maui: Microsoft.Maui.FontManager: Warning: Unable to load font 'sans-serif-medium' from assets.

Description

There are no changes about fonts of project, when start debuging a simple program just has added communitytoolkit.mvvm and use class:ObservableObject attr: [ObservableProperty] attr:[RelayCommand] then font warning is appeared how to slove it？

> am start -a "android.intent.action.MAIN" -c "android.intent.category.LAUNCHER" -n "com.companyname.m3/crc64f3d528bca3d24857.MainActivity"
> Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.companyname.m3/crc64f3d528bca3d24857.MainActivity }
Resolved pending breakpoint for 'Android.Runtime.JNIEnv.RegisterJniNatives(System.IntPtr, System.Int32, System.IntPtr, System.IntPtr, System.Int32)' to /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNIEnv.cs:127 [0x00000].
Resolved pending breakpoint for 'Xamarin.HotReload.HotReloadAgent.BreakpointSendToIde(System.String)' to D:\a\_work\1\s\HotReload\Source\Xamarin.HotReload.Agent\HotReloadAgent.cs:423 [0x00000].
Resolved pending breakpoint for 'Xamarin.HotReload.HotReloadAgent.BreakpointCheckpoint()' to D:\a\_work\1\s\HotReload\Source\Xamarin.HotReload.Agent\HotReloadAgent.cs:418 [0x00000].
[.companyname.m] Late-enabling -Xcheck:jni
[.companyname.m] Unquickening 12 vdex files!
[.companyname.m] Unexpected CPU variant for X86 using defaults: x86_64
[.companyname.m] The ClassLoaderContext is a special shared library.
[NetworkSecurityConfig] No Network Security Config specified, using platform default
[NetworkSecurityConfig] No Network Security Config specified, using platform default
[debug-app-helper] Checking if libmonodroid was unpacked to /data/app/~~VJPZXjgXgUpvzaIZui6sJA==/com.companyname.m3-hjElyQLeTMNL9_qRI5s9Iw==/lib/x86_64/libmonodroid.so
[debug-app-helper] Native libs extracted to /data/app/~~VJPZXjgXgUpvzaIZui6sJA==/com.companyname.m3-hjElyQLeTMNL9_qRI5s9Iw==/lib/x86_64, assuming application/android:extractNativeLibs == true
[debug-app-helper] Setting up for DSO lookup in app data directories
[debug-app-helper] Added filesystem DSO lookup location: /data/app/~~VJPZXjgXgUpvzaIZui6sJA==/com.companyname.m3-hjElyQLeTMNL9_qRI5s9Iw==/lib/x86_64
[debug-app-helper] Using runtime path: /data/app/~~VJPZXjgXgUpvzaIZui6sJA==/com.companyname.m3-hjElyQLeTMNL9_qRI5s9Iw==/lib/x86_64
[debug-app-helper] checking directory: `/data/user/0/com.companyname.m3/files/.__override__/lib`
[debug-app-helper] directory does not exist: `/data/user/0/com.companyname.m3/files/.__override__/lib`
[debug-app-helper] Checking whether Mono runtime exists at: /data/user/0/com.companyname.m3/files/.__override__/libmonosgen-2.0.so
[debug-app-helper] Checking whether Mono runtime exists at: /data/app/~~VJPZXjgXgUpvzaIZui6sJA==/com.companyname.m3-hjElyQLeTMNL9_qRI5s9Iw==/lib/x86_64/libmonosgen-2.0.so
[debug-app-helper] Mono runtime found at: /data/app/~~VJPZXjgXgUpvzaIZui6sJA==/com.companyname.m3-hjElyQLeTMNL9_qRI5s9Iw==/lib/x86_64/libmonosgen-2.0.so
[.companyname.m] Attempt to remove non-JNI local reference, dumping thread
[DOTNET] JNI_OnLoad: JNI_OnLoad in pal_jni.c
[monodroid] Creating public update directory: `/data/user/0/com.companyname.m3/files/.__override__`
[.companyname.m] Attempt to remove non-JNI local reference, dumping thread
[monodroid-debug] Trying to initialize the debugger with options: --debugger-agent=transport=dt_socket,loglevel=0,address=10.0.2.2:50923,embedding=1
[monodroid-assembly] open_from_bundles: failed to load assembly m3.dll
[monodroid-gc] GREF GC Threshold: 46080
[monodroid-assembly] open_from_bundles: failed to load assembly Mono.Android.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Runtime.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Java.Interop.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Runtime.InteropServices.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Collections.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Threading.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Threading.Thread.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Diagnostics.StackTrace.dll
[.companyname.m] Attempt to remove non-JNI local reference, dumping thread
[monodroid-assembly] open_from_bundles: failed to load assembly netstandard.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Linq.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.VisualStudio.DesignTools.TapContract.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.VisualStudio.DesignTools.TapContract.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.HotReload.Contracts.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.HotReload.Contracts.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Collections.Concurrent.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Text.Json.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Text.Encodings.Web.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.ComponentModel.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Maui.Controls.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.HotReload.Contracts.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.HotReload.Contracts.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.VisualStudio.DesignTools.TapContract.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.VisualStudio.DesignTools.TapContract.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.ObjectModel.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Maui.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Maui.Graphics.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Maui.Essentials.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Extensions.Logging.Abstractions.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.ComponentModel.TypeConverter.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Private.Uri.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Runtime.Loader.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Memory.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Reflection.Emit.Lightweight.