添加项目文件。

XXCpzs.Android/Assets/AboutAssets.txt

@@ -0,0 +1,19 @@
+Any raw assets you want to be deployed with your application can be placed in
+this directory (and child directories) and given a Build Action of "AndroidAsset".
+
+These files will be deployed with your package and will be accessible using Android's
+AssetManager, like this:
+
+public class ReadAsset : Activity
+{
+    protected override void OnCreate (Bundle bundle)
+    {
+        base.OnCreate (bundle);
+
+        InputStream input = Assets.Open ("my_asset.txt");
+    }
+}
+
+Additionally, some Android functions will automatically load asset files:
+
+Typeface tf = Typeface.CreateFromAsset (Context.Assets, "fonts/samplefont.ttf");

XXCpzs.Android/DownloadReceiver.cs

@@ -0,0 +1,71 @@
+using Android.App;
+using Android.Content;
+using System;
+
+namespace XXCpzs.Droid
+{
+    [BroadcastReceiver]
+
+    /// <summary>
+    /// 下载通知接收器
+    /// </summary>
+    public class DownloadReceiver : BroadcastReceiver
+    {
+        public long downloadId = 0;
+        public DownloadReceiver()
+        {
+
+        }
+        public DownloadReceiver(long downloadId)
+        {
+            this.downloadId = downloadId;
+        }
+        public override void OnReceive(Context context, Intent intent)
+        {
+            if (intent.Action == DownloadManager.ActionDownloadComplete)
+            {
+                #region 下载完成
+                DownloadManager manager = (DownloadManager)context.GetSystemService(Context.DownloadService);
+                //获取下载id,默认值-1
+                var downId = intent.GetLongExtra(DownloadManager.ExtraDownloadId, -1);
+                if (downId == downloadId)
+                {
+                    Android.Database.ICursor cursor = null;
+                    try
+                    {
+                        DownloadManager.Query query = new DownloadManager.Query();
+                        query.SetFilterById(downId);
+                        cursor = manager.InvokeQuery(query);
+                        if (cursor.MoveToFirst())
+                        {
+                            //获取文件下载路径
+                            var downloadedTo = cursor.GetString(cursor.GetColumnIndex(DownloadManager.ColumnLocalUri));
+                            //var apkUri = manager.GetUriForDownloadedFile(downId);//错误路径
+
+                            var installIntent = new Intent(Intent.ActionView);
+                            installIntent.SetDataAndType(Android.Net.Uri.Parse(downloadedTo), "application/vnd.android.package-archive");
+                            //给目标程序读改uri的权限。
+                            installIntent.AddFlags(ActivityFlags.NewTask);
+                            if (Android.OS.Build.VERSION.SdkInt > Android.OS.BuildVersionCodes.M)
+                                installIntent.AddFlags(ActivityFlags.GrantReadUriPermission);
+                            // installIntent.SetFlags(ActivityFlags.GrantReadUriPermission | ActivityFlags.NewTask);
+                            context.StartActivity(installIntent);
+
+                        }
+                        if (cursor != null)
+                            cursor.Close();
+                    }
+                    catch (Exception ex)
+                    {
+                    }
+
+                    context.UnregisterReceiver(this);
+                }
+                #endregion
+            }
+            else if (intent.Action == DownloadManager.ActionNotificationClicked)
+            {
+            }
+        }
+    }
+}

