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Home > Mobile > Android Development > Android Wearable Programming
Android Wearable Programming
Android Wearable Programming

Android Wearable Programming: Expand on your Android development capabilities by building applications for Android Wear

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Profile Icon Steven F. Daniel
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Android Wearable Programming

Chapter 2. Creating Notifications

This chapter provides you with a background of essential features of Android notifications and how we can use these to send messages between a handheld device and a wearable device.

We will be taking a look at how we can use different notification methods to develop an application that shows how we can create basic and custom notifications. You will also learn how you can incorporate and make use of Android's voice capabilities to respond to notification messages that are contained within a notification.

At the end of the chapter, we will take a look at how we can use notification stacking to display multiple notification messages within a notification.

This chapter includes the following topics:

  • Introducing Android notifications
  • Creating a basic notification for wearables
  • Creating a custom notification for wearables
  • Receiving voice input within a notification
  • Receiving multiple notifications through a process called page stacking

Introducing Android notifications

Android notification is basically a way of communicating with the user. This is done by letting the user know of an upcoming appointment or of an incoming call or SMS message. The user can then decide how to respond to the option presented to him/her.

Notifications in wear are the result of events that happen on the paired smartphone, which are then mirrored on the wearable device, or contextual events like location-aware events or time, and date-based reminders. Android notification messaging works by communicating between the handheld device and wearable device over Bluetooth. When the connection has been established, the Google Play Service notification messages can be exchanged between the handheld device and the wearable. An example of a notification message that has been sent from the Android handheld device to the Android wearable can be seen in the following screenshot:

Introducing Android notifications

In the next sections, we will be taking a look at the different ways we can send...

Creating a basic notification for wearables

In this section, we will take a look at how to create a basic notification that will be displayed on our wearable device. So let's get started!

Firstly, create a new project in Android Studio by following these simple steps:

  1. Launch Android Studio, and then navigate to the File | New Project menu option.
  2. Next, enter WearNotifications for the Application name field.
  3. Then, provide the name for the Company Domain field.
  4. Next, choose Project location where you would like to save your application code:
    Creating a basic notification for wearables
  5. Finally, click on the Next button to proceed to the next step.

Specifying the form factors

Next, we will need to specify the form factors that our application will use, as will be using a single module instead of the app and wear modules as discussed previously in Chapter 1, Understanding Android Wearables and Building Your First Android Wear App.

On the following screen we will need to choose the minimum SDK version for our phone/tablet and perform the following...

Creating a custom notification for wearables

In this section, we will take a look at how we can create a custom notification message that will be entered by the user within our code example. This will be done on the paired smartwatch, with the notification being displayed on the Android wearable device.

So let's get started:

  1. First, open the activity_main.xml file, which is located in the res | layout folder structure within Project Navigator, and add the highlighted entries as shown in the following code snippet:
    <RelativeLayout    
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android...

Receiving voice input within a notification

In this section, we will be taking a look at how we can use notifications that can allow the user to respond to these by simply using their voice. Since Android wearable devices don't contain a keyboard, a user can swipe on a notification and respond to the action using their voice, or simply by choosing from a list of options presented to them, and tapping on the item right from their Android wearable device.

To receive voice input within a notification, perform the following steps:

  1. Open the MainActivity.java file from within the Project Navigator window.
  2. Modify the onCreate(Bundle savedInstanceState) method and add the following highlighted code:
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Clear all previous notifications and
        // generate new unique ids
        NotificationManagerCompat.from(this).cancelAll(...

Receiving multiple notifications through a process called page stacking

In the previous sections, we have looked at how we can use notifications to send basic and customized notifications to our Android wearable device. In the final section, we will look at how we can use our notification service to group notifications through a process called page stacking.

This process helps us to intelligently collate and bundle similar items within a single collection to provide us with easy navigation from the same app. So, let's get started:

  1. Open the MainActivity.java file from within our Project Navigator window.
  2. Modify the onCreate(Bundle savedInstanceState) method and add the following highlighted code:
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Clear all previous notifications and
        // generate new unique ids
        NotificationManagerCompat.from(this).cancelAll...

Introducing Android notifications

Android notification is basically a way of communicating with the user. This is done by letting the user know of an upcoming appointment or of an incoming call or SMS message. The user can then decide how to respond to the option presented to him/her.

Notifications in wear are the result of events that happen on the paired smartphone, which are then mirrored on the wearable device, or contextual events like location-aware events or time, and date-based reminders. Android notification messaging works by communicating between the handheld device and wearable device over Bluetooth. When the connection has been established, the Google Play Service notification messages can be exchanged between the handheld device and the wearable. An example of a notification message that has been sent from the Android handheld device to the Android wearable can be seen in the following screenshot:

In the next sections, we will be taking a look at the different ways we can send...

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Description

If you are an Android developer who wants to learn how to build applications for the Android Wear platform, then this is the book for you. This book only requires a basic knowledge of Android programming. Familiarity with development IDEs such as Android Studio, IntelliJ IDEA, or Eclipse will be helpful.

