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Home > Mobile > Cross Platform Mobile Development > Xamarin Mobile Development for Android Cookbook
Xamarin Mobile Development for Android Cookbook
Xamarin Mobile Development for Android Cookbook

Xamarin Mobile Development for Android Cookbook: Over 80 hands-on recipes to unleash full potential for Xamarin in development and monetization of feature-packed, real-world Android apps

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Xamarin Mobile Development for Android Cookbook

Chapter 2. Showing Views and Handling Fragments

In this chapter, we will cover the following recipes:

  • Using custom views with layouts
  • Creating and using fragments
  • Preserving view and fragment state
  • Navigating between fragments
  • Fragments and the action bar
  • Animating fragment navigation
  • Animating view and object properties
  • Animating views on the UI
  • Adding a navigation drawer with fragments
  • Applying local styles and global themes

Introduction

All apps have one thing in common: they all have some sort of user interface. Whether it is a rich set of controls or just a simple notification that something happened, all apps present the user with a means to consume information or provide data.

Users desire an interface that is easy to use and beautiful to look at. Often, the simplest way to improve the interface is to add a transition between states. This provides a way to move the user from one state to another, but without a sharp and sudden change.

In order to move the user between states or allow the user to initiate such a movement, the app needs to provide a set of actions or navigation points. As navigation through the app is often not the primary function of the app, these controls should be placed within easy reach but should not obstruct the real functionality.

Animations and transitions do not change the functionality of an app, but they do make the user experience more enjoyable. Navigation is often the most...

Using custom views with layouts

One of the most important parts is the user interface, as it is the most visible part of an app. When we create apps for Android devices, sometimes we may need to create custom views.

How to do it...

Creating a new UI control involves creating a new type, inheriting either directly or indirectly from one of the View types. Here's how it's done:

  1. If we want to create more advanced button control, we must create a new type inheriting from the Button type. We also need to ensure that the namespace is user friendly as it will be used in the layout files:
    namespace XamarinCookbook.Views {
  public class TimedButton : Button {
  }
}
  2. Now we can implement the functionality that this button provides:
    public int Interval { get; set; }

private async void OnClicked(object sender, EventArgs e) {
  // disable the button for several seconds
  if (Interval > 0) {
    Enabled = false;
    await Task.Delay(Interval * 1000);
    Enabled = true;
  }
}
  3. As this control can...

Creating and using fragments

Sometimes normal layouts aren't dynamic enough or we may have to reuse sections of the UI and its related code.

Getting ready

To add fragments to our app we need to be targeting Android version 3.0 and above; for versions below that, we need to have installed the Xamarin.Android.Support.v4 package.

How to do it...

In order to make use of fragments in our apps, we need to create a new fragment type. Then, either in the layout or in the code, we can insert the fragments into their appropriate places in the UI. Let's take a look at the following steps:

  1. To make a master-detail app, we need a menu or list of items to select. For the menu fragment we are going to inherit from ListFragment, which is very similar to ListActivity, and set the ListAdapter property:
    public class MenuFragment : ListFragment {
  public override void OnStart() {
    base.OnStart();

    ListAdapter = new ArrayAdapter(
      Activity,
      Android.Resource.Layout.SimpleListItem1,
   ...

Preserving view and fragment state

It is important to save the state of a view, fragment, or activity. Each has a limited lifetime and may be stopped at any point, such as when the user closes the activity, navigates away from, or even rotates the device.

How to do it...

In order to preserve the state across certain actions, such as when the user switches between apps, we should save the state to the instance state parcel. Let's take a look at the following steps:

  1. Saving state for a view is done by inheriting from a type that implements the IParcelable interface, such as BaseSavedState:
    private class InstanceState : BaseSavedState {
  public InstanceState(IParcelable superState)
  : base(superState) {
  }

  public InstanceState(Parcel parcel)
  : base(parcel) {
    Interval = parcel.ReadInt();
  }

  public int Interval { get; set; }

  public override void WriteToParcel(
    Parcel dest, ParcelableWriteFlags flags) {
      base.WriteToParcel(dest, flags);
      dest.WriteInt(Interval...

Navigating between fragments

Fragments can be navigated through and back, like activities. Sometimes we have a layout that will be displayed when a user selects an option, and we want the back navigation to be as seamless as pressing the back button.

How to do it...

