下载并保存 PDF 以供查看
Download and Save PDF for viewing
我正在尝试从我的应用程序下载 PDF 文档并将其显示在 IBooks 中，或者至少在下载完成后使其可供阅读。
我遵循了 Xamarin 的下载示例，它允许我下载 PDF 并将其保存在本地。它也以错误的编码保存。
这是我目前尝试过的方法。
private void PdfClickHandler()
{
var webClient = new WebClient();
webClient.DownloadStringCompleted += (s, e) => {
var text = e.Result; // get the downloaded text
string documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
string localFilename = $"{_blueways}.pdf";
// writes to local storage
File.WriteAllText(Path.Combine(documentsPath, localFilename), text);
InvokeOnMainThread(() => {
new UIAlertView("Done", "File downloaded and saved", null, "OK", null).Show();
});
};
var url = new Uri(_blueway.PDF);
webClient.Encoding = Encoding.UTF8;
webClient.DownloadStringAsync(url);
}
不要对 "binary" 数据使用 DownloadStringAsync，请使用 DownloadDataAsync:
Downloads the resource as a Byte array from the URI specified as an asynchronous operation.
private void PdfClickHandler ()
{
var webClient = new WebClient ();
webClient.DownloadDataCompleted += (s, e) => {
var data = e.Result;
string documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
string localFilename = $"{_blueways}.pdf";
File.WriteAllBytes (Path.Combine (documentsPath, localFilename), data);
InvokeOnMainThread (() => {
new UIAlertView ("Done", "File downloaded and saved", null, "OK", null).Show ();
});
};
var url = new Uri ("_blueway.PDF");
webClient.DownloadDataAsync (url);
}
这是从远程服务器下载 PCL Xamarin 文件的示例代码。
我使用了 Nuget 中提供的 PCLStorage 库包。您只需要下载并安装到您的项目中即可。
public async void Downloadfile(string Url)
{
try
{
Uri url = new Uri(Url);
var client = new HttpClient();
IFolder rootfolder = FileSystem.Current.LocalStorage;
IFolder appfolder = await rootfolder.CreateFolderAsync("Download", CreationCollisionOption.OpenIfExists);
IFolder dbfolder = await appfolder.CreateFolderAsync("foldername", CreationCollisionOption.OpenIfExists);
IFile file = await dbfolder.CreateFileAsync(strReport_name, CreationCollisionOption.ReplaceExisting);
using (var fileHandler = await file.OpenAsync(PCLStorage.FileAccess.ReadAndWrite))
{
var httpResponse = await client.GetAsync(url);
byte[] dataBuffer = await httpResponse.Content.ReadAsByteArrayAsync();
await fileHandler.WriteAsync(dataBuffer, 0, dataBuffer.Length);
}
}
catch (Exception ex)
{
throw ex;
}
}
// 检索 URL
var pdfUrl = new Uri("url.pdf"); //在此处输入您的 PDF 路径
// 使用设备浏览器打开 PDF URL 进行下载
Device.OpenUri(pdfUrl);
//首先创建模型Class文件下载
public class FileDownload
{
public string FileUrl { get; set; }
public string FileName { get; set; }
}
//在 xaml 文件中为我们需要执行下载功能的按钮创建一个视图
<ImageButton BackgroundColor="Transparent" Clicked="DownloadFile_Clicked" x:Name="ImgFileReportDownload_ViewResult" IsVisible="False">
<ImageButton.Source>
<FontImageSource Glyph=""
Color="#1CBB8C"
Size="30"
FontFamily="{StaticResource FontAwesomeSolid}">
</FontImageSource>
</ImageButton.Source>
</ImageButton>
//在xaml.cs中创建了一个方法来点击按钮下载文件
private async void DownloadFile_Clicked(object sender, EventArgs e)
{
var status = await Permissions.CheckStatusAsync<Permissions.StorageWrite>();
if (status == PermissionStatus.Granted)
{
Uri uri = new Uri(fileReportNameViewResult);
string filename = System.IO.Path.GetFileName(uri.LocalPath);
FileDownload fileDownload = new FileDownload();
fileDownload.FileName = filename;
fileDownload.FileUrl = fileReportNameViewResult;
MessagingCenter.Send<FileDownload>(fileDownload, "Download");
}
else
{
status = await Permissions.RequestAsync<Permissions.StorageWrite>();
if (status != PermissionStatus.Granted)
{
await DisplayAlert("Permission Denied!", "\nPlease go to your app settings and enable permissions.", "Ok");
