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[Bug] [Android] Intermittent error in production: Font not found /data/user/0/com.package.whatever/cache/font.ttf
Description
This exception is being reported intermittently, where the application seems to be unable to find the font file in the cache folder.
Error message:
Font not found /data/user/0/com.package.whatever/cache/font.ttf
Stack trace
JniEnvironment+StaticMethods.CallStaticObjectMethod (Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args)
JniPeerMembers+JniStaticMethods.InvokeObjectMethod (System.String encodedMember, Java.Interop.JniArgumentValue* parameters)
Typeface.CreateFromFile (System.String path)
FontExtensions.TryGetFromAssets (System.String fontName)
FontExtensions.ToTypeFace (System.String fontfamily, Xamarin.Forms.FontAttributes attr)
FontExtensions.CreateTypeface (System.Tuple`2[T1,T2] key)
ConcurrentDictionary`2[TKey,TValue].GetOrAdd (TKey key, System.Func`2[T,TResult] valueFactory)
FontExtensions.ToTypeface (System.String fontFamily, Xamarin.Forms.FontAttributes fontAttributes)
FontExtensions.ToTypeface (Xamarin.Forms.Font self)
LabelRenderer.UpdateFont ()
LabelRenderer.UpdateText ()
LabelRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e)
LabelRenderer.set_Element (Xamarin.Forms.Label value)
IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element)
Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context)
VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren)
VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement)
VisualElementPackager.Load ()
VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager)
VisualElementRenderer`1[TElement].SetElement (TElement element)
IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element)
Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context)
VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren)
VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement)
VisualElementPackager.Load ()
VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager)
VisualElementRenderer`1[TElement].SetElement (TElement element)
IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element)
Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context)
VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren)
VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement)
VisualElementPackager.Load ()
VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager)
VisualElementRenderer`1[TElement].SetElement (TElement element)
IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element)
Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context)
VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren)
VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement)
VisualElementPackager.Load ()
FrameRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e)
FrameRenderer.set_Element (Xamarin.Forms.Frame value)
IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element)
Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context)
VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren)
VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement)
VisualElementPackager.Load ()
VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager)
VisualElementRenderer`1[TElement].SetElement (TElement element)
IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element)
Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context)
VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren)
VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement)
VisualElementPackager.Load ()
VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager)
VisualElementRenderer`1[TElement].SetElement (TElement element)
IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element)
Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context)
ShellContentFragment.OnCreateView (Android.Views.LayoutInflater inflater, Android.Views.ViewGroup container, Android.OS.Bundle savedInstanceState)
Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_inflater, System.IntPtr native_container, System.IntPtr native_savedInstanceState)
(wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.51(intptr,intptr,intptr,intptr,intptr)
java.lang.RuntimeException: Font not found /data/user/0/com.packagename.redacted/cache/font.ttf
android.graphics.Typeface.createFromFile Typeface.java:332
crc643f46942d9dd1fff9.ShellContentFragment.n_onCreateView(Native Method)
crc643f46942d9dd1fff9.ShellContentFragment.onCreateView ShellContentFragment.java:69
androidx.fragment.app.Fragment.performCreateView Fragment.java:2963
androidx.fragment.app.FragmentStateManager.createView FragmentStateManager.java:518
androidx.fragment.app.FragmentStateManager.moveToExpectedState FragmentStateManager.java:282
androidx.fragment.app.FragmentManager.executeOpsTogether FragmentManager.java:2189
androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute FragmentManager.java:2100
androidx.fragment.app.FragmentManager.execPendingActions FragmentManager.java:2002
androidx.fragment.app.FragmentManager$5.run FragmentManager.java:524
android.os.Handler.handleCallback Handler.java:751
android.os.Handler.dispatchMessage Handler.java:95
android.os.Looper.loop Looper.java:186
android.app.ActivityThread.main ActivityThread.java:6513
java.lang.reflect.Method.invoke(Native Method)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run ZygoteInit.java:914
com.android.internal.os.ZygoteInit.main ZygoteInit.java:804
Steps to Reproduce
- Add ExportFont assembly directive.
- Include ttf font file.