XXCpzs.Android/FileDownload.cs

@@ -0,0 +1,115 @@
+using Android.App;
+using Android.Content;
+using Android.Widget;
+using System;
+
+namespace XXCpzs.Droid
+{
+    public class FileDownload
+    {
+        #region --自动更新--
+        
+        /// <summary>
+        /// 使用DownloadManager下载安装文件
+        /// </summary>
+        /// <param name="mContext"></param>
+        /// <param name="apkAddress"></param>
+        public static void DownloadUpdateFile(Context mContext, string apkAddress)
+        {
+            var apkFileName = System.IO.Path.GetFileName(apkAddress);
+            DownloadManager.Request request = new DownloadManager.Request(Android.Net.Uri.Parse(apkAddress));
+            // request.SetAllowedNetworkTypes(DownloadNetwork.Wifi);//网络环境
+            //request.SetDestinationInExternalPublicDir("download", "update1.apk");
+            request.SetDestinationInExternalFilesDir(mContext, Android.OS.Environment.DirectoryDownloads, apkFileName);
+            request.SetNotificationVisibility(DownloadVisibility.VisibleNotifyCompleted);
+            request.SetMimeType("application/vnd.android.package-archive");
+            //设置通知信息
+            request.SetTitle(apkFileName);
+            request.SetDescription("软件更新");
+            //设置为可见和可管理
+            request.SetVisibleInDownloadsUi(true);
+            //设置为可被媒体扫描器找到
+            request.AllowScanningByMediaScanner();
+            request.SetAllowedOverRoaming(false);
+
+            //下载管理
+            DownloadManager downManager = (DownloadManager)mContext.GetSystemService(Context.DownloadService);
+            //获取此次下载的ID,返回一个唯一编号(用于识别通知来源)
+            var refrence = downManager.Enqueue(request);
+
+            // 注册广播监听系统的下载完成事件。
+            IntentFilter intentFilter = new IntentFilter(DownloadManager.ActionDownloadComplete);
+            var boradcastReceiver = new DownloadReceiver(refrence);
+            mContext.RegisterReceiver(boradcastReceiver, intentFilter);
+
+            /*备注:服务器端apk文件mime类型为application/vnd.android.package-archive
+             * 需要权限:android.permission.INTERNET和android.permission.WRITE_EXTERNAL_STORAGE
+             */
+        }
+         
+        /// <summary>
+        /// 自定义下载更新
+        /// </summary>
+        /// <param name="mContext"></param>
+        /// <param name="apkAddress"></param>
+        public void DownloadUpdateFile2(Context mContext, String apkAddress)
+        {
+            //权限检查
+            if (mContext.CheckSelfPermission(Android.Manifest.Permission.WriteExternalStorage) != Android.Content.PM.Permission.Granted)
+            {
+                MainActivity.Instance.RequestPermissions(new string[] { Android.Manifest.Permission.WriteExternalStorage }, 1001);
+                return;
+            }
+
+            Java.IO.FileOutputStream outputStream = null;
+            System.IO.Stream inputStream = null;
+            Java.Net.HttpURLConnection connection = null;
+            Java.IO.File installFile = null;
+            try
+            {
+                var url = new Java.Net.URL(apkAddress);
+                connection = (Java.Net.HttpURLConnection)url.OpenConnection();
+                connection.ConnectTimeout = 60 * 1000;//1分钟
+                connection.ReadTimeout = 60 * 10 * 1000;
+                connection.Connect();
+                if (connection.ResponseCode != Java.Net.HttpStatus.Ok)
+                {
+                    var errorMessage = connection.ResponseCode.ToString() + " " + connection.ResponseMessage;
+                    return;
+                }
+                var contentLength = connection.ContentLength;
+                inputStream = connection.InputStream;
+                var downloadFile = Android.Net.Uri.FromFile(Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads));
+                installFile = new Java.IO.File(downloadFile.Path, System.IO.Path.GetFileName(apkAddress));
+                outputStream = new Java.IO.FileOutputStream(installFile, false);//需要获取存储权限
+                byte[] data = new byte[4096];
+                long total = 0;
+                int count;
+                while ((count = inputStream.Read(data, 0, data.Length)) > 0)
+                {
+                    total += count;
+                    outputStream.Write(data, 0, count);
+                }
+            }
+            catch (Exception ex)
+            {
+                Toast.MakeText(mContext, ex.Message, ToastLength.Long).Show();
+            }
+
+            if (outputStream != null)
+                outputStream.Close();
+            if (inputStream != null)
+                inputStream.Close();
+            if (connection != null)
+                connection.Disconnect();
+
+            if (installFile != null && installFile.Exists())
+            {
+                var installIntent = new Intent(Intent.ActionView);
+                installIntent.SetDataAndType(Android.Net.Uri.FromFile(installFile), "application/vnd.android.package-archive");
+                mContext.StartActivity(installIntent);
+            }
+        }
+        #endregion
+    }
+}

