flutter Getting stack traces for published Flutter apps The tool recommended by Flutter is Sentry. I've tried it and it's perfect for me. First you check out the tutorial about it. Report errors to a serviceHow to keep track of errors that users encounter.Flutter Logo What does it look like? With Sentry, whenever an exception occurs, it'll
flutter web Setting up Sentry for Flutter Web On the official Flutter docs, they say you can run flutter build web to compile for a release, and it'll generate everything you need, including source maps. Build and release a web appHow to prepare for and release a web app.Flutter Logo However this is not the case. Also,
flutter GridView with fixed height in Flutter I wanted to convert a ListView into a GridView so that it would show more information on a large screen such as Web. My ListView code looked like this: return ListView.builder( physics: scrollable ? null : NeverScrollableScrollPhysics(), shrinkWrap: shrinkWrap, padding: EdgeInsets.only(top: 16.0), itemCount: words.length, itemBuilder: (context, index)
flutter Migrating a large Flutter project to null safety According to the guide at https://dart.dev/null-safety/migration-guide, migrating to null safety is straightforward. Let's try it on a large project. So today I switched the sdk version to 2.12 in my pubspec.yaml, and 300+ compilation errors appeared. I tried the migration tool: % dart migrate Migrating
flutter On the importance of the Flutter environment sdk version Yesterday I made a quick update to my app. All the code compiled and all the tests succeeded, so I published an update. This morning, I wake up to a half broken app. What happened? The simplified snippet was: await Firebase.initializeApp(); final instance = FirebaseFirestore.instance; final transformer = StreamTransformer.fromHandlers(
dart Working with JSON in Dart Working with JSON in Dart is relatively easy, but there are still a few caveats. Handling dynamic types There's a page dedicated to JSON in Dart at https://dart.dev/guides/json. The first way is to use dart:convert's jsonDecode(String) => dynamic. I was trying to deserialize this kind
dart Map through a list with index in Dart In Javascript, it's easy to map through a list with the value and index. In Dart, you only get the value, but not the index. One of the top results on Google for this issue is this StackOverflow post from 2 years ago: https://stackoverflow.com/questions/54898767/enumerate-or-map-through-a-list-with-index-and-value-in-dart. They
flutter Upgrading pre 1.12 Android projects based on Kotlin My old Flutter app has been complaining I need to do this migration for a while. Today I finally decided to do it. flutter/flutterFlutter makes it easy and fast to build beautiful apps for mobile and beyond. - flutter/flutterGitHubflutter Based on the criteria listed in the documentation, I
flutter My new Flutter project is stuck in assembleGradle I created a new project by running flutter create .. Then I modified the Android app's package by modifying it in: * android/app/build.gradle * android/app/src/main/AndroidManifest.xml I also integrated Firestore to it, and added an Android app there, with the new package name. Finally I ran
flutter Fixing `com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: The number of method references in a .dex file cannot exceed 64K.` in Flutter when using Firestore I created a new project, integrated Firestore to it, and on the first run, I got this error. A quick search got me to https://github.com/flutter/flutter/issues/21005. The error also shares this link: https://developer.android.com/tools/building/multidex.html. The relevant section is "Configure
ghost Setting up a self-hosted Ghost blog in 2021 A lot has changed since I set up this blog back in 2017. Now, DigitalOcean has created a way to get started much faster and with less hassle. See how I did it manually back then at http://blog.wafrat.com/setting-up-the-blog/. This blog post replaces the whole section entitled
tensorflow Use TensorBoard in Colab to track the training of a text classification model I just read Chapter 7 of Chollet's Deep learning with Python, and it introduces TensorBoard as a way to visualize metrics in real-time during training and embeddings. The goal In order to try it out, I decided to make a text classification model that predicts the category of a news
flutter web Fixing `Caught error: Unsupported operation: Platform._version` when using HttpClient in Flutter Web While porting my Flutter mobile app to Web, I ran into this exception: Caught error: Unsupported operation: Platform._version It originated from dart-sdk/lib/_http/http.dart, more precisely as soon as I instantiate dart io's HttpClient. Starting from dart io's HttpClient After reading a few StackOverflow posts, it turns
