Tutorials & Examples

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...

 

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...

 

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...

 

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...

 

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...

 

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...

 

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...

 

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...

 

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...

 

Full walk-through guide here:

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

 

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...

 

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...

 

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...

 

Pragmas: table_info, index_list, index_info, foreign_key_list

The full list of pragmas can be found at: http://www.sqlite.org/pragma.html. Note, the [match] field of the [foreign_key_list] pragma always shows...

 

I have a very specialized POS application running on Android devices that would not qualify to be entered into the Play Store. These apps need to be updated whenever there are new features or bug...

 

It is recommended to use HttpUtils2 instead of this code module. HttpUtils2 is more powerful and is easier to work with.

As discussed in the Services tutorial, some tasks are...

 

Hello,
The code example below retrieves HTML content from WebView via three different techniques: 1.) MenuItem 2.) LongClick 3.) PageFinished. The code calls addJavascriptInterface() &...

 

Hi,
I have assembled a few examples and I added the code to have a system to control via Bluetooth remote viewing of clips from youtube with two smartphones. A "slave" to be connected with a hdmi...

 

With this samplecode i will demonstrate to create a dynamic jpg from other image, put text´s on it, copy another image to it...

ATTENTION: This b4a-example uses CreateMap so you need B4A...