Tutorials & Examples

New tutorial: [B4X] OkHttpUtils2 / iHttpUtils2 and accept all option

Spoiler: irrelevant

The HTTP library and the underlying Apache HTTP component takes care of secured web pages automatically. The...

 

An example of the rotating earth with 3 x image views displaying the same GIF file but each separated by 120 degrees from the other. You will need to download the GIF file from here...

 

This program displays pics of the same size as the ImageView. Made on an 7 inch tablet.
Program is not ready to go. Need to create folder and place same size pics in folder.
My device info is...

 

This was done just for fun. It is a 24 hour analogue clock/watch. Have used the GPS Example from @klaus as base for this clock.
JHS CLOCK V1 => a 24 hour clock running clockwise...

 

I've made a very simple project which periodically connects to a VB6 Server.
The code is well commented with notes for programmers coming from VB6.

In this code I use once ExitApplication. It's...

 

Random Numbers.
Timer.
ExitApplication.

 

Service Module using CallSub.

A very simple example. I thought you had to use CallSub from an Activity, but had it backwards.

 

NOTE: there may be a way to achieve this already in B4A that I'm not aware of.

This little tutorial will show you how to create an app with translucent status bar And/Or navigation keys...

 

If you build an app which uses a larger form you might have realized this by pairs of labels and edittexts. The label ist used for the description (f.e. "Name") and the edittext will contain the...

 

Here's a quick little example of how to shorten your urls using tinyurl.com.

Thanks to TDS, who provided the solution.

 

ie: If you want to make a music control widget

First you need to add a broadcast listener to the manifest

AddReceiverText(thenameofyourservice,
<intent-filter>
<action...

 

This project demonstrates grayscaling of a multi colored image and then the binarization (i.e black or white pixels only) of the grayscaled image. The binarization is based on Otsu Thresholding as...

 

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...

 

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...

 

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

 

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...

 

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...

 

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...

 

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...

 

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

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

Sub Activity_Create(FirstTime...