Android Operating System Overview
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Questions and Answers

Which programming language is primarily used in Android development?

  • C++
  • Java (correct)
  • Python
  • Ruby

What is one of the key characteristics of Android's version code names?

  • They are derived from famous scientists.
  • They are based on gem stones.
  • They follow a numerical sequence.
  • They are named after dessert items in alphabetical order. (correct)

What is the API level for Android 5.0 (Lollipop)?

  • 25
  • 22
  • 21 (correct)
  • 19

Which of the following open source libraries is NOT utilized by Android?

<p>Node.js (C)</p> Signup and view all the answers

What is the main benefit of Android as a mobile development methodology?

<p>It is cheap and easy to develop applications. (C)</p> Signup and view all the answers

What is the first version of Android listed and its release date?

<p>Android 1.5 (Cupcake) - April 30, 2009 (D)</p> Signup and view all the answers

Which Android version has the API level of 16-18?

<p>Android 4.3 (Jellybean) (D)</p> Signup and view all the answers

What is the underlying kernel on which the Android operating system is based?

<p>Linux Kernel (B)</p> Signup and view all the answers

What is the primary function of Content Providers in Android?

<p>To share and manage application databases (D)</p> Signup and view all the answers

How do Intents function in Android applications?

<p>They facilitate message-passing between components (C)</p> Signup and view all the answers

What is the role of Broadcast Receivers in Android?

<p>To listen for and respond to broadcast messages (C)</p> Signup and view all the answers

Which of the following is NOT a function of Notifications in Android?

<p>To store content shared between applications (D)</p> Signup and view all the answers

What advantage do Content Providers offer regarding application boundaries?

<p>They allow data sharing across different applications (A)</p> Signup and view all the answers

Why are Notifications considered a preferred technique for user alerts?

<p>They do not interrupt the user's ongoing activities (C)</p> Signup and view all the answers

What is one of the main design considerations in creating User Interfaces for Android applications?

<p>Enhancing human-computer interaction (C)</p> Signup and view all the answers

What is the main role of the Android system when an Intent is broadcast?

<p>To determine the target components for the action (D)</p> Signup and view all the answers

What is the primary function of the View class in Android?

<p>To serve as a base for user interface elements (B)</p> Signup and view all the answers

What does a ViewGroup allow you to do in the context of Android programming?

<p>Contain multiple child Views (D)</p> Signup and view all the answers

Which of the following accurately describes an Activity in Android?

<p>Represents a single screen with a user interface (A)</p> Signup and view all the answers

Which statement about TextView is correct?

<p>It shows a read-only text label. (C)</p> Signup and view all the answers

Which control combines a TextView with a selection dialog to enable item selection?

<p>Spinner (A)</p> Signup and view all the answers

What distinguishes a RadioButton from other button types in Android?

<p>It presents options, allowing only one selection at a time. (D)</p> Signup and view all the answers

What is the main difference between EditText and TextView?

<p>EditText allows user input while TextView is read-only. (A)</p> Signup and view all the answers

Which of the following is NOT an example of a widget in Android?

<p>Activity (A)</p> Signup and view all the answers

What distinguishes Android from the iPhone in terms of hardware availability?

<p>Android is an open-source platform supporting multiple hardware devices. (B)</p> Signup and view all the answers

Which of the following applications is NOT typically preinstalled on Android phones?

<p>Gaming console emulator (D)</p> Signup and view all the answers

Which feature allows developers to incorporate Google Maps into their applications?

<p>The MapView widget (D)</p> Signup and view all the answers

What is a significant benefit of background services in Android applications?

<p>They can run silently while other apps are in use. (B)</p> Signup and view all the answers

What type of control does Android provide for using Google Maps in applications?

<p>Atomic, reusable Map control (C)</p> Signup and view all the answers

Which of these better describes Android's approach to applications compared to other mobile SDKs?

<p>A fully featured mobile application environment. (A)</p> Signup and view all the answers

Which of the following describes the Android Marketplace client?

<p>It is a platform for downloading third-party applications. (B)</p> Signup and view all the answers

What makes Android's approach to mobile applications unique?

