有了上章【Xamarin+Prism开发详解六：DependencyService与IPlatformInitializer的关系】的基础，现在来理解Plugin开发就简单了。

本文实例代码地址：https://github.com/NewBLife/XamarinDemo/tree/master/Speecher

简介

Plugin其实就是各类相对独立的功能提取出来的Package，一般都不引用Xamarin相关类库，比如上章的Text To Speech功能（Github库地址https://github.com/jamesmontemagno/TextToSpeechPlugin）：

xamarin的Plugin有一个专门的统计库【xamarin/XamarinComponents】，目前统计结果如下:

Name Description NuGet Docs & Source Creator
Battery Status Gather battery level, charging status, and type. NuGet GitHub @JamesMontemagno
Barcode Scanner Scan and create barcodes with ZXing.NET.Mobile. NuGet GitHub @Redth
Bluetooth LE Scan and connect to Bluetooth devices. NuGet GitHub @allanritchie911
Calendar Query and modify device calendars NuGet GitHub Caleb Clarke
Compass Access device compass heading. NuGet GitHub @cbartonnh & @JamesMontemagno
Connectivity Get network connectivity info such as type and if connection is available. NuGet GitHub @JamesMontemagno
Cryptography PCL Crypto provides a consistent, portable set of crypto APIs. NuGet GitHub @aarnott
Device Info Properties about device such as OS, Model, and Id. NuGet GitHub @JamesMontemagno
Device Motion Provides access to Accelerometer, Gyroscope, Magnetometer, and Compass. NuGet GitHub @rdelrosario
Embedded Resource Unpack embedded resource cross-platform. NuGet GitHub @JosephHill
External Maps Launch external maps from Lat/Long or Address. NuGet GitHub @JamesMontemagno
File Storage/File System PCL Storage offers cross platform storage APIs. NuGet GitHub @dsplaisted
File Picker Pick and save files. NuGet GitHub @studyxnet
Fingerprint Access Fingerprint sensor on iOS, Android, and Windows. NuGet GitHub @smstuebe
FFImageLoading Image loading with caching, placeholders, transformations and more NuGet GitHub @molinch, @daniel-luberda
Geofencing Monitor regions when user enters/exits. NuGet GitHub @allanritchie911
Geolocator Easily detect GPS location of device. NuGet GitHub @JamesMontemagno
iBeacon & Estimote Range and monitor Bluetooth beacons. NuGet GitHub @allanritchie911
Lamp Access to LED NuGet GitHub @kphillpotts
Local Notifications Show local notifications NuGet GitHub @EdSnider, @JamesMontemagno
Manage Sleep Manage auto sleep/auto lock. NuGet GitHub @molinch0
Media Take or pick photos and videos. NuGet GitHub @JamesMontemagno
Media Manager Playback for Audio. NuGet GitHub @mhvdijk
Messaging Make phone call, send sms, and send e-mail NuGet GitHub @cjlotz
Microsoft Band Connect and communicate with the Microsoft Band from shared code! NuGet GitHub @mattleibow
Mono.Data.Sqlite Add Mono.Data.Sqlite to any Xamarin or Windows .NET app. NuGet GitHub @mattleibow
Permissions Easily check and request runtime permissions. NuGet GitHub @JamesMontemagno
Persistent key-value store Akavache is an asynchronous, persistent (i.e. writes to disk) key-value store. NuGet GitHub @paulcbetts
Portable Razor Lightweight implemenation of ASP.NET MVC APIs for mobile. NuGet GitHub @JosephHill
Push Notifications Cross platform iOS and Android Push Notifications. NuGet GitHub @rdelrosario
Secure Storage Provides secure storage for key value pairs Data NuGet GitHub @sameerIOTApps
Settings Simple & Consistent cross platform settings API. NuGet GitHub @JamesMontemagno
Share Easily share text, links, or open a browser. NuGet GitHub @JamesMontemagno & @Jakob Gürtl
Sockets TCP & UDP Listeners and Clients + UDP multicast. NuGet GitHub @rdavis_au
Speech Recognition Speech to Text. NuGet GitHub @allanritchie911
Text To Speech Talk back text from shared code. NuGet GitHub @JamesMontemagno
Toast A simple way of showing toast/pop-up notifications. NuGet GitHub @AdamPed & @EgorBo
User Dialogs Message box style dialogs. NuGet GitHub @allanritchie911
Version Tracking Track which versions of your app a user has previously installed. NuGet GitHub @ColbyLWilliams
Vibrate Vibrate any device. NuGet GitHub @JamesMontemagno