When it comes to navigation with fragments, we do not insert the fragments into the layout. Rather, we use an empty container layout. Then, at runtime, we insert the correct fragment:

  1. First, we are going to add a new layout for portrait view. Landscape will be the original two-pane layout, and the new portrait view will have the single pane, but with swapping (Resources/layout-port/Main.axml):
    <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/fragmentContainer"
  android:layout_width="match_parent"
  android:layout_height="match_parent"/>
  2. Next, we need to initialize FrameLayout by...

Introduction

All apps have one thing in common: they all have some sort of user interface. Whether it is a rich set of controls or just a simple notification that something happened, all apps present the user with a means to consume information or provide data.

Users desire an interface that is easy to use and beautiful to look at. Often, the simplest way to improve the interface is to add a transition between states. This provides a way to move the user from one state to another, but without a sharp and sudden change.

In order to move the user between states or allow the user to initiate such a movement, the app needs to provide a set of actions or navigation points. As navigation through the app is often not the primary function of the app, these controls should be placed within easy reach but should not obstruct the real functionality.

Animations and transitions do not change the functionality of an app, but they do make the user experience more enjoyable. Navigation is often the most jarring...

Using custom views with layouts

One of the most important parts is the user interface, as it is the most visible part of an app. When we create apps for Android devices, sometimes we may need to create custom views.

How to do it...

Creating a new UI control involves creating a new type, inheriting either directly or indirectly from one of the View types. Here's how it's done:

  1. If we want to create more advanced button control, we must create a new type inheriting from the Button type. We also need to ensure that the namespace is user friendly as it will be used in the layout files:

    namespace XamarinCookbook.Views {
  public class TimedButton : Button {
  }
}

  2. Now we can implement the functionality that this button provides:

    public int Interval { get; set; }

private async void OnClicked(object sender, EventArgs e) {
  // disable the button for several seconds
  if (Interval > 0) {
    Enabled = false;
    await Task.Delay(Interval * 1000);
    Enabled = true;
  }
}

  3. As this control can be created...

Creating and using fragments

Sometimes normal layouts aren't dynamic enough or we may have to reuse sections of the UI and its related code.

Getting ready

To add fragments to our app we need to be targeting Android version 3.0 and above; for versions below that, we need to have installed the Xamarin.Android.Support.v4 package.

How to do it...

In order to make use of fragments in our apps, we need to create a new fragment type. Then, either in the layout or in the code, we can insert the fragments into their appropriate places in the UI. Let's take a look at the following steps:

  1. To make a master-detail app, we need a menu or list of items to select. For the menu fragment we are going to inherit from ListFragment, which is very similar to ListActivity, and set the ListAdapter property:

    public class MenuFragment : ListFragment {
  public override void OnStart() {
    base.OnStart();

    ListAdapter = new ArrayAdapter(
      Activity,
      Android.Resource.Layout.SimpleListItem1,
      new [] {...

Preserving view and fragment state

It is important to save the state of a view, fragment, or activity. Each has a limited lifetime and may be stopped at any point, such as when the user closes the activity, navigates away from, or even rotates the device.

How to do it...

In order to preserve the state across certain actions, such as when the user switches between apps, we should save the state to the instance state parcel. Let's take a look at the following steps:

  1. Saving state for a view is done by inheriting from a type that implements the IParcelable interface, such as BaseSavedState:

    private class InstanceState : BaseSavedState {
  public InstanceState(IParcelable superState)
  : base(superState) {
  }

  public InstanceState(Parcel parcel)
  : base(parcel) {
    Interval = parcel.ReadInt();
  }

  public int Interval { get; set; }

  public override void WriteToParcel(
    Parcel dest, ParcelableWriteFlags flags) {
      base.WriteToParcel(dest, flags);
      dest.WriteInt(Interval);
  ...

Navigating between fragments

Fragments can be navigated through and back, like activities. Sometimes we have a layout that will be displayed when a user selects an option, and we want the back navigation to be as seamless as pressing the back button.

How to do it...

When it comes to navigation with fragments, we do not insert the fragments into the layout. Rather, we use an empty container layout. Then, at runtime, we insert the correct fragment:

  1. First, we are going to add a new layout for portrait view. Landscape will be the original two-pane layout, and the new portrait view will have the single pane, but with swapping (Resources/layout-port/Main.axml):

    <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/fragmentContainer"
  android:layout_width="match_parent"
  android:layout_height="match_parent"/>

  2. Next, we need to initialize FrameLayout by loading the first fragment, MenuFragment, at startup. If FrameLayout...

Fragments and the action bar

We can access the action bar from a fragment and make customizations to aid the user on a per-fragment basis. Items can be added, and you can also customize the up navigation, keeping a consistent structure with the rest of the app.