- Deploy an app to production
Expected Behavior
The app won't crash and fonts will always be loaded successfully.
Actual Behavior
I've seen this error reported twice in the last couple of weeks, both with similar stack traces as above.
Basic Information
- Version with issue: 5.0.0.2291
- Last known good version: n/a (didn't use fonts in previous app version)
- Platform Target Frameworks:
- iOS: 15.4.0.0
- Android: 12.0.0.3
- UWP: n/a
- Android Support Library / AndroidX Version: n/a
- NuGet Packages: Xamarin.Forms
- Affected Devices: Reported on CPH1801 and Galaxy J6
Environment
Show/Hide Visual Studio info
Visual Studio Community 2019 for Mac
Version 8.10.16 (build 2)
Installation UUID: d84992da-d070-4eea-b6f4-ffdcfdf9880c
GTK+ 2.24.23 (Raleigh theme)
Xamarin.Mac 6.18.0.23 (d16-6 / 088c73638)
Package version: 612000162
Mono Framework MDK
Runtime:
Mono 6.12.0.162 (2020-02/2ca650f1f62) (64-bit)
Package version: 612000162
Roslyn (Language Service)
3.10.0-4.21269.26+029847714208ebe49668667c60ea5b0a294e0fcb
NuGet
Version: 5.9.0.7134
.NET SDK (x64)
SDK: /usr/local/share/dotnet/sdk/5.0.404/Sdks
SDK Versions:
5.0.404
5.0.403
5.0.402
5.0.401
5.0.400
5.0.302
5.0.301
5.0.203
5.0.202
5.0.201
5.0.103
5.0.102
5.0.101
5.0.100
3.1.416
3.1.415
3.1.414
3.1.413
3.1.412
3.1.411
3.1.410
3.1.409
3.1.408
3.1.407
3.1.406
3.1.405
3.1.404
3.1.403
3.1.402
3.1.401
3.1.302
3.0.100
2.1.401
2.1.4
2.0.0
MSBuild SDKs: /Applications/Visual Studio.app/Contents/Resources/lib/monodevelop/bin/MSBuild/Current/bin/Sdks
.NET Core Runtime
Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
5.0.13
5.0.12
5.0.11
5.0.10
5.0.9
5.0.8
5.0.7
5.0.6
5.0.5
5.0.4
5.0.3
5.0.2
5.0.1
5.0.0
3.1.22
3.1.21
3.1.20
3.1.19
3.1.18
3.1.17
3.1.16
3.1.15
3.1.14
3.1.13
3.1.12
3.1.11
3.1.10
3.1.9
3.1.8
3.1.7
3.1.6
3.0.0
2.1.23
2.1.22
2.1.21
2.1.20
2.1.3
2.0.5
2.0.0
1.0.5
Xamarin.Profiler
Version: 1.6.15.68
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler
Updater
Version: 11
Xamarin.Android
Version: 12.0.0.3 (Visual Studio Community)
Commit: xamarin-android/d16-11/f0e3c2d
Android SDK: /Users/greg/Library/Android/sdk
Supported Android versions:
None installed
SDK Tools Version: 26.1.1
SDK Platform Tools Version: 30.0.4
SDK Build Tools Version: 30.0.2
Build Information:
Mono: c633fe9
Java.Interop: xamarin/java.interop/d16-11@476bb5b
ProGuard: Guardsquare/proguard/v7.0.1@912d149
SQLite: xamarin/sqlite/3.35.4@85460d3
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-11@87af37b
Eclipse Temurin JDK
Java SDK: Not Found
Android SDK Manager
Version: 16.10.0.13
Hash: 1b81df5
Branch: remotes/origin/d16-10
Build date: 2021-11-12 01:17:32 UTC
Android Device Manager
Version: 16.10.0.15
Hash: 89dcc0b
Branch: remotes/origin/d16-10
Build date: 2021-11-12 01:17:52 UTC
Apple Developer Tools
Xcode 13.2.1 (19586)
Build 13C100
Xamarin.Mac
Version: 8.4.0.0 (Visual Studio Community)
Hash: 8fc41ae82
Branch: xcode13.2
Build date: 2021-12-09 01:07:56-0500
Xamarin.iOS
Version: 15.4.0.0 (Visual Studio Community)
Hash: 8fc41ae82
Branch: xcode13.2
Build date: 2021-12-09 01:07:56-0500
Xamarin Designer
Version: 16.11.0.39
Hash: cd672761d
Branch: remotes/origin/d16-11
Build date: 2021-10-06 21:09:18 UTC
Build Information
Release ID: 810160002
Git revision: 6dbc7886fa608147f685a7df3912249400c84716
Build date: 2021-12-14 15:54:37-05
Build branch: release-8.10
Operating System
Mac OS X 11.6.1
Darwin 20.6.0 Darwin Kernel Version 20.6.0
Tue Oct 12 18:33:42 PDT 2021
root:xnu-7195.141.8~1/RELEASE_X86_64 x86_64
Build Logs
Screenshots
Reproduction Link
Workaround
Do you have any additional code that does something with the fonts? How do you load/add the fonts to your project? Do you see this only on Android or also iOS?
