Chat Salon (Flutter)

Last updated: 2021-04-23 12:07:33



    This project does not support Flutter 2.0 for the time being. If you are using Flutter 2.0, please downgrade it first.

    You can download and install the demo we provide to try out TRTC features in the chat salon scenario, including audio chat, mic on/off, low-latency audio interaction, etc.

    To quickly enable the chat salon feature, you can modify the demo we provide and adapt it to your needs. You may also use the TRTCChatSalon component and customize your own UI.

    Using Demo UI

    Step 1. Create an application

    1. Log in to the TRTC console and select Development Assistance > Demo Quick Run.
    2. Enter an application name such as TestChatSalon and click Create.


    This feature uses two basic PaaS services of Tencent Cloud, namely, TRTC and IM. When you activate TRTC, IM will be activated automatically. IM is a value-added service. See Value-added Service Pricing for its billing details.

    Step 2. Download the SDK and demo source code

    1. Download the SDK and demo source code for your platform.
    2. Click Next.

    Step 3. Configure demo project files

    1. In the Modify Configuration step, select the platform in line with the source package downloaded.
    2. Find and open the /example/lib/debug/GenerateTestUserSig.dart file.
    3. Set parameters in GenerateTestUserSig.dart as follows:
      • SDKAPPID: `PLACEHOLDER` by default. Set it to the actual `SDKAppID`.
      • SECRETKEY: `PLACEHOLDER` by default. Set it to the actual key.
    4. Click Next to complete the creation.
    5. After compilation, click Return to Overview Page.


    • The method for generating UserSig described in this document involves configuring SECRETKEY in client code. In this method, SECRETKEY may be easily decompiled and reversed, and if your key is leaked, attackers can steal your Tencent Cloud traffic. Therefore, this method is only suitable for the local execution and debugging of the demo.
    • The correct UserSig distribution method is to integrate the calculation code of UserSig into your server and provide an application-oriented API. When UserSig is needed, your application can send a request to the business server for a dynamic UserSig. For more information, please see How do I calculate UserSig on the server?.

    Step 4. Compile and run


    An Android project must be run on a real device rather than a simulator.

    1. Run flutter pub get.
    2. Compile, run, and debug the project.


      1. Run flutter run.
      2. Use Android Studio (3.5 or above) to open the demo and run the project.


      3. Open \ios project in the source code directory with Xcode (11.0 or above).
      4. Compile and run the demo project.

    Step 5. Modify the demo source code

    The trtcchatsalondemo folder in the source code contains two subfolders: ui and model. The ui subfolder contains the UI code. The table below lists some of the files or folders and the UI views they represent. You can use it for reference when making UI changes.

    File or Folder Description
    base Basic classes used by the UI
    list List view and room creation view
    room Main room views for speakers and listeners
    widget Common control

    Customizing UI

    The trtcchatsalondemo folder in the source code contains two subfolders: ui and model. The model subfolder contains the reusable open-source component TRTCChatSalon. You can find the component's APIs in TRTCChatSalon.dart and use them to customize your own UI.

    Step 1. Integrate SDKs

    The chat salon component trtcchatsalondemo depends on the TRTC SDK and IM SDK. You can configure pubspec.yaml to download updates automatically.

    Add the following dependencies to pubspec.yaml of your project.

      tencent_trtc_cloud: latest version number
      tencent_im_sdk_plugin: latest version number

    Step 2. Configure permission requests and obfuscation rules


    Add requests for camera and mic permissions in Info.plist:

    <string>Audio calls are possible only with mic permission.</string>


    1. Open /android/app/src/main/AndroidManifest.xml.
    2. Add xmlns:tools="" to "manifest".
    3. Add tools:replace="android:label" to "application".


      Without the above steps, the "Android Manifest merge failed" error will occur and the compilation will fail.

    Step 3. Import the TRTCChatSalon component

    Copy all the files in the following directory to your project:


    Step 4. Create an instance and log in

    1. Call the sharedInstance API to create an instance of the TRTCChatSalon component.
    2. Call the registerListener function to register event callbacks of the component.
    3. Call the login function to log in to the component. Set the key parameters as described below.
      Parameter Description
      sdkAppId You can view the `SDKAppID` of your application in the TRTC console.
      userId ID of the current user, which is a string that can contain letters (a-z and A-Z), digits (0-9), hyphens (-), and underscores (_).
      userSig Tencent Cloud's proprietary security signature. To get one, please see UserSig.
    TRTCChatSalon trtcVoiceRoom = await TRTCChatSalon.sharedInstance();
    ActionCallback resValue = await trtcVoiceRoom.login(
    if (resValue.code == 0) {
        // Logged in

    Step 5. Create a room and become a speaker

    1. After performing step 4 to log in, call setSelfProfile to set your nickname and profile photo.
    2. Call createRoom to create a chat salon, passing in room-related parameters such as room ID and room name.
    3. You will receive a TRTCChatSalonDelegate.onAnchorEnterSeat notification that someone becomes a speaker, and mic capturing will be enabled automatically.

