ListViews and GridViews only do half the job of achieving true memory efficiency. You pass that to the ListView, and it’s ready to be drawn on the screen. You inflate your item layout in getView(), referencing each view with the unique ID you provided in XML to customize and add view logic. You create a row layout for the items and use that layout inside your adapter.
Imagine you’re creating a ListView with complicated custom items. How could it be better than the tried and tested ListView and GridView? The answers are in the details. However, in a RecyclerView, there are features that separate your code into maintainable components even as they enforce memory-efficient design patterns. A RecyclerView can be thought of as a combination of a ListView and a GridView. Consider the next section your mission brief.Īndroid used to use ListView or GridView classes for displaying lists. You’re about to explore the vastness of RecyclerViews, and no competent commander heads into the unknown without preparation. Paste the API key into the api_key string resource, replacing INSERT API KEY HERE: Next, copy the API key and open the strings.xml file in your project. To get a key, put your name and email address into and copy the API key that appears on the screen or in your email. To use the Astronomy Picture of the Day API, one of NASA’s most popular web services, you need an API key. It’s empty! Before adding NASA’s amazing astrophotography, you need to do some set up. Click the Run app button at the top and you’ll see this: Get the starter project using the Download Materials at the top or bottom of this tutorial and open it in Android Studio. Review our introductory tutorials for a refresher! Getting Started Prerequisite note: You’ll need Android Studio 3.0 or greater and a working knowledge of developing for Android with Kotlin before starting this tutorial. How to change the layout of RecyclerViewįor this tutorial, you’ll use the sample app Galacticon to build out a feed of astronomy photos from a public NASA API.The purpose and components of RecyclerView.In this tutorial, you’ll experience the power of RecyclerView in action and learn:
Google announced a support library to make this clean, green recycling machine backwards compatible all the way to Android Eclair (2.2), released in 2010. The result? Recycling enthusiasts and developers alike rejoiced at the release of the RecyclerView widget for Android Lollipop. Applying this concept to development, Android engineers realized recycling can also make an OS run efficiently. It’s a way to make sure we’re not buried in our own rubbish or lacking resources in the future. Darryl Bayliss wrote the original and Rod Biresch provided the original update. Update note: Kevin Moore updated this tutorial for Kotlin, Android 28 (Pie) and Android Studio 3.3.
0 kommentar(er)