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Reflection.Emit.ILGeneration.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Reflection.Primitives.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Core.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Extensions.DependencyInjection.Abstractions.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Console.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Maui.Controls.Xaml.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Extensions.Configuration.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Extensions.Configuration.Abstractions.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Extensions.Logging.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Extensions.Logging.Debug.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.AppCompat.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.Google.Android.Material.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.SwipeRefreshLayout.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Fragment.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Activity.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Lifecycle.ViewModel.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Lifecycle.Common.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.SavedState.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.DrawerLayout.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.CustomView.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Navigation.Runtime.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Net.Primitives.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Extensions.Options.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Extensions.DependencyInjection.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Diagnostics.Tracing.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Xml.ReaderWriter.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Private.Xml.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Text.Encoding.Extensions.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Numerics.Vectors.dll
[.companyname.m] Explicit concurrent copying GC freed 28343(1792KB) AllocSpace objects, 0(0B) LOS objects, 24% free, 1924KB/2565KB, paused 585us total 3.900ms
[monodroid-assembly] open_from_bundles: failed to load assembly System.Text.RegularExpressions.dll
Thread started:  #2
Thread started:  #3
Thread started:  #4
[monodroid-assembly] open_from_bundles: failed to load assembly System.Runtime.Serialization.Json.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Private.DataContractSerialization.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Runtime.Serialization.Xml.dll
[monodroid-assembly] open_from_bundles: failed to load assembly System.Runtime.Serialization.Primitives.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.RecyclerView.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.CardView.dll
[libEGL] loaded /vendor/lib64/egl/libEGL_emulation.so
[libEGL] loaded /vendor/lib64/egl/libGLESv1_CM_emulation.so
[libEGL] loaded /vendor/lib64/egl/libGLESv2_emulation.so
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Loader.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Maui.Controls.Compatibility.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Window.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.CoordinatorLayout.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Lifecycle.LiveData.Core.dll
[.companyname.m] Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
[.companyname.m] Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.ViewPager2.dll
[TabLayout] MODE_SCROLLABLE + GRAVITY_FILL is not supported, GRAVITY_START will be used instead
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Lifecycle.Runtime.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.ViewPager.dll
[monodroid-assembly] open_from_bundles: failed to load assembly CommunityToolkit.Mvvm.dll
[.companyname.m] Explicit concurrent copying GC freed 511(50KB) AllocSpace objects, 0(0B) LOS objects, 24% free, 2975KB/3967KB, paused 334us total 4.521ms
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.AppCompat.AppCompatResources.dll
Thread started: .NET Timer #5
[HostConnection] HostConnection::get() New Host Connection established 0x75558c984190, tid 12537
[HostConnection] HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV_Cache ANDROID_EMU_vulkan_ignored_handles ANDROID_EMU_has_shared_slots_host_memory_allocator ANDROID_EMU_vulkan_free_memory_sync ANDROID_EMU_vulkan_shader_float16_int8 ANDROID_EMU_vulkan_async_queue_submit ANDROID_EMU_sync_buffer_data ANDROID_EMU_read_color_buffer_dma GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_gles_max_version_3_0 
[OpenGLRenderer] Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
[EGL_emulation] eglCreateContext: 0x75557c9bb450: maj 3 min 0 rcv 3
[EGL_emulation] eglMakeCurrent: 0x75557c9bb450: ver 3 0 (tinfo 0x75551d32a860) (first time)
[Gralloc4] mapper 4.x is not supported
[HostConnection] createUnique: call
[HostConnection] HostConnection::get() New Host Connection established 0x75558c986410, tid 12537
[goldfish-address-space] allocate: Ask for block of size 0x100
[goldfish-address-space] allocate: ioctl allocate returned offset 0x3f3ffe000 size 0x2000
[HostConnection] HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV_Cache ANDROID_EMU_vulkan_ignored_handles ANDROID_EMU_has_shared_slots_host_memory_allocator ANDROID_EMU_vulkan_free_memory_sync ANDROID_EMU_vulkan_shader_float16_int8 ANDROID_EMU_vulkan_async_queue_submit ANDROID_EMU_sync_buffer_data ANDROID_EMU_read_color_buffer_dma GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_gles_max_version_3_0 
[monodroid-assembly] open_from_bundles: failed to load assembly Xamarin.AndroidX.Emoji2.dll
[monodroid-assembly] open_from_bundles: failed to load assembly Microsoft.Extensions.Primitives.dll
[0:] Microsoft.Maui.FontManager: Warning: Unable to load font 'sans-serif-medium' from assets.

