Changing Profile Image in Open Event Android

A user can create a custom Avatar in Open Event Android. We use Picasso Library for easy image loading and caching in Open Event Android. This blog post will help you understand how its implemented in Open Event Android.

These are the steps we follow :

  • Create UI element which allows the user to pick an avatar
  • Checking and requesting Read External Storage permission
  • Compress and Encode Image
  • Use Picasso to display image on UI
  • Upload it on the server on user’s command

We will discuss the above steps in detail in the following section.

Create UI element which allows the user to pick an avatar

To display the selected avatar image as well as to fire image pick action when clicked we need a UI element. We display a placeholder in case no avatar image is provide, in this case, its ic_account_circle_grey_24dp which lies in drawable folder. Rest of the code is self explanatory.

       android:contentDescription=“Profile Photo”
       app:srcCompat=“@drawable/ic_account_circle_grey_24dp” />

Once we have created the UI we need to wire it with the action to pick an image, the following code snippet does that. When this ImageView is clicked permissionGranted variable is checked which keeps a track of read external storage permission if this is true file chooser is displayed to allows user to select an image else an dialog for requesting permissions is shown.

rootView.profilePhoto.setOnClickListener { v ->
           if (permissionGranted) {
           } else {
               requestPermissions(READ_STORAGE, REQUEST_CODE)

Checking and requesting Read External Storage permission

As discussed in the above section permission check is performed when ImageView is clicked and if not granted a dialog request for read external storage is displayed. Initially, the boolean permissionGranted is set to false which means clicking on ImageView fires requestPermission method with permissions array and request code and by overriding the onRequestPermissionResult method we can look at request status.

override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
       if (requestCode == REQUEST_CODE) {
           if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
               permissionGranted = true
               Toast.makeText(context, “Permission to Access External Storage Granted !”, Toast.LENGTH_SHORT).show()
           } else {
               Toast.makeText(context, “Permission to Access External Storage Denied :(“, Toast.LENGTH_SHORT).show()

onRequestPermissionsResult is called everytime requestPermission finishes, to check for which request it’s called we can check the Request code if it matches with the one we passed in our requestPermissions method that means the grant result carries information about our request. We can check the grantResult and if permission is granted we set our permissionGranted variable to true and display the file chooser menu.

Compress and Encode Image

Once the user picks the image from the file chooser we need to convert it into an input stream and we encode it into our JPEG format and specify the image quality. The following code snippet will help you understand how this happens.

val imageUri =
           var imageStream: InputStream? = null
           try {
               imageStream = activity?.contentResolver?.openInputStream(imageUri)
           } catch (e: FileNotFoundException) {
               Timber.d(e, “File Not Found Exception”)
           val selectedImage = BitmapFactory.decodeStream(imageStream)
           encodedImage = encodeImage(selectedImage)


The above code is executed after picking the image from file chooser. The image is first converted into input stream (this process is put inside a try catch because the conversion process may result in file not found exception) and then BItmapFactory’s decodeStream is called on it, all this is done so that we can convert URI into to bitmap now this bitmap is converted into JPEG format with 100 percent quality and then into a Base64 type string using the function encodeImage.

Finally, we use Picasso standard functions to load the image into UI we also specify placeholder image which is displayed if anything fails or image is loading.

Upload Image on the server on user’s command

If the user wish to keep the selected image as its avatar he can click on update button in open event android. This button fires a post request which uploads the image data to open event server followed by a patch request to add the URL to User information.

   fun uploadImage(@Body uploadImage: UploadImage): Single<ImageResponse>

This is the post request made to the server the body contains an UploadImage object which essentially caries a String type data variable containing the Base64 encoded jpeg bitmap. In response to the request, the server returns a URL which is then added to the User object and a patch request is made to update the user on the server

   fun updateUser(@Body user: User, @Path(“id”) id: Long): Single<User>


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Hiding Multiple Attendee Recycler for Single Tickets in Open Event Android

Multiple attendee recycler allows the user to easily write in attendee details for all tickets he/she is buying. The UI for attendee details fragment can be divided into two segments, one contains the details of the person creating the whole order and followed by multiple details section for the attendee of every ticket. This is a good way to take details when multiple ticket or tickets with greater than 1 quantity is involved. However, if there is only one attendee detail to be taken instead of asking the user for order creator’s details and then first attendee details it is better to add some views in the creator segment and not ask for the same details again from the user. This blog post will help you in understanding how it’s done in Open Event Android.

Keeping a track of orders with single attendee

We keep a boolean to track whether or not the sum of quantities of tickets selected by a user is one since one attendee is to be generated per ticket quantity. And incase it is boolean variable singleTicket is set to True which is false by default initially. Following is how it can be done

singleTicket = ticketIdAndQty?.map { it.second }?.sum() == 1

The above statements basically iterate over the list of pairs of tickets and their quantity and then sums over the second element of all pairs that is the quantities, if the summation leads to 1 single ticket is set to True else false.

