27 September, 2021

Building a Chat App for Android from Scratch – Complete Guide 2021

Are you planning to build your messaging chat app? Getting amazed with its thought!

But still wondering to proceed further!

Chill! This blog is your blueprint – I will walk you through an end-to-end technical part to build your Android messaging chat application alongside building your confidence as well.

Before diving deep into the core, let’s have some insight about the needs of messaging chat apps in the businesses.

Need to Build a Chat App : The Facts!

According to Facebook, WhatsApp is the leading messaging app, followed by around 1.3 billion users, and WeChat with over 1.2 billion users. Moreover, with this almost 80% of people use these messaging apps in their regular life. But, the fact is the modern businesses can not make use of these social media platforms for their business mainly due to security issues.

build chat app

Wholly, these criteria simply prove the need for chat APIs solutions in businesses. Moreover, the reliability, scalability, and security factors of these instant messaging applications have made businesses look upon them when it comes to the growth of a business by connecting in real time with customers.

These real time chat applications are recognized mostly for their unique and everlasting features

Utmost Basic Features in an Instant Chat App, You Must Know!

You can find several real time chat apps in the market with numerous features specifying their uniqueness. But still, there are some ground-level features that are common for all.

build chat app android

Here, Let’s have a look at some of these grounded features

  • One-to-One Private chat : Allows the user to get connected to another particular user in no time.

  • Group Chat : Permits to create private or public groups to have real time conversations with an unlimited number of people.

  • Video calling & Conferencing : Enables you to make peer-to-peer HD video calling on any platform. Also allows you to have a group or conference video calling with up to more than 5 users with a crystal clear quality.

  • Voice Calling : Allows you to make calls instantly and get connected to people across the world. Even with conference calling you can experience fine tuned quality while connecting with multiple users.

  • Video Call Recording : Enables to record every call, also compose the video to your likings with edits and store the recording effortlessly in cloud.

  • File Transfer : Enables to share multiple files of any type to any user privately or publicly.

  • Tabbed Messages : It allows you to alter any number of chats and combine multiple messages into a single window.

  • Animated GIFs : It makes the communication more interactive with just-a-click option of animated GIFs to turn the chat more engaging.

  • Real time Language Translation : You can have your conversations translated into any language within the chat screen.

  • Cross-platform Calling : Helps in making direct high-quality voice calls to a desktop, any platform or mobile app anytime, anywhere.

However, these are some but there are more to dig deep into when it comes to real time communication applications. But I think it’s not enough, it’s better to have some idea about its benefits over certainly picked enterprises too.

Are you interested in developing chat app for android?

What are the Benefits of Chat App Over Variety of Industries

The utilization of these chat applications is not restricted to some of the industries as they have spread their wings wider across. 

Let’s have a look at some of these industries

1. E-Commerce & Marketplace – This industry makes use of video conferencing applications and has a live chat with customers. With a live chat facility, it communicates with the customers to place the order and have a track of delivering the order. And with video conferencing, it avoids the inconvenience of long emails and waiting time from both ends. Moreover, resolve the issues in the first place itself

2. Banking and Finance – This industry also makes use of both chat as well as video conferencing applications. In the banking sector, the employees use this chat app to communicate and share confidential files with other employees. In the same way in the finance industry, with the help of live chat, they interact and have a track of the current stock market. They also interact with their investors via video conferencing with regard to financial history and current market revenues. The drop-off in the shares and other related areas can be viewed and discussed instantly

3. Digital Healthcare & Hospitals – In the healthcare industry, with live chat apps, the patient can communicate with the doctor and set an appointment, share medical diagnosis reports, etc. and in the further run can make use of this video application to perform operations by interacting with the other surgeons present at the other end of the world and save patients lives

4. Online Education Industry – The online education industry is all about live video conferencing where the student can communicate with the teacher and have a regular learning lesson. With the chat app, the students can share and submit their documents/papers with the teacher and have them corrected.