    // 1. Set your nickname and profile photo
    trtcVoiceRoom.setSelfProfile("my_name", "my_face_url", null);
    // 2. Call `createRoom` to create a room
    ActionCallback resp = await trtcVoiceRoom.createRoom(
        coverUrl: 'Room cover URL',
        roomName: 'Room name',
    if (resp.code == 0) {
       // Became a speaker
    // 4. You receive a `TRTCChatSalonDelegate.onAudienceEnter` notification after becoming a speaker
    onVoiceListener(type, param) async {
        switch (type) {
            case TRTCChatSalonDelegate.onAudienceEnter:
                // A listener enters the room

    Step 6. Enter a room as a listener

    1. After performing step 4 to log in, you can call setSelfProfile to set your nickname and profile photo.
    2. Get the latest chat salon room list from the backend.


      The chat salon list in the demo is for demonstration only. The business logic of the chat salon list varies significantly. Tencent Cloud does not provide list management services for the time being. Please manage the list by yourself.

    3. Call getRoomList to get short descriptions of the rooms, which are provided by room owners when they call createRoom to create the rooms.


      If your chat salon list already contains enough room information, you can skip the step of calling getRoomList. Just pass in the room ID to enter.

    4. After room entry, you will receive TRTCChatSalonDelegate.onAudienceEnter and TRTCChatSalonDelegate.onAudienceExit notifications about listeners’ room entry/exit from the component. Display the changes on the UI afterwards.
    5. You will also receive TRTCChatSalonDelegate.onAnchorEnterMic and TRTCChatSalonDelegate.onAnchorLeaveMic notifications about speaker list change.

    // 1. Set your nickname and profile photo
    trtcVoiceRoom.setSelfProfile("my_name", "my_face_url");
    // 2. Get the room list from the backend. Suppose it is `roomList`
    List<Integer> roomList = GetRoomList();
    // 3. Call `getRoomInfoList` to get the details of the rooms
    RoomInfoCallback resp = await trtcVoiceRoom.getRoomInfoList(roomList);
    if (resp.code == 0) {
        // Refresh the room list on your UI
    // 4. Pass in `roomId` to enter the room
    ActionCallback enterRoomResp =
              await trtcVoiceRoom.enterRoom(_currentRoomId);
    if (enterRoomResp.code == 0) {
        // Entered room
    // 5. After successful room entry, you receive a handling notification
    onVoiceListener(type, param) async {
        switch (type) {
          case TRTCChatSalonDelegate.onAudienceEnter:
                // A listener enters the room
          case TRTCChatSalonDelegate.onAudienceExit:
                // A listener exits the room
          case TRTCChatSalonDelegate.onAnchorLeaveMic:
              // A speaker exits the room
          case TRTCChatSalonDelegate.onAnchorEnterMic:
              // A speaker enters the room

    Step 7. Mic on/off

    Room owner

    1. A room owner can call leaveMic to become a listener. All users in the room will receive an onAnchorLeaveMic notification.
    2. A room owner can remove a speaker by passing in the speaker’s userId in kickMic. All users in the room will receive an onAnchorLeaveMic notification.

    // 1. Become a listener
    //2. Remove a speaker


    1. A listener can become a speaker by calling enterMic. All members in the room will receive an onAnchorEnterMic notification.
    2. A speaker can become a listener by calling leaveMic. All members in the room will receive an onAnchorLeaveMic notification.

    // 1. Become a speaker
    // 2. Become a listener

    Step 8. Use signaling to send messages about hand raising

    If you want listeners and room owners to obtain each other’s consent before performing the above actions in your app, you can use signaling for invitation sending.

    Listener requesting to speak

    1. The listener calls raiseHand to request to speak.
    2. The room owner receives an onRaiseHand notification, and a window pops up on the UI asking the room owner whether to approve the request.
    3. The room owner approves the request and calls agreeToSpeak, with the userId passed in.
    4. The listener receives an onAgreeToSpeak notification and calls enterMic to become a speaker.

    // Listener
    // 1. Call `sendInvitation` to request to speak
    // 2. Become a speaker upon receiving approval from the room owner
    onVoiceListener(type, param) async {
        switch (type) {
          case TRTCChatSalonDelegate.onRaiseHand:
    // Room owner
    // 1. Receive the request
    onVoiceListener(type, param) async {
        switch (type) {
          case TRTCChatSalonDelegate.onAgreeToSpeak:

    Step 9. Enable text chat and on-screen comments

    Call sendRoomTextMsg to send common text messages. All users in the room will receive an onRecvRoomTextMsg callback.
    IM has its default content filtering rules. Text messages that contain restricted terms will not be forwarded by the cloud.

    // Sender: send text messages
    trtcVoiceRoom.sendRoomTextMsg("Hello Word!");
    // Recipient: listen for text messages
    onVoiceListener(type, param) async {
      switch (type) {
        case TRTCChatSalonDelegate.onRecvRoomTextMsg:
              // Group text messages are received. This feature can be used to enable text chat rooms.