XXCpzs.Android/MainActivity.cs

@@ -0,0 +1,169 @@
+using Acr.UserDialogs;
+using Android.App;
+using Android.Content;
+using Android.Content.PM;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using Plugin.CurrentActivity;
+using System;
+using Xamarin.Forms;
+using ZXing.Mobile;
+
+namespace XXCpzs.Droid
+{
+    [Activity(Label = "XXCpzs", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)] 
+    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
+    {
+        internal static Context mContext { get; private set; }
+        internal static MainActivity Instance { get; private set; }
+        protected override void OnCreate(Bundle savedInstanceState)
+        {
+            TabLayoutResource = Resource.Layout.Tabbar;
+            ToolbarResource = Resource.Layout.Toolbar; 
+            
+            //var uiOpts = SystemUiFlags.LayoutStable | SystemUiFlags.LayoutFullscreen;
+            //LayoutStable表示布局稳定，不随其他变动而变动
+            //LayoutFullscreen表示把布局拓宽到全屏幕
+            //Window.DecorView.SystemUiVisibility = (StatusBarVisibility)uiOpts;
+            //把标题栏设置为透明色
+           // Window.SetStatusBarColor(Android.Graphics.Color.Argb(0, 0, 0, 0));
+
+
+            base.OnCreate(savedInstanceState);
+            Instance = this;
+            mContext = this;
+
+            UserDialogs.Init(this);
+            Rg.Plugins.Popup.Popup.Init(this, savedInstanceState);
+
+            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
+            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
+            //初始化代码
+            CrossCurrentActivity.Current.Init(this, savedInstanceState);
+            MobileBarcodeScanner.Initialize(Application);
+            LoadApplication(new App()); 
+            DependencyService.Register<XXCpzs.Services.ITextToSpeechService, Services.TextToSpeechService>();
+        }
+        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
+        {
+            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+
+            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+        }
+
+          
+    
+
+        
+
+
+        #region --自动更新--
+
+        /// <summary>
+        /// 使用DownloadManager下载安装文件
+        /// </summary>
+        /// <param name="context"></param>
+        /// <param name="apkAddress"></param>
+        public void DownloadUpdateFile(string apkAddress)
+        {
+            var apkFileName = System.IO.Path.GetFileName(apkAddress);
+            DownloadManager.Request request = new DownloadManager.Request(Android.Net.Uri.Parse(apkAddress));
+            // request.SetAllowedNetworkTypes(DownloadNetwork.Wifi);//网络环境
+            //request.SetDestinationInExternalPublicDir("download", "update1.apk");
+            request.SetDestinationInExternalFilesDir(this, Android.OS.Environment.DirectoryDownloads, apkFileName);
+            request.SetNotificationVisibility(DownloadVisibility.VisibleNotifyCompleted);
+            request.SetMimeType("application/vnd.android.package-archive");
+            //设置通知信息
+            request.SetTitle(apkFileName);
+            request.SetDescription("软件更新");
+            //设置为可见和可管理
+            request.SetVisibleInDownloadsUi(true);
+            //设置为可被媒体扫描器找到
+            request.AllowScanningByMediaScanner();
+            request.SetAllowedOverRoaming(false);
+
+            //下载管理
+            DownloadManager downManager = (DownloadManager)this.GetSystemService(Context.DownloadService);
+            //获取此次下载的ID,返回一个唯一编号(用于识别通知来源)
+            var refrence = downManager.Enqueue(request);
+
+            // 注册广播监听系统的下载完成事件。
+            IntentFilter intentFilter = new IntentFilter(DownloadManager.ActionDownloadComplete);
+            var boradcastReceiver = new DownloadReceiver(refrence);
+            this.RegisterReceiver(boradcastReceiver, intentFilter);
+
+            /*备注:服务器端apk文件mime类型为application/vnd.android.package-archive
+             * 需要权限:android.permission.INTERNET和android.permission.WRITE_EXTERNAL_STORAGE
+             */
+        }
+
+        /// <summary>
+        /// 自定义下载更新
+        /// </summary>
+        /// <param name="context"></param>
+        /// <param name="apkAddress"></param>
+        public void DownloadUpdateFile2(Context context, String apkAddress)
+        {
+            //权限检查
+            if (context.CheckSelfPermission(Android.Manifest.Permission.WriteExternalStorage) != Android.Content.PM.Permission.Granted)
+            {
+                this.RequestPermissions(new string[] { Android.Manifest.Permission.WriteExternalStorage }, 1001);
+                return;
+            }
+
+            Java.IO.FileOutputStream outputStream = null;
+            System.IO.Stream inputStream = null;
+            Java.Net.HttpURLConnection connection = null;
+            Java.IO.File installFile = null;
+            try
+            {
+                var url = new Java.Net.URL(apkAddress);
+                connection = (Java.Net.HttpURLConnection)url.OpenConnection();
+                connection.ConnectTimeout = 60 * 1000;//1分钟
+                connection.ReadTimeout = 60 * 10 * 1000;
+                connection.Connect();
+                if (connection.ResponseCode != Java.Net.HttpStatus.Ok)
+                {
+                    var errorMessage = connection.ResponseCode.ToString() + " " + connection.ResponseMessage;
+                    return;
+                }
+                var contentLength = connection.ContentLength;
+                inputStream = connection.InputStream;
+                var downloadFile = Android.Net.Uri.FromFile(Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads));
+                installFile = new Java.IO.File(downloadFile.Path, System.IO.Path.GetFileName(apkAddress));
+                outputStream = new Java.IO.FileOutputStream(installFile, false);//需要获取存储权限
+                byte[] data = new byte[4096];
+                long total = 0;
+                int count;
+                while ((count = inputStream.Read(data, 0, data.Length)) > 0)
+                {
+                    total += count;
+                    outputStream.Write(data, 0, count);
+                }
+            }
+            catch (Exception ex)
+            {
+                Toast.MakeText(this, ex.Message, ToastLength.Long).Show();
+            }
+
+            if (outputStream != null)
+                outputStream.Close();
+            if (inputStream != null)
+                inputStream.Close();
+            if (connection != null)
+                connection.Disconnect();
+
+            if (installFile != null && installFile.Exists())
+            {
+                var installIntent = new Intent(Intent.ActionView);
+                installIntent.SetDataAndType(Android.Net.Uri.FromFile(installFile), "application/vnd.android.package-archive");
+                context.StartActivity(installIntent);
+            }
+        }
+
+
+        #endregion
+    }
+}

