of the method. ex function prototype

Activity

represents a single screen with a UI

runtime stack

the area of memory that stores local variables and parameters for active function calls

Activity State

the current run status of an activity ex. START, PAUSE, STOPPED, DESTROYED

inheritance (in Java)

the is a relationship between a more general superclass and a more specialized subclass

Subclass

the subordinate or more specialized class in a generalization/specialization relationship

OnClickListener

used to detect clicks from mouse

class variable

variables declared with the static keyword in a class

viewGroup

viewgroup is a subclass of View and act as a base class for layouts and layouts parameters.