Firecart: a shopping cart with a Firebase backend

Recently i was intrigued by Firebase service, a powerfull service for realtime and reactive apps: the problem i solve is a shopping list that permits to load items on a device, think about a wife at home that needs something, and another device with the same app installed and that in real time will see the list updated.

Also, i have separated the app in 2 files:

  1. firecart.js: this file contains the logic, event handlers etc
  2. createLayout.js: this file contains the various layout and controls of the app

As already stated the app is based on a firebase backend, but to avoid users to have to register to the service, login to the dashboard and create a Firebase app ad data structure,  i designed the app as multiuser or if preferred as multigroups:everyone can define its own group with private data; at first start users will access to a samplecart group.

The app can be localized and has IT (the default) and EN langs, but you can extend for other languages: you simply have to add a txt file, ie DE.txt for Deutch or JPN.txt for Japanese, in the /sdcard/fireLangs folder: it is a plain object with couple-value pairs for the various label; refer to one of the file already here for details. Of course you can cut unusefull languages deleting the corrisponding files: firecart dinamically loads the list of the files in the folder when launched

The use is very simple: at launch you see a layout with a list of pending items: check the appropriate check and press the large btn on bottom.

On the main screen you find:

  • up right btn: click to go to the section where you can compile the list of items
  • up left icon: long touch to go to the section where you can create new group, change group; here you can also change language from a list of already available ones; to change group you have to digit name and password: if the inserted name is not present the app will ask if you want to create it.

You can download the firecart.apk to install and use it, 

If you area DroidScript user, as i hope, you can download filecart.spk ; to install the spk properly, download it in the Download folder, move here, select  the spk and do share to DroidScript.

You can download too: unzip its content (js files, img folder etc) in /sdcard/AndroidScript/firecart

Revisited on 27.11.2014

I added to features to the app:

  1. if for any reason Firebase data are not ready, you cannot go to the page where the list of items is loaded;
  2. now the passord field in the section where you select the group is masked.

Point 2 required adding a new label, in IT and EN, for no database connection so if you had already instrlled firecart, delete the /sdcard/firelangs on reinstall.

I've written this app as a proof of concept on using realtime backend, in this case FIREBASE, so you may note that code is not optimized; also, in a real world app surely you have to sign an account on Firebase, they have a limited plan for free, and secure it with autenthication.

Fell free to comment this post or app: i'll appreciate a lot.

Richard King
on Friday 14 November 2014 04:20 AM
Hi. i'm interested in your example but the spk will not load into the editor. if i try unzipping it with 7zip it does not look like any other spk. Can you provide a new link to the spk, please?
salvatore fusto
on Wednesday 26 November 2014 02:38 PM
Richard, excuse for this delay, i'm adding other feature: test for connection status plus an encrypted field forma password then i'll provide a corrected link.
Thanks and regards
Salvatore Fusto
on Thursday 27 November 2014 10:43 AM
Richard,i updated the app and changed the source format from spk to zip so you'd not have any problem.
on Thursday 24 December 2015 10:37 PM
I had also the sane problem to upload this zip file. You made the app into two designs for accessing into the dashboard if required. But I still do not make sense why you allow all the users to access into the main firebased backen? I think the users should access into the source with a legal registration.
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This is only a proof of concept to test a Droidscript app with a realtime backend based on Firebase, absolutely it is not a professional app where surely you are right on secutity.
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