Adding elements to recycler adapter

The next step is to update the logic as to when blank attendees are added to recycler adapter. The idea is to check the boolean singleTicket and if it is false dont insert any attendee., Observer {
               it?.let {

                   if (!singleTicket)
                       it.forEach {
                           val pos = ticketIdAndQty?.map { it.first }?.indexOf(
                           val iterations = pos?.let { it1 -> ticketIdAndQty?.get(it1)?.second } ?: 0
                           for (i in 0 until iterations)
                               attendeeRecyclerAdapter.add(Attendee(attendeeFragmentViewModel.getId()), it)

If a single ticket is false regular procedure to add blank attendee is carried out. The quantity of ticket is found and the same quantity of attendees are added to recycler adapter’s attendee’s list similary ticket information is also added to the recycler adapter. The id for blank attendees is taken from the attendeeViewModel’s getId function which in turn simply returns id using the authHolder’s getId function.

Modify the register method to check for the single attendee

So far what we have discussed helps us display the right no of details section on the UI. We will also have to modify the register method to take into account the above changes. Following is the implementation of what happens when the user selects register.

rootView.register.setOnClickListener {
               if (selectedPaymentOption == “Stripe”)

               val attendees = ArrayList<Attendee>()
               if (singleTicket) {
                   val pos = ticketIdAndQty?.map { it.second }?.indexOf(1)
                   val ticket = pos?.let { it1 -> ticketIdAndQty?.get(it1)?.first?.toLong() } ?: –1
                   val attendee = Attendee(id = attendeeFragmentViewModel.getId(),
                           firstname = firstName.text.toString(),
                           lastname = lastName.text.toString(),
                           city = getAttendeeField(“city”),
                           address = getAttendeeField(“address”),
                           state = getAttendeeField(“state”),
                           email = email.text.toString(),
                           ticket = TicketId(ticket),
                           event = eventId)
               } else {
               val country = if (country.text.isEmpty()) country.text.toString() else null
               attendeeFragmentViewModel.createAttendees(attendees, country, selectedPaymentOption)

For create attendee object and then add it to the attendees ArrayList first we need to find the ticket it is to be created for as the attendee object accepts Ticket Id as one of the parameters. The logic to get the ticket is fairly straightforward if singleTicket is true first we find out the ticket for which quantity is 1 and then we get the ticket object for the same. Finally, we take the id field of the ticket and add it to our attendee constructor. Other fields for attendee such as first name, last name, email, and country are taken from the EditText View’s rendered on the screen. Else if the single ticket is false which means there are multiple attendee details section on the fragment we simply add the recycler adapter’s attendee list into attendees ArrayList which is later provided to the order function for creating an order of it.


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Sorting Photos in Phimpme Android

The Phimpme Android application features a fully fledged gallery interface with an option to switch to all photos mode, albums mode and to sort photos according to various sort actions. Sorting photos via various options helps the user to get to the desired photo immediately without having to scroll down till the end in case it is the last photo in the list generated automatically by scanning the phone for images using the Android’s mediaStore class. In this tutorial, I will be discussing how we achieved the sorting option in the Phimpme application with the help of some code snippets.

To sort the all photos list, first of all we need a list of all the photos by scanning the phone using the media scanner class via the code snippet provided below:

uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
      String[] projection = {MediaStore.MediaColumns.DATA};
      cursor = activity.getContentResolver().query(uri, projection, null, null, null);

In the above code we are using a cursor to point to each photos and then we are extracting the path of the images and storing it in a list using a while loop. After we generate the list of path of all the images, we have to convert the into a list of media using the file path using the code below:

for (String path : listOfAllImages) {
          list.add(new Media(new File(path)));
      return list;

After generating the list of all images we can sort the photos using the Android’s collection class. In Phimpme Android we provide the option to sort photos in different categories namely:

  1. Name Sort action
  2. Date Sort action
  3. Size Sort action
  4. Numeric Sort action

As sorting is somewhat heavy task so doing this in the main thread will result in freezing UI of the application so we have to put this into an AsyncTask with a progress dialog to sort the photos. After putting the above four options in the menu options. We can define an Asynctask to load the images and in the onPreExecute method of the AsyncTask, we are displaying the progress dialog to the user to depict that the sorting process is going on as depicted in the code snippet below

AlertDialog.Builder progressDialog = new AlertDialog.Builder(LFMainActivity.this, getDialogStyle());
dialog = AlertDialogsHelper.getProgressDialog(LFMainActivity.this, progressDialog,
      getString(R.string.loading_numeric), all_photos ? getString(R.string.loading_numeric_all) : getAlbum().getName());;

In the doInBackgroundMethod of the AsyncTask, we are sorting the list of all photos using the Android’s collection class and using the static sort method defined in that class which takes the list of all the media files as a parameter and the MediaComparator which takes the sorting mode as the first parameter and the sorting order as the second. The sorting order decides whether to arrange the list in ascending or in descending order.

getAlbum().setDefaultSortingMode(getApplicationContext(), NUMERIC);
Collections.sort(listAll, MediaComparators.getComparator(getAlbum().settings.getSortingMode(), getAlbum().settings.getSortingOrder()));

After sorting, we have to update the data set to reflect the changes of the list in the UI. This we are doing in the onPostExecute method of the AsyncTask after dismissing the progress Dialog to avoid the window leaks in the application. You can read more about the window leaks in Android due to progressdialog here.


To get the full source code, you can refer the Phimpme Android repository listed in the resources below.


  1. Android developer guide to mediastore class:
  2. GitHub LeafPic repository:
  3. Stackoverflow – Preventing window leaks in Android:
  4. Blog – Sorting lists in Android:
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