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How to Build a Flutter Video Call App

How to Build a Flutter Video Call App

Flutter is a versatile tool that enables developers to create applications with a wide range of functionalities. It is capable of developing applications that can run on multiple platforms seamlessly. As video calls become more and more popular since the covid-19, many developers are interested in making flutter call apps. No worry, keep going on! This tutorial shows us how to create a flutter video call application with ZEGOCLOUD SDK.

Why ZEGOCLOUD SDK for Building a Video Calling App

Choosing the right SDK is crucial for the success of a video calling app. In the context of Twilio and Agora Video SDK, ZEGOCLOUD SDK stands out for several compelling reasons, especially considering the discontinuation of Twilio’s Video SDK services.

  • End of Twilio Video SDK Services: With Twilio discontinuing its Video SDK, developers need a reliable and long-term solution. ZEGOCLOUD SDK offers stability and ongoing innovation, making it an attractive Twilio migration choice for future-proofing your app.
  • Feature Comparison with Agora: ZEGOCLOUD SDK boasts features essential for a modern video calling application: low-latency communication, high-definition video, and scalability for large-scale interactive live streaming, positioning it as a strong competitor to Agora Video SDK.
  • Platform Support: ZEGOCLOUD SDK provides extensive support across iOS, Android, Web, Flutter, React Native, and Unity, enabling broader audience reach without compromising quality across different devices and operating systems.
  • Scalability and Performance: Designed for growth, ZEGOCLOUD can handle a large number of users simultaneously, thanks to its global data centers. This scalability is crucial for apps targeting a wide user base.
  • Pricing Model: With a flexible and competitive pricing model, ZEGOCLOUD SDK is accessible for startups and enterprises alike, allowing businesses to scale without facing prohibitive costs.
  • Developer Support: ZEGOCLOUD emphasizes easy API integration and robust developer support, offering comprehensive documentation, an active community, and responsive support teams to resolve issues and implement features efficiently.

You may also like: ZEGOCLOUD vs Agora vs Twilio vs Vonage vs Zoom: In-Depth Comparison

ZEGOCLOUD UIKits – Build Faster & Ship More

ZEGOCLOUD UIKits is a collection of pre-designed user interface (UI) elements that can be used by developers to create visually appealing and intuitive applications with ease. It allows developers to build video communication applications with a seamless experience.

The UIKits come complete with a diverse range of design templates, including buttons, icons, frames, and other UI components, making it easier for developers to integrate video communication functionalities into their applications. These design templates can be used to create comprehensive UI designs for applications that are visually appealing and intuitive. It saves developers time and effort in designing UIs for their applications.

Through it, We can complete the development of video calls, live streaming, app chat and video conferences, and other scenarios within 10 minutes.

UIKits support many frameworks such as Flutter, react native, iOS, Android, and Web, which is very friendly for different developers to build their applications. If you are wondering how to build a video call app with Flutter, UIKits is the most recommended pre-built SDK to help you complete your app development easily and quickly.

As shown in the figure, Flutter UIKit SDK is responsible for processing audio and video calls and the logic related to text chat. Include:

  • UI and interaction of the calling module
  • Call status management
  • Audio and video data transmission

You only need to implement business-related logic. For example:

  • User login registration
  • Friends List Management
  • Call billing recharge
flutter callkit

How to Build a Video Calling App in Flutter


  • A ZEGOCLOUD developer account–Sign up
  • Flutter 1.12 or later.
  • Basic understanding of Flutter development

Implement video call

Create Project

Run the following code to create a new project.

flutter create --template app.
create project

Add ZegoUIKitPrebuiltCall as a dependency

Run the following code in your project root directory:

flutter pub add zego_uikit_prebuilt_call
add flutter callkit sdk

Add ZegoUIKitPrebuiltCall as dependency

Run the following code in your project root directory:

flutter pub add zego_uikit_prebuilt_call

Import the SDK

Now in your Dart code, import the prebuilt CallKit Flutter SDK.

import 'package:zego_uikit_prebuilt_call/zego_uikit_prebuilt_call.dart';
import flutter callkit sdk

Start Video Call

Use ZegoUIKitPrebuiltCall to build a Call page.

class CallPage extends StatelessWidget {
  const CallPage({Key? key, required this.callID}) : super(key: key);
  final String callID;