How to do it...

When a fragment is added to the activity, we can allow that fragment to add items to the action bar. This is similar to providing items from the activity. Let's take a look at the following steps:

  1. First, we want to add items to the action bar from the fragment, so we let the activity know we have a menu:

    public override void OnCreate(Bundle savedInstanceState) {
  base.OnCreate(savedInstanceState);
  SetHasOptionsMenu(true);
}

    Tip

    If the target Android version is below version 3.0, the HasOptionsMenu property is used instead of the SetHasOptionsMenu() method.

  2. We then create the menu structure in the menu resource folder:

    <menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:yourapp="http://schemas.android...
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Page 1 of 12

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Key benefits

  • Create a number of Android applications using the Xamarin Android platform
  • Extensively integrate your Android devices with other Android devices to enhance your app creation experience
  • A comprehensive guide packed with real-world scenarios and pro-level practices and techniques to help you build successful Android apps

Description

Xamarin is used by developers to write native iOS, Android, and Windows apps with native user interfaces and share code across multiple platforms not just on mobile devices, but on Windows, Mac OS X, and Linux. Developing apps with Xamarin.Android allows you to use and re-use your code and your skills on different platforms, making you more productive in any development. Although it’s not a write-once-run-anywhere framework, Xamarin provides native platform integration and optimizations. There is no middleware; Xamarin.Android talks directly to the system, taking your C# and F# code directly to the low levels. This book will provide you with the necessary knowledge and skills to be part of the mobile development era using C#. Covering a wide range of recipes such as creating a simple application and using device features effectively, it will be your companion to the complete application development cycle. Starting with installing the necessary tools, you will be guided on everything you need to develop an application ready to be deployed. You will learn the best practices for interacting with the device hardware, such as GPS, NFC, and Bluetooth. Furthermore, you will be able to manage multimedia resources such as photos and videos captured with the device camera, and so much more! By the end of this book, you will be able to create Android apps as a result of learning and implementing pro-level practices, techniques, and solutions. This book will ascertain a seamless and successful app building experience.

Who is this book for?

If you are a Xamarin developer who wants to create complete Android applications with Xamarin, then this book is ideal for you. No prior knowledge of Android development is needed, however a basic knowledge of C# and .NET would be useful.

What you will learn

  • Install and use Xamarin.Android with Xamarin Studio and Visual Studio
  • Design an app's user interface for multiple device configurations
  • Store and protect data in databases, files, and on the cloud
  • Utilize lists and collections to present data to the user
  • Communicate across the network using NFC or Bluetooth
  • Perform tasks in the background and update the user with notifications
  • Capture and play multimedia, such as video and audio, with the camera
  • Implement In-App Billing and Expansion Files and deploy to the store

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Nov 24, 2015
Length: 456 pages
Edition : 1st
Language : English
ISBN-13 : 9781784395872
Vendor :
Microsoft
Category :
Mobile
Languages :
C#
Concepts :
Cross Platform Mobile Development
Tools :
Xamarin

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR

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Product Details

Publication date : Nov 24, 2015
Length: 456 pages
Edition : 1st
Language : English
ISBN-13 : 9781784395872
Vendor :
Microsoft
Category :
Mobile
Languages :
C#
Concepts :
Cross Platform Mobile Development
Tools :
Xamarin

