Android App Final

Name 5 examples of widgets:

- Button - EditText - TextView - Spinner - Checkbox - Radio Button

Name three things that the manifest does?

- It names the Java package for the app - It describes the components of the app - the activities, services, broadcast receivers, and content providers - Identify any user permissions, such as Internet access or read-access to the user's contacts, etc... - Declare hardware/ software features used or required by the app, such as a camera, Bluetooth services,

Identify and describe at least three differences between mobile applications and typical desktop applications.*

- Mobile must be resource efficient (memory, storage, power) - Mobile applications must perform faster - Portable & use wireless (slow data transfer) - Mobile only supports viewing one screen at a time - Mobile apps have smaller screens, varying in size

Identify and describe at least three user's needs and expectations of mobile applications. *

- Speed (<60 secs) - Reliability (data whenever required) - User Friendly - Only relevant info

What are the 7 types of layouts?

1. Linear Layout 2. Relative Layout 3. Table Layout 4. Grid Layout 5. Web View 6. Frame Layout 7. Tab Layout

What can cause your activity state to be lost?

1. When you rotate the devices' orientation from portrait to landscape 2. When you launch another application and then come back 3. When you go from one Activity to another and back, within same app

Popular mobile device OS: ____% of U.S. smartphone market

52

Google claims _____________ Android device activations

900,000

"The whole code of the app will be pre-compiled during install (once), thus removing the lag that we see when we open an app on our device" describes

ART

________ replaces _________, which is the process virtual machine originally used by Android, and performs transformation of the application's bytecode into native instructions that are later executed by the device's runtime environment.

ART, Dalvik

What are the 4 activity states?

Active, Paused, Stopped, Inactive

_________ can Be faceless Be in a floating window Return a value

Activities

An activity is implemented as a subclass of __________ class.

Activity

To create an activity, you must create a subclass of ____________

Activity

What is the fundamental unit of the GUI?

Activity

a single screen of UI that appears in your app is

Activity

actions that occurs when a user interacts with widgets

Event

________ _______ are needed when an Android application may be launched to process an element of data or respond to an event, such as the receipt of a text message.

Broadcast Receivers

What is used to manage access to persisted data, such as a SQLite database?

Content providers

________ _________ play the role of database servers.

Content providers

How do you make sure that when orientation is changed, layout remains unchanged

Create Landscape Layout

Radio button needs a listener so that the app knows when it is interacted with. This is done through the ____________________________ interface

"OnCheckedChangeListener"

To set which of the Radio buttons is selected when you first open at the app use .

"android:checked="true"

True or False: Activities cannot start each other

False

True or False: You can't have a different layouts for each ViewGroup

False.

True or False: In a linear layout, the default orientation is vertical.

False. It's horizontal

True or False: Content providers are required in every application

False: No need for content provider in simple applications.

Which layout is designed to block out an area on the screen to display a single item?

FrameLayout

Which layout places its children in a rectangular grid

GridView Layout

When are content providers necessary?

In large applications that make data available to multiple activities or applications

Where do you add the method for an onClick event?

In the activity class

Android Studio is an IDE based on _________ that uses _________ build system.

IntelliJ IDEA, gradle

"each time you run an app, the part of the code required for its execution is going to be translated (compiled) to machine code at that moment" describes

JIT

Dalvik is based on________ compilation

JIT (just in time)

According to the android stats, what is currently the most used version of Android?

KitKat

invisible container that manages positions/sizes of widgets is the

Layout

Which layout arranges its children in a single column or a single row.

Linear

What is the newest version of Android?

Marshmallow

A grid with N columns has _______ grid indices

N + 1

- stays for now, but lost on shutdown / reboot describes

Non-persistence

Which method is called automatically when activity being destroyed: this method should save any non-persistence state of app;

OnSaveInstanceState()

Android operating system was developed by

Open Handset Alliance led by Google

In android _________ is used to provide access to resources defined in XML files. To access the resource we need to invoke ___________ method passing in the id of the resource to be fetched

R.java, findViewById()

ART, on the other hand, compiles the intermediate language, Dalvik bytecode, into a _________ ________ _________

System dependent binary

_________ layouts can be used for displaying tabular data or neatly aligning screen contents in a way similar to a table.

Table

True or False: Each log method can accept an additional exception argument

True

True or False: WebView does not include any features of a fully developed web browser, such as navigation controls or an address bar.

