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Android Application Development Cookbook

Android Application Development Cookbook

By : Boyer, Mew
4.5 (6)
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Android Application Development Cookbook

Android Application Development Cookbook

4.5 (6)
By: Boyer, 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 (17 chapters)
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16
Index

Creating a Compass using sensor data and RotateAnimation


In the previous chapter, we demonstrated reading sensor data from the physical device sensors. In that recipe, we used the Light Sensor since the data from Environment Sensors generally don't require any extra processing. Although it's easy to get the magnetic field strength data, the numbers themselves don't have much meaning and certainly don't create an appealing display.

In this recipe, we'll demonstrate getting the magnetic field data along with the accelerometer data to calculate magnetic north. We'll use the SensorManager.getRotationMatrix to animate the compass while responding to the device movement. Here's a screenshot of our compass application on a physical device:

Getting ready

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

We will need an image for the compass indicator. Again, we can turn to www.Pixabay...

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