Mobile Development: Android Components and Storage

• Exam for I3350- Mobile Development on 5/2/2024, lasting 90 minutes, instructed by Dr. Rami Tawil

Local Data Storage in Android

• SQLite database files are used for storing local data

AndroidManifest.xml Purpose

• It specifies the app's required permissions and components

Intents in Android

• Intents are messages used to pass data between components

UI Management Component

• Activity is responsible for managing the app's user interface and handling user interactions

BroadcastReceiver Role

• Receives and responds to broadcast messages

Non-Layout Manager

• ViewManager is not a layout manager

Activity Visibility Method

• onStop() gets called when an Activity is no longer visible

"R.java" File Role

• Generates unique resource IDs

Background Task Component

• Service is used for background tasks the run independently of the UI

Android Virtual Device (AVD) Purpose

• Simulates a physical Android device for testing

"res" Directory Role

• Manages app resources (layouts, images, strings)

Activity Definition

• Activity constitutes a user interface component

Method for Invisible Activity

• onStop() is called when an Activity is no longer visible

Inter-Process Communication Component

• ContentProvider is used for inter-process communication

setContentView() Purpose

• Sets the content view to a specific layout

Explicitly Finishing an Activity

• finish() explicitly concludes an Activity

Method Called on Back Navigation

• onBackPressed() is invoked when navigating back

Android Activity Lifecycle: onPause()

• onPause() gets called when the Activity is partially visible

Passing Data Between Activities

• Intents are one way of passing data between two Activities

onSaveInstanceState() Purpose

• Saves the current state of the Activity

Launching Implicit Intents

• startActivity() can launch an implicit Intent.

Explicit vs Implicit Intents

• Explicit Intent specifies the component to start by class name
• Implicit Intent specifies the action to perform

UI Component Initialization Method

• onCreate() initializes the UI components in an Activity

Android Activity Lifecycle: onRestart()

• onRestart() is called when the Activity is restarted after being stopped

Android Service Definition

• An Android service is a background task that runs without a UI

Method to Start Service

• startService() starts a service

Stopping a Service

• Services can be stopped using stopService()
• They can also stop automatically when the app is closed.

Non-Android Service Type

• Background service is not a recognized Android service type

onBind() Method Purpose

• The onBind() method is used to unbind a service.

Required Service Permission

• <uses-permission> is needed to start a service declared in the manifest file

Activity-Service Communication

• Communication can occur through broadcast receivers
• Communication also proceeds by utilizing the bindService() method

Foreground Service Purpose

• Provides a persistent notification for long-running tasks

Service Creation Method

• onCreate is called when a service is first created

onStartCommand() Purpose

• Handles incoming intents

Bound Service Characteristics

• Bound services are bound to a component using bindService()

Passing Data from Activity to Service

• Data can be passed through intent extras
• Data can also be passed in via global variables

Service Lifecycle Initialization

• onCreate() is appropriate for one-time initialization.

Inter-Application Service Communication

• Can be achieved by using a bound service

Sticky Service Characteristics

• It restarts automatically if terminated

Remote Service Purpose

• The primary purpose of a remote service is to allow inter-process communication

Broadcast Receiver Class

• BroadcastReceiver is used to register a receiver of broadcasts

Intent in BroadcastManager Purpose

• It defines an operation to be performed

Method to Send Broadcast

• sendBroadcast() sends broadcasts

Sticky Broadcast Defined

• A broadcast that remains active even after being sent

Dynamic BroadcastReceiver Registration

• Register dynamically in code with registerReceiver()

LocalBroadcastManager Purpose

• Handles broadcasts within an application's components

IntentFilter Purpose

• It specifies which broadcasts a component can receive

Background BroadcastReceiver

• It depends on the type of broadcast whether a BroadcastReceiver can receive broadcasts in the background

Non-Standard Broadcast Action

• ACTION_WIFI_CONNECT is not a standard broadcast action

setPackage() Method Purpose

• Filters broadcasts based on the sender's package

Components Communicating with Intents

• Activities, services, and broadcast receivers can all communicate through Intents

Explicit Intent Definition

• It specifies the component to start

Intent Action Representation

• Represents the type of operation to be performed

Starting Activity with Explicit Intent

• startActivity() starts a new activity

Intent Filter Purpose

• They filter incoming Intents based on specified criteria

Adding Data to an Intent

• setData() adds data to an Intent

Main Advantage of Fragments

• Fragments enable reusability and modularity of code

Fragment Destruction Lifecycle Method

• onDestroyView() is called when a fragment is being destroyed

Passing Data to Fragments

• Data can be passed through Intent extras

Passing Data to other Activities

• putExtra() passes data to other activities

Android Snackbar Code Meaning

• LENGTH_LONG determines how long the Snackbar message appears

Android Startup Activity Image

• MainActivity is the startup activity

Android TextView and Button Code Update

• Provide the code and initialize views for a TextView and Button to update the text when clicked

Code to Pass a message

• Provide the code to pass a message from one activity to another to display in a TextView.

SQLite Database

• Complete the code to create an SQLite database named "MyDatabase"
• A table named "Students" is created that stores student information
• Fields include id, name, and grade

Student Insertion Method

• Write a method to insert a new student into the "Students" table

Student Retrieval Method

• Write a method to retrieve all students from the "Students" table

Student Grade Update Method

• Write a method to update the grade of a specific student in the "Students" table

Student Delete Method

• Write a method to delete a student from the "Students" table based on their ID