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PreferenceManager.GetDefaultSharedPreferences(Context?) is obsolete: deprecated [duplicate]

This question already has answers here:
PreferenceManager getDefaultSharedPreferences deprecated in Android Q
(9 answers)
Closed 8 months ago.
I recently updated the nugget packages in my Android project and now I get a message in this line of code:
ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(Application.Context);
CS0618: PreferenceManager.GetDefaultSharedPreferences(Context?) is obsolete: deprecated
enter image description here
Is it necessary to change something? Will my code not work correctly like this? Should I completely remove private void storeToken(String token)? I'm not sure if I still need private void storeToken(String token).
using System;
using Android.App;
using Android.Content;
using Android.Util;
using Firebase.Messaging;
using System.Collections.Generic;
using Android.Preferences;
using Android.Media;
using AndroidX.Core.App;
namespace AndroidVersion
{
[Service]
[IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
public class MyFirebaseMessagingService : FirebaseMessagingService
{
const string TAG = "MyFirebaseMsgService";
public override void OnNewToken(string token)
{
Log.Debug(TAG, "Refreshed token: " + token);
storeToken(token);
}
private void storeToken(String token)
{
//saving the token on shared preferences
ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(Application.Context);
ISharedPreferencesEditor editor = prefs.Edit();
editor.PutString("my_token", token);
editor.Apply();
}
public override void OnMessageReceived(RemoteMessage message)
{
Log.Debug(TAG, "From: " + message.From);
var body = message.GetNotification().Body;
var title = message.GetNotification().Title;
Log.Debug(TAG, "Notification Message Body: " + message.GetNotification().Body);
SendNotification(body, title, message.Data);
}
void SendNotification(string messageBody, string Title, IDictionary<string, string> data)
{
var intent = new Intent(this, typeof(Activity1));
intent.AddFlags(ActivityFlags.ClearTop);
foreach (var key in data.Keys)
{
intent.PutExtra(key, data[key]);
}
var pendingIntent = PendingIntent.GetActivity(this,
Activity1.NOTIFICATION_ID,
intent,
PendingIntentFlags.OneShot);
var notificationBuilder = new NotificationCompat.Builder(this, Activity1.CHANNEL_ID)
.SetSmallIcon(Resource.Drawable.Icon)
.SetContentTitle(Title)
.SetContentText(messageBody)
.SetSound(RingtoneManager.GetDefaultUri(RingtoneType.Notification))
.SetVibrate(new long[] { 1000, 1000, 0, 0, 0 })
.SetLights(Android.Graphics.Color.Red, 3000, 3000)
.SetPriority((int)NotificationPriority.High)
.SetAutoCancel(true)
.SetContentIntent(pendingIntent);
var notificationManager = NotificationManagerCompat.From(this);
notificationManager.Notify(Activity1.NOTIFICATION_ID, notificationBuilder.Build());
}
}
}

I use implementation 'androidx.preference:preference-ktx:1.1.1'
successfully replaced the deprecated android.preference.PreferenceManager in my project

Use using AndroidX.Preference; instead of using Android.Preferences;

