Android Development Basics

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Questions and Answers

What is the primary purpose of using the `findViewById(int resourceIdentifier)` method?

To attach layouts at runtime

To retrieve a view object by its ID (correct)

To instantiate layout elements

To declare UI elements in XML

Which unit of measurement is recommended for defining layouts to ensure consistency across different screen densities?

mm (millimeters)

pt (points)

px (pixels)

dp (density-independent pixels) (correct)

What type of objects are View and ViewGroup in Android?

UI components (correct)

Data containers

Memory handlers

Layout managers

What must be done before calling `findViewById()` to access UI elements in an Activity?

Set the layout file using <code>setContentView()</code> Signup and view all the answers

What is the main difference between dp and sp in Android development?

dp is based on display density, while sp scales with user font preference Signup and view all the answers

What is the primary orientation options for a LinearLayout?

Horizontal or vertical Signup and view all the answers

Which attribute is used to control how much space a view should occupy within a LinearLayout?

android:layout_weight Signup and view all the answers

In a FrameLayout, where are elements positioned by default?

Top-left corner Signup and view all the answers

Which class is NOT an example of a complex visual control in Android?

TextView Signup and view all the answers

What method is used to bind an adapter to a ListView?

setAdapter() Signup and view all the answers

What property of a ScrollView allows it to fill the entire available view?

android:fillViewport Signup and view all the answers

Which of the following is an example of an adapter type that extends BaseAdapter?

SimpleAdapter Signup and view all the answers

What is the function of the `android:layout_span` attribute in a TableLayout?

To specify how many columns a cell should span Signup and view all the answers

What kind of data source can an ArrayAdapter utilize?

ArrayList Signup and view all the answers

Which layout allows you to specify the position of child elements relative to each other and the parent?

RelativeLayout Signup and view all the answers

Which control is specifically associated with displaying a list of items and allows selection?

Spinner Signup and view all the answers

What is the purpose of the `android:scrollbars` attribute in a ScrollView?

To manage vertical or horizontal scrolling Signup and view all the answers

Which adapter is specifically designed to work with a database cursor?

CursorAdapter Signup and view all the answers

Which layout is derived from LinearLayout and uses TableRows for organizing its children?

TableLayout Signup and view all the answers

What kind of view does a ListActivity provide access to?

getListView() Signup and view all the answers

Which method would you use to set an adapter for a ListFragment?

setListAdapter() Signup and view all the answers

What is a primary condition that can trigger an Application Not Responding (ANR) error in Android?

The app does not respond to input events within 5 seconds. Signup and view all the answers

Which method is NOT typically used for handling asynchronous operations in Android?

Synchronous calls Signup and view all the answers

What is one key issue that arises when implementing asynchronous operations?

Thread communications and data exchange. Signup and view all the answers

What would be a potential consequence of performing a long calculation on the main thread?

The application will enter into an ANR state. Signup and view all the answers

What is essential when working with I/O related operations in Android’s main thread?

They should be executed on a separate thread to prevent blocking the UI. Signup and view all the answers

What is the primary purpose of the doInBackground() method in the AsyncTask class?

To perform resource-intensive operations asynchronously Signup and view all the answers

What does the onProgressUpdate() method do in the context of an AsyncTask?

It receives and updates the UI with progress data from doInBackground() Signup and view all the answers

Which method is executed right after initializing a call to AsyncTask?

onPreExecute() Signup and view all the answers

How does the execute(params) method in AsyncTask handle its parameters?

It can only process object type values Signup and view all the answers

What is the sequence of method calls when using an AsyncTask?

onPreExecute() -> doInBackground() -> onProgressUpdate() -> onPostExecute() Signup and view all the answers

What must be done inside the onPreExecute() method?

Initialize anything needed to display progress Signup and view all the answers

In the HeavyTask class, what kind of arguments does the doInBackground() method accept?

An array of strings as variable arguments Signup and view all the answers

What is the effect of calling publishProgress() within the doInBackground() method?

It triggers the onProgressUpdate() method Signup and view all the answers

What method is called before an activity is destroyed to save its intermediate state?

onSaveInstanceState() Signup and view all the answers

Which of the following activity states indicates that the activity is currently running and visible to the user?

Active Signup and view all the answers

What type of Intent requires a specific class name to launch an activity?

Explicit Intent Signup and view all the answers

Which of the following is NOT a basic component of an Android App?

LayoutFile Signup and view all the answers

What is the role of the android.app.Activity class?

