Android Question Data and image download speed in an application similar to WhatsApp web

[jose luis gudino]

We are developing an application similar to WhatsApp web, everything is working well, except when it brings me the information from the database when I log in, depending on the information it has, the process is slow. I have observed that when you open a new WhatsApp or Telegram session on a PC the images and chats refresh almost immediately, does anyone have an idea how they do it? greetings. Thank you very much in advance

 

[Sagenut]

I think that the small thumbnails are so small that the download is lightning fast.
When you click to enlarge you can notice that it needs a couple of seconds to retrieve the full size image.
So for every avatar you should have 2 files:
One for thumbnail and one for full size.

 

[jahswant]

Use LazyLoading And it's important to download and save images and only redownload when needed.

 

[jose luis gudino]

I think that the small thumbnails are so small that the download is lightning fast.
When you click to enlarge you can notice that it needs a couple of seconds to retrieve the full size image.
So for every avatar you should have 2 files:
One for thumbnail and one for full size.

Hello, I like that idea, I'm going to try downloading the data without downloading the image, to see if the download speed improves, I compress the images even more, I have a function that compresses them.

 

[Sagenut]

You could save the avatar images like this (just an idea):
MyAvatar.jpg as the Full Size image at 1200x1200 resolution.
MyAvatar_t.jpg as the thumbnail at 150x150 resolution.
When scrolling the contacts list you load the thumbnails.
When needed request the full size image.

 

[jose luis gudino]

Use LazyLoading And it's important to download and save images and only redownload when needed.

Thanks for the help. If the problem is the images I will read about this topic (LazyLoading)

 

[jose luis gudino]

The images are already resolved, they load very quickly, now the issue is that I have to make the chat function like WhatsApp, that is, it only loads the latest conversions and that is what is shown and then as you scroll The customlistviews are reloaded upwards, it is as if they were loaded from the bottom up, can I explain the idea?

 

[Sagenut]

Load your items in reverse, with InsertAt(0) and jump to the last item of the clv.

 

[jose luis gudino]

Load your items in reverse, with InsertAt(0) and jump to the last item of the clv.

Let me try, and comment, thank you

 

[jose luis gudino]

Hello everyone, this is the solution.

[B4X] CLVBackwards - xCLV extenstion for lists that grow backwards

This class can be helpful in esoteric cases where the list grows up instead of down. Think of a chat app where you start with the most recent messages and when the user scrolls up, more older messages are added to the top. The challenge here is to add items without making the list jump back and...

www.b4x.com