Tutorials & Examples

Example was updated based on FileProvider class: https://www.b4x.com/android/forum/threads/class-fileprovider-share-files.97865/
See the above link if you are interested in sharing...

 

Using the NFC library you can read NFC tags formatted in NDEF form (NFC Data Exchange Format).
You can read more information about the internal process here: NFC Basics | Android Developers...

 

Android Support Library was implemented and maintained in the last 8 years by Google. It includes a wide range of features and it hides many of the differences between the various Android...

 

This is an extension to the MQTT chat room example: https://www.b4x.com/android/forum/threads/b4x-mqtt-chat-room.61568/#content
It is a chat room where one of the devices acts as a server...

 

Hello

I would like to share some observations with you all, is is based on https://www.b4x.com/android/forum/threads/background-location-tracking.99873/#post-628468

A problem that we all...

 

The "index pattern" is a pattern that you can see in many examples and libraries where resumable subs are used. It is a simple solution to avoid race conditions and unexpected states.

The...

 

Better to use: https://www.b4x.com/android/forum/threads/simple-progress-http-download.127214/#post-796463

The attached project includes a slightly modified version of HttpUtils2 and...

 

Starting from Basic4android v2.50 you can compile your project, or part of it to a regular library.

Why should I compile a library?

• Break large projects into several smaller (more...

 

I decided to become Google's darling. After a very old B4A app, that went perfect for many many years (API 8, targetSDK 14), was threatened to be thrown out of the app store, I decided to waste my...

 

The attached B4J example demonstrates how to implement lazy loading with editable items.

There are several interesting points...

 

We start with a few DIMs for needed Variables

sub Globals
    Dim ffiles,ffolders As List
    Dim root As String
End Sub

and a main sub from this tutorial

Sub ReadDir(folder As String...

 

Hello,

This is the first time I am preparing a tutorial for this great community so please excuse me for any mistakes or weak explanations. Methods of some of the implementation may not be %100...

 

Question: How can I build a layout with X controls spread horizontally or vertically?

Answer: You can use the designer script for this. As the designer script engine (currently) doesn't support...

 

Several developers were interested in adding support for signature capturing in their Android application.
The attached code module makes it easy to capture the signature and save it to a file...

 

What is Version Control?

Spoiler

Version control software keeps track of every modification to the code in a special kind of database. If a mistake is made, developers can turn back...

 

Part 1: The key

This is just a write up of my findings regarding the exchange of encrypted data between B4A/B4J and LockBox3 (Delphi). This write up focuses just on LockBox3's implementation of...

 

Google Maps uses the GPS as its location provider. It will not show the current location if GPS is disabled.
It is possible to switch to a custom location provider.

For example, here is me...

 

If you have modern processor from AMD (Ryzen) - x86-variants of AVD cannot work by default.
Android emulator now requires the processors with a virtualization only.

By default Intel processors...

 

Hi,

If your Facebook and firebase configurations are all ok but the auth event is not raising or if you are getting An account already exists with the same email address but different...

 

Hi everyone,

there is a new way to create the localizator class csv file and it is as easy now as it could never be in the past. Just watch the following video:

(23-6-2019)

In order...