What you will learn

  • Get introduced to the Android Wear and Google Glass SDK
  • Create your own basic and custom notifications for Android Wear by using Android notifications
  • Develop custom Android wearable watch faces and debug them over Bluetooth prior to packaging
  • Deploy your application to the handheld device or the Google Play Store
  • Develop apps that have the ability to send and receive binary blobs of data from the handheld device to the wearable device
  • Create custom layouts for the Android TV platform conforming to the Android TV design principles
  • Build effective user interfaces for the Google Glass platform
  • Incorporate voice and input features into your Android wearable app

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Jul 30, 2015
Length: 224 pages
Edition : 1st
Language : English
ISBN-13 : 9781785281297
Vendor :
Google
Category :
Mobile
Languages :
Java
Concepts :
Android Development
Tools :
Android Studio

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Publication date : Jul 30, 2015
Length: 224 pages
Edition : 1st
Language : English
ISBN-13 : 9781785281297
Vendor :
Google
Category :
Mobile
Languages :
Java
Concepts :
Android Development
Tools :
Android Studio

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Table of Contents

7 Chapters
1. Understanding Android Wearables and Building Your First Android Wear App Chevron down icon Chevron up icon
1. Understanding Android Wearables and Building Your First Android Wear App
Introducing Android wearables
Understanding the Android Wear architecture
Setting up an Android development environment
Building a simple Android wearable application
Summary
2. Creating Notifications Chevron down icon Chevron up icon
2. Creating Notifications
Introducing Android notifications
Creating a basic notification for wearables
Creating a custom notification for wearables
Receiving voice input within a notification
Receiving multiple notifications through a process called page stacking
Summary
3. Creating, Debugging, and Packaging Wearable Apps Chevron down icon Chevron up icon
3. Creating, Debugging, and Packaging Wearable Apps
Creating an Android wearable watch face app
Presenting information inside the WatchFace class
Creating a custom watch face service class
Debug your Android wearable app over Bluetooth
Running apps directly on an Android Wear device
The Android wearable user interface guidelines
Packaging your Android wearable application
Summary
4. Sending and Syncing Data Chevron down icon Chevron up icon
4. Sending and Syncing Data
Creating a wearable send and receive application
Creating a UI for the mobile activity
Creating a UI for the wear activity
Establishing connections for the mobile activity
Sending messages to the Android wearable
Receiving messages using MessageAPI
Transferring image data to the Android wearable
Receiving image data using DataApi
Summary
5. Working with Google Glass Chevron down icon Chevron up icon
5. Working with Google Glass
Installing the Glass Development Kit preview
Installing the Google USB drivers for Windows
Creating and building a Google Glass application
Launching the app within Google Glass
An introduction to GDK and the Google Mirror API
The Google Glassware principle design guidelines
Summary
6. Designing and Customizing Interfaces for Android TV Chevron down icon Chevron up icon
6. Designing and Customizing Interfaces for Android TV
Creating and building an Android TV application
Customizing the Android TV user interface
The Android TV user interface design guidelines
Summary
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
(2 Ratings)
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T.M. Aug 23, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This book is densely written and presents numerous screenshots and code listings. The kinds of devices covered are watches under Android Wear, Google Glass and Android TV. Two sample applications with the Wear SDK show how to send notifications and synchronize your data between the phone and the watch. The Google Glass sample covers voice recognition, controlling the camera and displaying current location on Google Maps. Finally, there’s a demonstration of a movie selector for Android TV.You don’t have to own this devices to test the apps as emulators are available.
Amazon Verified review Amazon
Amazon Customer Sep 12, 2015
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Steven F. Daniel takes a right-out-of-the-gate approach and is very hands-on in teaching the reader how to assemble effective, powerful wearable applications, primarily for Android Wear. I found the examples to be very pragmatic and worthwhile, exploring the major APIs - the Data API, Node API, and Message API - for the Android Wear platform and how to move data between a wearable device and an associated smartwatch.It also covers working with binary data and some of the unique gains you can get by using images in your wearable app. Additional topics that get good treatment are working with Android notifications across multiple platforms. It also covers debugging of wearable apps over Bluetooth, and proper UI/UX guidelines for ensuring that the main areas of “keeping technology out of the way” remain the primary goal for your wrist-bound products.I wrote a book on Google Glass development, so I was pleased to see the chapter on Glass Development Kit development, as well as working with Android TV, to show how a simple application can have relevance and presence across multiple Android platforms and devices.It’s a great quick read that gets you started on the exciting world of wearable development!
Amazon Verified review Amazon

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About the author

Profile icon Steven F. Daniel
Steven F. Daniel
Steven F. Daniel is the CEO and founder of GENIESOFT STUDIOS, a software development company based in Melbourne, Victoria, that focuses primarily on developing games and business applications for the iOS, Android, and Mac OS X platforms. He is an experienced software engineer with more than 17 years' experience and is extremely passionate about making people employable by helping them use their existing skills in iOS, Android, and Xamarin to get the job done. He is a member of the SQL Server Special Interest Group (SQLSIG), CocoaHeads, and the Java Community. He was the co-founder and Chief Technology Officer (CTO) at SoftMpire Pty Ltd., a company focused primarily on developing business applications for the iOS and Android platforms.
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