Repeating Notifications Lost After Android Device Reboot Xamarin Forms App C#

I am working on a Xamarin Forms app in C#. I followed this tutorial to setup local notifications that are repeating:
https://www.c-sharpcorner.com/article/how-to-send-local-notification-with-repeat-interval-in-xamarin-forms/
For the most part everything works with regards to the notifications firing. However if I reboot the device I no longer get any notifications.
Here is my broadcast receiver class:
[BroadcastReceiver(Enabled = true, Label = "Local Notifications Broadcast Receiver")]
[IntentFilter(new[] { Intent.ActionBootCompleted })]
public class ScheduledAlarmHandler : BroadcastReceiver
{
public const string LocalNotificationKey = "LocalNotification";
NotificationManager manager;
const string channelId = "default";
const string channelName = "Default";
const string channelDescription = "The default channel for notifications.";
public const string TitleKey = "title";
public const string MessageKey = "message";
bool channelInitialized = false;
public override void OnReceive(Context context, Intent intent)
{
if (!channelInitialized)
{
CreateNotificationChannel();
}
ComponentName receiver = new ComponentName(AndroidApp.Context, Class.FromType(typeof(ScheduledAlarmHandler)).Name);
PackageManager pm = AndroidApp.Context.PackageManager;
pm.SetComponentEnabledSetting(receiver, ComponentEnabledState.Enabled, ComponentEnableOption.DontKillApp);
var extra = intent.GetStringExtra(LocalNotificationKey);
var notification = DeserializeNotification(extra);
// Generating notification
var builder = new NotificationCompat.Builder(AndroidApp.Context, channelId)
.SetContentTitle(notification.Title)
.SetContentText(notification.Body)
.SetSmallIcon(notification.IconId)
.SetSound(RingtoneManager.GetDefaultUri(RingtoneType.Ringtone))
.SetAutoCancel(true);
var resultIntent = AndroidNotificationManager.GetLauncherActivity();
resultIntent.SetFlags(ActivityFlags.NewTask | ActivityFlags.ClearTask);
var stackBuilder = Android.Support.V4.App.TaskStackBuilder.Create(AndroidApp.Context);
stackBuilder.AddNextIntent(resultIntent);
Random random = new Random();
int randomNumber = random.Next(9999 - 1000) + 1000;
var resultPendingIntent =
stackBuilder.GetPendingIntent(randomNumber, (int)PendingIntentFlags.CancelCurrent);
builder.SetContentIntent(resultPendingIntent);
// Sending notification
var notificationManager = NotificationManagerCompat.From(AndroidApp.Context);
var notificationToNotify = builder.Build();
notificationManager.Notify(randomNumber, notificationToNotify);
}
private LocalNotification DeserializeNotification(string notificationString)
{
var xmlSerializer = new XmlSerializer(typeof(LocalNotification));
using (var stringReader = new StringReader(notificationString))
{
var notification = (LocalNotification)xmlSerializer.Deserialize(stringReader);
return notification;
}
}
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.Default)
{
Description = channelDescription
};
manager.CreateNotificationChannel(channel);
}
channelInitialized = true;
}
}
The tutorial didn't have the IntentFilter attribute added to the class or updates to the manifest file, but I added those in later while searching for solutions.
Here is my AndroidManifest file:
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.service_buddy">
<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
<application android:label="Service_Buddy.Android"></application>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<application>
<receiver android:name="ServiceBuddy.Droid.ScheduledAlarmHandler" android:enabled="true" android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"></action>
</intent-filter>
</receiver>
</application>
</manifest>```

As far as I know , After rebooting there is no memory ,it is gone , therefor there is nothing to do job .
Don't waste your time , just use Shiny , it is a real problem solver in realm of background and foreground service in xamarin .
shiny getting started

plain text with share option list gives error

Okay so i have a weird error here that i can't figure out. I am sharing data with share option list in android "android.intent.action.SEND".
Sharing single image works perfectly, but when i try to share just plain text such as "asdfdgdsfsa", the program throws this error
"Java.Lang.RuntimeException: Unable to instantiate activity
ComponentInfo{com.companyname.Revamp/Revamp.RecieveDataFromApp.RecieveDataFromApp}:
java.lang.ClassNotFoundException: Didn't find class
"Revamp.RecieveDataFromApp.RecieveDataFromApp" on path:
DexPathList[[zip file
"/data/app/com.companyname.Revamp-HFm6SmD1Y-A76OQwcwCXIA==/base.apk"],nativeLibraryDirectories=[/data/app/com.companyname.Revamp-HFm6SmD1Y-A76OQwcwCXIA==/lib/x86,
/system/fake-libs,
/data/app/com.companyname.Revamp-HFm6SmD1Y-A76OQwcwCXIA==/base.apk!/lib/x86,
/system/lib, /vendor/lib]] ".
protected override void OnCreate(Bundle bundle)
{
Intent intent = Intent;
String action = Intent.Action;
String type = intent.Type;
if (Intent.ActionSend.Equals(action) && type != null)
{
// This is what we are trying to get working here.
if ("text/plain".Equals(type))
{
// Handle text being sent
// ...
// ...
// ...
}
else if (type.StartsWith("image/"))
{
// Handle single image being sent
// ...
// ...
// ...
}
}
else if (Intent.ActionSendMultiple.Equals(action) && type != null)
{
//This works
if (type.StartsWith("image/"))
{
// Handle multiple images being sent
// ...
// ...
// ...
}
}
else
{
// Handle other intents, such as being started from the home screen
}
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
base.OnCreate(bundle);
global::Xamarin.Forms.Forms.Init(this, bundle);
LoadApplication(new App());
}
<activity android:name="Revamp.RecieveDataFromApp.RecieveDataFromApp" android:icon="#drawable/ic_home">
<intent-filter>
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="image/*" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.SEND_MULTIPLE" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="image/*" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.GET_CONTENT" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="*/*" />
</intent-filter>
</activity>