Now, when you have got a clear idea about its necessity in a variety of fields. You must be thinking as to whether you can build an app or go for some ready-made one.

Well, that’s a cool thought to think about, let’s have a check over!

Choice is Yours : Readymade vs Custom Chat App

If someone asks you, what to choose: a ready-made or custom solution? What could be your response? Of course, the first thing that strikes your mind would be what is special about each of them. Exactly! That’s what I am going to tell you now but in brief.

Ready-made solutions can also be indirectly considered as a White label Chat app as it is one of the basic features found in them. as the name suggests, they are the solutions that are available as an in-built one that you can purchase and integrate into your existing application.

The main drawback of these ready-made solutions is that you can only avail the benefits of the features that already exist. But, since it is available with the restriction it won’t provide you with the facility to add extra features in future. But, it does allow your solution to be hosted on our cloud as well as on your premises or cloud as per your business needs. 

Whereas in the case of custom solutions, there is a need to build one from scratch. It involves the following steps

<center>Build Custom Solution Steps</center>
  • Check for a platform – have a clear idea as what is your targeted platform Android or iOS?
  • Mission of your app – What and whom does your app target ? This is so as to have an idea about the features that need to be included in the application.
  • MVP (minimum viable product) – It talks about the need as how the MVP look like including the features.
  • Duration to develop an application – Before starting must be clear with the idea of finding a specialized developer – in-house or remotely. Of course, with a set of supporting teams to set the duration to build an application

The overall highlight of these custom chat apps is that in the future you can add any number of features as per your business requirements with no restrictions. As an outcome of the above, both sound to be great in their own means, but finally it’s all about your needs.

Let’s have a look at what are the things being needed when building your own real-time chat app with CONTUS MirrorFly – “One of the market’s leading in-app Chat APIs & SDKs provider”.

Time to Build an Chat App for Android with CONTUS MirrorFly

Well, when it comes to building a messaging chat, voice, and video solution, every chat app provider follows their own protocols. Moreoless, all of them would be checking out to give out something best.

This section is all about the involvement of CONTUS MirrorFly when it comes to building chat applications for Android, iOS and web apps.

But here, I am going to give you an understanding of creating team chat app for Android platform. The exciting part is that this solution can be integrated easily into your application. Moreover, when it comes to the client-side, you can have them initialized as well as configured as per your need with minimal effort.

how to create realtime chat application in android

On the other hand with regards to server-side, CONTUS MirrorFly focuses mainly on the reliability within the application.  It allows the space for all server setup-related documents to be downloaded from the control panels’ download section.

This later with initialization page gives the Chat SDK’s structure and installation procedure. Once everything is done, it moves across the preliminary steps of implementing the Chat SDK in your own project.


Let’s have a look at some of the minimal requirements for Chat SDK for Android
1) Android Lollipop 5.0 (API Level 21) or above
2) Java 7 or higher
3) Gradle 4.1.0 or higher

SDK License Key

As an initial process, it is essential to see that the SDK is authenticated by CONTUS MirrorFly server using License Key. In this, you can make use of the master License Key in your dashboard while generating an account. 
But, one thing that needs to be noticed is that the master API token can not be revoked or changed later.


To begin with, you need to check whether the SDK has already been compiled into an AAR file or not? This is so as to use the SDK, the below AAR file has to be imported into the project. However, the support of kotlin is needed for the chat SDK in the project to move ahead.

Step 1 : First have to download the latest SDK from CONTUS MirrorFly Control Panel Download’s section.
Step 2 : Extract the files from downloaded zip file.
Step 3 : Create a new Android project.