return;
}
}
}
//在MainActivity.cs中，创建方法
private void MessagingCenter()
{
Xamarin.Forms.MessagingCenter.Subscribe<FileDownload>(this, "Download", (s) =>
{
NotificationID += 4;
var intent = new Intent(this, typeof(Service.DownloadManager));
intent.PutExtra("url", s.FileUrl);
intent.PutExtra("name", s.FileName);
_layout.SetMinimumHeight(3000);
_layout.Bottom = 350; ;
Snackbar.Make(_layout, "Document is Downloading.", Snackbar.LengthShort)
.Show();
StartService(intent);
});
}
//在Service文件夹中创建一个class DownloadManager.cs，复制下面所有代码并粘贴，只需更改Namespace
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace App.Droid.Service
{
[Service]
public class DownloadManager : Android.App.Service
{
AndroidNotificationManager NotificationManager = new AndroidNotificationManager();
public override IBinder OnBind(Intent intent)
{
return null;
}
public override void OnCreate()
{
}
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
Task.Run(() =>
{
int messageId = ++MainActivity.NotificationID;
string url = intent.GetStringExtra("url");
string filename = intent.GetStringExtra("name");
string extension = url.Substring(url.LastIndexOf('.'));
if (!filename.EndsWith(extension))
{
filename += extension;
}
NotificationManager.ScheduleNotification(filename, "", messageId);
String TempFileName = "";
try
{
HttpWebRequest Http = (HttpWebRequest)WebRequest.Create(url);
WebResponse Response = Http.GetResponse();
long length = Response.ContentLength;
var stream = Response.GetResponseStream();
string baseDir = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads).AbsolutePath;
//string baseDir = Android.App.Application.Context.GetExternalFilesDir(Android.OS.Environment.DirectoryDownloads).AbsolutePath;
//string baseDir = System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments);
//string baseDir = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
baseDir = Path.Combine(baseDir, filename.Substring(filename.LastIndexOf('/') + 1).Replace(' ', '_'));
Directory.CreateDirectory(baseDir);
//string filePath = Path.Combine(documentsPath, name);
if (filename.Length > 18)
{
TempFileName = filename.Substring(0, 18) + "...";
}
else
{
TempFileName = filename;
}
FileInfo fi = new FileInfo(Path.Combine(baseDir, filename.Substring(filename.LastIndexOf('/') + 1).Replace(' ', '_')));
var fis = fi.OpenWrite();
long count = 0;
int begpoint = 0;
bool iscancelled = false;
MessagingCenter.Subscribe<CancelNotificationModel>(this, "Cancel", sender =>
{
if (messageId == sender.ID)
{
iscancelled = true;
}
});
while (true)
{
try
{
if (iscancelled == true)
{
break;
}
// Read file
int bytesRead = 0;
byte[] b = new byte[1024 * 1024];
bytesRead = stream.Read(b, begpoint, b.Length);
if (bytesRead == 0)
break;
fis.Write(b, 0, bytesRead);
fis.Flush();
count += bytesRead;
System.Diagnostics.Debug.WriteLine(count + "-" + length);
if (count >= length)
break;
NotificationManager.ChangeProgress(TempFileName, (int)((count * 100) / length), messageId);
}
catch (Exception ex)
{
Http = (HttpWebRequest)WebRequest.Create(url);
WebHeaderCollection myWebHeaderCollection = Http.Headers;
Http.AddRange(count, length - 1);
Response = Http.GetResponse();
stream = Response.GetResponseStream();
}
}
fis.Close();
NotificationManager.RemoveNotification(messageId);
if (iscancelled == false)
{
new AndroidNotificationManager().DownloadCompleted(filename, "Download Completed", Path.Combine(baseDir, filename), ++messageId);
}
}
catch (Exception ex)
{
NotificationManager.RemoveNotification(messageId);