开发实践

Xamarin为Plugin开发提供了一个Visual Studio模板，通过它你可以快速开发各类Plugin。

1、安装Plugin for Xamarin Templates

2、从Plugin for Xamarin模板新建项目

整体项目结构：

通过模板创建的项目包含三类工程文件：

  • Plugin.功能名（PCL）：懒汉式实例创建文件，生成Plugin.功能名.dll。（共享类文件）
  • Plugin.功能名.Abstractions(PCL)：接口和Enums的定义，生成Plugin.功能名.Abstractions.dll。
  • Plugin.功能名.平台名（n个）：接口实现，生成Plugin.功能名.dll。

3、添加接口

namespace Plugin.Speecher.Abstractions

{

    /// <summary>

    /// Interface for Speecher

    /// </summary>

    public interface ISpeecher

    {

        void Speak(string text);

    }

}

4、各个平台接口实现

iOS平台

using AVFoundation;

using Plugin.Speecher.Abstractions;

namespace Plugin.Speecher

{

    /// <summary>

    /// Implementation for Speecher

    /// </summary>

    public class SpeecherImplementation : ISpeecher

    {

        public void Speak(string text)

        {

            var speechSynthesizer = new AVSpeechSynthesizer();

            var speechUtterance = new AVSpeechUtterance(text)

            {

                Rate = AVSpeechUtterance.MaximumSpeechRate / ,

                Voice = AVSpeechSynthesisVoice.FromLanguage("en-US"),

                Volume = 0.5f,

                PitchMultiplier = 1.0f

            };

            speechSynthesizer.SpeakUtterance(speechUtterance);

        }

    }

}

Android平台（由于没有Xamarin.Forms,所以这里使用Application.Context）

using Android.App;

using Android.Runtime;

using Android.Speech.Tts;

using Plugin.Speecher.Abstractions;

using System.Collections.Generic;

namespace Plugin.Speecher

{

    /// <summary>

    /// Implementation for Feature

    /// </summary>

    public class SpeecherImplementation : Java.Lang.Object, ISpeecher, TextToSpeech.IOnInitListener

    {

        TextToSpeech speaker;

        string toSpeak;

        public SpeecherImplementation() { }

        public void Speak(string text)

        {

            var ctx = Application.Context;

            toSpeak = text;

            if (speaker == null)

            {

                speaker = new TextToSpeech(ctx, this);

            }

            else

            {

                var p = new Dictionary<string, string>();

                speaker.Speak(toSpeak, QueueMode.Flush, p);

            }

        }

        public void OnInit([GeneratedEnum] OperationResult status)

        {

            if (status.Equals(OperationResult.Success))

            {

                var p = new Dictionary<string, string>();

                speaker.Speak(toSpeak, QueueMode.Flush, p);

            }

            else

            {

                System.Diagnostics.Debug.WriteLine("was quiet");

            }

        }

    }

}

UWP平台

using Plugin.Speecher.Abstractions;

using System;

using Windows.Media.SpeechSynthesis;

using Windows.UI.Xaml.Controls;

namespace Plugin.Speecher

{

    /// <summary>

    /// Implementation for Feature

    /// </summary>

    public class SpeecherImplementation : ISpeecher

    {

        public async void Speak(string text)

        {

            MediaElement mediaElement = new MediaElement();

            var synth = new SpeechSynthesizer();

            var stream = await synth.SynthesizeTextToStreamAsync(text);

            mediaElement.SetSource(stream, stream.ContentType);

            mediaElement.Play();

        }

    }

}

备注

如果确定一直使用Prism做开发的话，只需要定义接口与接口的实现就可以了。然后在实际项目各个平台的RegisterTypes方法中注册接口到IOC容器，

public void RegisterTypes(IUnityContainer container)
{
    container.RegisterType<ISpeecher, SpeecherImplementation>();
}

使用IOC容器管理对象生存周期，比懒汉式加载更加自由方便。比如在Prism.Forms中只需构造函数添加接口作为参数就可以自动创建对象。

打包并测试

在安装Plugin for Xamarin Templates的时候其实已经安装了另外一个打包用的模板【Plugin for Xamarin NuSpec】，通过它可以快速打包。