XXCpzs.Android/Properties/AndroidManifest.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.01" package="com.xixingwl.xxcpzs" android:installLocation="auto">
+	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
+	<application android:label="XXCpzs" android:icon="@drawable/icon"></application>
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+	<uses-permission android:name="android.permission.INTERNET" />
+	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+	<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
+</manifest>

XXCpzs.Android/Properties/AssemblyInfo.cs

@@ -0,0 +1,34 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using Android.App;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("XXCpzs.Android")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("XXCpzs.Android")]
+[assembly: AssemblyCopyright("Copyright ©  2014")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: ComVisible(false)]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
+
+// Add some common permissions, these can be removed if not needed
+[assembly: UsesPermission(Android.Manifest.Permission.Internet)]
+[assembly: UsesPermission(Android.Manifest.Permission.WriteExternalStorage)]

XXCpzs.Android/Resources/AboutResources.txt

@@ -0,0 +1,50 @@
+Images, layout descriptions, binary blobs and string dictionaries can be included 
+in your application as resource files.  Various Android APIs are designed to 
+operate on the resource IDs instead of dealing with images, strings or binary blobs 
+directly.
+
+For example, a sample Android app that contains a user interface layout (main.xml),
+an internationalization string table (strings.xml) and some icons (drawable-XXX/icon.png) 
+would keep its resources in the "Resources" directory of the application:
+
+Resources/
+    drawable-hdpi/
+        icon.png
+
+    drawable-ldpi/
+        icon.png
+
+    drawable-mdpi/
+        icon.png
+
+    layout/
+        main.xml
+
+    values/
+        strings.xml
+
+In order to get the build system to recognize Android resources, set the build action to
+"AndroidResource".  The native Android APIs do not operate directly with filenames, but 
+instead operate on resource IDs.  When you compile an Android application that uses resources, 
+the build system will package the resources for distribution and generate a class called
+"Resource" that contains the tokens for each one of the resources included. For example, 
+for the above Resources layout, this is what the Resource class would expose:
+
+public class Resource {
+    public class drawable {
+        public const int icon = 0x123;
+    }
+
+    public class layout {
+        public const int main = 0x456;
+    }
+
+    public class strings {
+        public const int first_string = 0xabc;
+        public const int second_string = 0xbcd;
+    }
+}
+
+You would then use R.drawable.icon to reference the drawable/icon.png file, or Resource.layout.main 
+to reference the layout/main.xml file, or Resource.strings.first_string to reference the first 
+string in the dictionary file values/strings.xml.

XXCpzs.Android/Resources/layout/Tabbar.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.design.widget.TabLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/sliding_tabs"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/colorPrimary"
+    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+    app:tabIndicatorColor="@android:color/white"
+    app:tabGravity="fill"
+    app:tabMode="fixed" />

XXCpzs.Android/Resources/layout/Toolbar.xml

@@ -0,0 +1,9 @@
+<android.support.v7.widget.Toolbar
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/toolbar"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/colorPrimary"
+    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+    android:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
+

XXCpzs.Android/Resources/mipmap-anydpi-v26/icon.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/launcher_background" />
+    <foreground android:drawable="@mipmap/launcher_foreground" />
+</adaptive-icon>

XXCpzs.Android/Resources/mipmap-anydpi-v26/icon_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/launcher_background" />
+    <foreground android:drawable="@mipmap/launcher_foreground" />
+</adaptive-icon>

XXCpzs.Android/Resources/values/colors.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="launcher_background">#FFFFFF</color>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>

XXCpzs.Android/Resources/values/styles.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<resources>
+
+  <style name="MainTheme" parent="MainTheme.Base">
+  </style>
+  <!-- Base theme applied no matter what API -->
+  <style name="MainTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
+    <!--If you are using revision 22.1 please use just windowNoTitle. Without android:-->
+    <item name="windowNoTitle">true</item>
+    <!--We will be using the toolbar so no need to show ActionBar-->
+    <item name="windowActionBar">false</item>
+    <!-- Set theme colors from https://aka.ms/material-colors -->
+    <!-- colorPrimary is used for the default action bar background -->
+    <item name="colorPrimary">#2196F3</item>
+    <!-- colorPrimaryDark is used for the status bar -->
+    <item name="colorPrimaryDark">#1976D2</item>
+    <!-- colorAccent is used as the default value for colorControlActivated
+         which is used to tint widgets -->
+    <item name="colorAccent">#FF4081</item>
+    <!-- You can also set colorControlNormal, colorControlActivated
+         colorControlHighlight and colorSwitchThumbNormal. -->
+    <item name="windowActionModeOverlay">true</item>
+
+    <item name="android:datePickerDialogTheme">@style/AppCompatDialogStyle</item>
+  </style>
+
+  <style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
+    <item name="colorAccent">#FF4081</item>
+  </style>
+</resources>