NotificationManager.FileCancelled(filename, "Download Cancelled, Please try again", ++messageId);
}
});
return StartCommandResult.NotSticky;
}
public override void OnDestroy()
{
}
}
public class CancelNotificationModel
{
public int ID { get; set; }
}
}
//在服务文件夹中创建一个class AndroidNotificationManager.cs
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using AndroidX.Core.App;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Xamarin.Essentials;
using AndroidApp = Android.App.Application;
namespace App.Droid.Service
{
public class AndroidNotificationManager
{
const string channelId = "default";
const string channelName = "Default";
const string channelDescription = "The default channel for notifications.";
const int pendingIntentId = 0;
public const string TitleKey = "title";
public const string MessageKey = "message";
bool channelInitialized = false;
NotificationManager manager;
NotificationCompat.Builder builder;
public event EventHandler NotificationReceived;
public void Initialize()
{
CreateNotificationChannel();
}
public void RemoveNotification(int messageid)
{
manager.Cancel(messageid);
}
public int ScheduleNotification(string title, string message, int messageId, bool isInfinite = false)
{
if (!channelInitialized)
{
CreateNotificationChannel();
}
Intent intent = new Intent(AndroidApp.Context, typeof(MainActivity));
intent.PutExtra(TitleKey, title);
intent.PutExtra(MessageKey, message);
PendingIntent pendingIntent = PendingIntent.GetActivity(AndroidApp.Context, pendingIntentId, intent, PendingIntentFlags.OneShot);
builder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
.SetContentTitle(title)
.SetContentText(message)
.SetPriority(NotificationCompat.PriorityLow)
.SetVibrate(new long[] { 0L })
.SetProgress(100, 0, isInfinite)
.SetSmallIcon(Resource.Drawable.checkcircle);
var notification = builder.Build();
manager.Notify(messageId, notification);
return messageId;
}
public void ChangeProgress(string filename, int progress, int messageId)
{
try
{
var actionIntent1 = new Intent();
actionIntent1.SetAction("Cancel");
actionIntent1.PutExtra("NotificationIdKey", messageId);
var pIntent1 = PendingIntent.GetBroadcast(Android.App.Application.Context, 0, actionIntent1, PendingIntentFlags.CancelCurrent);
var ProgressBuilder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
.SetSmallIcon(Resource.Drawable.checkcircle)
.SetContentTitle(filename)
.SetVibrate(new long[] { 0L })
.AddAction(Resource.Drawable.checkcircle, "Cancel", pIntent1)
.SetPriority(NotificationCompat.PriorityLow)
.SetProgress(100, progress, false)
.SetContentText(progress + "%")
.SetAutoCancel(false);
System.Diagnostics.Debug.WriteLine(progress);
manager.Notify(messageId, ProgressBuilder.Build());
}
catch
{
}
}
public void DownloadCompleted(string filenametitle, string Message, string filepath, int messageId)
{
try
{
if (!channelInitialized)
{
CreateNotificationChannel();
}
var CompletedBuilder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
.SetContentTitle(filenametitle)
.SetContentText(Message)
.SetAutoCancel(true)
.SetSmallIcon(Resource.Drawable.checkcircle);
Intent it = OpenFile(filepath, filenametitle);
if (it != null)
{
PendingIntent contentIntent =
PendingIntent.GetActivity(AndroidApp.Context,
pendingIntentId,
it,
PendingIntentFlags.OneShot
);
CompletedBuilder.SetContentIntent(contentIntent);
}
var notification = CompletedBuilder.Build();
manager.Notify(messageId, notification);
}
catch (Exception ex)
{
}
}
public void FileCancelled(string filenametitle, string Message, int messageId)
{
if (!channelInitialized)
{
CreateNotificationChannel();
}