To serve as a primary interface component for user interactions. Signup and view all the answers

What method would you use to retrieve a string extra from an Intent?

getStringExtra() Signup and view all the answers

What lifecycle method is called when an activity becomes partially visible to the user?

onPause() Signup and view all the answers

Which of the following states signifies that an activity has been completely destroyed?

Killed Signup and view all the answers

How do you attach additional data to an Intent?

using putExtra() method Signup and view all the answers

What is the purpose of the android.content.Context class?

To provide access to application-specific resources. Signup and view all the answers

Which method is used to start an activity that expects a result?

startForResult() Signup and view all the answers

What lifecycle method represents the state where an activity is about to become visible again after being stopped?

onRestart() Signup and view all the answers

What type of Intent is sent to all registered Broadcast Receivers without a specific target?

Normal Intent Signup and view all the answers

Which method do you override to handle configuration changes such as device orientation?

onConfigurationChanged() Signup and view all the answers

Study Notes

Mobile Devices and Applications

This unit covers Android basics, objectives, evaluation, and an agenda for the course.

Objectives

Efficient use of mobile technologies in the information society context.
Understanding the principles of mobile devices.
Learning and achieving Android development skills.

Evaluation

Course activity: 50%
- Final quiz exam: 50%
- Laboratory activity: 50%
  - 2 Partial Evaluations: 30%
  - Ongoing evaluation: 20%
Final evaluation: January ???, 2023
All evaluation activities must be passed with a minimum of 50% from the total number of points.
Minimum 70% laboratory attendance.
Minimum 2.5/5 points for attending the final exam.

Agenda

Mobile devices
Android framework
Development instruments
Android application structure

Learning Path

Mobile devices (architecture, characteristics, limitations)
Mobile OS (functions, user interfaces, applications)
Mobile apps (life cycle, resources, components)
Android developer skills

Mobile Devices

Social networking (managing personal content, contacts, agenda, calendar)
Internet browsing
Entertainment & Multimedia (games, virtual books, movies, images, music)
Communication (e-mails, messages, voice services)
Navigation (GPS, localization)
Financial transactions
Characteristics of mobile devices (portability, usability, performance, communication, security)
Mobile device limitations (dimensions, screen, keyboard, autonomy, battery life, performance, memory, bandwidth, user experience, form factor)
Mobile devices trends (fast and reach full development, evolution of prices, hardware and software performances, increased usability)
Hardware characteristics (processor, memory, screen, data gathering, connectivity)

Smartphone

System on a Chip (SoC)
Flash Memory
RAM
Power supply
Communication Processor
CPU
GPU
Screen
I/O devices
SIM
Audio

SoC

Application processor (CPU)
Memory interface
Graphic processor (GPU)
USB controller
Serial interface
Bluetooth controller
Wi-Fi controller
Camera interface
RISC architecture
ARM and Intel
32/64 bits
Working frequencies (around 2.7 GHz)
One, dual, quad, or octa-core processor
Low power consumption
Marvell: PXA
Texas Instruments: OMAP
Samsung: S3C, S5C, S5P
Qualcomm: MSM, QSD
nVidia: Tegra

Memory

Random Access Memory (RAM)
Internal non-volatile memory (Flash, NOR, NAND)
External memory (SD cards)

Screen

Technology (LCD TFT, LCD IPS, OLED, AMOLED, Retina, Gorilla Glass)
Resolution (1080 x 2340 pixels)
Pixel density (432 ppi)
Ratio (19.5:9)
Number of colours (16M)

Data Input Solutions

Touchscreens (virtual keyboard, numeric keyboard, mini-joystick, QWERTY keyboard, swiping, vocal commands, fingerprint, face recognition)

Connectivity

Voice services
Data connection
Area coverage
Small - NFC / Bluetooth
Extended - Wi-Fi (802.11 a/b/g/n/ac)
Wireless connectivity (WPAN, WLAN, WWAN)

Wireless Connectivity

WPAN (9.6 Kbps – 3 Mbps)
WLAN (1 – 300 Mbps)
WWAN (8 Kbps – 300 Mbps)

WWAN (GSM)

CSD (Circuit-Switched Data)
HSCSD (High Speed Circuit-Switched Data)
GPRS (General Packet Radio Services)
EDGE (Enhanced Data Rates for Global Evolution)
UMTS (Universal Mobile Telecommunications System)
HSDPA (High Speed Downlink Packet Access)
HSUPA (High Speed Uplink Packet Access)
LTE (Long Term Evolution)

Studying That Suits You

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Description

Test your knowledge on fundamental Android development concepts. This quiz covers key topics such as UI elements, layout measurements, and view positioning techniques essential for creating user interfaces in Android applications.