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Hands-On Android UI Development

You're reading from   Hands-On Android UI Development Design and develop attractive user interfaces for Android applications

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Product type Paperback
Published in Nov 2017
Publisher Packt
ISBN-13 9781788475051
Length 348 pages
Edition 1st Edition
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Author (1):
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Jason Morris Jason Morris
Author Profile Icon Jason Morris
Jason Morris
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Table of Contents (15) Chapters Close

Preface 1. Creating Android Layouts FREE CHAPTER 2. Designing Form Screens 3. Taking Actions 4. Composing User Interfaces 5. Binding Data to Widgets 6. Storing and Retrieving Data 7. Creating Overview Screens 8. Designing Material Layouts 9. Navigating Effectively 10. Making Overviews Even Better 11. Polishing Your Design 12. Customizing Widgets and Layouts 13. Activity Lifecycle
14. Test Your Knowledge Answers

Creating a ViewHolder with data binding


As you can see from building a traditional ViewHolder implementation, there is quite a lot of work and boilerplate code required just to put the data from a single item onto the screen in a layout. Further, it's actually quite expensive in its own right, because every one of the ViewHolder instances creates and holds an instance of the DateFormatter where they can easily be shared between all the ClaimItemViewHolder instances for a RecyclerView.

In cases like this, data binding can make a huge difference. Using a few tricks, you can actually create a completely generic ViewHolder implementation that will work for any data object in your application (assuming that you can bind it to a layout file). First, you'll need to create a nice generic ItemPresenter, and then modify the layout, and then you're ready to create a generic data-binding ViewHolder implementation. Follow these instructions, and you'll only ever need one ViewHolder implementation:

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