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Table of Contents

14 Chapters
1. Working with Xamarin.Android Chevron down icon Chevron up icon
1. Working with Xamarin.Android
Introduction
Creating Xamarin.Android projects
Creating user interface layouts
Creating an options menu
Supporting previous Android versions
Adding an action bar
Navigating with the action bar
Adding action bar action items
Creating contextual action mode menu
Creating contextual action mode menus
Sharing code with other platforms
2. Showing Views and Handling Fragments Chevron down icon Chevron up icon
2. Showing Views and Handling Fragments
Introduction
Using custom views with layouts
Creating and using fragments
Preserving view and fragment state
Navigating between fragments
Fragments and the action bar
Animating fragment navigation
Animating view and object properties
Animating views on the UI
Adding a navigation drawer with fragments
Applying local styles and global themes
3. Managing App Data Chevron down icon Chevron up icon
3. Managing App Data
Introduction
Storing data with SharedPreferences
Using files and the filesystem
Reading bundled assets and resources
Parsing, processing, and generating XML
Accessing data with ADO.NET
Accessing data with SQLite.NET
Encrypting databases with SQLCipher
Consuming content providers
Creating content providers
Backing up preferences and files to the cloud
Backing up data to the cloud
4. Presenting App Data Chevron down icon Chevron up icon
4. Presenting App Data
Introduction
Implementing a ListView
Using a SimpleAdapter
Using custom ListView items
Using a BaseAdapter with arbitrary data
Using a CursorAdapter
Optimizing the ListView
Enabling fast scrolling
Using section indexes
Integrating app searchability
5. Communicating with the Outside World Chevron down icon Chevron up icon
5. Communicating with the Outside World
Introduction
Consuming REST services with HttpClient
Obtaining a network state
Handling network state changes
Using DownloadManager
Accessing Bluetooth
Transferring data via Bluetooth
Receiving NFC events
Writing NFC tags
Transferring data via NFC
Obtaining location coordinates and addresses
6. Using Background Tasks Chevron down icon Chevron up icon
6. Using Background Tasks
Introduction
Asynchronous tasks
Starting services
Stopping services
Handling simultaneous service requests
Starting services automatically
Communicating with running services
Critical services
7. Notifying Users Chevron down icon Chevron up icon
7. Notifying Users
Introduction
Toasts
Alert dialogs
Alert fragments
Embedded alert fragments
Selection alerts
The notification builder
Ongoing notifications
Custom notification views
Push notifications
8. Interacting with Other Apps Chevron down icon Chevron up icon
8. Interacting with Other Apps
Introduction
Starting app components
Launching other apps
Obtaining data from activities
Using BroadcastReceivers
Scheduling tasks
Making phone calls
Intercepting phone calls
Sending SMS messages
Receiving SMS messages
9. Presenting Multimedia Chevron down icon Chevron up icon
9. Presenting Multimedia
Introduction
Playing audio
Playing audio in the background
Managing the audio volume
Recording an audio
Playing a video
Custom video controls
Using the camera
Creating a camera app
Handling high-resolution images
Drawing on the canvas of a View
Drawing on the canvas of a SurfaceView
10. Responding to the User Chevron down icon Chevron up icon
10. Responding to the User
Introduction
Responding to simple touches
Responding to scroll gestures
Responding to manipulation gestures
Detecting rotate gestures
Responding to custom user gestures
Listening to sensor data
Listening for sensor triggers
Discovering the environment
Detecting device shakes
11. Connecting to Wearables Chevron down icon Chevron up icon
11. Connecting to Wearables
Introduction
Introducing wearable notifications
Customizing wearable notifications
Creating wearable apps
Creating always-on wearable apps
Creating dynamic always-on wearable apps
Communicating with wearables
Building watch faces
Configuring watch faces
12. Adding In-App Billing Chevron down icon Chevron up icon
12. Adding In-App Billing
Introduction
Preparing for in-app billing
Integrating in-app billing
Listing available products
Purchasing products
Listing purchased products
Consuming purchases
13. Publishing Apps Chevron down icon Chevron up icon
13. Publishing Apps
Introduction
Protecting the content
Protecting the code
Preparing the app package
Shrinking the app package
Creating the app package
Uploading the app package
Adding preview testers
Releasing for production
Updating the app
Index Chevron down icon Chevron up icon
Index

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Rating distribution
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(1 Ratings)
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Tony UK Oct 13, 2018
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Covers lots of functionality that i probably wont use in a business app, what i could do with was better examples, the recipes are hard to find the correct code for. Not very in depth either. Best i could find though.
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Oct 2022 448 pages
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iOS 16 Programming for Beginners
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Nov 2022 686 pages
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Test-Driven iOS Development with Swift
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Apr 2022 280 pages
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About the author

Profile icon Leibowitz
Leibowitz
Matthew Leibowitz is a professional software engineer living in South Africa, and is currently working in a Xamarin development team. He has many years of professional experience as a programmer in developing systems ranging from servers, to desktops, to mobile devices. He has a passion for programming and has recently been awarded Xamarin Certified Mobile Developer certification for his work. He has written various articles on his blog and has participated in several forums. With his experience and great passion for development, Matthew spends his days continually looking for new ways to create a better experience for users and other developers. Some of his work is seen on GitHub under the username mattleibow. In addition to his public code, Matthew is active on Twitter with the same username.
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