XXCpzs.Android/Services/CommonService.cs

@@ -0,0 +1,121 @@
+using Android.App;
+using Android.Content;
+using Android.Content.PM;
+using Android.Content.Res;
+using Android.Media;
+using Android.OS;
+using System;
+using Xamarin.Forms;
+using XXCpzs.Droid.Services;
+using XXCpzs.Services;
+
+[assembly: Dependency(typeof(CommonService))]
+namespace XXCpzs.Droid.Services
+{
+    public class CommonService : ICommonService
+    {
+        public string GetVersion()
+        {
+            string version = "1.00";
+            try
+            {
+                PackageManager packageManager = MainActivity.Instance.PackageManager;
+                // getPackageName()是你当前类的包名，0代表是获取版本信息     
+                PackageInfo packInfo = packageManager.GetPackageInfo(MainActivity.Instance.PackageName, 0);
+
+                version = packInfo.VersionName;
+            }
+            catch (PackageManager.NameNotFoundException e)
+            {
+                //  e.printStackTrace();
+            }
+            return version;
+        }
+        public void CloseApp()
+        {
+            //App.Current.Quit();
+            Process.KillProcess(Process.MyPid());
+        }
+        public void UpdateApp(string DownloadUrl)
+        {
+
+            var thread = new System.Threading.Thread(new System.Threading.ThreadStart(() =>
+            {
+
+                //更新方式1
+                FileDownload.DownloadUpdateFile(MainActivity.Instance, DownloadUrl);
+                //更新方式2
+                //DownloadUpdateFile2(context, upadtePackageAddress);
+            }))
+            {
+                IsBackground = true
+            };
+            thread.Start();
+
+        }
+        // Unique ID for our notification: 
+        static readonly int NOTIFICATION_ID = 1000;
+        static readonly string CHANNEL_ID = "location_notification";
+        internal static readonly string COUNT_KEY = "count";
+
+        // Number of times the button is tapped (starts with first tap):
+        int count = 1;
+        public void SendNotity(string title, string content)
+        {
+            // 将当前按钮按下计数值传递给下一个活动:
+            var valuesForActivity = new Bundle();
+            valuesForActivity.PutInt(COUNT_KEY, count);
+
+            //当用户单击通知时，将启动第二个活动。
+            var resultIntent = new Intent(MainActivity.mContext, typeof(MainActivity));
+
+            // 将一些值传递给 Activity
+            resultIntent.PutExtras(valuesForActivity);
+
+            // 构建跨任务导航的后堆栈:
+            var stackBuilder = TaskStackBuilder.Create(MainActivity.mContext);
+            stackBuilder.AddParentStack(Java.Lang.Class.FromType(typeof(MainActivity)));
+            stackBuilder.AddNextIntent(resultIntent); 
+            
+            var resultPendingIntent = stackBuilder.GetPendingIntent(0,  PendingIntentFlags.UpdateCurrent);
+
+            // 使用后堆栈创建PendingEntent
+            var builder = new Android.Support.V4.App.NotificationCompat.Builder(MainActivity.mContext, CHANNEL_ID)
+                          .SetAutoCancel(true) // 当用户单击通知时，从通知区域中取消通知
+                          .SetContentIntent(resultPendingIntent) // 当用户单击意图时启动此活动。
+                          .SetContentTitle("Button Clicked") // 设置标题
+                          .SetNumber(count) //在内容信息中显示计数
+                          .SetSmallIcon(Resource.Drawable.ico) // 这是要显示的图标
+                          .SetContentText($"The button has been clicked {count} times."); // 要显示的消息。
+
+            // 最后，发布通知
+            var notificationManager = Android.Support.V4.App.NotificationManagerCompat.From(MainActivity.mContext);
+            notificationManager.Notify(NOTIFICATION_ID, builder.Build());
+
+            // 增加按钮按下次数
+            count++;
+        }
+
+        void CreateNotificationChannel()
+        {
+            if (Build.VERSION.SdkInt < BuildVersionCodes.O)
+            {
+                //通知通道在API 26中是新的（不是 支持库）。不需要创建通知
+
+                //Android旧版本上的频道。
+                return;
+            }
+
+            //var name = Resources.GetString(Resource.String.channel_name);
+            //var description =MainActivity.Instance. GetString("The count from MainActivity.");
+            var channel = new NotificationChannel(CHANNEL_ID, "Local Notifications", NotificationImportance.Default)
+            {
+                Description = "The count from MainActivity."
+            };
+            var notificationManager = (NotificationManager)MainActivity.mContext. GetSystemService(Context. NotificationService);
+            notificationManager.CreateNotificationChannel(channel);
+        }
+
+
+    }
+}

