Upload Avatar for a User in SUSI.AI Server

In this blog post, we are going to discuss on how the feature to upload the avatar for a user was implemented on the SUSI.AI Server. The API endpoint by which a user can upload his/her avatar image is https://api.susi.ai/aaa/uploadAvatar.json.

  • The endpoint is of POST type.
  • It accepts two request parameters –
  • image – It contains the entire image file sent from the client
  • access_token – It is the access_token for the user

The minimalUserRole is set to USER for this API, as only logged-in users can use this API.

Going through the API development

  • The image and access_token parameters are first extracted via the req object, that is passed to the main function. The  parameters are then stored in variables.
  • There is a check if the access_token and image exists. It it doesn’t, an error is thrown.
  • This code snippet discusses the above two points –

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    Part imagePart = req.getPart("image");
    if (req.getParameter("access_token") != null) {
        if (imagePart == null) {
            result.put("accepted", false);
            result.put("message", "Image file not received");
        } else {.
        result.put("message","Access token are not given");


  • Then the input stream is extracted from the imagePart and stored. And post that the identity is checked if it is valid.
  • The input stream is converted into the Image type using the ImageIO.read method.
  • The image is eventually converted into a BufferedImage using a function, described below.

public static BufferedImage toBufferedImage(Image img)
    if (img instanceof BufferedImage)
        return (BufferedImage) img;

    // Create a buffered image with transparency
    BufferedImage bimage = new BufferedImage(img.getWidth(null),     
    img.getHeight(null), BufferedImage.TYPE_INT_ARGB);
    // Draw the image on to the buffered image
    Graphics2D bGr = bimage.createGraphics();
    bGr.drawImage(img, 0, 0, null);
    // Return the buffered image
    return bimage;


  • After that, the file path and name is set. The avatar for each user is stored in the /data/avatar_uploads/<uuid of the user>.jpg.
  • The avatar is written to the path using the ImageIO.write function. Once, the file is stored on the server, the success response is sent and the client side receives it.


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Displaying Avatar Image of Users using Gravatar on SUSI.AI

This blog discusses how the avatar of the user has been shown at different places in the UI like the app bar, feedback comments, etc using the Gravatar service on SUSI.AI. A Gravatar is a Globally Recognized Avatar. Your Gravatar is an image that follows you from site to site appearing beside your name when you do things like comment or post on a blog. So, the Gravatar service has been integrated in SUSI.AI, so that it helps identify the user via the avatar too.

Going through the implementation

  • The aim is to get an avatar of the user from the email id. For that purpose, Gravatar exposes a publicly available avatar of the user, which can be accessed via the following steps :
    • Creating the Hash of the email
    • Sending the image request
  • For creating the MD5 hash of the email, use the npm library md5. The function takes a string as input and returns the hash of the string.
  • Now, a URL is generated using this hash.
  • The URL format is https://www.gravatar.com/avatar/HASH, where ‘HASH’ is the hash of the email of the user. In case, the hash is invalid, Gravatar returns a default avatar image.
  • Also, append ‘.jpg’ to the URL to maintain image format consistency on the website. When, the generated URL is used in an <img> tag, it behaves like an image and an avatar is returned when the URL is requested by the browser.
  • It has been displayed on various instances in the UI like app bar , feedback comments section, etc. The implementation in the feedback section has been discussed below.
  • The CircleImage component has been used for displaying the avatar, which takes name as a required property and src as the link of the image, if present. Following function returns props to the CircleImage component.

import md5 from 'md5';
import { urls } from './';

// urls.GRAVATAR_URL = ‘https://www.gravatar.com/avatar’;

let getAvatarProps = emailId => {
  const emailHash = md5(emailId);
  const GRAVATAR_IMAGE_URL = `${urls.GRAVATAR_URL}/${emailHash}.jpg`;
  const avatarProps = {
    name: emailId.toUpperCase(),
  return avatarProps;

export default getAvatarProps;


  • Then pass the returned props on the CircleImage component and set it as the leftAvatar property of the feedback comments ListItem. Following is the snippet –

  leftAvatar={<CircleImage {...avatarProps} size="40" />}
        data.email.indexOf('@') + 1,
      <div className="feedback-timestamp">


  • This displays the avatar of the user on the UI. The UI changes have been shown below :


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Overriding the Basic File Attributes while Skill Creation/Editing on Server

In this blog post, we are going to understand the method for overriding basic file attributes while Skill creation/editing on SUSI Server. The need for this arose, when the creationTime for the Skill file that is stored on the server gets changed when the skill was edited.