var CompletedBuilder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
.SetContentTitle(filenametitle)
.SetContentText(Message)
.SetAutoCancel(true)
.SetSmallIcon(Resource.Drawable.checkcircle)
.SetDefaults((int)NotificationDefaults.Sound | (int)NotificationDefaults.Vibrate);
var notification = CompletedBuilder.Build();
manager.Notify(messageId, notification);
}
public void ReceiveNotification(string title, string message)
{
}
void CreateNotificationChannel()
{
manager = (NotificationManager)AndroidApp.Context.GetSystemService(AndroidApp.NotificationService);
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
var channelNameJava = new Java.Lang.String(channelName);
var channel = new NotificationChannel(channelId, channelNameJava, NotificationImportance.Low)
{
Description = channelDescription
};
manager.CreateNotificationChannel(channel);
}
channelInitialized = true;
}
public Intent OpenFile(string filePath, string fileName)
{
try
{
string application = "";
string extension = fileName.Substring(fileName.IndexOf('.'));
switch (extension.ToLower())
{
case ".doc":
case ".docx":
application = "application/msword";
break;
case ".pdf":
application = "application/pdf";
break;
case ".xls":
case ".xlsx":
application = "application/vnd.ms-excel";
break;
case ".jpg":
case ".jpeg":
case ".png":
application = "image/jpeg";
break;
case ".mp4":
application = "video/mp4";
break;
default:
application = "*/*";
break;
}
Java.IO.File file = new Java.IO.File(filePath);
bool isreadable =
file.SetReadable(true);
string ApplicationPackageName = AppInfo.PackageName;
var context = Android.App.Application.Context;
var component = new Android.Content.ComponentName(context, Java.Lang.Class.FromType(typeof(AndroidX.Core.Content.FileProvider)));
var info = context.PackageManager.GetProviderInfo(component, Android.Content.PM.PackageInfoFlags.MetaData);
var authority = info.Authority;
Android.Net.Uri uri = AndroidX.Core.Content.FileProvider.GetUriForFile(Android.App.Application.Context, authority, file);
Intent intent = new Intent(Intent.ActionView);
System.IO.File.AppendAllText((filePath + "backdebug.txt"), System.Environment.NewLine + "Point 3 uri done ");
intent.SetDataAndType(uri, application);
intent.AddFlags(ActivityFlags.GrantReadUriPermission);
intent.AddFlags(ActivityFlags.NoHistory);
intent.AddFlags(ActivityFlags.NewTask);
System.IO.File.AppendAllText((filePath + "backdebug.txt"), System.Environment.NewLine + "Point 4open file last ");
return intent;
}
catch (Exception ex)
{
Intent it = new Intent();
it.PutExtra("ex", ex.Message);
System.IO.File.AppendAllText((filePath + "backdebug.txt"), System.Environment.NewLine + "Point 4 uri done " + ex.Message);
return it;
}
}
}
}
我正在尝试从我的应用程序下载 PDF 文档并将其显示在 IBooks 中，或者至少在下载完成后使其可供阅读。
我遵循了 Xamarin 的下载示例，它允许我下载 PDF 并将其保存在本地。它也以错误的编码保存。
这是我目前尝试过的方法。
private void PdfClickHandler()
{
var webClient = new WebClient();
webClient.DownloadStringCompleted += (s, e) => {
var text = e.Result; // get the downloaded text
string documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
string localFilename = $"{_blueways}.pdf";
// writes to local storage
File.WriteAllText(Path.Combine(documentsPath, localFilename), text);
InvokeOnMainThread(() => {
new UIAlertView("Done", "File downloaded and saved", null, "OK", null).Show();
});
};
var url = new Uri(_blueway.PDF);
webClient.Encoding = Encoding.UTF8;
webClient.DownloadStringAsync(url);
}
不要对 "binary" 数据使用 DownloadStringAsync，请使用 DownloadDataAsync:
Downloads the resource as a Byte array from the URI specified as an asynchronous operation.
