Bluetooth chat Application using Java and Android studio

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International Journal of Novel Research and Development (www.ijnrd.org)

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Bluetooth chat Application using Java and Android

studio

DONE BY

V.Eswar sai,D.Roshini,K.sivaji,K.Yeswanth kumar,T.Manohar,Subham kumar

Students of Visakha Institute of Engineering and Technology

Computer Science Engineering

Visakhapatnam,Andhra pradesbh

Under the guidance of Under the guidance of

SOUJANYA A.S.C TEJASWINI KONE

Faculty of Computer Science Engineering HOD of Computer Science Engineering

Visakhapatnam,Andhra pradesbh Visakhapatnam,Andhra pradesbh

Abstract

In the era of mobile communication,

Bluetooth technology has become ubiquitous,

enabling seamless wireless data exchange

between devices. This project proposes the

development of a Bluetooth chat application

using Java and Android Studio. The

application aims to provide a platform for

users to exchange messages in real-time over

Bluetooth connections.

The proposed application will leverage the

Android platform's Bluetooth API to facilitate

communication between devices. Users will be

able to discover nearby Bluetooth-enabled

devices, establish connections, and exchange

text messages within a user-friendly chat

interface.

experience by configuring settings such as

notification preferences, message fonts, and

chat themes.

Introduction

Bluetooth is a wireless communication

technology that enables the wireless

transmission of data over short distances.

Bluetooth can communicate with 2.4 GHz

using radio frequencies. Bluetooth technology

can reach up to 10 meters of shooting capacity

in an open area. Data transfer speeds between 1

Mbps and 721 Kbps are achieved in transfers

with Bluetooth.

“Bluetooth Chat application” is an android

application that is used to send and receive

messages. We can chat with our friend if we are

in Bluetooth range and don’t have access to the

internet. Also, teachers will able to send notes

to multiple students via Bluetooth Chat

application and able to teach them. It will be

helpful to students if there is no wi-fi in your

school, for travelers to chat between tents in

mountains, and in many other cases.

Bluetooth is a technology designed by

Ericsson in 1994 to wirelessly connect devices.

It is used to exchange data among devices

within short range, usually 10 metres. Bluetooth

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operates in the frequency range 2400 MHz to

2483.5 MHz which is the ISM unlicensed band.

Bluetooth uses the concept of frequency

hopping to avoid collisions. It usually performs

1500 hops per second[3].

Bluetooth exchange data using the

concept of packets. The architecture used by

Bluetooth is master-slave architecture. One

master can communicate with maximum 7

slaves in a piconet structure. In order to connect

more than 7 slaves a scatternet needs to be

formed. When more than one slave is

connected then bluetooth operates in round-

robin fashion. Typically, the master switches

from one device to another for a fixed period of

time[3].

There are several applications of

bluetooth out of which few are mentioned

below:

a) Connecting two nearby computers for data

exchange.

b) Wireless communication with tablets and

speakers such as iOS and Android devices.

c) Sending small advertisements from

Bluetooth-enabled advertising hoardings to

other, discoverable, Bluetooth devices.

d)Transfer of files, contacts and other

information.

e) Wireless control of and communication

between a mobile phone and a handsfree

headset.

Some of the limitations of Bluetooth

technology are mentioned below:

a) As compared to Wi-Fi, which

transfer data at 54 Mbps, Bluetooth

comparatively slower and its transfer rate is

about 3 Mbps.

b) Distance Limitations: For a

bluetooth hardware device installed in our

computers or mobile devices, the range is upto

30 feet which sometimes be too short.

c) Interference: Since bluetooth

operates in the unlicensed frequency spectrum,

interference among Bluetooth signals is

possible.

Obective:

1. Enable Wireless

Communication: Facilitate seamless

communication between Android devices

without the need for an internet connection,

relying solely on Bluetooth technology for data

exchange.

2. User-Friendly Interface:

Design an intuitive and visually appealing user

interface (UI) that makes it easy for users to

compose and send messages, view received

messages, and manage their chat conversations.

3. Real-Time Messaging: Enable

real-time messaging capabilities, allowing

users to send and receive messages instantly,

with minimal latency, creating an interactive

chat experience.

4. Bluetooth Connectivity:

Implement robust Bluetooth connectivity

features to enable device discovery, pairing,

and connection establishment between nearby

devices. Ensure compatibility with a wide range

of Android devices and Bluetooth protocols.

5. Message Handling: Develop

mechanisms for encoding, transmitting,

receiving, and displaying messages within the

chat application. Handle various message

formats, including text messages, emojis, and

multimedia attachments.

6. Security and Privacy:

Prioritize the security and privacy of user data

by implementing encryption algorithms and

authentication mechanisms to secure message

transmission over Bluetooth connections.

Prevent unauthorized access to message content

and protect user privacy.

7. Offline Messaging: Support

offline messaging functionality by caching

messages when devices are out of range or

disconnected, and delivering them once the

connection is re-established. Ensure seamless

message synchronization between devices.

8. Error Handling and Resilience:

Implement error handling mechanisms to

address common Bluetooth communication

issues, such as connection drops, signal

interference, and device unavailability. Provide

informative error messages and graceful

recovery strategies to enhance user experience.

Customization Options: Offer

customization options to users, allowing them

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to personalize their chat experience by

configuring

1. settings such as notification

preferences, message fonts, and chat themes.

2. Scalability and Reliability:

Build a scalable and reliable chat application

architecture that can handle increasing user load

and maintain consistent performance under

varying network conditions. Ensure backward

compatibility with older Android versions and

support for future updates.