I have tested your code and reproduce the issue. You could try to set the intent-filter in code, not in AndroidManifest.xml.
For example:
[Activity(Label = "RecieveDataFromApp", Icon = "#drawable/icon", Theme = "#style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
[IntentFilter(new[] { Intent.ActionSend }, Categories = new[] { Intent.CategoryDefault }, DataMimeType = "image/*", Label = "RecieveDataFromApp")]
[IntentFilter(new[] { Intent.ActionSend }, Categories = new[] { Intent.CategoryDefault }, DataMimeType = "text/plain", Label = "RecieveDataFromApp")]
[IntentFilter(new[] { Intent.ActionSendMultiple }, Categories = new[] { Intent.CategoryDefault }, DataMimeType = "image/*", Label = "RecieveDataFromApp")]
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
...
...
...
}

Not calling method OnMessageReceived in xamarin

I am implementing remote notification on android using xamarin.
I am doing POC using Walkthrough - Using Remote Notifications in Xamarin.Android
I am not getting notification on mobile, after registering mobile and send notification through sender using GCM.
Is there any mistake in code? or Can I track my notification to get detail why it is not come in mobile?
MyGcmListenerService.cs
[Service(Exported = false), IntentFilter(new[] { "com.google.android.c2dm.intent.RECEIVE" })]
public class MyGcmListenerService : GcmListenerService
{
public override void OnMessageReceived(string from, Bundle data)
{
var message = data.GetString("message");
Log.Debug("MyGcmListenerService", "From: " + from);
Log.Debug("MyGcmListenerService", "Message: " + message);
SendNotification(message);
}
....
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.yourcompany.LeaveApplication" android:installLocation="auto" android:versionCode="1" android:versionName="1.0">
<uses-sdk android:minSdkVersion="15" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.yourcompany.LeaveApplication.permission.C2D_MESSAGE" />
<permission android:name="com.yourcompany.LeaveApplication.permission.C2D_MESSAGE" android:protectionLevel="signature" />
<application android:label="XamarinLeaveApp" >
<receiver android:name="com.google.android.gms.gcm.GcmReceiver" android:exported="true" android:permission="com.google.android.c2dm.permission.SEND">
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<action android:name="com.google.android.c2dm.intent.REGISTRATION" />
<category android:name="com.yourcompany.LeaveApplication" />
</intent-filter>
</receiver>
</application>
</manifest>
Message Sender's code
var jGcmData = new JObject();
var jData = new JObject();
jData.Add("message", MESSAGE);
jGcmData.Add("to", "/topics/global");
jGcmData.Add("data", jData);
var url = new Uri("https://gcm-http.googleapis.com/gcm/send");
try
{
using (var client = new HttpClient())
{
client.DefaultRequestHeaders.Accept.Add(
new MediaTypeWithQualityHeaderValue("application/json"));
client.DefaultRequestHeaders.TryAddWithoutValidation(
"Authorization", "key=" + API_KEY);
Task.WaitAll(client.PostAsync(url,
new StringContent(jGcmData.ToString(), Encoding.Default, "application/json"))
.ContinueWith(response =>
{
var response1 = response;
// Console.WriteLine(response);
//Console.WriteLine("Message sent: check the client device notification tray.");
}));
}
}
RegistrationIntentService.cs
[Service(Exported = false)]
class RegistrationIntentService : IntentService
{
static object locker = new object();
public RegistrationIntentService() : base("RegistrationIntentService") { }
protected override void OnHandleIntent(Intent intent)
{
try
{
Log.Info("RegistrationIntentService", "Calling InstanceID.GetToken");
lock (locker)
{
var instanceID = InstanceID.GetInstance(Application.Context);
var token = instanceID.GetToken(
"<project number", GoogleCloudMessaging.InstanceIdScope, null);
Log.Info("RegistrationIntentService", "GCM Registration Token: " + token);
SendRegistrationToAppServer(token);
Subscribe(token);
}
}
catch (Exception e)
{
Log.Debug("RegistrationIntentService", "Failed to get a registration token");
return;
}
}
void SendRegistrationToAppServer(string token)
{
// Add custom implementation here as needed.
}
void Subscribe(string token)
{
var pubSub = GcmPubSub.GetInstance(Application.Context);
pubSub.Subscribe(token, "/topics/global", null);
}
}