private void PdfClickHandler ()
{
var webClient = new WebClient ();
webClient.DownloadDataCompleted += (s, e) => {
var data = e.Result;
string documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
string localFilename = $"{_blueways}.pdf";
File.WriteAllBytes (Path.Combine (documentsPath, localFilename), data);
InvokeOnMainThread (() => {
new UIAlertView ("Done", "File downloaded and saved", null, "OK", null).Show ();
});
};
var url = new Uri ("_blueway.PDF");
webClient.DownloadDataAsync (url);
}
这是从远程服务器下载 PCL Xamarin 文件的示例代码。 我使用了 Nuget 中提供的 PCLStorage 库包。您只需要下载并安装到您的项目中即可。
public async void Downloadfile(string Url)
{
try
{
Uri url = new Uri(Url);
var client = new HttpClient();
IFolder rootfolder = FileSystem.Current.LocalStorage;
IFolder appfolder = await rootfolder.CreateFolderAsync("Download", CreationCollisionOption.OpenIfExists);
IFolder dbfolder = await appfolder.CreateFolderAsync("foldername", CreationCollisionOption.OpenIfExists);
IFile file = await dbfolder.CreateFileAsync(strReport_name, CreationCollisionOption.ReplaceExisting);
using (var fileHandler = await file.OpenAsync(PCLStorage.FileAccess.ReadAndWrite))
{
var httpResponse = await client.GetAsync(url);
byte[] dataBuffer = await httpResponse.Content.ReadAsByteArrayAsync();
await fileHandler.WriteAsync(dataBuffer, 0, dataBuffer.Length);
}
}
catch (Exception ex)
{
throw ex;
}
}
// 检索 URL
var pdfUrl = new Uri("url.pdf"); //在此处输入您的 PDF 路径
// 使用设备浏览器打开 PDF URL 进行下载
Device.OpenUri(pdfUrl);
//首先创建模型Class文件下载
public class FileDownload
{
public string FileUrl { get; set; }
public string FileName { get; set; }
}
//在 xaml 文件中为我们需要执行下载功能的按钮创建一个视图
<ImageButton BackgroundColor="Transparent" Clicked="DownloadFile_Clicked" x:Name="ImgFileReportDownload_ViewResult" IsVisible="False">
<ImageButton.Source>
<FontImageSource Glyph=""
Color="#1CBB8C"
Size="30"
FontFamily="{StaticResource FontAwesomeSolid}">
</FontImageSource>
</ImageButton.Source>
</ImageButton>
//在xaml.cs中创建了一个方法来点击按钮下载文件
private async void DownloadFile_Clicked(object sender, EventArgs e)
{
var status = await Permissions.CheckStatusAsync<Permissions.StorageWrite>();
if (status == PermissionStatus.Granted)
{
Uri uri = new Uri(fileReportNameViewResult);
string filename = System.IO.Path.GetFileName(uri.LocalPath);
FileDownload fileDownload = new FileDownload();
fileDownload.FileName = filename;
fileDownload.FileUrl = fileReportNameViewResult;
MessagingCenter.Send<FileDownload>(fileDownload, "Download");
}
else
{
status = await Permissions.RequestAsync<Permissions.StorageWrite>();
if (status != PermissionStatus.Granted)
{
await DisplayAlert("Permission Denied!", "\nPlease go to your app settings and enable permissions.", "Ok");
return;
}
}
}
//在MainActivity.cs中，创建方法
private void MessagingCenter()
{
Xamarin.Forms.MessagingCenter.Subscribe<FileDownload>(this, "Download", (s) =>
{
NotificationID += 4;
var intent = new Intent(this, typeof(Service.DownloadManager));
intent.PutExtra("url", s.FileUrl);
intent.PutExtra("name", s.FileName);
_layout.SetMinimumHeight(3000);
_layout.Bottom = 350; ;
Snackbar.Make(_layout, "Document is Downloading.", Snackbar.LengthShort)
.Show();
StartService(intent);
});
}
//在Service文件夹中创建一个class DownloadManager.cs，复制下面所有代码并粘贴，只需更改Namespace
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace App.Droid.Service
{
[Service]
public class DownloadManager : Android.App.Service
{
AndroidNotificationManager NotificationManager = new AndroidNotificationManager();
public override IBinder OnBind(Intent intent)
{
return null;
}
public override void OnCreate()
{
}
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
Task.Run(() =>
{
int messageId = ++MainActivity.NotificationID;
string url = intent.GetStringExtra("url");
string filename = intent.GetStringExtra("name");
string extension = url.Substring(url.LastIndexOf('.'));
if (!filename.EndsWith(extension))
{
filename += extension;
}
NotificationManager.ScheduleNotification(filename, "", messageId);
String TempFileName = "";
try
{
HttpWebRequest Http = (HttpWebRequest)WebRequest.Create(url);
WebResponse Response = Http.GetResponse();
long length = Response.ContentLength;
var stream = Response.GetResponseStream();
