B4J Tutorials

New tutorial: https://www.b4x.com/android/forum/threads/server-conscrypt-and-http-2.93040/

Spoiler: old tutorial

B4J v4.00 adds support for Http/2. This is the new version of the Http protocol.

The two main...

 

This post is no longer valid! B4JS has been rewritten from the ground up and will first introduced in In ABM 4.25. Stay tuned......

 

Hello,

today i will share my Experience with the DS 18B20 Temperature Sensor.
The first step is to prepare the Raspberry PI.
edit the file:

sudo nano /boot/config.txt

insert the following...

 

This is a port of this tutorial: http://docs.oracle.com/javafx/2/get_started/css.htm

It demonstrates how CSS...

 

Tried

aToggleButton.Style=":selected{-fx-background-color:black;}"

Not working for me. Any advice?
Furthermore, how can I relate the style of a node created by code with a css file?

 

Please, see the following links for HD videos teaching B4J from the very beginning all the way through to a working application. The list will be updated in this first post as new videos are...

 

Visualizing data can be accomplished in many ways.
Here, we are using a chart to graphically depict two elements of a larger dataset - Speed and RPM of a vehicle.

Initially, I tried to store...

 

This example shows a Master (Vehicle ID) - detail (Group ID) - detail (Item id)
The fixed footer controls the Master grid (VEHICLE). Each detail is based on the...

 

ABMPivotTable allows the user to view data in a dynamic pivot table. It can answer quick questions that are e.g. not findable in a report. Note that it can only handle a couple of thousand...

 

You can find the documentation page here: http://www.b4x.com/b4j/documentation.html

Note that the documentation is not yet complete.

 

The next service you can use in WebApps using ABMaterial 1.20: Storage. With storage you can upload/download files with ease. Here is an example using it together with the new ABMFileInput...

 

This is the first of a two part tutorial on some big changes I'm making to ABMaterial in 1.09. It should be fully backwards compatible so no (or very, very little) changes will be needed from...

 

What is a ESP8266?

It's a small Basic programmabe microcontroller with Wifi, TCP/IP stack plus server, GPIO's and... it's unbelievable cheap. For about 3€ you get it as a bulk version which you...

 

When working with WebSocket handlers the client maintains an online connection. The connection is expected to be kept alive for as long as needed.

However there are cases where the connection can...

 

Edit: Web Apps tutorial: http://www.b4x.com/android/forum/threads/webapp-web-apps-overview.39811/

The server implementation is based on a popular and powerful Java server library...

 

B4x Object Browser supports B4J and is free.

https://www.b4x.com/android/forum/t...r-api-documentation-b4x-object-browser.25682/

 

I added a couple of new methods to the CRUD generator that allows code generation for an overview (similar to what you see in this feedback app):

' some new properties...

 

Building a headless app that I will wrap into an exe and run as a service, all is well compiling in debug mode, but when switching to release I want to compile to .jar but NOT run it. Workaround...

 

ABMTimeline is a component to present a time line of events. Using the ABMTimeLineElement you can create events, with some assets like images.

Update: Ignore this, I've found a more recent...

 

I've had some questions about inline editing of tables in ABMaterial. There is one way to do this, however it has its limitations and will only work in certain cases. It only works for 'String'...