linux Resizing swap I use small Digital Ocean virtual machines, and they come with little RAM and little drive space. I originally allocated 4 GB for the swap, but now I want to reduce it to 2 GB. Initially to prevent the server from going out of RAM and randomly killing processes like
flutter web Fixing `Caught error: Unsupported operation: Platform._operatingSystem` I recently added Web support to an existing mobile Flutter app and got this error when running it in Chrome: Caught error: Unsupported operation: Platform._operatingSystem It turns out it is a known issue in Flutter Web, from July 2019: https://github.com/flutter/flutter/issues/36126. If you use
firebase Firebase in Flutter Web Firebase recently added Flutter Web support for Firestore, Firebase Auth and Firestore Storage. Here's how I set up a pre-existing Flutter + Firestore mobile app to run on Web. Feb 2022 update The latest doc to set it up is at https://firebase.google.com/docs/flutter/setup?platform=web. Now
machine learning Fixing `RuntimeError: tf.gradients is not supported when eager execution is enabled. Use tf.GradientTape instead.` I was following a code sample to visualize convnet filters from Chollet's book. And because of TensorFlow 2's API change, the original code breaks telling us to use tf.Gradient. Note that this is a work in progress. I have not managed to fix it yet. Background Originally, Chollet's piece
Fixing "Invalid `Podfile` file: no implicit conversion of nil into String." I tried running integration tests on a my project, and I got this cryptic error: % flutter drive --target=test_driver/cloud_firestore_behaviors.dart Running "flutter pub get" in cloud_firestore_mocks... 1,005ms Running pod install... 653ms CocoaPods' output: ↳ [!] Invalid `Podfile` file: no implicit conversion of nil into String.
machine learning Installing TensorFlow 2.4 and JupyterLab on Mac with M1 (outdated) This post is now outdated since Apple released TensorFlow 2.5 optimized for Macs, which is twice as fast as TensorFlow 2.4 was on my M1. See how to install it at http://blog.wafrat.com/installing-tensorflow-2-5-and-jupyter-lab/. A few weeks ago (see Getting started with ML: Colab or self-hosted
Handling customer requests as a developer Whether you're receiving requests from your product manager in a large company, or from your client as a freelancer, the process is the same. Everything is "critical"! You're rushing to complete all the features for an upcoming launch, and your client comes with new feature requests. What's more, they are
machine learning Using Kaggle datasets in Colab Here's how I got Kaggle datasets into Colab. The book I'm following referred to the Dogs vs Cats dataset. After creating an account, I went to the dataset page. Dogs vs. Cats | KaggleCreate an algorithm to distinguish dogs from catsKaggle One way would be to download it to my laptop,
python Finding the Python reference docs Since I'm a total Python beginner, I frequently need to read about its common built-in functions and idioms. Docs * https://docs.python.org/3/. Check out the Tutorial and Library Reference. * Built-in functions: https://docs.python.org/3/library/functions.html * https://docs.python.org/3/library/stdtypes.html#sequence-types-list-tuple-range
machine learning Getting started with ML: Colab or self-hosted Jupyter? The basic trade off is well-known. If you use an online VM like Google's Colab or Amazon's EC2 instances, you don't need hardware, but the cost of running the VMs will get expensive later. If you self-host, you need to buy some dedicated hardware, most likely a graphics card. TLDR:
Software development best practices This post is a list of best practices that will help junior developers become productive quickly. Style Names are incredibly important Well-named functions and variables will save you time because they make your code more readable. In turn you will produce fewer bugs. Well-written code reads like English. Once you
Work around Fatal error `Check failed: allocator->SetPermissions` This morning I tried to run a web project, and it failed with this error: Fatal error in , line 0 Check failed: allocator->SetPermissions(reinterpret_cast(region.begin()), region.size(), PageAllocator::kNoAccess). FailureMessage Object: 0x16cf24268 1: 0x102fd6218 node::NodePlatform::GetStackTracePrinter()::$_3::__invoke() [~/.nvm/versions/node/v15.5.0/bin/node]