string baseDir = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryDownloads).AbsolutePath;
//string baseDir = Android.App.Application.Context.GetExternalFilesDir(Android.OS.Environment.DirectoryDownloads).AbsolutePath;
//string baseDir = System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments);
//string baseDir = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
baseDir = Path.Combine(baseDir, filename.Substring(filename.LastIndexOf('/') + 1).Replace(' ', '_'));
Directory.CreateDirectory(baseDir);
//string filePath = Path.Combine(documentsPath, name);
if (filename.Length > 18)
{
TempFileName = filename.Substring(0, 18) + "...";
}
else
{
TempFileName = filename;
}
FileInfo fi = new FileInfo(Path.Combine(baseDir, filename.Substring(filename.LastIndexOf('/') + 1).Replace(' ', '_')));
var fis = fi.OpenWrite();
long count = 0;
int begpoint = 0;
bool iscancelled = false;
MessagingCenter.Subscribe<CancelNotificationModel>(this, "Cancel", sender =>
{
if (messageId == sender.ID)
{
iscancelled = true;
}
});
while (true)
{
try
{
if (iscancelled == true)
{
break;
}
// Read file
int bytesRead = 0;
byte[] b = new byte[1024 * 1024];
bytesRead = stream.Read(b, begpoint, b.Length);
if (bytesRead == 0)
break;
fis.Write(b, 0, bytesRead);
fis.Flush();
count += bytesRead;
System.Diagnostics.Debug.WriteLine(count + "-" + length);
if (count >= length)
break;
NotificationManager.ChangeProgress(TempFileName, (int)((count * 100) / length), messageId);
}
catch (Exception ex)
{
Http = (HttpWebRequest)WebRequest.Create(url);
WebHeaderCollection myWebHeaderCollection = Http.Headers;
Http.AddRange(count, length - 1);
Response = Http.GetResponse();
stream = Response.GetResponseStream();
}
}
fis.Close();
NotificationManager.RemoveNotification(messageId);
if (iscancelled == false)
{
new AndroidNotificationManager().DownloadCompleted(filename, "Download Completed", Path.Combine(baseDir, filename), ++messageId);
}
}
catch (Exception ex)
{
NotificationManager.RemoveNotification(messageId);
NotificationManager.FileCancelled(filename, "Download Cancelled, Please try again", ++messageId);
}
});
return StartCommandResult.NotSticky;
}
public override void OnDestroy()
{
}
}
public class CancelNotificationModel
{
public int ID { get; set; }
}
}
//在服务文件夹中创建一个class AndroidNotificationManager.cs
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using AndroidX.Core.App;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Xamarin.Essentials;
using AndroidApp = Android.App.Application;
namespace App.Droid.Service
{
public class AndroidNotificationManager
{
const string channelId = "default";
const string channelName = "Default";
const string channelDescription = "The default channel for notifications.";
const int pendingIntentId = 0;
public const string TitleKey = "title";
public const string MessageKey = "message";
bool channelInitialized = false;
NotificationManager manager;
NotificationCompat.Builder builder;
public event EventHandler NotificationReceived;
public void Initialize()
{
CreateNotificationChannel();
}
public void RemoveNotification(int messageid)
{
manager.Cancel(messageid);
}
public int ScheduleNotification(string title, string message, int messageId, bool isInfinite = false)
{
if (!channelInitialized)
{
CreateNotificationChannel();
}
Intent intent = new Intent(AndroidApp.Context, typeof(MainActivity));
intent.PutExtra(TitleKey, title);
intent.PutExtra(MessageKey, message);
PendingIntent pendingIntent = PendingIntent.GetActivity(AndroidApp.Context, pendingIntentId, intent, PendingIntentFlags.OneShot);
builder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
.SetContentTitle(title)
.SetContentText(message)
.SetPriority(NotificationCompat.PriorityLow)
.SetVibrate(new long[] { 0L })
.SetProgress(100, 0, isInfinite)
.SetSmallIcon(Resource.Drawable.checkcircle);
var notification = builder.Build();
manager.Notify(messageId, notification);
return messageId;
}
public void ChangeProgress(string filename, int progress, int messageId)
{
try
{
var actionIntent1 = new Intent();
actionIntent1.SetAction("Cancel");
actionIntent1.PutExtra("NotificationIdKey", messageId);
