Tutorials & Examples

[B4X][IoT] - Monitor the home temperature with Adafruit IO

• By Erel
• Jun 19, 2017

Adafruit IO is a cloud service built for IoT solutions. It provides two interfaces: MQTT and REST API. It is very simple to use it with B4X as demonstrated in this example.

It is more than...

 

Attachments

• B4R_IO_Adafruit.zip

  1.1 KB · Views: 1,251
• B4A_IO_Adafruit.zip

  8.1 KB · Views: 1,672
• B4i_IO_Adafruit.zip

  3.6 KB · Views: 925
• B4J_IO_Adafruit.zip

  2.4 KB · Views: 1,067

Last edited: Jun 20, 2017

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[B4X] Input dialogs with XUI Views

• By Erel
• Jan 6, 2019

B4XDialog from XUI Views library can show simple dialogs, template based dialogs and custom dialogs.

The example...

 

Attachments

• B4A Dialogs.zip

  10.5 KB · Views: 5,288
• B4J Dialogs.zip

  3.7 KB · Views: 1,814
• B4i Dialogs.zip

  62.4 KB · Views: 1,336

Last edited: Jan 23, 2019

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[B4X] B4XTable - Adding custom navigation buttons

• By Erel
• Feb 6, 2019

Depends on B4XTable v1.01+

It is very simple to add your own navigation features.

Code:

B4X:

Sub btnNext_Click...

 

Attachments

• B4XTable With Navigation Buttons.zip

  59.9 KB · Views: 1,273

Last edited: Apr 8, 2019

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Check Trial Period using Dropbox (new with admin tool)

• By Tempomaster
• Mar 30, 2019

Check Trial Period using Dropbox (first version, improved version in Post #2)

Hello,

I have tried to find a solution to solve the control of the trial period of an app using the...

 

Attachments

• encryptpw.zip

  297.9 KB · Views: 495
• jackson-core-2.7.4.jar

  247.1 KB · Views: 489
• trialcheck.zip

  347.4 KB · Views: 458

Last edited: Apr 3, 2019

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Simple example B4XDrawer sliding drawer class with materialicons and fontawesome icons

• By A0_2_A7
• Apr 4, 2019

Good afternoon, I contribute to the community with a small example of the class B4XDrawer with material icons and fontawesome icons.

Thanks to the whole...

 

Attachments

• Simple_example_B4XDrawer.zip

  12.4 KB · Views: 1,049

Last edited: Apr 4, 2019

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Android InApp Purchase Tutorial + Source Code

• By ilan
• Feb 18, 2016

Hi,

in this tutorial i will show you how to add an in app product to your android app.

There is an official tutorial by @Erel so you should also check that out...

 

Attachments

• InApp.zip

  3.2 KB · Views: 920

Last edited: Jun 11, 2019

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Auto restart an Android Application after a Crash

• By OliverA
• Mar 18, 2019

Sources used:
Main sources:
https://medium.com/@ssaurel/how-to-...r-a-crash-or-a-force-close-error-1a361677c0ce...

 

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Trial Period using FTP

• By gregchao
• Jul 20, 2018

Here is a method using FTP to create a trial period for your app. Since there is no local file with trial information, the user cannot defeat it by manipulating stored data. Also, FTP calls are...

 

Last edited: Jul 23, 2018

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[Advanced] Using a custom view written with Kotlin

• By Erel
• Mar 25, 2019

Using Kotlin libraries is similar to using Java libraries. The only difference is that we need to add references to two...

 

Attachments

• CameraVideoButton.zip

  8.3 KB · Views: 736

Last edited: Mar 25, 2019

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Setting custom font for whole application without any library

• By Brandsum
• Dec 1, 2018

Hi everyone,

After a week I have finally figured it out how to add a custom font for the whole application without any library or extra code.

Here is the solution:

1. Create a folder...

 

Last edited: Dec 2, 2018

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JRC2 - Home banking coordinates card (open)

• By ocalle
• Mar 19, 2019

Hello, excited to share my humble code, which can be used as a two-factor authentication or a secondary login. For this take as an example the use of the bank coordinates card, which allows you...

 

Attachments

• b4aexample.zip

  13.8 KB · Views: 445
• Server TEST.zip

  5.5 KB · Views: 418
• card.jpg

  116 KB · Views: 478

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Create PDF with b4a and php

• By DonManfred
• May 10, 2014

Hallo,

from time to time someone is asking on how to create a pdf with b4a.
I dont know how to do that ONLY with b4a.

Today i spend a few hours to write a b4a-example and a php-script which...

 

Attachments

• b4aexample_createpdf_1.1.zip

  12.7 KB · Views: 1,486
• 20140530_082501_356253050101034.pdf

  25.3 KB · Views: 1,494

Last edited: May 30, 2014

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Native Ads Unified with MediaView

• By asales
• Dec 12, 2018

* This ads are still not available to all developers.

The code of the example are based in this code from @Erel (Thanks!)...

 

Attachments

• nativeads_mediaview.zip

  8.4 KB · Views: 624

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AdMob Mediation (with InMobi)

• By Erel
• Sep 26, 2016

AdMob supports ads mediation. This means that the ad can come from different ad networks and not just from Google AdMob network.

It can improve the fill rate and the revenue earned.

...

 

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[Tool] Enhance your layouts with the "Layout bounds" developer option

• By fredo
• Feb 25, 2019

The creation of layouts is very easy with the B4A Designer.

With more complex forms, however, it can happen that the result looks a bit weird. Usually the heights or distances between the...

 

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Android Daydream / DreamService tutorial

• By Erel
• Jan 7, 2013

Android 4.2 includes a new powerful screen saver feature named Daydream.

A "dream" starts when the device is docked or charged and the screen timeouts. By default dreams are non-interactive...

 

Attachments

• Daydream_Circles.zip

  6.7 KB · Views: 1,061
• Daydream_Webview.zip

  6.9 KB · Views: 1,060
• Daydream_library1.0.zip

  4.8 KB · Views: 1,048

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fuel gauge

• By Mr Blue Sky
• Oct 27, 2018

Thanks to the excellent work of Klaus and Rotating Needle exemple, I needed a gas gauge

B4X:

#Region  Project Attributes
    #ApplicationLabel: fuel gauge...

 

Attachments

• fuel gauge.zip

  425.6 KB · Views: 771

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[B4X] B4XTable - Editable table and export to CSV

• By Erel
• Feb 18, 2019

This example shows how to modify the table data. When the user clicks on a cell we show an input dialog and let the user...

 

Attachments

• B4XTable-Editable.zip

  52.1 KB · Views: 2,340

Last edited: Apr 11, 2019

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[B4X] Tip - Modified server response

• By Erel
• Feb 27, 2019

While analyzing a Crashlytics crash report of a small app of mine I was surprised to see the following error:

Fatal Exception: java.lang.NumberFormatException
For input string...

 

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B4XTable - Photos Album

• By Erel
• Mar 3, 2019

In this example the table is used to show the camera roll photos.

Main steps:
1. Get permission to access the external...

 

Attachments

• B4XTable-Album.zip

  10.7 KB · Views: 927

Last edited: Jan 11, 2021

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