Need for the implementation

As briefly explained above, the creationTime for the Skill file that is stored on the server gets changed when the skill is edited. Also, the need to override the lastModifiedTime was done, so that the Skills based on metrics gives correct results. Currently, we have two metrics for the SUSI Skills – Recently updated skills and Newest Skills. The former is determined by the lastModifiedTime and the later is determined by the creationTime. Due, to inconsistencies of these attributes, the skills that were shown were out of order. The lastModifiedTime was overridden to save the epoch date during Skill creation, so that the newly created skills don’t show up on the Recently Updated Skills section, whereas the creationTime was overridden to maintain the correct the time.

Going through the implementation

Let us first have a look on how the creationTime was overridden in the ModifySkillService.java file.

BasicFileAttributes attr = null;
Path p = Paths.get(skill.getPath());
try {
    attr = Files.readAttributes(p, BasicFileAttributes.class);
} catch (IOException e) {
FileTime skillCreationTime = null;
if( attr != null ) {
    skillCreationTime = attr.creationTime();

if (model_name.equals(modified_model_name) &&
    group_name.equals(modified_group_name) &&
    language_name.equals(modified_language_name) &&
    skill_name.equals(modified_skill_name)) {
    // Writing to File
    try (FileWriter file = new FileWriter(skill)) {
        json.put("message", "Skill updated");
        json.put("accepted", true);

    } catch (IOException e) {
        json.put("message", "error: " + e.getMessage());
    // Keep the creation time same as previous
    if(attr!=null) {
        try {
            Files.setAttribute(p, "creationTime", skillCreationTime);
        } catch (IOException e) {
            System.err.println("Cannot persist the creation time. " + e);


  • Firstly, we get the BasicFileAttributes of the Skill file and store it in the attr variable.
  • Next, we initialise the variable skillCreationTime of type FileTime to null and set the value to the existing creationTime.
  • The new Skill file is saved on the path using the FileWriter instance, which changes the creationTime, lastModifiedTime to the time of editing of the skill.
  • The above behaviour is not desired and hence, we want to override the creationTIme with the FileTime saved in skillCreationTIme. This ensures that the creation time of the skill is persisted, even after editing the skill.
  • Now we are going to see how the lastModifiedTime was overridden in the CreateSkillService.java file.

Path newPath = Paths.get(path);
// Override modified date to an older date so that the recently updated metrics works fine
// Set is to the epoch time
try {
  Files.setAttribute(newPath, "lastModifiedTime", FileTime.fromMillis(0));
} catch (IOException e) {
  System.err.println("Cannot override the modified time. " + e);


  • For this, we get the newPath of the Skill file and then the lastModifiedTime for the Skill File is explicitly set to a particular time.
  • We set it to FileTime.fromMillis(0) i.e, the epoch time.

I hope that I was able to convey my learnings and implementation of the code properly and it proved to be helpful for your understanding.


Documentation for BasicFileAttributes Interface – https://docs.oracle.com/javase/8/docs/api/java/nio/file/attribute/BasicFileAttributes.html

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Change Role of User in SUSI.AI Admin section

In this blog post, we are going to implement the functionality to change role of an user from the Admin section of Skills CMS Web-app. The SUSI Server has multiple user role levels with different access levels and functions. We will see how to facilitate the change in roles.

The UI interacts with the back-end server via the following API –

  • Endpoint URL –  https://api.susi.ai/cms/getSkillFeedback.json
  • The minimal user role for hitting the API is ADMIN
  • It takes 4 parameters –
    • user – The email of the user.
    • role – The new role of the user. It can take only selected values that are accepted by the server and whose roles have been defined by the server. They are – USER, REVIEWER, OPERATOR, ADMIN, SUPERADMIN.
    • access_token –  The access token of the user who is making the request

Implementation on the CMS Admin

  • Firstly, a dialog box containing a drop-down was added in the Admin section which contains a list of possible User roles. The dialog box is shown when Edit is clicked, present in each row of the User table.
  • The UI of the dialog box is as follows –

  • The implementation of the UI is done as follows –

  title="Change User Role"
  actions={actions} // Contains 2 buttons for Change and Cancel
    Select new User Role for
    <span style={{ fontWeight: 'bold', marginLeft: '5px' }}>
        Add Menu Items