var pIntent1 = PendingIntent.GetBroadcast(Android.App.Application.Context, 0, actionIntent1, PendingIntentFlags.CancelCurrent);
var ProgressBuilder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
.SetSmallIcon(Resource.Drawable.checkcircle)
.SetContentTitle(filename)
.SetVibrate(new long[] { 0L })
.AddAction(Resource.Drawable.checkcircle, "Cancel", pIntent1)
.SetPriority(NotificationCompat.PriorityLow)
.SetProgress(100, progress, false)
.SetContentText(progress + "%")
.SetAutoCancel(false);
System.Diagnostics.Debug.WriteLine(progress);
manager.Notify(messageId, ProgressBuilder.Build());
}
catch
{
}
}
public void DownloadCompleted(string filenametitle, string Message, string filepath, int messageId)
{
try
{
if (!channelInitialized)
{
CreateNotificationChannel();
}
var CompletedBuilder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
.SetContentTitle(filenametitle)
.SetContentText(Message)
.SetAutoCancel(true)
.SetSmallIcon(Resource.Drawable.checkcircle);
Intent it = OpenFile(filepath, filenametitle);
if (it != null)
{
PendingIntent contentIntent =
PendingIntent.GetActivity(AndroidApp.Context,
pendingIntentId,
it,
PendingIntentFlags.OneShot
);
CompletedBuilder.SetContentIntent(contentIntent);
}
var notification = CompletedBuilder.Build();
manager.Notify(messageId, notification);
}
catch (Exception ex)
{
}
}
public void FileCancelled(string filenametitle, string Message, int messageId)
{
if (!channelInitialized)
{
CreateNotificationChannel();
}
var CompletedBuilder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
.SetContentTitle(filenametitle)
.SetContentText(Message)
.SetAutoCancel(true)
.SetSmallIcon(Resource.Drawable.checkcircle)
.SetDefaults((int)NotificationDefaults.Sound | (int)NotificationDefaults.Vibrate);
var notification = CompletedBuilder.Build();
manager.Notify(messageId, notification);
}
public void ReceiveNotification(string title, string message)
{
}
void CreateNotificationChannel()
{
manager = (NotificationManager)AndroidApp.Context.GetSystemService(AndroidApp.NotificationService);
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
var channelNameJava = new Java.Lang.String(channelName);
var channel = new NotificationChannel(channelId, channelNameJava, NotificationImportance.Low)
{
Description = channelDescription
};
manager.CreateNotificationChannel(channel);
}
channelInitialized = true;
}
public Intent OpenFile(string filePath, string fileName)
{
try
{
string application = "";
string extension = fileName.Substring(fileName.IndexOf('.'));
switch (extension.ToLower())
{
case ".doc":
case ".docx":
application = "application/msword";
break;
case ".pdf":
application = "application/pdf";
break;
case ".xls":
case ".xlsx":
application = "application/vnd.ms-excel";
break;
case ".jpg":
case ".jpeg":
case ".png":
application = "image/jpeg";
break;
case ".mp4":
application = "video/mp4";
break;
default:
application = "*/*";
break;
}
Java.IO.File file = new Java.IO.File(filePath);
bool isreadable =
file.SetReadable(true);
string ApplicationPackageName = AppInfo.PackageName;
var context = Android.App.Application.Context;
var component = new Android.Content.ComponentName(context, Java.Lang.Class.FromType(typeof(AndroidX.Core.Content.FileProvider)));
var info = context.PackageManager.GetProviderInfo(component, Android.Content.PM.PackageInfoFlags.MetaData);
var authority = info.Authority;
Android.Net.Uri uri = AndroidX.Core.Content.FileProvider.GetUriForFile(Android.App.Application.Context, authority, file);
Intent intent = new Intent(Intent.ActionView);
System.IO.File.AppendAllText((filePath + "backdebug.txt"), System.Environment.NewLine + "Point 3 uri done ");
intent.SetDataAndType(uri, application);
intent.AddFlags(ActivityFlags.GrantReadUriPermission);
intent.AddFlags(ActivityFlags.NoHistory);
intent.AddFlags(ActivityFlags.NewTask);
System.IO.File.AppendAllText((filePath + "backdebug.txt"), System.Environment.NewLine + "Point 4open file last ");
return intent;
}
catch (Exception ex)
{
Intent it = new Intent();
it.PutExtra("ex", ex.Message);
System.IO.File.AppendAllText((filePath + "backdebug.txt"), System.Environment.NewLine + "Point 4 uri done " + ex.Message);
return it;
}
}
}
}