Book Image

Android 9 Development Cookbook - Third Edition

By : Rick Boyer
Book Image

Android 9 Development Cookbook - Third Edition

By: Rick Boyer

Overview of this book

The Android OS has the largest installation base of any operating system in the world. There has never been a better time to learn Android development to write your own applications, or to make your own contributions to the open source community! With this extensively updated cookbook, you'll find solutions for working with the user interfaces, multitouch gestures, location awareness, web services, and device features such as the phone, camera, and accelerometer. You also get useful steps on packaging your app for the Android Market. Each recipe provides a clear solution and sample code you can use in your project from the outset. Whether you are writing your first app or your hundredth, this is a book that you will come back to time and time again, with its many tips and tricks on the rich features of Android Pie.
Table of Contents (24 chapters)
Title Page
Copyright and Credits
Dedication
About Packt
Contributors
Preface
Index

Using Contextual Batch Mode with RecyclerView


As discussed in the previous recipe, Contextual Mode supports two forms of use: single View mode (as demonstrated) and multiple selection (or batch) mode. Batch mode is where Contextual Mode outperforms the old-style context menu as multiple selections were not supported.

If you've ever used an email app such as Gmail or a file browser, you've probably seen Contextual Mode when selecting multiple items. Here is a screenshot from Solid Explorer, which shows an excellent implementation of Material Theme and Contextual Mode:

When we introduced RecyclerView in Chapter 2, Layouts, we discussed how many features from the old ListView were not already included in the new RecyclerView. Multiple item selection is one of the most missed features. In this recipe, we will demonstrate multiple item selection with the RecyclerView using Action Mode. 

Getting ready

We will use the RecyclerView example created in Chapter 2, Layouts as the base for this recipe. If...