Tutorials & Examples

Sometimes, we need certain things to be done but there are not APIs available, so what we do? we create our own.

I always emphasize that we need to use our imagination and be resourceful, the...

 

Since I've seen a lot of downloads on my previous tutorial HERE I've decided to write another nice looking (and hopefully useful) custom view written in 100% B4A, and I also hope you guys...

 

Every time your app draws a pixel on the screen, it takes time. Every time your app draws an opaque pixel to replace something that has already been drawn, it wastes time. Drawing a pixel more...

 

You can generate waveform from peaks json file which is generated from mp3 file.
In this source waveforms has drown with canvas.
You can customize everything about waveforms display with this...

 

Hi everybody,
I have a minimal code example. I use this code to ask for GPS activation. I was not able to find a working example of NotifyBuilder so I wrote for myself
So here it is!

Mauro

 

Here is another ScrollView example with:
- adding a row
- moving a selected row up and down
- mono-selection, clicking on one row selects it, clicking on another row unselects the previous one and...

 

Hello,

a another Tutorial in the category how to program a nice chat app.
This Tutorial builds on this.

The Realtimedatabase lib. supports filtering, with this feature you can filter your...

 

Hello,

A nice feature is to display whether a user is typing or not.

Most apps have a bubble added or by WhatsApp is a simple "wrtiting.." on top.

This is the result of this...

 

See attached project that you can use to make personalized QR codes with. Image that is superimposed over the QR code should preferably have a transparent background. You can do things like this...

 

Important: This tutorial is for educational purposes only, so we are not encouraging you to use this information for illicit purposes.

Required Andoird 4.4+ (sdk 19+)...

 

General Information

Normally it is not possible to create several widget instances of the same homescreen widget which all display different data.

I found a solution for this and with...

 

Hello All.

Just thought I would share some info with you. Most of our services in our apps would use

Service.StartForeground(1,main_service.n1)

in the service create sub, where...

 

Important for Huawei users (or others):

Make sure your energy settings don't pause your app (even the firebase service). Huawei calls it "protected apps". If your app isn't protected...

 

Hi all.

This example shows the images contained in a certain directory, with pinch zoom and smooth scroll -when image is zoomed- capabilities (provided by JSTouchImageView library, from...

 

I made for beginer detailed description of how to prepare a computer and phone to create mobile applications on the platform Android. I myself Russian therefore made the instruction in Russian and...

 

I'm currently developing an App that'll be released for Android and IOS. It presents "files" to the user, allows them to select a file and then presents the content for editing, and finally allows...

 

Update (2017/10/17): For code changes that make this a true B4X update, see post #4

This relates to the FTP Server code posted here...

 

Update: Code to reconnect added


I've bought a BT handheld scanner on Ebay for about 45€ like this:


It comes with a sheet with barcodes which can be scanned to do some...

 

A new more powerful framework is now available: Remote Database Connector.

This tutorial is a follow up to the previous tutorial that explained how to connect to a MySQL...

 

A code module to automatically generate SetLayout statements with percentage values.

It is more convenient to use than my example:
Create your layouts based on percentages...