XXCpzs.Android/Services/NetworkConnection.cs

@@ -0,0 +1,171 @@
+using Android.Content.PM;
+using Android.OS;
+using System;
+using Xamarin.Forms;
+using XXCpzs.Droid.Services;
+using XXCpzs.Services;
+using XXCpzs.Droid;
+using Android.Net;
+using Android.Locations;
+using Android.Content;
+using Android.Telephony;
+using Xamarin.Essentials;
+
+[assembly: Dependency(typeof(NetworkConnection))] //的作用是将该类依赖于程序集，以便在可移植平台底下实例化接口。
+
+namespace XXCpzs.Droid
+{
+    public class NetworkConnection : INetworkConnection
+    {
+        //没有网络
+        public const int NETWORKTYPE_INVALID = 0;
+        //wap网络
+        public const int NETWORKTYPE_WAP = 1;
+        //2G网络
+        public const int NETWORKTYPE_2G = 2;
+        //3G和3G以上网络，或统称为快速网络
+        public const int NETWORKTYPE_3G = 3;
+        //wifi网络
+        public const int NETWORKTYPE_WIFI = 4;
+        public bool IsConnected { get; set; }
+        //判断是否有网络连接
+        public void CheckNetworkConnection()
+        {
+            var current = Connectivity.NetworkAccess;
+
+            if (current == NetworkAccess.Internet)
+            {
+                IsConnected = true;
+            }
+            else
+            {
+                IsConnected = false;
+            } 
+        }
+        //检查启用了网络位置提供商报告
+        public bool isNetLocEnabled()
+        {
+            LocationManager locMgr = MainActivity.mContext.GetSystemService(Context.LocationService) as LocationManager;
+            return locMgr.IsProviderEnabled(LocationManager.NetworkProvider);
+        }
+        //判断是否有WIFI连接
+        public bool isWifiConnected(Context context)
+        {
+            if (context != null)
+            {
+                ConnectivityManager mConnectivityManager = (ConnectivityManager)context.GetSystemService(Context.ConnectivityService);
+                NetworkInfo mWiFiNetworkInfo = mConnectivityManager.GetNetworkInfo(ConnectivityType.Wifi);
+                //NetworkInfo mWiFiNetworkInfo = mConnectivityManager.GetNetworkInfo(ConnectivityManager.TYPE_WIFI);
+                if (mWiFiNetworkInfo != null)
+                {
+                    return mWiFiNetworkInfo.IsAvailable;
+                }
+            }
+            return false;
+        }
+        //判断Mobile网络是否可用
+        public bool isMobileConnected(Context context)
+        {
+            if (context != null)
+            {
+                ConnectivityManager mConnectivityManager = (ConnectivityManager)context.GetSystemService(Context.ConnectivityService);
+                NetworkInfo mMobileNetworkInfo = mConnectivityManager.GetNetworkInfo(ConnectivityType.Mobile);
+                //NetworkInfo mMobileNetworkInfo = mConnectivityManager.GetNetworkInfo(ConnectivityManager.TYPE_MOBILE);
+                if (mMobileNetworkInfo != null)
+                {
+                    return mMobileNetworkInfo.IsAvailable;
+                }
+            }
+            return false;
+        }
+        //检查飞行模式 - 我们要关闭飞机模式
+        //public bool confirmAirplaneModeOff(Context context)
+        //{
+            //int airplaneSetting = Settings.System.GetInt(context.ContentResolver, Settings.System.AirplaneModeOn, 0);
+            //int airplaneSetting = Settings.System.getInt(context.getContentResolver(), Settings.System.AIRPLANE_MODE_ON, 0);
+            //return airplaneSetting == 0;
+        //}
+        //确定网络位置提供程序是否真的可用
+        //  public bool isNetlocUsable(Context context)
+        // {
+           // return isNetLocEnabled(context) && confirmAirplaneModeOff(context) && isWifiConnected(context) && isMobileConnected(context);
+        // }
+        //判断是否是FastMobileNetWork，将3G或者3G以上的网络称为快速网络
+        private static bool isFastMobileNetwork(Context context)
+        {
+            TelephonyManager telephonyManager = (TelephonyManager)context.GetSystemService(Context.TelephonyService);
+            switch (telephonyManager.NetworkType)
+            {
+                case NetworkType.OneXrtt:
+                    return false; // ~ 50-100 kbps  
+                case NetworkType.Cdma:
+                    return false; // ~ 14-64 kbps  
+                case NetworkType.Edge:
+                    return false; // ~ 50-100 kbps  
+                case NetworkType.Evdo0:
+                    return true; // ~ 400-1000 kbps  
+                case NetworkType.EvdoA:
+                    return true; // ~ 600-1400 kbps  
+                case NetworkType.Gprs:
+                    return false; // ~ 100 kbps  
+                case NetworkType.Hsdpa:
+                    return true; // ~ 2-14 Mbps  
+                case NetworkType.Hspa:
+                    return true; // ~ 700-1700 kbps  
+                case NetworkType.Hsupa:
+                    return true; // ~ 1-23 Mbps  
+                case NetworkType.Umts:
+                    return true; // ~ 400-7000 kbps  
+                case NetworkType.Ehrpd:
+                    return true; // ~ 1-2 Mbps  
+                case NetworkType.EvdoB:
+                    return true; // ~ 5 Mbps  
+                case NetworkType.Hspap:
+                    return true; // ~ 10-20 Mbps  
+                case NetworkType.Iden:
+                    return false; // ~25 kbps  
+                case NetworkType.Lte:
+                    return true; // ~ 10+ Mbps  
+                case NetworkType.Unknown:
+                    return false;
+                default:
+                    return false;
+            }
+        }
+        //获取网络状态，wifi,wap,2g,3g.
+        /// <summary>
+        /// context 上下文 
+        /// return int 网络状态 {@link #NETWORKTYPE_2G},{@link #NETWORKTYPE_3G}
+        /// {@link #NETWORKTYPE_INVALID},{@link #NETWORKTYPE_WAP}* <p>{@link #NETWORKTYPE_WIFI} 
+        /// </summary>
+        public static int getNetWorkType(Context context)
+        {
+            int mNetWorkType = 0;
+            ConnectivityManager manager = (ConnectivityManager)context.GetSystemService(Context.ConnectivityService);
+            NetworkInfo networkInfo = manager.ActiveNetworkInfo;
+
+
+            if (networkInfo != null && networkInfo.IsConnected)
+            {
+                String type = networkInfo.TypeName;
+
+
+                if (type.Equals("WIFI".ToUpper()))
+                {
+                    mNetWorkType = NETWORKTYPE_WIFI;
+                }
+                else if (type.Equals("MOBILE".ToUpper()))
+                {
+                    String proxyHost = Proxy.DefaultHost;
+                    //String proxyHost = android.net.Proxy.getDefaultHost();
+                    //mNetWorkType = TextUtils.IsEmpty(proxyHost) ? (isFastMobileNetwork(context) ? NETWORKTYPE_3G : NETWORKTYPE_2G) : NETWORKTYPE_WAP;
+                }
+            }
+            else
+            {
+                mNetWorkType = NETWORKTYPE_INVALID;
+            }
+            return mNetWorkType;
+        }
+    }
+} 

