Adrian Hall

Product Architect by day; Open-source developer by night

Because Developers are Awesome - page 12

Recent posts

Testing Mobile Apps: A Primer

March 11, 2018  10 minute read  

Why should you test your mobile app? A recent study showed that almost a quarter of users only use a mobile app once, and a shocking 95% abandon an app within the first month. Some of the reasons that users abandon an app are due to content and engagement. The biggest non-content reasons for abandonment are application crashes and security concerns. No one can prevent all application crashes. The mobile ecosystem is too broad and unpredictable to provide a 100% guarantee. However, testing ens...

The Six Mobile Apps You Should Write

March 10, 2018  2 minute read  

Take a look at the mobile apps on the app stores and you will see patterns emerge. The same pattern is repeated time and time again. It’s crazy to think about this, but you only need to learn how to write six mobile apps that implement the common patterns. You can then pretty much write any app that is out there. Your First App: Notes or Task List There is a reason that just about every beginner tutorial uses the Todo app or the Notes app as the base. It’s a solid basic app that has a varie...

Creating a React Native bridge library

January 19, 2018  7 minute read  

React Native is really good at straddling the line between native and JavaScript. There is a bridge between the two that allows you to call native code from JavaScript. This is awesome for including things that require a special touch. Most React Native developers will never need to worry about the bridge because libraries exist to wrap a lot of the common native libraries that you see in Android and iOS. But what if you want to create a bridge library of your own? That’s a whole other effor...

AsyncStorage, TypeScript, and Async/await in React Native

August 21, 2017  4 minute read  

In the last few posts, I’ve been working on a Notes app in a master-detail pattern for React Native using TypeScript. This is the last post about that project. So far, I’ve: Worked out how to handle orientation changes. Worked out how to implement swipe-to-delete. Figured out the best way to use TypeScript. Integrated MobX for the Flux pattern. Fixed up the project for universal iOS apps. Finally written the Master-Detail pattern. That’s a lot of stuff. This last post is about...

Building a Master-Detail Pattern in React Native

August 16, 2017  5 minute read  

I’m in the middle of writing a simple Notes app in React Native. Thus far, I’ve: Worked out how to handle orientation changes. Worked out how to implement swipe-to-delete. Figured out the best way to use TypeScript. Integrated MobX for the Flux pattern. Fixed up the project for universal iOS apps. Now it’s time to get to the master-detail pattern itself. Master-Detail is a basic pattern that incorporates a list (the master) and a detail page. On phones (and tablets in portrait m...

Universal iOS Apps with React Native

August 14, 2017  less than 1 minute read  

This is one of those short “tip” posts. I was developing a nice React Native app and blogging about it. However, I bumped into a problem where my iOS simulator runs always appeared as if they were on an iPhone. If I ran the app on an iPad, it would still act as if it were on an iPhone. The fix for this is buried inside XCode. Open XCode and then open the .xcodeproj file, which is inside the ios folder of your project. Then click on the project name. You will see a section like this: Note...

Integrating React Native, TypeScript, and MobX

August 11, 2017  5 minute read  

In my last article, I psted about getting TypeScript working with React Native. I’m building a flexible, best-practices, Notes App in React Native. This means I need a backing store, and it has to be local for offline capabilities. React has a definite way of building data into the UI and the manipulation of that data is an architecture known as Flux. Flux isn’t a concrete implementation, however. Normally, I would use Redux as the concrete implementation. However, I have recently started wor...

Debugging React Native with TypeScript and Visual Studio Code

August 09, 2017  2 minute read  

One of the things I really miss from React Native was the support for TypeScript. TypeScript helps me immensely, but it really comes into its own with React programming as the PropTypes are specified for you (no more propTypes static). I’m also getting into MobX as a flux implementation and that uses decorators, which is native in TypeScript. There is lots to love in TypeScript. However, every single guide I saw for implementing TypeScript within React Native was flawed. Specifically, there ...

Implementing swipe-right on a React Native FlatList

August 07, 2017  6 minute read  

I’m progressing on my “master-detail” pattern for a react-native app. The actual implementation of master-detail is shockingly simple (more on that later). However, I bumped into some specific issues when I was implementing it. The first of these was covered last time – how to detect orientation changes in React Native. The next is this. How do I implement swipe-right so that I can add a swipe-to-delete function to a FlatList. Let me explain a little further. The latest edition of React Nati...

Handling orientation changes in React Native

July 26, 2017  3 minute read  

I’ve just returned to my JavaScript days and am trying to learn React Native again. One of the things I like to do is to produce a “perfect” app – one that will work on both tablet and phone in any orientation and that includes all the best practices. Things like my Notes App on Android, for example, took me off to learn content providers. React Native is no different. There are a bunch of things you just have to know. One of the things I want to do is to produce a single app that does maste...