Step 4 : Add the file libraries in app/libs folder in the project,


Step 5 : Add the following dependencies in app/build.gradle file

implementation files('libs/appbase.aar')
implementation files('libs/flycommons.aar')
implementation files('libs/flynetwork.aar')
implementation files('libs/flydatabase.aar')
implementation files('libs/compression.aar')
implementation files('libs/xmpp.aar')

Step 6 : Add the below required dependencies by the SDK in app/build.gradle

//For lifecycle listener
implementation 'android.arch.lifecycle:extensions:1.1.1'
annotationProcessor 'android.arch.lifecycle:compiler:1.1.1'

//For GreenDao
implementation 'de.greenrobot:greendao:2.1.0'

//For gson parsing
implementation 'com.google.code.gson:gson:2.8.1'

//for smack implementation
implementation 'org.igniterealtime.smack:smack-android:4.2.4'
implementation 'org.igniterealtime.smack:smack-tcp:4.2.4'
implementation 'org.igniterealtime.smack:smack-im:4.2.4'
implementation 'org.igniterealtime.smack:smack-extensions:4.2.4'
implementation 'org.igniterealtime.smack:smack-sasl-provided:4.2.4'

implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'
implementation 'androidx.multidex:multidex:2.0.1'
implementation 'com.google.android.gms:play-services-location:17.0.0'

implementation 'com.facebook.stetho:stetho:1.3.1'
implementation 'com.hypertrack:hyperlog:0.0.10'

//for mobile number formatting
implementation 'io.michaelrocks:libphonenumber-android:8.9.14'

//Dagger Dependencies
api 'com.google.dagger:dagger:2.25.2'
kapt 'com.google.dagger:dagger-compiler:2.25.2'
api 'com.google.dagger:dagger-android:2.25.2'
api 'com.google.dagger:dagger-android-support:2.25.2'
kapt 'com.google.dagger:dagger-android-processor:2.25.2'

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.3'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.3'

implementation 'com.squareup.retrofit2:retrofit:2.6.1'
implementation 'com.squareup.retrofit2:converter-gson:2.6.1'
implementation 'com.squareup.okhttp3:okhttp:4.2.0'
implementation 'com.jakewharton.retrofit:retrofit2-kotlin-coroutines-adapter:0.9.2'

//stetho interceptor
implementation 'com.facebook.stetho:stetho-okhttp3:1.3.1'

//okhttp interceptor
implementation 'com.squareup.okhttp3:logging-interceptor:3.14.3'

Step 7 : Add the below code in the app-level build.gradle

plugins {
    id 'kotlin-android'
    id 'kotlin-kapt'

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8

    kotlinOptions {
        jvmTarget = '1.8'

    packagingOptions {
        exclude 'META-INF/AL2.0'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/ASL2.0'
        exclude 'META-INF/LGPL2.1'


Step 8 : Open the AndroidManifest.xml and add below permissions

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

These are the technical steps that are required to have the best chat app.
We are ready to make your chat app come true


Well, this article would have given you deep clarity over the technical terms when it comes to building your own chat application for Android.

But, let me tell you that CONTUS MirrorFly provides this fantastic application for iOS and web apps as well.

Thus, if in case you are interested to know further about creating a chat app with iOS or web application, then I am happy to say that I am on my way to get you the related technical blog very soon for them as well.

If you already have an idea about creating android chat app, Schedule a free demo and we’ll help you implement it!

Demo Button


If you want to make a chat application for android, then you are suppose to follow the below steps,
1) Perform a market research and make a note of competitors of your chat app in market
2) List the features and an appropriate platform that you want in your chat app
3) Plan the various modes in monetization strategy for your instant messaging app
4) Have a check on your app's MVP features
5) Choose a team of proficient developers and educate them about your app's idea
6) Prepare a marketing strategy before launching your chat app
7) Launch the app in the market and gradually perform a regular addition of features to stay in for long run
By following these checklists you can be assured to build the best chat application.

To build a custom video chat app for android, you have to follow the key points,
1) Hire an in-house team of skillful developers
2) Plan for the UI/UX design that should be minimalistic and intuitive to grab audience attention.
3) Choose the best backend development, the technical stack
4) Integrate the video streaming protocol as per the business requirement
5) Before market launch perform software testing on the product and fix the bugs
With these above key steps, you can be able to build your video chat application with ease

Parthiba is a Product Marketer, helping providers of the various industries like healthcare, education, etc., to elevate their conversation value with the help of powerful communication solutions to drive better communication experience.