XXCpzs.Android/Services/NotifyService.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+
+namespace XXCpzs.Droid.Services
+{
+    class NotifyService
+    {
+    }
+}

XXCpzs.Android/Services/TextToSpeechService.cs

@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Android.Speech.Tts;
+using XXCpzs.Services;
+
+namespace XXCpzs.Droid.Services
+{
+    public class TextToSpeechService : Java.Lang.Object, ITextToSpeechService, TextToSpeech.IOnInitListener,
+#pragma warning disable CS0618
+        TextToSpeech.IOnUtteranceCompletedListener
+#pragma warning restore CS0618
+    {
+        TextToSpeech speaker;
+        TaskCompletionSource<bool> tcsInitialize;
+        TaskCompletionSource<bool> tcsUtterance;
+
+        Task<bool> Initialize()
+        {
+            if (tcsInitialize != null)
+                return tcsInitialize.Task;
+
+            tcsInitialize = new TaskCompletionSource<bool>();
+            try
+            {
+                speaker = new TextToSpeech(MainActivity.Instance, this);
+#pragma warning disable CS0618
+                speaker.SetOnUtteranceCompletedListener(this);
+#pragma warning restore CS0618
+            }
+            catch (Exception ex)
+            {
+                tcsInitialize.TrySetException(ex);
+            }
+            return tcsInitialize.Task;
+        }
+
+        public async Task SpeakAsync(string text)
+        {
+            await Initialize();
+
+            if (tcsUtterance?.Task != null)
+                await tcsUtterance.Task;
+
+            tcsUtterance = new TaskCompletionSource<bool>();
+
+            // Set the utterance id so the completed listener fires
+            var parameters = new Dictionary<string, string>();
+            parameters.Add(TextToSpeech.Engine.KeyParamUtteranceId, new Guid().ToString());
+
+            // Use an obsolete overload so it works on older API levels
+#pragma warning disable CS0618
+            speaker.Speak(text, QueueMode.Flush, parameters);
+#pragma warning restore CS0618
+            await tcsUtterance.Task;
+        }
+
+        public void OnInit(OperationResult status)
+        {
+            if (status.Equals(OperationResult.Success))
+                tcsInitialize.TrySetResult(true);
+            else
+                tcsInitialize.TrySetException(new ArgumentException("Failed to initialize TTS engine."));
+        }
+
+        public void OnUtteranceCompleted(string utteranceId)
+        {
+            tcsUtterance.TrySetResult(true);
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                speaker?.Stop();
+                speaker?.Shutdown();
+                speaker = null;
+            }
+
+            base.Dispose(disposing);
+        }
+    }
+}