Not doing anything special, just followed your guide here: https://devblogs.microsoft.com/xamarin/embedded-fonts-xamarin-forms/
I think the problem is that EmbeddedFontLoader for Android creates the font file in the cache folder:
https://github.com/xamarin/Xamarin.Forms/blob/41a65486600895ea182187358ff2f8ebc8c99290/Xamarin.Forms.Platform.Android/EmbeddedFontLoader.cs#L15
The OS can clear the cache folder at any time, so we need to handle when the file doesn't exist by just creating the font file again. (https://developer.android.com/training/data-storage/app-specific#internal-create-cache)
I can submit a PR if you could talk me through your preferred fix (was thinking maybe move all the calls to CreateFromFile in FontExtensions into a method somewhere and call LoadFont again inside a catch?).
But if it exists, we return it and else we try to move it there, that is already happening, right?
https://github.com/xamarin/Xamarin.Forms/blob/41a65486600895ea182187358ff2f8ebc8c99290/Xamarin.Forms.Platform.Android/EmbeddedFontLoader.cs#L18-L27
Yes, but it appears that FontRegistrar keeps a cache of loaded fonts, so the LoadFont method isn't called again after the first time:
https://github.com/xamarin/Xamarin.Forms/blob/caab66bcf9614aca0c0805d560a34e176d196e17/Xamarin.Forms.Core/FontRegistrar.cs#L33
Maybe bypass the cache on Android and call LoadFont every time? This would ensure the file always exists.
Closing this as I've been unable to reproduce it. Will continue trying and open a new issue if necessary.
thats rare but coming now and then, I have just got for android. Font is there its working fine but I dont get why this error is occuring even not very often. I am using the latest version of the XF and AndroidX libraries.
Android: 6.0.1 Android Build: MXB48T Manufacturer: LGE Model: LG-K220
Java.Lang.RuntimeException: Font not found /data/user/0/myapp.myapp/cache/Roboto-Bold.ttf
at Java.Interop.JniEnvironment+StaticMethods.CallStaticObjectMethod (Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0006e] in <6cf3794da10241fd9d34414fe7eafbd2>:0
at Java.Interop.JniPeerMembers+JniStaticMethods.InvokeObjectMethod (System.String encodedMember, Java.Interop.JniArgumentValue* parameters) <0x9681a13c + 0x00077> in <6cf3794da10241fd9d34414fe7eafbd2>:0
at Android.Graphics.Typeface.CreateFromFile (System.String path) [0x00029] in <5751d045d69b4cbbb7d00f614ccc9184>:0
at Xamarin.Forms.Platform.Android.FontExtensions.TryGetFromAssets (System.String fontName) [0x00016] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FontExtensions.ToTypeFace (System.String fontfamily, Xamarin.Forms.FontAttributes attr) [0x0000c] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FontExtensions.CreateTypeface (System.Tuple`2[T1,T2] key) [0x0004b] in <04c545f414d24a37af95d995791bb9a9>:0
at System.Collections.Concurrent.ConcurrentDictionary`2[TKey,TValue].GetOrAdd (TKey key, System.Func`2[T,TResult] valueFactory) <0x968ede8c + 0x000d7> in <05554d90551f418e8302a63853e107d6>:0
at Xamarin.Forms.Platform.Android.FontExtensions.ToTypeface (System.String fontFamily, Xamarin.Forms.FontAttributes fontAttributes) [0x00018] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FontExtensions.ToTypeface (Xamarin.Forms.Font self) <0x956b3b68 + 0x0008f> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FastRenderers.LabelRenderer.UpdateFont () [0x0000b] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FastRenderers.LabelRenderer.UpdateText () [0x0011e] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FastRenderers.LabelRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e) [0x00086] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FastRenderers.LabelRenderer.set_Element (Xamarin.Forms.Label value) [0x00025] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FastRenderers.LabelRenderer.Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00015] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) <0x956a9e90 + 0x00107> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) <0x956c409c + 0x00227> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) <0x956c45e8 + 0x003f3> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) <0x956c8294 + 0x00063> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].SetElement (TElement element) <0x956c653c + 0x00333> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementRenderer`1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) <0x956c5688 + 0x00093> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) <0x956a9e90 + 0x00107> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) <0x956c409c + 0x00227> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) <0x956c45e8 + 0x003f3> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () <0x956c4048 + 0x00037> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FastRenderers.FrameRenderer.OnElementChanged (Xamarin.Forms.Platform.Android.ElementChangedEventArgs`1[TElement] e) [0x00098] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FastRenderers.FrameRenderer.set_Element (Xamarin.Forms.Frame value) [0x00025] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.FastRenderers.FrameRenderer.Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00015] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) <0x956a9e90 + 0x00107> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) <0x956c409c + 0x00227> in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Platform.Android.VisualElementPackager.OnChildAdded (System.Object sender, Xamarin.Forms.ElementEventArgs e) [0x0000f] in <04c545f414d24a37af95d995791bb9a9>:0
at Xamarin.Forms.Element.OnChildAdded (Xamarin.Forms.Element child) <0x955c0c00 + 0x000a7> in <978ec34c5c9c4c4eb3d73b6da958bcd6>:0
at Xamarin.Forms.VisualElement.OnChildAdded (Xamarin.Forms.Element child) <0x955f6818 + 0x00047> in <978ec34c5c9c4c4eb3d73b6da958bcd6>:0
at Syncfusion.ListView.XForms.ListViewItem.OnChildAdded (Xamarin.Forms.Element child) [0x00000] in <f031c2d0f0dc4e3a9f19bf76336fbc57>:0
I'm going to reopen this, I have a reproduction scenario. I'll put something together and add it here.
I encountered this today during development on an emulator, so I've got a full stack trace with line numbers now, which is more useful.
My current theory is that the Dictionary used to cache the font files in FontRegistrar is preventing the file from being recreated because LoadFont is only ever called once - the first time it's needed (the stack trace I've got doesn't pass through that method so it doesn't check that the file exists).
The font files are being deleted while the app is running, the emulator was low on disk space when the crash occurred. It's likely that the few users who are being affected have a low amount of storage available on their device.
Hi @greg84 ,
We see similar crashes (#15416) on our app, any ETA for the fix?
Seeing this issue too by adding a new font to a currently installed app. The font doesn't load and the error message detailed above is shown in the output.
I'm also getting this crash reported in AppCenter for few Android devices, Any workaround?
started seeing these crashes too (Font asset not found) - just from one user at the moment (Galaxy A22s 5G, on Android 13)... this is in code that has been in production for years and as far as I know we've not had these failures before. Maybe google have changed something recently which is causing these to be more common?
Edit: noticed we also had another on a Galaxy Tab A7 on Android 12
Same here. Definitely a more common issue that I haven't seen before. All of my AppCenter crashes are coming from Android 13 devices. All Galaxy devices as well
This is a critical issue for me also, as it makes production apps crash constantly. Please resolve it. Migrating to MAUI would be a lot bigger job, and out client won't will to pay for that, just because there's a framework bug in Xamarin.Forms.
Try running your app in a really lowend emulator with low resources. For us it turned out that one of our ViewModels started a resource-heavy task on the main thread, which resulted in an out of memory exception. This crash about missing a font was just the simptom of this memory problem. (Possibly the device went out of memory, and to try to handle that, it cleared the cache also.) When I move that task to a background thread, the problem disappeared.