1、添加Package配置文件【Speecher.Plugin.nuspec】

默认生成的文件如下，包含所有平台：

<?xml version="1.0" encoding="utf-8"?>

<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">

    <metadata minClientVersion="2.8.3">

        <id>Plugin.Speecher</id>

        <version>1.0.</version>

        <title>Speecher Plugin for Xamarin and Windows</title>

        <authors>Your Name</authors>

        <owners>Your Name</owners>

        <licenseUrl/>

        <projectUrl/>

        <!--Default Icon, a template can be found:  https://raw.githubusercontent.com/jamesmontemagno/Xamarin-Templates/master/Plugins-Templates/icons/plugin_icon.png-->

        <iconUrl>https://raw.githubusercontent.com/jamesmontemagno/Xamarin-Templates/master/Plugins-Templates/icons/plugin_icon_nuget.png</iconUrl>

        <requireLicenseAcceptance>false</requireLicenseAcceptance>

        <description>

         Long description for your plugin.

        </description>

        <summary>Short description for your plugin.</summary>

        <tags>xamarin, pcl, xam.pcl, plugin, plugin for xamarin, windows phone, winphone, wp8, winrt, android, xamarin.forms, ios</tags>

        <dependencies>

            <group targetFramework="net">

            </group>

            <group targetFramework="win">

            </group>

            <group targetFramework="wp">

            </group>

            <group targetFramework="wpa">

            </group>

            <group targetFramework="MonoAndroid">

            </group>

            <group targetFramework="Xamarin.iOS10">

            </group>

            <group targetFramework="Xamarin.Mac20">

            </group>

            <group targetFramework="portable-net45+win+wpa81+wp80">

            </group>

            <group targetFramework="uap">

            </group>

            <group targetFramework="dotnet">

            </group>

        </dependencies>

    </metadata>

    <files>

        <!--Core-->

        <file src="Speecher\Plugin.Speecher\bin\Release\Plugin.Speecher.dll" target="lib\portable-net45+wp8+wpa81+win8+MonoAndroid10+MonoTouch10+Xamarin.iOS10+UAP10\Plugin.Speecher.dll" />

        <file src="Speecher\Plugin.Speecher\bin\Release\Plugin.Speecher.xml" target="lib\portable-net45+wp8+wpa81+win8+MonoAndroid10+MonoTouch10+Xamarin.iOS10+UAP10\Plugin.Speecher.xml" />

        <file src="Speecher\Plugin.Speecher\bin\Release\Plugin.Speecher.pdb" target="lib\portable-net45+wp8+wpa81+win8+MonoAndroid10+MonoTouch10+Xamarin.iOS10+UAP10\Plugin.Speecher.pdb" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.dll" target="lib\portable-net45+wp8+wpa81+win8+MonoAndroid10+MonoTouch10+Xamarin.iOS10+UAP10\Plugin.Speecher.Abstractions.dll" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.xml" target="lib\portable-net45+wp8+wpa81+win8+MonoAndroid10+MonoTouch10+Xamarin.iOS10+UAP10\Plugin.Speecher.Abstractions.xml" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.pdb" target="lib\portable-net45+wp8+wpa81+win8+MonoAndroid10+MonoTouch10+Xamarin.iOS10+UAP10\Plugin.Speecher.Abstractions.pdb" />        

        <!--dotnet-->

        <file src="Speecher\Plugin.Speecher\bin\Release\Plugin.Speecher.dll" target="lib\dotnet\Plugin.Speecher.dll" />

        <file src="Speecher\Plugin.Speecher\bin\Release\Plugin.Speecher.xml" target="lib\dotnet\Plugin.Speecher.xml" />

        <file src="Speecher\Plugin.Speecher\bin\Release\Plugin.Speecher.pdb" target="lib\dotnet\Plugin.Speecher.pdb" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.dll" target="lib\dotnet\Plugin.Speecher.Abstractions.dll" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.xml" target="lib\dotnet\Plugin.Speecher.Abstractions.xml" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.pdb" target="lib\dotnet\Plugin.Speecher.Abstractions.pdb" />