True

The ________ class serves as the base for all "widgets "

View

items that appear on screen in an Activity is

View

A ________ ________ is a data structure whose properties store the layout parameters and content for a specific rectangular area of the screen

View Object

In an Android app, GUI is built using _______ and _________ objects

View, ViewGroup

All layouts extend from ___________ class

ViewGroup

The ________ class serves as the base for subclasses called "layouts," which offer different kinds of layout architecture, like linear, tabular and relative.

ViewGroup

What two things do you need to change to make your EditText multiline?

android: singleLine="false" android: line="4"

What is the main build config file ?

build.gradle

In GridView, The grid is composed of a set of infinitely thin lines that separate the viewing area into _______. Throughout the API, grid lines are referenced by grid ______

cells, indices

A spinner is a ________ _______

dropdown list

describe the principle of least privilege

each application, by default, has access only to the components that it requires to do its work and no more. This creates a very secure environment in which an application cannot access parts of the system for which it is not given permission.

What property specifies the alignment of all the child elements?

gravity

The current state of an activity is referred to as its _______ ________

instance state

What term defines a passive data structure holding an abstract description of an action to be performed?

intent

An intent's most significant use is in the________ of activities, where it can be thought of as the _____ between activities.

launching, glue

A _________ defines the visual structure for a user interface, such as the UI for an activity or app widget

layout

By default, every application runs in its own ______ ______. Android starts the process when any of the application's components need to be executed, then shuts down the ________ when it's no longer needed or when the system must recover memory for other applications.

linux process. process

System assigns each application a unique _____ _____ _____

linux user id

What are the 6 log methods for Android?

log.i (info) log.d (debug) log.e (error) log.v (verbose) log.w (warning) log.wtf (exception)

The ______ ______ presents essential information about your app to the Android system, information the system must have before it can run any of the app's code.

manifest file

Android is a _______ _________ system, in which each ________

multi-process, process

Which method is called when an activity first starts or resumes?

onCreate()

. Both _______________ and _____________ methods receive the same Bundle that contains the instance state information.

onCreate(), onRestoreInstanceState()

What method is called when the activity is done?

onDestroy()

What method is called when the activity is in the background?

onPause()

What method is called on start, restart, or after pause

onResume()

Most security between applications and the system is enforced at the _________ level

process

When the device is in landscape orientation, Android will find and use resources in the _________________directory

res/layout-land

Android applications run in a __________ an isolated area of the operating system that does not have access to the rest of the system's resources, unless access permissions are granted by the user when the application is installed.

sandbox

a __________ should be used for any application that needs to persist for a long time

service

In a linear layout, What method do you use to set the direction of a row?

setOrientation()

Activities are maintained in a _________

stack

where are strings stored?

strings.xml

Each process has its own _______ ________, so an application's code runs in isolation from other applications.

virtual machine

What value needs to be adjusted to expand the widgets to fit the size of the parent layout?

weight

What are the 4 application building blocks?

1. Activity 2. Service 3. Content Provider 4. Intent Receiver

What are some advantages to declaring your layout in XML?

- better separate the presentation of your application from the code that controls its behavior. - modify or adapt UI descriptions without having to modify your source code -XML makes it easier to visualize the structure of your UI

All the code in a single ______ file is considered to be one application and is the file that Android-powered devices use to install the application.

.apk

What is the file extension for an Android package?

.apk

Which grid index is fixed to the leading edge of the container?

0

How many activities per tab in a Tab layout?

1

How many child views should FrameLayout hold?

1

what are the two ways you can declare a layout?

1) Declare UI elements in XML 2) Instantiate layout elements are runtime

What are the three event processing approaches?

1) Uses event-handling method specified in the layout file 2) Using anonymous inner class; 3) Using named inner class;

an ___________ typically corresponds to a single screen with a UI.

An acitivity

______ is an source Linux-based operating system intended for mobile computing platforms

Android

What subclass of Activity is the base class for activities that use the support library action bar features?

AppCompatActivity

What is faster, declaring UI in XML or at runtime?

At run-time

Which layout where the positions of the children can be described in relation to each other or to the parent?

Relative

How does the application know the initial activity to call?

Stored in the the app manifest AndroidManifest.xml

___________ layout is used to display the web page inside your Activity.

WebView

GUI control such a button or text field is a

Widget