Java.Lang.RuntimeException: Font asset not found sans-serif-medium
   at Java.Interop.JniEnvironment.StaticMethods.CallStaticObjectMethod(JniObjectReference type, JniMethodInfo method, JniArgumentValue* args) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/obj/Release/net7.0/JniEnvironment.g.cs:line 12890
   at Java.Interop.JniPeerMembers.JniStaticMethods.InvokeObjectMethod(String encodedMember, JniArgumentValue* parameters) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniStaticMethods.cs:line 151
   at Android.Graphics.Typeface.CreateFromAsset(AssetManager mgr, String path) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net7.0/android-33/mcw/Android.Graphics.Typeface.cs:line 613
   at Microsoft.Maui.FontManager.LoadTypefaceFromAsset(String fontfamily, Boolean warning) in D:\a\_work\1\s\src\Core\src\Fonts\FontManager.Android.cs:line 122
  --- End of managed Java.Lang.RuntimeException stack trace ---

Steps to Reproduce

above all

Link to public reproduction project repository

above all

Version with bug

7.0 (current)

Last version that worked well

7.0 (current)

Affected platforms

Android

Affected platform versions

Pixel 5 - API 30 Android 11.0

Did you find any workaround?

No response

Relevant log output

No response

About this issue

  • Original URL
  • State: closed
  • Created a year ago
  • Reactions: 8
  • Comments: 19 (4 by maintainers)

Most upvoted comments

I don’t know if it’s related, but I’m noticing right now that when built in Debug, fonts are working as expected, but when building in Release, they are not. I’m using the latest preview version.

+2
hypdeb on Jul 2, 2023

I was encountering this error, which had the added issue that I was then unable to hit breakpoints that I placed in my code for debugging in Visual Studio. The app would continue to run, but it was no longer possible to check on the state of the application to debug after the error was thrown!

Workaround:

  1. Download Open Sans Medium 500 Font from Google Fonts (Google Fonts - Open Sans)

  2. Unzip the downloaded .zip (For me: Open_Sans.zip), navigate to the unzipped folder, and copy static/OpenSans-Medium.ttf

  3. Paste the ttf file in your project under Resources/Fonts/

  4. In your MauiProgram.cs file, add the font:

[...]

public static class MauiProgram
{
	public static MauiApp CreateMauiApp()
	{
		var builder = MauiApp.CreateBuilder();
		builder
			.UseMauiApp<App>()
			.ConfigureFonts(fonts =>
			{
				// Default fonts
				fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
				fonts.AddFont("OpenSans-SemiBold.ttf", "OpenSansSemiBold");
				// Font added to address issue: https://github.com/dotnet/maui/issues/13239
				// fonts.AddFont("OpenSans-Medium.ttf", "OpenSansMedium"); !! Still throws error !!
				// Alias set to match error string
				fonts.AddFont("OpenSans-Medium.ttf", "sans-serif-medium");
			});
		[...]
	}
}

For me, on the Android Emulator, the error was no longer thrown after adding this font with the sans-serif-medium alias.

With the error no longer being thrown, I could hit my breakpoints again without issue!

+2
MDale-RAC on May 8, 2023

I am just now recently getting a similar error when debugging to android device. This had been working fine on previous versions on the same phone. Started happening on version 7.0.86. OpenSans-Semibold.tff is in the Fonts folder and the property <MauiFont Include="Resources\Fonts\*" /> is included in the csproj.

Update: seems like it was case sensitive. Changing: fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold"); to fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemiBold"); fixed it.

image

+1
gktval on May 16, 2023

I ran into the same error in my MAUI app, when running on an older Android device (OnePlus 3T running OxygenOS 9). It seems this phone does not have a built-in font with the name sans-serif-medium. The workaround suggested above (adding OpenSans-Medium.ttf aliased to sans-serif-medium) has solved the problem for me.

+1
mstefarov on May 16, 2023

Change the file name: “OpenSans-Semibold.ttf” to “opensans_semibold.ttf” (android style). Then, in MauiApp CreateMauiApp: fonts.AddFont("opensans_semibold.ttf", "OpenSansSemibold");

i have changed the font file name as what has suggested, but the problem just stay the same

here is updated git example https://github.com/yangbocheng/formauifont

+1
yangbocheng on Feb 15, 2023

repos https://github.com/yangbocheng/formauifont.git

+1
yangbocheng on Feb 13, 2023
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