.NET MAUI
A Microsoft open-source framework for building native device applications spanning mobile, tablet, and desktop.
4,086 questions
In Maui code I am getting a missing font message but I do not have code that mentions that font
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(224.00000000000003, 55.00000000000001%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EWA%3C/text%3E%3C/svg%3E)
Will Autio
5
Reputation points
In a Maui app being converted from Xamarin Forms testing on an Android,
I am getting this error message and do not know where it comes from:
java.lang.RuntimeException: Font asset not found /data/user/0/ /cache/Maui Material Assets.ttf
I make no reference to the font Maui Material Assets.ttf. I suspect there is some nuget or other addon that uses Maui Material Assets.ttf and has not included it - or has not indicated that it is needed.
Any insight is appreciated
.NET MAUI
{count} vote
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Will Autio 5 Reputation points
2023-08-03T17:09:31.3866667+00:00 Here is more of the context for the error message that I am getting:
Java.Lang.RuntimeException: Font asset not found /data/user/0/com.company.app/cache/Maui Material Assets.ttf 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 --- java.lang.RuntimeException: Font asset not found /data/user/0/com.company.app/cache/Maui Material Assets.ttf at android.graphics.Typeface.createFromAsset(Typeface.java:1155) at crc649ff77a65592e7d55.TabbedPageManager_Listeners.n_onPageSelected(Native Method) at crc649ff77a65592e7d55.TabbedPageManager_Listeners.onPageSelected(TabbedPageManager_Listeners.java:38) at androidx.viewpager2.widget.CompositeOnPageChangeCallback.onPageSelected(CompositeOnPageChangeCallback.java:73) at androidx.viewpager2.widget.CompositeOnPageChangeCallback.onPageSelected(CompositeOnPageChangeCallback.java:73) at androidx.viewpager2.widget.ScrollEventAdapter.dispatchSelected(ScrollEventAdapter.java:432) at androidx.viewpager2.widget.ScrollEventAdapter.notifyProgrammaticScroll(ScrollEventAdapter.java:320) at androidx.viewpager2.widget.ViewPager2.setCurrentItemInternal(ViewPager2.java:652) at androidx.viewpager2.widget.ViewPager2.setCurrentItem(ViewPager2.java:607) at crc649ff77a65592e7d55.TabbedPageManager_Listeners.n_onTabSelected(Native Method) at crc649ff77a65592e7d55.TabbedPageManager_Listeners.onTabSelected(TabbedPageManager_Listeners.java:54) at com.google.android.material.tabs.TabLayout.dispatchTabSelected(TabLayout.java:1907) at com.google.android.material.tabs.TabLayout.selectTab(TabLayout.java:1900) at com.google.android.material.tabs.TabLayout.selectTab(TabLayout.java:1860) at com.google.android.material.tabs.TabLayout$Tab.select(TabLayout.java:2303) at com.google.android.material.tabs.TabLayout$TabView.performClick(TabLayout.java:2493) at android.view.View.performClickInternal(View.java:7869) at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0) at android.view.View$PerformClick.run(View.java:30880) at android.os.Handler.handleCallback(Handler.java:942) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loopOnce(Looper.java:226) at android.os.Looper.loop(Looper.java:313) at android.app.ActivityThread.main(ActivityThread.java:8757) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067) -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(310.4, 6%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELL%3C/text%3E%3C/svg%3E)
Leon Lu (Shanghai Wicresoft Co,.Ltd.) 81,191 Reputation points Microsoft External Staff2023-08-04T08:34:53.6466667+00:00 Firstly, please Close your VS and delete bin and obj folder, then uninstall application in your android device or emulator.
After that, rebuild your application, if have similar issue.
How did you migrate to the MAUI? By .NET Upgrade Assistant or manually.
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Will Autio 5 Reputation points
2023-08-11T17:29:55.8833333+00:00 @Leon Yu Thanks for your reply. That seemed to do it.
We used the .NET Upgrade Assistant and then manually started to fix all the things that were not covered like Syncfusion controls, differences between XF controls and Maui ones, deprecated and obsoleted items...
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Leon Lu (Shanghai Wicresoft Co,.Ltd.) 81,191 Reputation points Microsoft External Staff
2023-08-14T06:38:11.9+00:00 You have migrated your Xamarin project to MAUI project manually like this document:Manually upgrade a Xamarin.Forms app to .NET MAUI After that, you still get
Java.Lang.RuntimeException: Font asset not found /data/user/0/com.company.app/cache/Maui Material Assets.ttferror, am I right? -
Will Autio 5 Reputation points
2023-08-25T05:11:12.12+00:00 I'm back. So is the same bug.
First, to answer your question from Aug 13. We did the "automatic upgrade routine" and then continued by trying to fix all the leftover bugs and error messages and obsolete messages, etc.
Today I'm back in the code that exhibited the above mentioned bug. However, this time after deleting the bin and obj directories, uninstall the app, build and run which redeploys the app, I get this error again.
Any idea what is trying to use "Maui Material Assets.ttf"?
The long stack trace seems to belong to Android and starts with:
"at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)"
Thanks for looking at this.
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Leon Lu (Shanghai Wicresoft Co,.Ltd.) 81,191 Reputation points Microsoft External Staff
2023-09-01T07:26:00.9433333+00:00 For your scenario, it is recommended to open a support ticket for this. Please contact our paid phone support at MS Support. You will get 1:1 support on that.
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