<p>A combination of open-source software and event-driven architecture. (A)</p> Signup and view all the answers

What is the primary purpose of the btnDoneOnClick listener in the provided code?

<p>To clear the EditText after logging the input (A), To log the input from the user (B)</p> Signup and view all the answers

Which method is executed when the activity is created?

<p>onCreate() (B)</p> Signup and view all the answers

What is the significance of calling setContentView(R.layout.main) in the onCreate method?

<p>It loads the main layout for the user interface. (D)</p> Signup and view all the answers

What does the line txt1.setText('This is some text.') do?

<p>Displays a pre-defined message in the TextView. (A)</p> Signup and view all the answers

Which of the following correctly describes the role of findViewById in the code?

<p>It retrieves references to existing Views defined in the layout. (C)</p> Signup and view all the answers

In the context of this code, what happens when btn1 is clicked?

<p>The input from etxt1 is displayed in the TextView. (A)</p> Signup and view all the answers

What is the purpose of calling etxt1.setText('') after logging the input?

<p>To reset the input field for new entries. (D)</p> Signup and view all the answers

Which feature of the Android app development does the code demonstrate?

<p>Event handling through listeners (A)</p> Signup and view all the answers

Study Notes

Android Operating System Overview

  • Uses Linux OS kernel, Java programming language, and open-source libraries like SQLite, WebKit, and OpenGL.
  • Versions are identified by API levels and code names (dessert-themed), released chronologically. Examples include Android 1.5 (Cupcake), Android 2.3 (Gingerbread), Android 4.4 (KitKat), Android 7.0 (Nougat), and Android 9.0 (Pie). Each version has a corresponding API level and release year.
  • Open-source software stack with a large developer community creating applications ("apps").
  • Java applications run on a Java-based, object-oriented application framework.
  • Designed to support diverse hardware devices, unlike single-manufacturer platforms.
  • Offers a "cheap and easy" mobile development methodology due to freely available SDK and tools.

Android Native Applications and Unique Features

  • Typically includes pre-installed applications: email client, SMS manager, PIM suite, Google Maps, web browser, instant messaging client, music player, image viewer, Android Marketplace client, and Amazon MP3 store client.
  • Unique features compared to other mobile SDKs:
    • Integration with Google Maps as a reusable control for map-based applications.
    • Support for background services and applications, enabling event-driven models and continuous processing.
    • Content Providers for managing and sharing application databases across application boundaries.
    • Intents as a message-passing framework for broadcasting messages and triggering actions.
    • Broadcast Receivers for listening and reacting to broadcast Intents, ideal for event-driven applications.
    • Notifications for alerting users without interrupting current activities.

Android UI Design Fundamentals

  • Uses Views as basic UI elements (controls or widgets).
  • View Groups extend the View class, containing multiple child Views; they are used to create compound controls and layout managers (e.g., LinearLayout).
  • Activities represent windows or screens displayed to the user – analogous to forms; they are assigned a View or layout to display a UI.
  • Provides standard UI controls, widgets, and layout managers which can be extended or modified for custom functionality.

Android Widgets

  • TextView: Read-only text label supporting multiline display, formatting, and word wrapping.
  • EditText: Editable text entry box allowing multiline input and word wrapping.
  • ListView: Displays a list of items using a TextView for each.
  • Spinner: Combines a TextView with a ListView for selecting items from a list.
  • Button: Standard push button.
  • CheckBox: Two-state button (checked/unchecked).
  • RadioButton: Grouped two-state buttons where only one can be selected at a time.

Example Android Code Snippet

  • Shows basic interaction between Button, EditText, and TextView elements.
  • Uses an OnClickListener to handle the "Log it" button click.
  • In the onCreate method, gets references to UI elements defined in main.xml, sets initial text, and assigns the click listener to the button.
  • On button click, text from EditText is moved to TextView, and EditText is cleared.

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Related Documents

Module 2 Introduction to Android OS.pdf

Description

Explore the foundational aspects of the Android Operating System, including its Linux kernel roots, API levels, and diverse hardware support. Learn about its development ecosystem and the significance of the open-source community. Delve into the unique features of Android native applications and their various functionalities.

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