Tutorials & Examples

Starting from August 2019 for new apps and November 2019 for updates, Google Play requires apps to set targetSdkVersion to 28.

The tutorial was updated with information related to API level 28...

 

This example demonstrates how you can use an OCR web service to recognize text in camera images.

The program allows you to take a picture and then send it to OCRWebService.

OCRWebService...

 

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...

 

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

The example...

 

Depends on B4XTable v1.01+

It is very simple to add your own navigation features.

Code:

Sub btnNext_Click...

 

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...

 

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...

 

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

 

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...

 

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

 

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...

 

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...

 

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.

...

 

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...

 

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...

 

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...

 

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...

 

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

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

 

As you might know, I do a lot of apps which communicate with my Apache servers via httputils and php. For a longer time I was missing some strong encryption. I knew that there was agrahams...

 

xCustomListView v1.50 adds an important new event named VisibleRangeChanged. This event is fired whenever the visible range of items changes.

We can use this event to defer the items creation...