XXCpzs.Android/XXCpzs.Android.csproj

@@ -0,0 +1,171 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{C0C1A1B5-9459-42ED-96AA-632294020CFE}</ProjectGuid>
+    <ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <TemplateGuid>{9AA2D3C6-3393-45F1-8E7C-5A9901728795}</TemplateGuid>
+    <OutputType>Library</OutputType>
+    <RootNamespace>XXCpzs.Droid</RootNamespace>
+    <AssemblyName>XXCpzs.Android</AssemblyName>
+    <AndroidApplication>True</AndroidApplication>
+    <AndroidResgenFile>Resources\Resource.designer.cs</AndroidResgenFile>
+    <AndroidResgenClass>Resource</AndroidResgenClass>
+    <AndroidManifest>Properties\AndroidManifest.xml</AndroidManifest>
+    <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
+    <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
+    <AndroidUseLatestPlatformSdk>false</AndroidUseLatestPlatformSdk>
+    <TargetFrameworkVersion>v9.0</TargetFrameworkVersion>
+    <AndroidEnableSGenConcurrent>true</AndroidEnableSGenConcurrent>
+    <AndroidUseAapt2>true</AndroidUseAapt2>
+    <AndroidHttpClientHandlerType>Xamarin.Android.Net.AndroidClientHandler</AndroidHttpClientHandlerType>
+    <NuGetPackageImportStamp>
+    </NuGetPackageImportStamp>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>portable</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <AndroidLinkMode>None</AndroidLinkMode>
+    <AotAssemblies>false</AotAssemblies>
+    <EnableLLVM>false</EnableLLVM>
+    <AndroidEnableProfiledAot>true</AndroidEnableProfiledAot>
+    <BundleAssemblies>false</BundleAssemblies>
+    <AndroidUseAapt2>true</AndroidUseAapt2>
+    <AndroidUseSharedRuntime>true</AndroidUseSharedRuntime>
+    <EmbedAssembliesIntoApk>false</EmbedAssembliesIntoApk>
+    <AndroidCreatePackagePerAbi>false</AndroidCreatePackagePerAbi>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>portable</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <AndroidManagedSymbols>true</AndroidManagedSymbols>
+    <AndroidUseSharedRuntime>true</AndroidUseSharedRuntime>
+    <AotAssemblies>false</AotAssemblies>
+    <EnableLLVM>false</EnableLLVM>
+    <AndroidEnableProfiledAot>false</AndroidEnableProfiledAot>
+    <BundleAssemblies>false</BundleAssemblies>
+    <EmbedAssembliesIntoApk>false</EmbedAssembliesIntoApk>
+    <AndroidCreatePackagePerAbi>false</AndroidCreatePackagePerAbi>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Mono.Android" />
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Numerics" />
+    <Reference Include="System.Numerics.Vectors" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="4.3.0.908675" />
+    <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
+    <PackageReference Include="Xamarin.Essentials" Version="1.3.1" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="DownloadReceiver.cs" />
+    <Compile Include="FileDownload.cs" />
+    <Compile Include="MainActivity.cs" />
+    <Compile Include="Resources\Resource.designer.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Services\CommonService.cs" />
+    <Compile Include="Services\NetworkConnection.cs" />
+    <Compile Include="Services\NotifyService.cs" />
+    <Compile Include="Services\TextToSpeechService.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Resources\AboutResources.txt" />
+    <None Include="Assets\AboutAssets.txt" />
+    <None Include="Properties\AndroidManifest.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\layout\Tabbar.xml" />
+    <AndroidResource Include="Resources\layout\Toolbar.xml" />
+    <AndroidResource Include="Resources\values\styles.xml" />
+    <AndroidResource Include="Resources\values\colors.xml" />
+    <AndroidResource Include="Resources\mipmap-anydpi-v26\icon.xml" />
+    <AndroidResource Include="Resources\mipmap-anydpi-v26\icon_round.xml" />
+    <AndroidResource Include="Resources\mipmap-hdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-mdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-xhdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-xhdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-xxhdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-xxhdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\mipmap-xxxhdpi\icon.png" />
+    <AndroidResource Include="Resources\mipmap-xxxhdpi\launcher_foreground.png" />
+    <AndroidResource Include="Resources\drawable\xamarin_logo.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\XXCpzs\XXCpzs.csproj">
+      <Project>{84264E36-B135-4ECF-9C36-4E298D158A2E}</Project>
+      <Name>XXCpzs</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_cangku.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_chucang.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_customer.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_hh.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_login.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_order.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_pack.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_Quit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_Register.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_resale.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_sale.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_search.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_th.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico_weixiu.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\icon.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\loading.gif" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-hdpi\icon.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\ico.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-mdpi\icon.png" />
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
+</Project>