Tutorials & Examples

Johan Schoeman · Sep 2, 2014

This project demonstrates dithering of 8 bit grayscale images as explained at www.fiji.sc/Dithering. Methods included are the following:

Floyd-Steinberg
Atkinson
Jarvis-Judice-Ninke
Stucki...

Johan Schoeman · Aug 31, 2014

This project demonstrates the conversion of RGB images to various options of Grayscale images. It is based on the tutorial at http://www.tannerhelland.com/3643/

Click on any one of the...

Johan Schoeman · Aug 30, 2014

This project demonstrates contrast enhancement of low contrast Grayscale images based on Histogram Equalization as explained at...

jsanchezc · Feb 8, 2014

Hello,
This app is a sample to get GPS info, save into file, load list of tracks, show in map,
assign a photo and send map and log info in CSV format by email.
Also there is some code about saving...

IanMc · Jul 7, 2014

We'll do this using the Canvas object.

I'm just learning but pretending that I can teach it

Download the provided CanvasTest.zip and open it.

What I've done here is to create a panel and...

Erel · Dec 19, 2011

I have a new toy

The attached AbstractLayout.txt file includes the layouts of the Samsung Galaxy Nexus, the first Android 4.0 device.
You should copy it to Basic4android installation folder...

anallie0 · May 19, 2014

I wanted to provide this simple code for beginners like me.
The code is derived from the one written by the my teacher Klaus here.

This ListView is made with a ScrollView inside of which is...

Erel · Dec 22, 2010

The following code draws a "selection" window when you move the finger:

B4X:

Sub Globals
    Dim Canvas1 As Canvas
    Dim Rect1 As Rect
    Dim sx, sy As Int
End Sub

Sub Activity_Create(FirstTime...

EduardoElias · Feb 5, 2013

There are situations where we change the panel colors, like when the user select its own color, and we dont know if the text of the labels will be seen. Commonly we define black or white for text...

Hubert Brandel · Jul 31, 2014

Hi,

normaly B4A use UTF8 encoding, but can create files in ANSI too, but be carefull !
Windows an a Western PC use ANSI codepage 1252, this is in B4A "WINDOWS-1252".
Mostly the encoding...

stevel05 · May 18, 2014

The attached project shows the use of the USB library to communicate with Midi Devices over USB. I realize that this may open a can of worms, as it seems nothing about Midi communication is...

Johan Schoeman · Jul 27, 2014

The attached project will generate the Reed Solomon generator polynomials for 7, 10, 13, 15, 16, 17, 18, 20, 22, 24, 26, 28, and 30 error correction words that might be required for QR codes as...

IanMc · May 21, 2013

Works fine but the timer keeps cutting off in my rather big and complex app.... oh well I'll have to figure that out then.

Still perhaps useful to some.

You send it a number of milliseconds like...

SagePourpre · May 26, 2013

Hi everyone,

For the last 10 hours, I browsed every threads in "Share your creations" because I wanted to gather a lot of source code. About 1/6 of the posts actually have source code shared...

Periklis Koutsogiannis · Jul 21, 2014

Introduction

Following the moto design-more-code-less in our encapsulated b4a development speed-wagon, I created a LayoutView class that is also the core of the...

Erel · Nov 3, 2010

Please follow the installation (and configuration) instructions if you have not done it yet:
http://www.b4x.com/android/downloads.html

In this tutorial we will create a new AVD (Android...

Periklis Koutsogiannis · Jul 13, 2014

Full walk-through guide here:

http://www.b4x.com/android/forum/threads/dialogview-a-complete-walk-through-guide.43034/#post-261037

pauleffect · May 20, 2014

Hi guys. I write here hoping to help a few people.

Recently I started a project that makes heavy use of user personalization. I had bad experiences with nine patches in the past, even though I...

nicholas.jj.taylor · May 16, 2013

Hello,

I'm here to convince you to use HorizontalScrollViews instead of labels in your interfaces.

Labels get messy when you need them to display a string of indeterminate length within a...

stevel05 · Jun 14, 2014

As a response to a forum question a few months ago, I posted an example of using the Gesture Library and Soundpool to create a musical instrument interface. The example is simple an has only two...

Tutorials & Examples

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Image - Dithering 8 bit Grayscale images

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Image - 17 different ways of Converting RGB Images to Grayscale

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Image - Enhancing Image Contrast by means of Histogram Equalization and Histogram Stretching

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App to log GPS information, display map and send by eMail

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Lets play with vertical lables!

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Samsung Galaxy Nexus layout

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Graphics ListView with 2 images, two labels and populated from a text file.

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Drawing a selection window

Getting the Contrast Color (for a label, etc)

PC-ANSI encoding on B4A ...

Midi USB device manager

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QR Code - how to construct a generator polynomial

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Tick Tock Test Timers Class

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B4a projects source code.

LayoutView: The alternative way to load and use your layouts

Hello world - Installing Android Emulator

XtraViews: DialogView Tutorial (quick and dirty)

[Arguably] Better Ninepatch

Instead of Label, consider a HorizontalScrollView

MultiTrigger Soundpool Example

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Tutorials & Examples

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Privacy & Transparency

Privacy & Transparency