  Widget build(BuildContext context) {
    return ZegoUIKitPrebuiltCall(
      appID: yourAppID, // Fill in the appID that you get from ZEGOCLOUD Admin Console.
      appSign: yourAppSign, // Fill in the appSign that you get from ZEGOCLOUD Admin Console.
      userID: 'user_id',
      userName: 'user_name',
      callID: callID,
      // You can also use groupVideo/groupVoice/oneOnOneVoice to make more types of calls.
      config: ZegoUIKitPrebuiltCallConfig.oneOnOneVideoCall() 
        ..onOnlySelfInRoom = () => Navigator.of(context).pop(),

Now, you can make a call by navigating to this. CallPage.

implement video call

Add a call button

Add a Call button, and navigate to the CallPage.

import 'dart:math';
import 'package:flutter/material.dart';
import 'package:zego_uikit_prebuilt_call/zego_uikit_prebuilt_call.dart';

void main() {
  runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  Widget build(BuildContext context) {
    return MaterialApp(home: HomePage());

class HomePage extends StatelessWidget {
  final callIDTextCtrl = TextEditingController(text: "testCallID");

  HomePage({Key? key}) : super(key: key);

  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 10),
          child: Row(
            children: [
                child: TextFormField(
                  controller: callIDTextCtrl,
                      const InputDecoration(labelText: "start a call by id"),
                onPressed: () {
                    MaterialPageRoute(builder: (context) {
                      return CallPage(callID: callIDTextCtrl.text);
                child: const Text("call"),

Configure your project

  • Android:
  1. If your project is created with Flutter 2. x.x, you will need to open the your_project/android/app/build.gradle file, and modify the compileSdkVersion to 33.
compile sdk version
  1. Add app permissions.
    Open the file your_project/app/src/main/AndroidManifest.xml, and add the following code:
   <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
   <uses-permission android:name="android.permission.RECORD_AUDIO" />
   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
   <uses-permission android:name="android.permission.CAMERA" />
   <uses-permission android:name="android.permission.BLUETOOTH" />
   <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
   <uses-permission android:name="android.permission.READ_PHONE_STATE" />
   <uses-permission android:name="android.permission.WAKE_LOCK" />
permission android
  1. Prevent code obfuscation.

To prevent obfuscation of the SDK public class names, do the following:

a. In your project’s your_project > android > app folder, create a file with the following content as shown below:

-keep class **.zego.** { *; }

b. Add the following config code to the release part of the your_project/android/app/build.gradle file.

proguardFiles getDefaultProguardFile('proguard-android.txt'), ''

android class confusion
  • iOS:

To add permissions, open your_project/ios/Runner/Info.plist, and add the following code to the dict part:

<string>We require camera access to connect to a call</string>
<string>We require microphone access to connect to a call</string>
permission ios

Run a Demo


It’s way easier to make a video call now than it was five or ten years ago. Additionally, their recent popularity also makes a point. In today’s market, a simple and secure video call app will definitely find its audience.

You can download the sample demo source code of this article to learn how to. If you have deeper requirements, such as streaming mix, noise reduction, censorship, etc. you can use our Core SDK. ZEGOCLOUD has the full customized video call SDK to meet what you want.

If you have any questions, you can always consult us at 24 hours for technical support.

Read more:

Flutter Video Call FAQ

Q1: How do I handle permissions for video calling in a Flutter app?

To handle permissions for video calling, especially for camera and microphone access, you can use the permission_handler package. It’s essential to request and confirm these permissions at runtime, particularly on iOS and Android, to ensure the app functions properly and respects user privacy.

Q2: Can Flutter handle group video calls or only one-on-one video calls?

Flutter can handle both one-on-one and group video calls. The capability largely depends on the backend service you choose (like Agora, Twilio, or ConnectyCube) and how you configure the video streaming and connection management in your Flutter app.

Q3: Are there any specific UI/UX design considerations when building a video call app with Flutter?

Several UI/UX design considerations should be noted:

  • Ensure buttons and controls are easily accessible during the call, considering both portrait and landscape modes.
  • Provide visual feedback for user actions, like muting/unmuting the mic or switching cameras.
  • Consider using overlays or minimizing the video feed window to allow multitasking within the app.
  • Keep the interface clean and minimal to avoid distracting from the main functionality of the video call.
  • Always test your UI on multiple devices to ensure a consistent and user-friendly experience across all screen sizes.

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