  1. harris Reply

    I have an app developer making me a phone number caller app for Android like Text Now. We need buy your SDK for app to phone number calling

  2. james Reply

    I’m looking to use the mirror fly audio/video chat iOS sdk in an android, iOS application and wanted to get cost estimate. Thanks, James

  3. Arjay Reply

    I am creating a delivery app in android platfom, i want to include an ability to make voice call using through app to app.

  4. bodner Reply

    Looking to integrate chat api into our android platform so need to know pricing. hosting options and customization features

  5. pablo Reply

    I’m the CTO of a small startup developing an app to do deliveries with independent truck drivers. The mobile app ()iOS & Android) is built with React Native, the backend is in Ruby on Rails, and we have a web console for our dispatchers developed in React. We are currently in production but internal test only, we plan to launch to the public gradually starting at the end of this month. We would like to add a chat feature between each driver and the dispatchers, to avoid them using phone calls, Whatsapp or Messages. We plan to grow gradually from 0 to approx 500 registered drivers in 1 year, probably we won’t have more than 5 simultaneous drivers for a year at least. Is your solution a good fit for us? What would be the pricing? Thanks!

  6. andrew Reply

    Hello, We are just starting to build an app that could utilize this. We are building a call recording app for the iPhone. Basically the user makes a phone call just like normal, then calls another phone number that does the recording, and merges the two calls. I have no idea what your pricing is, or if we could afford it right now, but I thought I would reach out to ask. Can you please provide that? Do you think your software would be a good fit for my app. I’d rather not be called all the time, but will respond quickly over email. Thanks, Andrew.

  7. Ahmad Reply

    looking for chat app for android with following Requirements Description 1-1 relation: Partner can contact campaign manager specifically from mobile/web app 1-1 relation: The campaign manager can contact a particular partner directly 1-1 thread: If multiple Agents (campaign managers), reach out to the same end-user, the partner should have two separate conversations threads Embedded: Chat tool embedded within web/mobile app (if possible) Partner Login: As users log in to our app already, we need to utilize the same login for using the chat tool Agents Login: As agents log in to our specific web platform, we need to utilize the same login for using the chat tool Rich Media: Links, images, audio, call Chat history: History of chats to be maintained on both ends i.e. agent and partner Broadcasting: Be able to send messages to a bulk number of users from the platform (if possible)

  8. gerald Reply

    Hello, we are a startup looking for a very reliable real-time chat SDK for a marketplace implementation to connect users and sellers in real time. the solution should be very customisable and secure.

  9. Rohit Reply

    Hi We are building a video calling app with high usage that would include only peer to peer calling (no conferences), roughly with 25K users we are looking at 45 million minutes a month. Could you let me know the total cost per month please? Thanks Rohit

  10. Shohan Reply

    Sir, I want to make an android app which will be used for voice calling to mobile numbers or land line numbers using internet. Can you provide any APIs for that app

  11. Archid Reply

    Hi i am looking to embed one to one audio calling in my iOS and Android application. We are currently at 5000 active users and growing. I’d like to know the solutions and pricing that mirrorfly has to offer

  12. Prabhakar Reply

    We are looking for a customized video conferencing solution for my android app (They do not want to use zoom or any such platfoms due to security concerns It would be apreciated if you can arrange for a demo/call tomorrow 28th july 2021 at around 11:30 AM (IST) if it is viable for you

  13. Fabilola Reply

    Hi, I’m a android app developer and I’d like to watch a demo version on how we can integrate your chat api to our android app

  14. john Reply

    we are building a mobile app and need messaging and video chat with patients. Looking for third party providers to integrate into our product. Can you please call me or send details on the priciing?

