Book Image

Android Application Development Cookbook - Second Edition

By : Kyle Mew
Book Image

Android Application Development Cookbook - Second Edition

By: Kyle Mew

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! This “cookbook” will make it easy for you to jump to a topic of interest and get what you need to implement the feature in your own application. If you are new to Android and learn best by “doing,” then this book will provide many topics of interest. Starting with the basics of Android development, we move on to more advanced concepts, and we’ll guide you through common tasks developers struggle to solve. The first few chapters cover the basics including Activities, Layouts, Widgets, and the Menu. From there, we cover fragments and data storage (including SQLite), device sensors, the camera, and GPS. Then we move on more advanced topics such as graphics and animation (including OpenGL), multi-threading with AsyncTask, and Internet functionality with Volley. We’ll also demonstrate Google Maps and Google Cloud Messaging (also known as Push Notifications) using the Google API Library. Finally, we’ll take a look at several online services designed especially for Android development. Take your application big-time with full Internet web services without having to become a server admin by leveraging the power of Backend as a Service (BaaS) providers.
Table of Contents (23 chapters)
Android Application Development Cookbook Second Edition
Credits
Disclaimer
About the Authors
About the Reviewer
www.PacktPub.com
Preface
Index

Monitoring phone call events


In the previous recipe, we demonstrated how to make a phone call, both with an Intent to call the default application as well as by directly dialing the number with no UI.

What if you want to be notified when the calls ends? This is where it gets a bit more complicated as you'll need to monitor the Telephony events and track the phone state. In this recipe, we'll demonstrate how to create a PhoneStateListener to read the phone state events.

Getting ready

Create a new project in Android Studio and call it PhoneStateListener. Use the default Phone & Tablet option and select Empty Activity when prompted for Activity Type.

Although it's not required, you can use the previous recipe to initiate a phone call to view the events. Otherwise, use the default dialer and/or watch the events from an incoming call. (The example code provided in the download files includes the previous recipe to make it easier to view the events.)

How to do it...

We only need a single TextView...