Flutter

In the first part of this series, you learned how to create a basic app in Flutter. There you learned only basic structure, some interactivity and you used only Stateless widgets. In this tutorial, you will develop an Expense App to learn state, stateful widget, regular expression, TextField widget, and some concepts in Flutter.

I tried my best to add minimal features so you could easily understand the building blocks for this app.

You will develop the following app with me:

Programming

Web scraping is the process of gathering data automatically by a computer program from different websites. There are many use cases. Many businesses created solely based on web scarping.

There are different ways to scrape any website using Python. Using the BeautifulSoup library, Scrapy Framework, and Selenium library with a headless web browser.

Using BeautifulSoup or Scrapy Framework, we can easily scrap a normal website where the server generates the HTML files. …

Android Dev

In my last article, I discussed how to reverse engineering an android app. If you did no reverse engineering before just do it to learn how easy it is to reverse an android app to the original source code.

In this article, I will let you know how to protect an Android app from reverse engineering.

If you want to protect your app from reverse engineering free, unfortunately, there is no such tool. What you can do is to make it difficult for the attacker.

There is a detailed article from android developer website where you can know how to do it. You just have to update your project-level build.gradle file. …

Flutter

Whether you develop a native app or hybrid app, state management is a common issue to address. To manage a global state in a flutter app, Provider is one of the most popular libraries.

Sometimes it is critical to know when the local state value changed in a SwiftUI view. In one of my applications, I had a text field, and I had to enable the next button if the user inputs something. I also used the local state variable for the purpose.

For demonstration purposes, I just want to show a green text “Green” below the text field when the user enters something.

I never took content creation as my full-time profession. I am a computer programmer and loves to build software. Two years back in 2018, I started a YouTube channel to publish programming tutorials initially in Bangla language and later in English.

After a few months, I combined my short video tutorials, created a few programming courses, and published them on Udemy.

In September 2020, I become a Medium partner and started monetization for my written tutorials.

Today I want to share with you among Youtube, Udemy, or Medium which platform gives me more money as an occasional programming tutorials content creator. …

Swift

Let’s iterate a String to get the index and character of each position. Normally in other programming languages like JavaScript or C++, we write code like this:

JavaScript

C++

Output:

0 C
1 o
2 d
3 e

This is a common pattern in many programming languages. The pattern is, you have to count the total number of characters in a string, and using a loop and a variable starting from 0, access all those characters.

If you follow the same pattern in Swift:

You will see the following error:

error: 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index …

I am an iOS apps developer for over 10 years. My last iPhone was the iPhone 6 and then I moved to Android devices. I used different android devices and my last one was Samsung Galaxy S10 which died within one and a half years.

Recently I bought the iPhone 12 Pro, and I am really loving my new device. If you say, which feature I like most?

It’s the camera for creating photos and videos.

Well, photography is my hobby. I have been taking photographs since 2009 and I used some heavy weighted DSLRs and mirrorless camera before. I used Canon 5D Mark II, III, Fuji X-T2, Panasonic Lumix G9, Canon G7X II, and now when I travel I use Sony a6600 with 16–55 f/2.8 …