        <!--Win Phone Silverlight-->

        <file src="Speecher\Plugin.Speecher.WindowsPhone8\bin\Release\Plugin.Speecher.dll" target="lib\wp8\Plugin.Speecher.dll" />

        <file src="Speecher\Plugin.Speecher.WindowsPhone8\bin\Release\Plugin.Speecher.xml" target="lib\wp8\Plugin.Speecher.xml" />

        <file src="Speecher\Plugin.Speecher.WindowsPhone8\bin\Release\Plugin.Speecher.pdb" target="lib\wp8\Plugin.Speecher.pdb" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.dll" target="lib\wp8\Plugin.Speecher.Abstractions.dll" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.xml" target="lib\wp8\Plugin.Speecher.Abstractions.xml" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.pdb" target="lib\wp8\Plugin.Speecher.Abstractions.pdb" />

        <!--Win Phone -->

        <file src="Speecher\Plugin.Speecher.WindowsPhone81\bin\Release\Plugin.Speecher.dll" target="lib\wpa81\Plugin.Speecher.dll" />

        <file src="Speecher\Plugin.Speecher.WindowsPhone81\bin\Release\Plugin.Speecher.xml" target="lib\wpa81\Plugin.Speecher.xml" />

        <file src="Speecher\Plugin.Speecher.WindowsPhone81\bin\Release\Plugin.Speecher.pdb" target="lib\wpa81\Plugin.Speecher.pdb" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.dll" target="lib\wpa81\Plugin.Speecher.Abstractions.dll" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.xml" target="lib\wpa81\Plugin.Speecher.Abstractions.xml" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.pdb" target="lib\wpa81\Plugin.Speecher.Abstractions.pdb" />

        <!--WinStore-->

        <file src="Speecher\Plugin.Speecher.WindowsStore\bin\Release\Plugin.Speecher.dll" target="lib\win8\Plugin.Speecher.dll" />

        <file src="Speecher\Plugin.Speecher.WindowsStore\bin\Release\Plugin.Speecher.xml" target="lib\win8\Plugin.Speecher.xml" />

        <file src="Speecher\Plugin.Speecher.WindowsStore\bin\Release\Plugin.Speecher.pdb" target="lib\win8\Plugin.Speecher.pdb" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.dll" target="lib\win8\Plugin.Speecher.Abstractions.dll" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.xml" target="lib\win8\Plugin.Speecher.Abstractions.xml" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.pdb" target="lib\win8\Plugin.Speecher.Abstractions.pdb" />

        <!--Xamarin.Android-->

        <file src="Speecher\Plugin.Speecher.Android\bin\Release\Plugin.Speecher.dll" target="lib\MonoAndroid10\Plugin.Speecher.dll" />

        <file src="Speecher\Plugin.Speecher.Android\bin\Release\Plugin.Speecher.xml" target="lib\MonoAndroid10\Plugin.Speecher.xml" />

        <file src="Speecher\Plugin.Speecher.Android\bin\Release\Plugin.Speecher.pdb" target="lib\MonoAndroid10\Plugin.Speecher.pdb" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.dll" target="lib\MonoAndroid10\Plugin.Speecher.Abstractions.dll" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.xml" target="lib\MonoAndroid10\Plugin.Speecher.Abstractions.xml" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.pdb" target="lib\MonoAndroid10\Plugin.Speecher.Abstractions.pdb" />

        <!--Xamarin.iOS-->

        <file src="Speecher\Plugin.Speecher.iOS\bin\iPhone\Release\Plugin.Speecher.dll" target="lib\Xamarin.iOS10\Plugin.Speecher.dll" />

        <file src="Speecher\Plugin.Speecher.iOS\bin\iPhone\Release\Plugin.Speecher.xml" target="lib\Xamarin.iOS10\Plugin.Speecher.xml" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.dll" target="lib\Xamarin.iOS10\Plugin.Speecher.Abstractions.dll" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.xml" target="lib\Xamarin.iOS10\Plugin.Speecher.Abstractions.xml" />

        <!--uap-->

        <file src="Speecher\Plugin.Speecher.UWP\bin\Release\Plugin.Speecher.dll" target="lib\UAP10\Plugin.Speecher.dll" />

        <file src="Speecher\Plugin.Speecher.UWP\bin\Release\Plugin.Speecher.xml" target="lib\UAP10\Plugin.Speecher.xml" />