  • In the above UI immplementation the Material-UI compoenents namely Dialog, DropDownMenu, MenuItems, FlatButton is used.
  • When the Drop down value is changed the handleUserRoleChange function is executed. The function changes the value of the state variables and the definition is as follows –
handleUserRoleChange = (event, index, value) => {
      userRole: value,


  • Once, the correct user role to be changed has been selected, the on click handlers for the action button comes into picture.
  • The handler for clicking the Cancel button simply closes the dialog box, whereas the handler for the Change button, makes an API call that changes the user role on the Server.
  • The click handlers for both the buttons is as follows –

// Handler for ‘Change’ button
onChange = () => {
  let url =
  let self = this;
    url: url,
    dataType: 'jsonp',
    crossDomain: true,
    timeout: 3000,
    async: false,
    success: function(response) {
      self.setState({ changeRoleDialog: true });
    error: function(errorThrown) {

// Handler for ‘Cancel’ button
handleClose = () => {
    showEditDialog: false,
  • In the first function above, the URL endpoint is hit, and on success the Success Dialog is shown and the previous dialog is hidden.
  • In the second function above, only the Dialog box is hidden.
  • The cross domain in the AJAX call is kept as true to enable API usage from multiple domain names and the data type set as jsonp also deals with the same issue.


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Adding Support for Playing Youtube Videos in SUSI iOS App

SUSI supports very exciting features in chat screen, from simple answer type to complex map, RSS, table etc type responses. Even user can ask SUSI for the image of anything and SUSI response with the image in the chat screen. What if we can play the youtube video from SUSI, we ask SUSI for playing videos and it can play youtube videos, isn’t it be exciting? Yes, SUSI can play youtube videos too. All the SUSI clients (iOS, Android, and Web) support playing youtube videos in chat.

Google provides a Youtube iFrame Player API that can be used to play videos inside the app only instead of passing an intent and playing the videos in the youtube app. iFrame API provide support for playing youtube videos in iOS applications.

In this post, we will see how playing youtube video features implemented in SUSI iOS.

Getting response from server side –

When we ask SUSI for playing any video, in response, we get youtube Video ID in video_play action type. SUSI iOS make use of Video ID to play youtube video. In response below, you can see that we are getting answer action type and in the expression of answer action type, we get the title of the video.

type: "answer",
expression: "Playing Kygo - Firestone (Official Video) ft. Conrad Sewell"
identifier: "9Sc-ir2UwGU",
identifier_type: "youtube",
type: "video_play"

Integrating youtube player in the app –

We have a VideoPlayerView that handle all the iFrame API methods and player events with help of YTPlayer HTML file.

When SUSI respond with video_play action, the first step is to register the YouTubePlayerCell and present the cell in collectionView of chat screen.

Registering the Cell –

register(_:forCellWithReuseIdentifier:) method registers a class for use in creating new collection view cells.

collectionView?.register(YouTubePlayerCell.self, forCellWithReuseIdentifier: ControllerConstants.youtubePlayerCell)


Presenting the YouTubePlayerCell –

Here we are presenting the cell in chat screen using cellForItemAt method of UICollectionView.

if message.actionType == ActionType.video_play.rawValue {
if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ControllerConstants.youtubePlayerCell, for: indexPath) as? YouTubePlayerCell {
cell.message = message
cell.delegate = self
return cell


Setting size for cell –

Using sizeForItemAt method of UICollectionView to set the size.

if message.actionType == ActionType.video_play.rawValue {
return CGSize(width: view.frame.width, height: 158)

In YouTubePlayerCell, we are displaying the thumbnail of youtube video using UIImageView. Following method is using to get the thumbnail of particular video by using Video ID –

  1. Getting thumbnail image from URL
  2. Setting image to imageView
func downloadThumbnail() {
if let videoID = message?.videoData?.identifier {
let thumbnailURLString = "https://img.youtube.com/vi/\(videoID)/default.jpg"
let thumbnailURL = URL(string: thumbnailURLString)
thumbnailView.kf.setImage(with: thumbnailURL, placeholder: ControllerConstants.Images.placeholder, options: nil, progressBlock: nil, completionHandler: nil)

We are adding a play button in the center of thumbnail view so that when the user clicks play button, we can present player.

On clicking the Play button, we are presenting the PlayerViewController, which hold all the player setups, by overFullScreen type of modalPresentationStyle.