    1. Masi Reply

      Hello John, Thanks for considering our chat api for your messaging and video chat app for doctor-patient communication. Brief about our chat app solution, it is with HIPAA compliance along with over 150 + chat features of voice, video and chat altogether that can be easily integrated into any device like iOS, Android, and web app. You can drop your detail so that our support team can set an appointment to proceed further. Thank You!

  15. Sandipan Reply

    We are a product based company.We are having a website build in php(laravel) platform. question 1: So, is your application can be embedded into our website? question 2: can we manage(view, edit ) chats from our end admin panel?

    1. Masi Reply

      Hello Sandipan, Glad to connect with you. With regards to queries our android chat API are very much compatible to be embedded into any existing device like iOS, Android, and web app. And as soon as you purchase our chat solution, we provide you with a complete lifetime ownership, so that you can make any modification, further addition of custom features, into you application just with our easy guided documentation. Feel free to contat us to proceed further. Thank You!

  16. patsanan Reply

    My business is Telehealth for physical therapy treatment . I want to use features such as peer-peer video conference, can video call on website (support in android + iOS) without installing an app

    1. Masi Reply

      Hello Patsanan, Good to know about your business. Our chat API is capable to provide you with peer-to-peer video conference and related over 150+ chat features and more that can be easily integrated into any of your existing device such as iOS, Android, or web app. And if you still need clarity, feel free to contact us to proceed further. Thanks!

  17. Nicholas Reply

    Hello, currently we are developing our own internal chat app in andorid that specifically cater for health industry. We have experienced doing a full customization chat app on Pubnub (HIPPA compliance) and also Qiscus under React Native for few of our clients. We would like to ask few questions: 1. is this solution similar to Pubnub? 2. how does it compare? the SDK offered all the features that you mentioned on the website? 3. is this HIPPA Compliance solution? 4. it can be installed on-premise? 5. what’s the pricing package? 6. what’s the technology being used in mirrorfly? thanks!

    1. Masi Reply

      Hi Nicholas, Glad to know about your project and very much pleased as you have considered us for your current android chat app needs. With regards to your enquiry, to be frank we deal with all real time communication – voice, video, and chat APIs and SDKs. Our 100% customization and 150 + chat features with addition option of custom features engageing unlimitied users around the world has made us unique among our competitors. Yes! our android chat SDKs are capabale for more than you can expect of course with HIPAA compliance for healthcare communication apps. With hosting, we provide both on-premises as well as on-cloud or else if you have your cloud, we do allow that too as per our clients choice. Concerning technology, we work with client prefered technology, so what technology you prefer for your business we will get with building chat application with that. For further pricing related queries, feel free to contact us to set an appointment to proceed further. Thank You!

  18. Faisal Reply

    Hi, I am Shayan from Faisal’s team. We are working in Virtual Recruitment Technologies Ltd based in the United Kingdom. We want demo of your chat application. Can you please connect with me on skype tomorrow morning ASAP

    1. Masi Reply

      Hello Shayan, Glad to connect with you. Sure, our chat API is available as a demo version and you have to contact our sales team. Just feel free to drop your contact details to set an appointment to proceed further. Thank You!

  19. Jamie Reply

    Hello. I’d be interested in using your video call API in the mobile and web apps of my startup company. What will your pricing be as to permit me to have 1 on 1 HD Video calls (with voice) between users? Can users annotate/draw on the video stream? Thanks for your help, Jamie

    1. Masi Reply

      Hello Jamie, Glad to know about your build android video chat app. Our solution is available with one-to-one video and voice calling, video conferencing, live video streaming feature, and much more. In addition we also provide custom features as per business needs. So, feel free to contact us to have an appointment with pricing and related queries. Thank You!

  20. Urrutia Reply

    I want to enable group chat , personal chat 1-1 video calling in my android app, only that, can you provide pricing? I have about 1k concurrent users a day. looking for whitleable chat api with customized solution and one-time payment option also .thanks alot

    1. Masi Reply

      Hi Urrutia, you really sounds great. Yes, ofcourse ours is the whitelabel chat API with 100% customization option with high end of scalability allowing unlimited gobal users engagement. Regarding pricing, as you asked for its available at one time payment option with your desired features. So, feel free to contact us to set an appointment to proceed further. Thank You!

