Tutorials & Examples

Ok, this is my first tutorial so please be kind about my errors


Here is problem : You have an app made without B4A. You wantto remake it but you need to sign it with your old...

 

New video tutorial:


AsyncStreams allows you to read data from an InputStream and write data to an OutputStream without blocking your program. The reading and writing are done...

 

I am presenting a test project - Compass. Post #1
- displays TRUE HEADING with local magnetic declination.

Tested in parallel with the application AndroiTS GPS Test v.1.48 Free...

 

Many applications require access to a persistent storage. The two most common storage types are files and databases.
We will cover text files in this tutorial.

The predefined Files object has...

 

Using the feature of resident images of Datecs dpp250. This is the way I found with Erel help to convert a 1 Bit BMP to ESC format, download to the printer, clean printer memory, write printer...

 

Android 4+ devices support Wifi Direct (Wifi P2p). Wifi Direct allows you to connect two devices over wireless without an access point. It is similar to Bluetooth with a much extended range and...

 

In this tutorial, I'm going to modify the Perf_Flakes demo of the libGDX library to explain how to use shaders with your objects rendered by lgSpriteBatch. I'm NOT going to explain the basics of...

 

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...