Tutorials & Examples

Android development starts here. Please do not post questions in this sub-forum.

Hint: solving compiler error "Unknown member: initializenewinstance"

I ran into this one today and fortunately my penny dropped rather quickly, though I didn't find anything on the forum about this error; hence this post as it might be useful for others. I was...
 

CHART JS IN ANDROID

Hi i make this example how you can add Chart JS in your project.


I was use this example...
 

Attachments

  • CHARTJS.zip
    218.7 KB · Views: 635

FitBit Authentification and use of the FitBit Web Api (http)

Fitbit_app_icon.png FitBit OAuth and HTTP SDK

You need to define an App in the FitBit Console at https://dev.fitbit.com/apps

Make sure to set your "OAuth 2.0 Application Type" to...
 

Attachments

  • FitBitEx.zip
    11 KB · Views: 642
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Control your Android device from your Windows PC

This is very clever software and when I first saw it, it blew my mind. It took a couple of seconds for me to comprehend what I was seeing.

The program is called ScrCpy and when run on your...
 

Getting List of Files of a webserver directory via httputils2 & php

When you like to download files with httputils2 you need to know the files by name. There are some examples using ftp or a generated xml file with the contents first. To me this could be easier...
 

[B4X] get fav icons from a website

Fan Menu

After all the work I went through to make the simple pie graph, I noticed I had 90% of the code to make a "Fan Menu" type library so I went ahead and created the following prototype...
 

Attachments

  • fan_menu.zip
    221 KB · Views: 1,092

✅ Retrieving 2 JSON data feeds from an online server (Wear OS watch face) - Newer developers

Hello All
Here we have a simple example of how you use corwin42s WatchFace Library. The WatchFace library is extremely simple to use, corwin42 has done a great job wrapping it, thank...
 

Attachments

  • JSON.zip
    13.1 KB · Views: 751
  • LEDCoronavirus_V1.0.0.1.zip
    111 KB · Views: 742
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Updating an embedded DB

A common task we face while enhancing our apps is the need to update the structure of a running DB.
This is relatively easy if you know for sure that your users will all go from version 1 to...
 

Connect Android to MySQL Database Tutorial

A new more powerful framework is now available: jRDC2.

This tutorial explains the basic concepts required for creating a connection between Android device and a remote server. In this...
 

Attachments

  • MySQL.zip
    8 KB · Views: 17,910
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Controlling Sonoff S20 smart power plugs [B4X] [Home Automation]

Android SMB / CIFS tutorial

[B4X] [B4XPages] Pleroma / Mastodon Client

Roughly speaking, Mastodon is an open source, distributed, social network a bit similar to Twitter:

Pleroma is a lightweight implementation of Mastodon with some...
 
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OpenCV and Tensorflow methods for chessboard and chessfigures detection/classification

Two apps show methods and their usage to recognize chess figures and their position based on a camera shot, one using only OpenCV image processing and utils (Chessboard OCV) and the second one...
 

Attachments

  • Chessboard image processing.pdf
    229 KB · Views: 1,323
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Integrating In App Purchase in B4A Platform

2640091000001671191.20201113055034.96000607556292075557033905422838:50511207092434:2800:72DA040886606D8CEE17E248BA...
 

[B4X] [B4XPages] Firebase Push Example

Attachments

  • Push.zip
    7.3 KB · Views: 2,270

Subnet Scanner

Here is a simple subnet scanner. It scans the current class C subnet for a particular port number and tries to open a connection.

It logs all the IPs that are found to have that port open in a...
 

Attachments

  • Scanner Example.zip
    4.2 KB · Views: 678
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intent for beginner - messages between apps

Part 1

1- Intent is exactly a Specific Message between Android Apps.
Building this message is simple in B4A:
B4X:
dim intent1 as intent

2- Any message (ie: intent) has a specific purpose...
 

EasyDeviceInfo (with inline Java Code)

It incorporates this Github project via inline java code. The project reports a whole lot of information about your device and write the results to the B4A log:

B4X:
** Activity (main)...
 

Attachments

  • b4aEasyDeviceInfo.zip
    15.5 KB · Views: 1,265

[B4X] Like Animation - smooth and beautiful transition

This is a simple like animation.
It looks smoother and better in real.
ezgif.com-video-to-gif.gif

LikeAnimation:
Private Sub LikeAnimation(xlbl As B4XView,duration As Int)
    Dim txt_size As Float = xlbl.TextSize
    If...
 

Attachments

  • Like Animation.zip
    9.8 KB · Views: 729
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