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Andrea Bizzotto 🇺🇦 Profile picture
@biz84
Mar 1, 2022 • 6 tweets • 3 min read • Read on X
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WidgetsBindingObserver is very handy for listening to changes to:

- routing events
- device orientation
- platform settings (text scale factor, brightness, locale, etc.)
- app lifecycle events

Here's how to use it to hide sensitive info when the app goes to the background. 🧵 Image
How to set it up?

- add the WidgetsBindingObserver *mixin* to one of your classes (generally a State subclass)
- register the observer inside initState (and dispose it when done) Image
Then, just override the methods for the changes you want to keep track of.

In this case, we listen to app lifecycle changes and update a "foreground" flag via setState(). Image
One useful application of this is to build a custom widget that hides sensitive user data any time the app is backgrounded.

This can be hooked up to the "builder" argument of MaterialApp. Image
That's it! You can now test this and check the logs when you background & foreground the app. Image
If you wanna learn more about WidgetsBindingObserver, the official documentation is your best friend:

api.flutter.dev/flutter/widget…

And for more Flutter tips, just follow me: @biz84

Happy coding!

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More from @biz84

Andrea Bizzotto 🇺🇦 Profile picture
Mar 20, 2023
Can GPT-4 and GPT-3.5 play Wordle? 🤔

I decided to find out! Here's what I discovered:

✅ GPT-4 understands the game and can improve on each move
❌ GPT-3.5 doesn't quite get it 😅

Want to know all the details (prompt & answers)? Then read on! 🧵 GPT-4 completed Wordle in 4 moves: - apple (XXXXO) - ember (
First of all, I've used the same prompt for both models.

I tried to be very explicit about the game rules and provided an example.

Here's what it looks like. 👇 I need your help playing Wordle. Your job is to guess an exi
Here's how things went with GPT-4.

First three guesses: Yes, I understand the rules. I will try to guess the 5-lette
Read 12 tweets
Andrea Bizzotto 🇺🇦 Profile picture
Sep 30, 2022
I know that many people out there are looking for their first tech job (Flutter or otherwise) and times are tough.

Having hired talent twice in the last year, I received many applications but very few good ones.

So here's some advice from a "hiring manager" perspective.

🧵
If you knew you had FIVE seconds to make a good impression, what would you do?

This is not a hypothetical question.

If a hiring manager has 50 applications sitting in the inbox, how would they quickly tell the good from the bad ones?

In other words, how do you stand out?
Things that go a long way:

1️⃣ competence
2️⃣ enthusiasm
3️⃣ trustworthiness

Let me elaborate on each one. 👇
Read 15 tweets
Andrea Bizzotto 🇺🇦 Profile picture
Sep 29, 2022
If your users speak another language, you’ll need to localize your Flutter app 🗺

Here’s how to setup Flutter app localizations in just 5 minutes, using code generation.

Also covered: template vs non-template files and synthetic vs non-synthetic package. 👀

🧵 Image
1️⃣ As a first step, we need to add the required packages to the pubspec.yaml file. Image
2️⃣ Create l10n.yaml at the root

✔️ arb-dir is the input folder where Flutter will look for the localized strings
✔️ output-dir is where the localizations classes will be generated
✔️ template-arb-file is the main template that contains a description for each localized message Image
Read 14 tweets
Andrea Bizzotto 🇺🇦 Profile picture
Jul 25, 2022
What's the difference between errors and exceptions in Flutter?

→ Errors are programmer mistakes. They are fatal and we should not try to recover from them
→ Exceptions are failure conditions that are out of our control. We should handle them and recover gracefully

Thread 🧵 Image
Errors are fatal and when they happen the program *cannot* recover normally.

→ we want to discover (and fix) them as early as possible in the development process
→ we should track them in production using a crash reporting solution, so that we can measure impact and severity
The most common errors we may encounter are:

- AssertionError
- TypeError
- ArgumentError
- RangeError
- UnimplementedError
- StateError

and many others.

They all *extend* the base Error class, and the full list of errors can be found here:

api.flutter.dev/flutter/dart-c…
Read 7 tweets
Andrea Bizzotto 🇺🇦 Profile picture
Jul 11, 2022
In the last few months, I've been sharing many useful Flutter tips & tricks. 💙

Here are the top 10! 👇🧵 Here's a list of my top 10 Flutter tips & tricks.
1) Rules to follow for good app architecture

2) Dart 2.17: Super Initializers

Read 12 tweets
Andrea Bizzotto 🇺🇦 Profile picture
Jun 9, 2022
Sometimes we need to write business logic inside classes that have multiple dependencies.

To do this, we can pass the dependencies as constructor arguments.

A much simpler solution is to pass `ref.read` as an argument.

Here's a thread with all the details. 🧵
Reader is just a function we can use to read a provider's value, *just once*.

And once we get the underlying value (a repository in this case), we can call methods on it.

Note: when we want to access a provider inside a widget callback, we do exactly the same thing.
An alternative way of doing this is to pass "ref" directly.

As a result, we have to call "ref.read(provider).someMethod()" inside our class methods.

Though if you only ever need to read (and not watch or listen), using Reader makes your intention more explicit.
Read 4 tweets

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