HARDWARE&SOFTWARE

REQUIREMENT

Hardware Requirements:

1. Android Device: You'll need at least

one Android device to run and test your

Bluetooth chat application. It's recommended to

have multiple devices for testing

communication between them.

2. Bluetooth Module (Optional): If you

want to test Bluetooth communication with

external hardware like Arduino or other

Bluetooth-enabled devices, you might need a

Bluetooth module compatible with your

hardware.

Software Requirements:

1. Android Studio: Android Studio is the

official Integrated Development Environment

(IDE) for Android app development. Make sure

you have it installed on your development

machine.

2. Java Development Kit (JDK): Android

development primarily uses Java. Ensure that

you have the latest JDK installed on your

system.

3. Android SDK: Android SDK is

necessary for Android app development.

Android Studio usually installs it automatically,

but you should ensure that it's up to date.

4. Bluetooth API: Android provides

Bluetooth API to develop Bluetooth-enabled

applications. Familiarize yourself with

Bluetooth API documentation provided by

Android.

5. Android Virtual Device (AVD) or

Physical Android Device: You can use either an

Android Virtual Device provided by Android

Studio or a physical Android device connected

to your development machine for testing your

application.

6. Text Editor or IDE: While Android

Studio is the primary tool for development,

having a good text editor or IDE for writing and

editing code can be helpful. Examples include

Visual Studio Code, IntelliJ IDEA, etc.

Software Setup:

1. Android Studio: Install Android Studio

on your development machine. Ensure that you

have the latest version installed, along with the

necessary SDK components and platform tools.

2. Java Development Kit (JDK): Make

sure you have the Java Development Kit (JDK)

installed on your development machine.

Android development primarily uses Java for

coding.

3. Android SDK: Android Studio usually

installs the Android SDK automatically.

However, ensure that the SDK is up to date and

contains the necessary tools, platform, and

system images.

Development Environment:

1. Project Setup: Create a new Android

project in Android Studio for developing the

Bluetooth chat application. Configure the

project settings, including package name,

minimum SDK version, and target SDK

version.

2. Bluetooth Permissions: Declare the

necessary Bluetooth permissions in the

AndroidManifest.xml file to enable Bluetooth

functionality in the application. Permissions

may include BLUETOOTH,

BLUETOOTH_ADMIN, and

ACCESS_FINE_LOCATION.

3. User Interface (UI): Design the user

interface for the chat application using XML

layout files in Android Studio. Create UI

elements such as text fields, buttons, message

bubbles, and chat lists to facilitate messaging

interactions.

4. Bluetooth Functionality: Implement

Bluetooth connectivity features using Java

code. Utilize Android's Bluetooth API to

discover nearby devices, establish Bluetooth

connections, and exchange messages between

devices.

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5. Message Handling: Develop logic for

encoding, transmitting, receiving, and

displaying messages within the chat

application. Implement message queues,

parsers, and UI adapters to handle message

interactions effectively.

6. Testing: Deploy the application to the

Android devices connected to your

development machine or use Android Virtual

Devices (AVDs) for testing. Conduct thorough

testing to ensure that the application functions

correctly under various scenarios, including

device pairing, message exchange, and error

conditions.

7. Debugging and Optimization: Use

Android Studio's debugging tools to identify

and fix any issues encountered during testing.

Optimize the application for performance,

battery efficiency, and compatibility with

different Android device configurations.

External Hardware Setup (Optional):

1. Bluetooth-enabled Devices: If testing

communication with external hardware, ensure

that the devices are powered on and

discoverable. Pair the devices with your

Android devices through Bluetooth settings.

2. Arduino or Other Devices: Connect the

Bluetooth modules to your external hardware

(e.g., Arduino) and program them to

communicate with the Android application

using Bluetooth protocols. Test communication

between the Android devices and the external

hardware.

Result:

Setup Bluetooth Permissions: In your

AndroidManifest.xml file, you need to add

permissions for Bluetooth communication.

These permissions include <uses-permission

android:name="android.permission.BLUETO

OTH"/> and <uses-permission

android:name="android.permission.BLUETO

OTH_ADMIN"/>.

Design UI: Design the layout for your chat

interface in Android Studio. You'll need text

fields for displaying messages, an input field for

typing messages, and buttons for sending

messages and managing Bluetooth connections.

Implement Bluetooth Connectivity: Use the

Android Bluetooth API to discover nearby

Bluetooth devices, establish connections, and

manage data transfer. This involves using

classes like BluetoothAdapter,

BluetoothDevice, BluetoothSocket, etc. You'll

need to handle Bluetooth permissions and

runtime permissions if your app targets Android

6.0 (API level 23) or higher.

Create Chat Logic: Implement the logic for

sending and receiving messages over

Bluetooth. This includes encoding messages,

handling message sending and receiving

events, and updating the UI accordingly.

Handle Device Discovery: Implement device

discovery functionality to find nearby

Bluetooth devices that can be connected to for

chatting.

Handle Connection Events: Manage the

connection lifecycle, including connecting to

devices, handling connection failures, and

disconnecting from devices.

Test and Debug: Test your application on real

devices and emulators to ensure it works as

expected. Debug any issues that arise during

testing.

Output:

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International Journal of Novel Research and Development (www.ijnrd.org)

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Conclusion:

By setting up the experimental environment as

outlined above, you can effectively develop,

test, and validate the Bluetooth chat application

using Java and Android Studio. Ensure

thorough testing across different devices and

scenarios to verify the functionality, reliability,

and performance of the application before

deployment.

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