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Hero works great! except with text

You can watch the 1 minute YouTube demo on the documentation: Hero class - widgets library - Dart APIAPI docs for the Hero class from the widgets library, for the Dart programming language.Dart APIThere's also a full page that goes in-depth about the

Running Flutter Desktop on MacOS

Flutter Desktop used to be a separate experimental project, and it was moved to the flutter GitHub repository recently as it has gotten more mature. The doc says that it is easiest to run a Flutter desktop app on MacOS, but that it still

Fixing iOS distribution certificate related errors

When trying to deploy my app with Fastlane to the App Store, the commands have failed citing certificate related errors such as: error: exportArchive: No profiles for 'com.company.appname' were foundError Domain=IDEProfileLocatorErrorDomain Code=1 "No profiles for 'com.company.appname' were found"

Fixing `Could not determine java version from '11.0.5'.`

I was trying to run a Java application when I got this error: # ./gradlew run FAILURE: Build failed with an exception. * What went wrong: Could not determine java version from '11.0.5'. * Try: Run with --stacktrace option to get the stack trace. Run

Fixing `PlatformException (PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 10: , null))` when calling GoogleSignIn.signIn()

I got this issue when setting an existing project on a new machine. Based on this StackOverflow post, what I needed to do was: add my machine's Android Studio debug key to the list of whitelisted keys in Firebase's Android app.download the updated

kubernetes

Second try with Kubernetes

Last time, I got completely lost in all the different entities managed by Kubernetes. See http://blog.wafrat.com/kubernetes-is-hard/. Each entity refers to others by labels and selectors. Let's take it slow and get it right. Labels and SelectorsLabelsYou can assign labels to

kubernetes

Kubernetes is hard

It's supposed to be elegant and simplify lots of things, but right now it's just making me depressed. All this time I've been managing VMs manually. But that means I have to update Linux every once in a while, on each of them. I

ubuntu

Upgrading Ubuntu 16.4 to 18.4

Every 2 years, a new Long Term Support (LTS) version of Ubuntu is released. The latest LTS version is 18.4. The VM running this blog was running on 16.4, so it was time to upgrade. Run these 4 commands. Super easy!Most

Webapp serving guide

My goal is to streamline the deployment and serving of webapps. Why should I upgrade linux every once in a while, remember to update packages, etc? BlogYou could go for a hosted solution like Ghost's. But it's ridiculously expensive. $30/mo for the smallest

Exploring IMDB reviews in TensorFlow Datasets

Running demo colabs and watching online courses are fine, but the only way for me to really understand the details is by doing it myself. Loading the datasetLet's start by loading the dataset. First I looked at the docs at https://www.tensorflow.org/

Handling `The default version of TensorFlow in Colab will soon switch to TensorFlow 2.x.`

I started a Colab notebook from scratch and imported TensorFlow, expecting to get version 2. Somehow I get this message: The default version of TensorFlow in Colab will soon switch to TensorFlow 2.x.We recommend you upgrade now or ensure your notebook will

`flutter pub update` didn't update my packages?

pub.dev warned me that one of my packages wasn't correctly overriding a method. It even gave me a -20 points to health. line 118 col 9: 'MockCollectionReference.where' ('Query Function(dynamic, {arrayContains: dynamic, isEqualTo: dynamic, isGreaterThan: dynamic, isGreaterThanOrEqualTo: dynamic, isLessThan: dynamic, isLessThanOrEqualTo: dynamic,

Fixing iOS compile issues in Flutter

I am not an iOS developer, so CocoaPods errors are foreign to me. I'll document the common errors I get and how I fixed them for future reference. Once I tried to compile my app, and suddenly I got these errors: [!] CocoaPods could not

flutter

How to write unit tests with Firebase in Flutter

I've recently published a few packages to help write unit tests for Flutter apps that use Firebase. This includes Firestore, Firebase Storage, Firebase Authentication with Google Sign In. Quick links to the packageshttps://pub.dev/packages/cloud_firestore_mockshttps://pub.dev/packages/firebase_storage_

Publishing a library to pub.dev

Today I published my first ever library to pub.dev. Here's how it went. Creating a verified publisherI went to pub.dev and signed in. Once signed in, you can create a verified publisher. Verified publishers are based on a domain name and packages

Why is GitHub still asking my password?

I had set up my SSH key long ago in my GitHub account. Yet when I git pushed to GitHub, it still asked me for my username and password. After I double checked my key at https://github.com/settings/keys, I thought it

stream_transform functions are deprecated but none of their replacements are ready yet

stream_transform v0.0.20 was released a few days ago. It deprecates all its methods in favor of extensions. But extensions are not usable as of yet, as explained in this article: In a future release, the Dart language is adding a new

Fixing "/ios/Pods/FirebaseAuth/Firebase/Auth/Source/FIRAuth.m:25:9: 'FirebaseAuthInterop/FIRAuthInterop.h' file not found"

Today the build suddenly failed for iOS (but not Android), with this cryptic error message. It turns out Cocoapods also broke because of the Mac OS update from last month. So I had to reinstall it the same way I did for Fastlane at

Fixing "Google Api Error: validateAppMessageAppAgeTargetingDeclarationNotPresent: Age targeting for your app needs to be declared."

A new policy requires you to set the age target, or the Store may remove your app from the store. In my case it simply refused to update it. Searching the error returns this explanation at https://developer.android.com/google-play/guides/families: All

android

Fixing `Google Api Error: apkNotificationMessageKeyTargetSdkVersionTooLow`

I started receiving this error message when updating my apps to the Play Store: Google Api Error: apkNotificationMessageKeyTargetSdkVersionTooLow: Your app currently targets API level 27 and must target at least API level 28. To fix it, I upgraded the version in build.gradle from:

Fixing "Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized."

I got this error when trying to run an older app in Android Studio, although I had not changed any code nor dependency yet. A Google search reveals an announcement about the breaking change on the flutter-announce Google group from Aug 9, 2019. See

flutter

Authentication broke after updating FirebaseAuth

I had written a post on how to set up Authentication with Firebase in Flutter (see Authentication in Flutter). But Firebase auth has recently released a breaking change with v0.14. Here's how to fix it. The change is that signInWithCredential used to return

blogging

People actually read this blog?

I integrated Google Analytics as an afterthought when setting up this blog. For the first time since I started writing, I checked out the dashboard. I expected a few page views—my own. It turns out, people actually read this stuff! My reactionI honestly

flutter

Recording and playing audio in Flutter

Thanks to the hard work of package developers, it is easy to record audio in Flutter. First tryI used one of the first results from a search on pub.dev. The package is called flutter_sound. After setting the permissions in the Android and

flutter

Achieving smaller app sizes with app bundles in Flutter and Fastlane

When compiling my app with flutter build apk, I've started receiving a message telling me to use app bundles, as they would reduce my app sizes. You are building a fat APK that includes binaries for android-arm, android-arm64. If you are deploying the app