@objc func playVideo() {
if let videoID = message?.videoData?.identifier {
let playerVC = PlayerViewController(videoID: videoID)
playerVC.modalPresentationStyle = .overFullScreen
delegate?.loadNewScreen(controller: playerVC)

The methods above present the youtube player with giving Video ID. We are using YouTubePlayerDelegate method to autoplay the video.

func playerReady(_ videoPlayer: YouTubePlayerView) {

The player can be dismissed by tapping on the light black background.

Final Output –

Resources –

  1. Youtube iOS Player API
  2. SUSI API Sample Response for Playing Video
  3. SUSI iOS Link
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Correct the API for Downloading GitHub Content in SUSI.AI android app

The content from github in the SUSI.AI android app is downloaded through simple links and the data is parsed through them and is used in the app depending upon what needs to be done with that data at that time.

A simple example for this that was used in the app was  :

private val imageLink = “https://raw.githubusercontent.com/fossasia/susi_skill_data/master/models/general/”

Above is the link that is used to download and display the images of the skills in the app. All the api calls that generally take place in SUSI are through the SUSI server, and making the call to display the images for the skills which takes place through the github links should be replaced by making the calls to the SUSI server instead, as this is a terrible programming style, with this style the project cannot be cloned from other developers and it cannot be moved to other repositories.

We see that there was a huge programming style issue present in the android app and hence, it was fixed by adding the API that calls the SUSI server for external source images and removing the existing implementation that downloads the image from github directly.

Below is an example of the link to the API call made in the app that was needed for the request to be made to the SUSI server :


The link is displayed in the kotlin string interpolation manner, here is what the actual URL would look like :


Here the values with ‘$’ symbol are the parameters for the API taken from the SkillData.kt file and are put inside the link so that the image needed can be extracted.

Now, since we use this link to set the images, to avoid the duplicate code, an Object class was made for this purpose. The object class contained two functions, one for setting the image and one for parsing the skilldata object and forming a URL out of it. Here is the code for the object class :

object Utils {

  fun setSkillsImage(skillData: SkillData, imageView: ImageView) {

  fun getImageLink(skillData: SkillData): String {
      val link = “${BaseUrl.SUSI_DEFAULT_BASE_URL}/cms/getImage.png?model=${skillData.model}&language=${skillData.language}&group=${skillData.group}&image=${skillData.image}”
              .replace(” “,“%20”)
      Timber.d(“SUSI URI” + link)
      return link

setSkillsImage() method sets the image in the ImageView and the getImageLink() method returns the image formed out of the SkillData object.



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Building SUSI.AI Android App with FDroid

Fdroid is an app store for Free and Open Source Software (FOSS). Building and hosting an app on Fdroid is not an easy process compared to when we host one on Google Play. A certain set of build checks are required to be done prior to making a merge request (which is similar to a pull request in GitHub) in the fdroid-data GitLab repository. SUSI.AI Android app has undergone through all these checks and tests and is now ready for the merge request to be made.

Setting up the fdroid-server and fdroid-data repositories is a separate thing and is fairly easy. Building the app using the tools provided by fdroid is another thing and is the one that causes the most problems. It will involve quite a few steps to get started. Fdroid requires all the apps need to be built using:

$ fdroid build -v -l ai.susi

This will output a set of logs which tell us what went wrong in the builds. The usual one in a first time app is obviously the build is not taking place at all. The reason is our metadata file needs to be changed to initiate a build.

The metadata file is used for the build process and contains all the information about the app. The metadata file for a.susi package was a .yaml file.


 – versionName: 1.0.10

   versionCode: 11

   commit: 1ad2fd0e858b1256617e652c6c8ce1b8372473e6

   subdir: app


     – fdroid

This is the metadata reference file’s build section that is used for the build process using the command that was mentioned above.The versionName a nd versionCode is found in the build.gradle file in the app and commit denotes the commit-id of the latest commit that will be checked out and built, subdir shows the subdirectory of the app, here the subdirectory is the app file.

Next is the interesting stuff, since we are using flavors in the app, we have to mention in the gradle the flavor which we are using, in our case we are using the flavor by the name of “fdroid” and by mentioning this we can build only the “fdroid” flavor in the app.

