tranna.blogg.se - Android life cycle components

ANDROID LIFE CYCLE COMPONENTS HOW TO
ANDROID LIFE CYCLE COMPONENTS FULL
ANDROID LIFE CYCLE COMPONENTS ANDROID
ANDROID LIFE CYCLE COMPONENTS CODE

This component will improve how the app handles network connection changes. In this tutorial, you’ll create a lifecycle-aware component in an app named AwarenessFood.

ANDROID LIFE CYCLE COMPONENTS ANDROID

Jetpack’s Android Architecture Components provide tools to help implement lifecycle-aware components that react to lifecycle changes in activities or fragments.

ANDROID LIFE CYCLE COMPONENTS CODE

Note: ionViewWillLeave would also work.Android Jetpack is a collection of libraries that help developers improve their code, reduce boilerplate code and make their app work consistently across different Android versions. I’m doing this inside ionViewWillEnter to make sure it also works when coming back from Credits view.

TODO: add lifecycle events to play, pause and stop audioĮvery time Music becomes the active view, its audio must be played. In the component code, you can see the details of the goToMusicPage method: There’s nothing special in the template of this view, but take note that goToMusicPage() is the method in charge of navigating to each ambient. Some SaSS came to the rescue to make it prettier. The main view is quite simple: There’s a list of buttons to go to the different environments, with a background image and a label. To make it simple, the howler.js library is used to play the music. The Music view will play music based on the selected ambient. The Credits view is accessed through Music view, and it simply displays some data.Here’s where you’ll need to use the lifecycle events. The Music view plays the ambient music.The Home view allows you to choose the ambient.This very simple example consists of an app with three views:

ANDROID LIFE CYCLE COMPONENTS FULL

You can download the full source code from this link. That’s why I’m bringing you this funny example: An ambient music player. I’ve always though that the best way to understand something is to put it into practice. It is important to highlight that Nav Guards are executed before any other lifecycle event method. IonViewCanLeave: Fired before leaving a view, allows you to control whether the view can be left or not.

ionViewCanEnter: Fired before entering into a view, allows you to control whether the view can be accessed or not (returning true or false).

Those methods are focused on view access control (with authentication purposes). IonViewWillUnload: Fired when a view is going to be completely removed (after leaving a non-cached view).Īs a bonus track, there are two other powerful methods related to those events: nav guards. IonViewDidLeave: Fired when you leave a page, after it stops being the active one. Use it for things you need to run every time you are leaving a page (deactivate event listeners, etc.). IonViewWillLeave: Fired when you leave a page, before it stops being the active one. IonViewDidEnter: Fired when entering a page, after it becomes the active page. Use it for tasks you want to do every time you enter in the view (setting event listeners, updating a table, etc.). IonViewWillEnter: It’s fired when entering a page, before it becomes the active one. It’s a nice place for init related tasks. This event is NOT fired on entering a view that is already cached.

ionViewDidLoad: Fired only when a view is stored in memory.

Here’s a diagram that explains how they work: Ionic 2 Navigation events are quite similar to those from iOS.

ANDROID LIFE CYCLE COMPONENTS HOW TO

I’ll teach you how to use them in a hands-on code example, but first, let’s dig into the concept! You can take advantage of those events to instantiate the view, refresh content, or store data. In Ionic 2, any view added or removed from a NavController emits certain events. Ionic 2 has a similar feature: Navigation Lifecycle Event. In native apps (iOS, Android), views have a well structured lifecycle that allows you to perform actions on key points of their execution. Enrique Oriol is the CTO of a Barcelona-based startup and frequently writes about Ionic in Spanish on his blog, where this post originally appeared.