Android - Day3.pptx

Presentation by
Mrs.P.V.Kavitha
Assistant Professor (Sr.Gr)/ IT
SRI RAMAKRISHNA ENGINEERING COLLEGE
[Educational Service : SNR Sons Charitable Trust]
[Autonomous Institution, Accredited by NAAC with ‘A’ Grade]
[Approved by AICTE and Permanently Affiliated to Anna University, Chennai]
[ISO 9001:2015 Certified and all Eligible Programmes Accredited by NBA]
VATTAMALAIPALAYAM, N.G.G.O. COLONY POST, COIMBATORE – 641 022.
16IT2E43 – ANDROID APPLICATION DEVELOPMENT
OPEN ELECTIVE
Department of Information Technology

Syllabus
 Introduction to Mobile Application Development
 Mobility Landscape
 Mobile Platforms
 Mobile App development
 Overview of Android platform
 Setting up the Mobile App Development along with Emulator
 A case study on Mobile App Development
27-03-2023 ANDROID APPLICATION DEVELOPMENT - P.V.KAVITHA 2
MODULE 1 : GETTING STARTED WITH MOBILITY

Agenda
 Android Project App Structure
 Building My First App in Emulator
 Building My First App in Mobile Device
 Hands-on – Building My First App
 UI Resources – Layouts

App Project Structure

Exploring the folders and files in the Android
App
Java Folder
◦ This folder contains the java source code (.java) files created during the
application development
◦ MainActivity.java will be created automatically

App
res(Resources) Folder
◦ It contains all non-code resources, such as bitmap images, UI
strings, XML layouts

App
Drawable (res/drawable) Folder
It contains the different types of images as per the requirement of
application
Layout folder
It contains all XML layout files which we used to define the user
interface of our application

App
Mipmap Folder (res/mipmap)
This folder contains app / launcher icons that are used to show on
the home screen

App
Values Folder (res/values)
This folder contains various XML files, such as strings, colors, style
definitions and a static array of strings or integers

App
Manifests Folder
This folder contains a manifest file
(AndroidManifest.xml) for our android
application.
This manifest file contains information
about the application such as android
version, access permissions, etc. of the
application and its components.
The manifest file will act as an
intermediate between android OS and
our application

App
Gradle Scripts
In android, Gradle means automated
build system and by using this we can
define a build configuration that
applies to all modules in our
application
In Gradle build.gradle (Project),
and build.gradle (Module) files are
useful to build configurations that
apply to all our app modules or
specific to one app module

App
Android Layout File
(activity_main.xml)
The UI of our application will be
designed in this file and it will
contain Design and Text modes.

App
Android Main Activity File
(MainActivity.java)
The main activity file in the android
application is MainActivity.java and it exists
in the java folder
The MainActivity.java file contains the java
code to handle all the activities related to our
app.

My First Android App in Emulator

My First Android App in Mobile device
◦ Connect your Mobile device with Laptop using USB cable
◦ Perform the following steps to enable USB debugging in the Developer options window:
◦ Open the Settings app.
◦ If your device uses Android v8.0 or higher, select System. Otherwise, proceed to the next
step.
◦ Scroll to the bottom and select About phone.
◦ Scroll to the bottom and tap Build number seven times.
◦ Return to the previous screen, scroll to the bottom, and tap Developer options.
◦ In the Developer options window, scroll down to find and enable USB debugging.
◦ Run the app on your device as follows:
◦ In Android Studio, select your app from the run/debug configurations drop-down menu in
the toolbar.
◦ In the toolbar, select the device that you want to run your app on from the target device drop-
down menu.

My First Android App in Mobile device

UI Layouts
Commonly used Attributes of UI Layout:
android :id
This is the ID which uniquely identifies the layout
android : layout_width = match_parent
Adjusts the width of the layout to the mobile screen
android: layout_height = match_parent
Adjusts the height of the layout to the mobile screen
android:gravity
This specifies how an object should position its content, on both the X and Y axes.
Possible values are top, bottom, left, right, center, center_vertical, center_horizontal etc.
android:orientation
This specifies the direction of arrangement and you will use "horizontal" for a row,
"vertical" for a column. The default is horizontal

UI Controls/Components/Widgets
• Input controls are the interactive components in app's user interface
• Android provides a wide variety of controls such as buttons, text fields, edit text,
check box, radio button, toggle buttons, and many more
Some of the UI controls are:

UI Controls/Components/Widgets
TextView : This control is used to display text to the user
EditText : This control is used to get the input from the user
Button : A push-button that can be pressed, or clicked, by the user to perform an action
RadioButton: The RadioButton has two states: either checked or unchecked.
CheckBox: An on/off switch that can be toggled by the user. You should use check box
when presenting users with a group of selectable options that are not mutually exclusive.
ToggleButton: An on/off button with a light indicator
RadioGroup : A RadioGroup is used to group together one or more RadioButtons
ListView: It contains the group of items and displays in a scrollable list

Event Handling model
Event Handling Model
Events are a useful way to collect data about a user's interaction with interactive
components of applications

ANDROID APPLICATION DEVELOPMENT - P.V.KAVITHA
27-03-2023 31

Android - Day3.pptx

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