in the RegistrationIntentService.cs file, you use Application.Context instead of this. It should be equivalent, but can you try?
Also, I do not see in your code the protected override void OnCreate method that registers the RegistrationIntentService intent. Didn't you paste it here or did you forget to implement it?
HTH

Silverlight not accessing content when using https

I have a SL app that has https and http endpoints. If i access the endpoint on http, then just have a screen which loads an external image
http://somedomain.com/domaimage.jpg
It will work fine.
If i access the SL app on https:// then load the same image it won't even attempt to make the web request for the image.
Why when SL is running on https i doesn't request external content? I have this in my clientaccesspolicy.xml
<?xml version="1.0" encoding="utf-8"?>
<access-policy>
<cross-domain-access>
<policy>
<allow-from http-request-headers="*" http-methods="*">
<domain uri="http://*"/>
<domain uri="https://*"/>
</allow-from>
<grant-to>
<resource path="/" include-subpaths="true"/>
</grant-to>
</policy>
</cross-domain-access>
and this is my crossdomain.xml
<?xml version="1.0"?>
<cross-domain-policy>
<allow-access-from domain="*" />
</cross-domain-policy>
Thanks
Steve

Now using an image proxy to access external content, if it helps anyone
ImageProxy.ashx
public class ImageUrlProxy : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
try
{
string url = context.Request.Headers["Url"];
var client = new WebClient();
byte[] imageDataBytes = client.DownloadData(url);
context.Response.ContentType = "application/json;";
context.Response.Write(JsonConvert.SerializeObject(imageDataBytes));
}
catch (Exception)
{
throw;
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
Helper class:
public static class ImageProxyHelper
{
public static void GetImageByProxy(string url, Action<BitmapImage> callback)
{
if (callback == null) return;
var client = new WebClient();
client.DownloadStringCompleted += (sender, args) =>
{
if (args.Error == null)
{
var buffer = JsonConvert.DeserializeObject<byte[]>(args.Result);
var im = new BitmapImage() { CreateOptions = BitmapCreateOptions.None };
im.SetSource(new MemoryStream(buffer));
callback(im);
}
};
client.Headers["Url"] = url;
client.DownloadStringAsync(UrlBuilder("ImageUrlProxy.ashx"));
}
public static Uri UrlBuilder(string fragment)
{
var uriBuilder = new UriBuilder(Application.Current.Host.Source.Scheme,
Application.Current.Host.Source.Host,
Application.Current.Host.Source.Port, fragment);
return uriBuilder.Uri;
}
}
Then from silverlight:
ImageProxyHelper.GetImageByProxy("http://externaldomain.com/image.jpg", p=>{
//Do something here
})
This can be extended to return any external content ^^

You are having the same problem as this question
Https and http Image URL Not loading in silverlight
It is down to cross scheme calls in silverlight