Also when building the app there were many blockers that were faced, the reason for the usual build fails were :

1 actionable task: 1 executed
INFO: Scanning source for common problems…
ERROR: Found usual suspect ‘youtube.*android.*player.*api’ at app/libs/YouTubeAndroidPlayerApi.jar
WARNING: Found JAR file at app/libs/YouTubeAndroidPlayerApi.jar
WARNING: Found possible binary at app/src/main/assets/snowboy/alexa_02092017.umdl
WARNING: Found possible binary at app/src/main/assets/snowboy/common.res
ERROR: Found shared library at app/src/main/jniLibs/arm64-v8a/libsnowboy-detect-android.so
ERROR: Found shared library at app/src/main/jniLibs/armeabi-v7a/libsnowboy-detect-android.so
INFO: Removing gradle-wrapper.jar at gradle/wrapper/gradle-wrapper.jar
ERROR: Could not build app ai.susi: Can‘t build due to 3 errors while scanning
INFO: Finished
INFO: 1 build failed

The reason for these build fails were that fdroid does not allow us to use prebuilt files and any proprietary software if present, the above log indicates the two prebuilt files which should be removed and also the YouTubeAndroidPlayerApi.jar which is proprietary software and hence needs to removed. So, to remove the files that are not used in the fdroid flavor and exclude them in the build process, we have to include the following statements in the build section of the metadata reference file :

     – app/src/main/jniLibs/arm64-v8a/libsnowboy-detect-android.so
     – app/src/main/jniLibs/armeabi-v7a/libsnowboy-detect-android.so
     – app/libs/YouTubeAndroidPlayerApi.jar

Once the metadata file is complete we are ready to run the build command once again. If you have properly set the environment in your local PC, build will end successfully assuming there were no Java or any other language syntax errors.

It is worth to mention few other facts which are common to Android software projects. Usually the source code is packed in a folder named “app” inside the repository and this is the common scenario if Android Studio builds up the project from scratch. If this “app” folder is one level below the root, that is “android/app”, the build instructions shown above will throw an error as it cannot find the project files.

The reason for this is as it is mentioned “subdir=app” in the metadata file. Change this to “subdir=android/app” and run the build again. The idea is to direct the build to find where the project files are.


  1. Metadata : https://f-droid.org/docs/Build_Metadata_Reference/#Build
  2. Publish an app on fdroid: https://blog.fossasia.org/publish-an-open-source-app-on-fdroid/
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Show Option to choose WiFi for Smart Speaker Connection in SUSI.AI Android APP

SUSI.AI android app has the functionality to detect the available WiFi networks and among them check for the hotspot named “SUSI.AI”. Now, this process is required so that the app can connect to the smart speaker and send the WiFi credentials, the authentication credentials and the configuration data to the smart speaker.

After on clicking the “SET UP” button on the available SUSI.AI hotspot as shown in the image below,

The app needs to make API requests where the app will send the data to the speaker, the first API that needs to be hit is for the WiFi credentials. Once the “SET UP” button is clicked the app shows a message “Connecting to your device” with a loader as in the image below :

Now during this step the code to detect the available WiFi networks is run again and the list of the available networks is sent from the DeviceConnectPresenter.kt to the DeviceConnectFragment.kt from the function defined in the presenter as follows :

override fun availableWifi(list: List<ScanResult>) {
  connections = ArrayList<String>()
  for (i in list.indices) {
  if (!list.isEmpty()) {
  } else {
      deviceConnectView?.onDeviceConnectionError(utilModel.getString(R.string.no_device_found), utilModel.getString(R.string.setup_tut))

Now to show the list of available WiFi networks a new ViewHolder had to made which contained a textview and an imageview. The viewholder file named WifiViewHolder.java is responsible for this and is used along with the DeviceAdapter only.

The interesting thing to see is that the DeviceAdapter already inflates the ViewItems of the type DeviceViewHolder. Instead of making a new adapter for the WifiViewHolder view item, I wrote some smart code that handles both the viewholders with the same adapter i.e DeviceAdapter. Let’s now see how this was handled,

In the DeviceAdapter a private variable named viewCode of type integer was made and it would be responsible to segregate the two viewholders using an if command. Here is code below that shows how using viewcode variable allows us to choose and inflate a viewholder among the two we have in onCreateViewHolder() method :

if (viewCode == 1) {
  View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.device_layout, parent, false);
  return new DeviceViewHolder(v, (DeviceConnectPresenter) devicePresenter);
} else {
  View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_wifi_item, parent, false);
  return new WifiViewHolder(v, (DeviceConnectPresenter) devicePresenter);

Now, when the viewholder of type WifiViewHolder is inflated the app displays a list of available wifi networks and on clicking any of the Wifi items the app asks the user to enter the credentials of the WiFi network. Below is how the app looks when the available wifi networks are loaded and displayed and also when we click on any of the item in the list.