Same here. Definitely a more common issue that I haven't seen before. All of my AppCenter crashes are coming from Android 13 devices. All Galaxy devices as well
Similar experience for us - only has become an issue relatively recently for apps that are otherwise years old. Happening on Android 13 / Galaxy Tab devices...
Add added the next code to my Android project:
[assembly: ExportRenderer(typeof(EmbeddedFont), typeof(MyEmbeddedFontLoader))]
namespace MyProject.Droid
{
public class MyEmbeddedFontLoader : IEmbeddedFontLoader
{
public (bool success, string? filePath) LoadFont(EmbeddedFont font)
{
var tmpdir = Xamarin.Essentials.FileSystem.AppDataDirectory;
var filePath = Path.Combine(tmpdir, font.FontName);
var fileInfo = new FileInfo(filePath);
if (fileInfo.Exists && fileInfo.Length == font.ResourceStream.Length)
return (true, filePath);
try
{
using (var fileStream = File.Create(filePath))
{
font.ResourceStream.CopyTo(fileStream);
}
return (true, filePath);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
Debug.WriteLine(ex.StackTrace);
File.Delete(filePath);
}
return (false, null);
}
}
}
Add added the next code to my Android project:
[assembly: ExportRenderer(typeof(EmbeddedFont), typeof(MyEmbeddedFontLoader))] namespace MyProject.Droid { public class MyEmbeddedFontLoader : IEmbeddedFontLoader { public (bool success, string? filePath) LoadFont(EmbeddedFont font) { var tmpdir = Xamarin.Essentials.FileSystem.AppDataDirectory; var filePath = Path.Combine(tmpdir, font.FontName); var fileInfo = new FileInfo(filePath); if (fileInfo.Exists && fileInfo.Length == font.ResourceStream.Length) return (true, filePath); try { using (var fileStream = File.Create(filePath)) { font.ResourceStream.CopyTo(fileStream); } return (true, filePath); } catch (Exception ex) { Debug.WriteLine(ex.Message); Debug.WriteLine(ex.StackTrace); File.Delete(filePath); } return (false, null); } } }
@ArtjomP that code is essentially exactly the same as the default font loader already in xamarin forms. how is that supposed to change things? [pardon me if i've missed something obvious - this is a genuine question, not a critique]
Add added the next code to my Android project:
[assembly: ExportRenderer(typeof(EmbeddedFont), typeof(MyEmbeddedFontLoader))] namespace MyProject.Droid { public class MyEmbeddedFontLoader : IEmbeddedFontLoader { public (bool success, string? filePath) LoadFont(EmbeddedFont font) { var tmpdir = Xamarin.Essentials.FileSystem.AppDataDirectory; var filePath = Path.Combine(tmpdir, font.FontName); var fileInfo = new FileInfo(filePath); if (fileInfo.Exists && fileInfo.Length == font.ResourceStream.Length) return (true, filePath); try { using (var fileStream = File.Create(filePath)) { font.ResourceStream.CopyTo(fileStream); } return (true, filePath); } catch (Exception ex) { Debug.WriteLine(ex.Message); Debug.WriteLine(ex.StackTrace); File.Delete(filePath); } return (false, null); } } }@ArtjomP that code is essentially exactly the same as the default font loader already in xamarin forms. how is that supposed to change things? [pardon me if i've missed something obvious - this is a genuine question, not a critique]
It uses Xamarin.Essentials.FileSystem.AppDataDirectory instead of temp folder. Android should not remove files from Xamarin.Essentials.FileSystem.AppDataDirectory.
Although I found way to reproduce this issue. Requirements: Samsung device with Android 13. Steps:
- Open an app
- Quit app, app should be in background
- Open device settings, open app details
- Clear app cache
- Resume app After that app will crash. For some reason issue does not reproduces on Android Emulator and other android devices.
I have no issues working in emulators, but as I start to test my app on an actual device, I also get such error.
Host: MacOS, Windows IDE: Rider (MACOS), Visual Studio (Windows) Android Device: Surface Duo 1