  21. Eaton Reply

    The business would need a serious amount of features. To start, how much would it cost to create an android chat app with all the features of WhatsApp plus Touch ID and video chat/conference calls.

    1. Masi Reply

      Hello Eaton, Your interest and planning of build android chat app with numerous combination sounds amazing. With regards to our chat API, you can be assured the fulfillment of all your feature need as we have more that 150+ chat features with easy customization process. With regards to pricing strategy feel free to contact us to set an appoinment to proceed further with clarity. Thank You!

  22. Vlad Suciu Reply

    Hi, Currently thinking to build a mobile app that will have the ability to make audio/video calls, can you provide me a list of prices? Interested in cost per minute per session for 1 to 1 audio/video call. Kind regards

  23. Thilanka Reply

    We are developing a Social media site for one of our client. They need to integrate Audio , video and messaging to their platform using an API. they will use web app, android & iOS app. what is the most cost effective pricing model for the requirement?

  24. Mohamed Reply

    Hello, I am looking for a solution for our realtime chat app which we have used Firebase as a backend. But this has limitations and I stumbled upon MirrorFly. Do you have an real time Chat SDKfor Untity3D / .NET 4 + Also, I couldn’t find any pricing or how the purchase works. Please reply back to me with some more info. Thanks, Arif

  25. chun Reply

    I need Chat API for the gaming app, Our company was established in March of this year as a development subsidiary of Commseed Inc. in Japan, and we are developing social games with the goal of launching in the first half of 2022. The service area will be 1st Japan and 2nd Global. At the beginning of the service, it will be anticipated that a large amount of MAU, due to large marketing. However, it is currently targeting 80,000 DAUs and 300,000 MAUs. As well as the actual solution will be examined after June. I am looking forward to your reply. Yours Sincerely.

    1. Masi Reply

      Hi Chun, My deep heartily congratulations on your newly established company. As we deal with all-in-one real-time communication API – voice, video and chat, we can get you the ever best gaming application. Our communication API solution is with end-to-end customization where you can have several features as per your business needs and in future once purchased if you ever wanted to upgrade it, you can easily. To have detailed knowledge about the entire solution feel free to contact us. Thank you!

  26. Kim Reply

    Hi there – I have a few questions about your Chat SDK and would like to set up a call to discuss your solution in more detail. Let me know when your team is available.

    1. Masi Reply

      Hello Kim, I am glad that you are interested in our chat SDK solution. Sure will have a discussion. Kindly, drop your details in our contact page, our representatives will contact you to set an appointment soon. Happy to hear from you. Thank you!

  27. Benjamin Reply

    I have two groups of users. Lets say its Students and Professors. I need the chat app to only allow Professors to start the chats, while students cannot initiate them, but can reply. Also the Professors should have lists available for each of the students related to the specific classes. They shouldn’t be able to send messages to students that don’t belong to any of their classes. Is this something that can be achieved?

    1. Masi Reply

      Hello Benjamin, Your thoughts are really appreciable. About our mirrorfly chat solution, it is very much flexible and our dedicated team of professional developers can help you with better exposure on your needs. I appreciate it if you can contact us and have your details to proceed further with the discussion. Thank you!

  28. Willem Reply

    we are looking for an economic solution to integrate in our system audio/video/chat api. Communication with Android from IOS & Android We are thinking to use Webrtc or jitsi but we want to know about Mirrorfly conditions. Please share your conditions.

    1. Masi Reply

      Hi Willem, thanks for showing interest in our video call solution. As you explained about your need, our solution does move along with any application of course that includes iOS, Android and web app. To have better clarity about our solution, I think it’s better to have a discussion with our team. Thus, feel free to drop your details so that we can set an appointment and share the conditions of our solution in detail. Thank you!

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