Tutorials & Examples

Erel · Dec 3, 2017

Backward compatibility = the ability to open projects developed with older version of the IDE in a newer version of the IDE.

Backward compatibility is a critical feature for programming languages...

Johan Schoeman · Dec 2, 2017

I have tested this on an Android 7.0 device only - take a screenshot of your activity. You need to enable the JavaObject library to make use of it.

@JordiCP solved my initial problem here...

mesutaslan · Jul 11, 2016

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...

Erel · Feb 3, 2011

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...

T201016 · Nov 24, 2017

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...

Erel · Nov 28, 2010

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...

infow · Dec 1, 2016

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...

Erel · Jun 20, 2013

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...

Informatix · Oct 8, 2014

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...

NJDude · Nov 19, 2017

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...

NJDude · Nov 15, 2017

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...

Multiverse app · Nov 17, 2017

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...

megzz · Nov 17, 2017

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...

tigrot · Apr 21, 2017

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

klaus · Apr 23, 2011

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...

Alexander Stolte · Nov 14, 2017

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...

Alexander Stolte · Nov 12, 2017

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...

Johan Schoeman · Jul 16, 2015

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...

Star-Dust · Nov 12, 2017

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+)...

corwin42 · Feb 1, 2013

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...

Tutorials & Examples

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[B4X] Backward Compatibility

Take a Screenshot with Inline Java Code

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Producing unsigned apk and sign it with eclipse/adt keystore

[B4X] AsyncStreams Tutorial

Compass: TRUE HEADING & Magnetic Declination.

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Text files

Downloading and Printing 1 Bit BMP to ESC/POS Printer

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Android Wifi-Direct Tutorial

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Shaders in libGDX

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IPInfo - B4A Library source code

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CustomBottomSheet - B4A Library source code

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GPU overdraw

Create wave form

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Notify Builder example

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ScrollView example with multiselection and SQL

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Firebase Realtimedatabase get a chat or content preview (filtering)

Firebase Realtimedatabase user is typing feature

Create Personalised QR Codes

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WhatsApp Spy (educational purposes only)

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Multiple instances of the same widget

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Tutorials & Examples

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Privacy & Transparency

Privacy & Transparency