References :

  1. Android manipulating Wifi networks using WiFiManager : https://medium.com/@josiassena/android-manipulating-wifi-using-the-wifimanager-9af77cb04c6a
  2. Kotlin broadcast intents and receivers : https://www.techotopia.com/index.php/Kotlin_Android_Broadcast_Intents_and_Broadcast_Receivers
  3. Android Viewholder pattern : https://www.javacodegeeks.com/2013/09/android-viewholder-pattern-example.html
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Display image responses in SUSI.AI Android app

SUSI.AI Android app has many response functionalities ranging from giving simple ANSWER type responses to complex TABLE and MAP type responses. Although, even after all these useful response types there were some missing action types all related to media. SUSI.AI app was not capable of playing any kind of image responses.So, to do this the links received in the response were used to fetch the corresponding image stored in the link.

Since, the app now has two build flavors corresponding to the F-Droid version and PlayStore version respectively it had to be considered that while adding the feature to display images any proprietary software was not included with the F-Droid version.

The JSON response from the server whenever a query for was asked gave the link to the image.  For eg : on querying : “Image of cat “ the server gave the response as :

Actions”: [


         “language”: “en”,

         “type”: “answer”,

         “expression”: “https://pixabay.com/get/e830b1072ef5023ed1584d05fb1d4790e076e7d610ac104496f0c77ea0e9bcbf_640.jpg”


So in the android app just like the usual answer type response a message was displayed with the link to the image present in the message.

Catching IMAGE response :

The image responses are of the type “answer” as seen in the server response above. So we a method had to be devised so that the responses which display the images are caught and displayed. In the file ChatFeedRecyclerAdapter.java a separate code to detect the IMAGE response was added as :

private static final int IMAGE = 17;

Next we must specify that what type of view that is to be used whenever an IMAGE response is encountered by the app. Since the action type is “answer” a specification was required to choose the type of the viewholder. Since the images are only displayed through the pixabay the URL of the images end with either “.jpg” or “.png”. So in the expression of the response if we check that it is a link and also it ends with either “.jpg” or “.png” it will be certain that the response given from the server is an image.

The code to identify the view type :

public int getItemViewType(int position) {
  ChatMessage item = getItem(position);

  if (item.getId() == -404) return DOTS;
  else if (item.getId() == -405) return NULL_HOLDER;
  else if (item.isDate()) return DATE_VIEW;
  else if (item.getContent().endsWith(“.jpg”) || item.getContent().endsWith(“.png”))
      return IMAGE;

Inflating the layout of type IMAGE

Now after determining that the response will be an image we have to inflate the layout of the viewholder to support images in the onCreateViewHolder() method . The layout  of the image response was inflated as follows :

case IMAGE:
  view = inflater.inflate(R.layout.image_holder, viewGroup, false);
  return new ImageViewHolder(view, clickListener);

Here ImageViewHolder is the view holder that is used for displaying the images , we will discuss it later in the post. Also now in the onBindViewHolder() method of the ChatFeedRecyclerAdapter.java file we have to specify the instance of the view holder if it was to support the image response. It was done as follows :

else if (holder instanceof ImageViewHolder) {
  ImageViewHolder imageViewHolder = (ImageViewHolder) holder;

ViewHolder for Images :

Like all other viewholders for different variety responses from the server a viewholder to display the images was also needed to be included in the app. So, ImageViewHolder.java was created which handles the images to de displayed in the app. In the setView() method ChatMessage object is passed and this object is  used to get the image url so that it is used to display the image using Picasso.

public void setView(ChatMessage model) {
  this.model = model;

  if (model != null) {
      imageURL = model.getContent();
      try {
      } catch (Exception e) {

And on clicking the image we can view the image on full screen using a custom chrome tab as follows  :

imageView.setOnClickListener(new View.OnClickListener() {
  public void onClick(View view) {
      CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
      CustomTabsIntent customTabsIntent = builder.build();
      customTabsIntent.launchUrl(itemView.getContext(), Uri.parse(imageURL));

Conclusion :

References :

  1. Susi server response in case of images : https://api.susi.ai/susi/chat.json?timezoneOffset=-330&q=image+of+cat
  2. Pixabay is the source used for fetching images : https://pixabay.com
  3. Display images using Picasso : https://guides.codepath.com/android/Displaying-Images-with-the-Picasso-Library


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