        <file src="Speecher\Plugin.Speecher.UWP\bin\Release\Plugin.Speecher.pdb" target="lib\UAP10\Plugin.Speecher.pdb" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.dll" target="lib\UAP10\Plugin.Speecher.Abstractions.dll" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.xml" target="lib\UAP10\Plugin.Speecher.Abstractions.xml" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.pdb" target="lib\UAP10\Plugin.Speecher.Abstractions.pdb" />

        <!--Xamarin.Mac

        <file src="Speecher\Plugin.Speecher.Mac\bin\iPhone\Release\Plugin.Speecher.dll" target="lib\Xamarin.Mac20\Plugin.Speecher.dll" />

        <file src="Speecher\Plugin.Speecher.Mac\bin\iPhone\Release\Plugin.Speecher.xml" target="lib\Xamarin.Mac20\Plugin.Speecher.xml" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.dll" target="lib\Xamarin.Mac20\Plugin.Speecher.Abstractions.dll" />

        <file src="Speecher\Plugin.Speecher.Abstractions\bin\Release\Plugin.Speecher.Abstractions.xml" target="lib\Xamarin.Mac20\Plugin.Speecher.Abstractions.xml" />

        -->

    </files>

</package>
  • 由于只正对iOS，Android，UWP三个平台，其他的配置都删除掉
  • 固定文件名用*代替

修改后的文件如下：

<?xml version="1.0" encoding="utf-8"?>

<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">

  <metadata minClientVersion="2.8.3">

    <id>Plugin.Speecher</id>

    <version>1.0.</version>

    <title>Speecher Plugin for Xamarin and Windows</title>

    <authors>NewBlifes</authors>

    <owners>NewBlifes</owners>

    <iconUrl>https://github.com/NewBLife/NewBlife.Core/blob/master/logo.png</iconUrl>

    <requireLicenseAcceptance>false</requireLicenseAcceptance>

    <description>

      Text to speech plugin.

    </description>

    <summary>Text to speech plugin.</summary>

    <tags>xamarin, pcl, xam.pcl, plugin, plugin for xamarin, windows phone, UWP, android, xamarin.forms, ios</tags>

    <dependencies>

      <group targetFramework="MonoAndroid">

      </group>

      <group targetFramework="Xamarin.iOS10">

      </group>

      <group targetFramework="portable-net45+win+wpa81+wp80">

      </group>

      <group targetFramework="uap">

      </group>

    </dependencies>

  </metadata>

  <files>

    <!--Core-->

    <file src="Speecher\Plugin.Speecher\bin\Release\Plugin.Speecher.*" target="lib\portable-net45+wp8+wpa81+win8+MonoAndroid10+MonoTouch10+Xamarin.iOS10+UAP10\" />

    <!--Xamarin.Android-->

    <file src="Speecher\Plugin.Speecher.Android\bin\Release\Plugin.Speecher.*" target="lib\MonoAndroid10\" />

    <!--Xamarin.iOS-->

    <file src="Speecher\Plugin.Speecher.iOS\bin\iPhone\Release\Plugin.Speecher.*" target="lib\Xamarin.iOS10\" />

    <!--uap-->

    <file src="Speecher\Plugin.Speecher.UWP\bin\Release\Plugin.Speecher.*" target="lib\UAP10\" />

  </files>

</package>

2、编译解决方案的Release版本，使用【nuget pack】命令打包

如果没有Nuget的命令行工具记得安装。

3、测试

添加本地包路径

创建测试项目，添加Package引用

测试代码

using Plugin.Speecher;

using Prism.Commands;

using Prism.Mvvm;

namespace SpeecherTest.ViewModels

{

    public class MainPageViewModel : BindableBase

    {

        private string _speakText;

        public string SpeakText

        {

            get { return _speakText; }

            set

            {

                SetProperty(ref _speakText, value);

            }

        }

        public MainPageViewModel()

        {

        }

        public DelegateCommand SpeakCommand => new DelegateCommand(

            () =>

            {

                CrossSpeecher.Current.Speak(SpeakText);

            },

            () => !string.IsNullOrEmpty(SpeakText)).ObservesProperty(() => this.SpeakText);

    }

}

总结

通过使用Plugin For xamarin模块来开发Plugin简单又快速，你只需要关注真正的逻辑就可以。

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