字体家族导致安卓26上的NPE

问题描述：

我的应用在android 26上崩溃，我的理解是它是由font-family和支持库引起的，但我无法弄清楚原因。在Android 8.0以下的设备上工作正常。字体家族导致安卓26上的NPE

Caused by: android.view.InflateException: Binary XML file line #0: Error inflating class Button 
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException 
at android.support.v4.graphics.TypefaceCompatApi26Impl.addFontFromAssetManager(TypefaceCompatApi26Impl.java:150) 
at android.support.v4.graphics.TypefaceCompatApi26Impl.createFromFontFamilyFilesResourceEntry(TypefaceCompatApi26Impl.java:218) 
at android.support.v4.graphics.TypefaceCompat.createFromResourcesFamilyXml(TypefaceCompat.java:116) 
at android.support.v4.content.res.ResourcesCompat.loadFont(ResourcesCompat.java:249) 
at android.support.v4.content.res.ResourcesCompat.loadFont(ResourcesCompat.java:213) 
at android.support.v4.content.res.ResourcesCompat.getFont(ResourcesCompat.java:206) 
at android.support.v7.widget.TintTypedArray.getFont(TintTypedArray.java:119) 
at android.support.v7.widget.AppCompatTextHelper.updateTypefaceAndStyle(AppCompatTextHelper.java:208) 
at android.support.v7.widget.AppCompatTextHelper.loadFromAttributes(AppCompatTextHelper.java:152) 
at android.support.v7.widget.AppCompatTextHelperV17.loadFromAttributes(AppCompatTextHelperV17.java:38) 
at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:77) 
at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:67) 
at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:109) 
at android.support.v7.app.AppCompatDelegateImplV9.createView(AppCompatDelegateImplV9.java:1024) 
at android.support.v7.app.AppCompatDelegateImplV9.onCreateView(AppCompatDelegateImplV9.java:1081) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:772) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:866) 
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:515) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:374) 
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287) 
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139) 
Caused by: java.lang.reflect.InvocationTargetException 
at java.lang.reflect.Method.invoke(Native Method) 
at android.support.v4.graphics.TypefaceCompatApi26Impl.addFontFromAssetManager(TypefaceCompatApi26Impl.java:145) 
... 42 more 
Caused by: java.lang.NullPointerException 
at android.graphics.FontFamily.nAddFontFromAssetManager(Native Method) 
at android.graphics.FontFamily.addFontFromAssetManager(FontFamily.java:149) 
... 44 more

答

通过只使用的xmlns：应用程序是为Android V26

<font 
    app:font="@font/cuprum_regular" 
    app:fontStyle="normal" 
    app:fontWeight="400"/>

答

工作从Fonts in XML docs

的Support Library 26.0提供support于运行Android API version 14 and higher设备Fonts in XML功能。

When you declare font families in XML layout through the support library, use the app namespace.

由于您的应用支持的API 14，所以你必须使用app命名空间，而不是android

答

我使用支持库版本27.0.1我当我使用可下载的字体时，在Android Oreo上发生了完全相同的崩溃https://developer.android.com/guide/topics/ui/look-and-feel/downloadable-fonts.html
而不是使用可下载的字体，我只是从谷歌字体网站下载字体，并将它们放在res \ fonts目录中。字体家族xml文件保持不变。我测试过它，它在所有Android版本上都有。这是一个错误，或者我没有正确设置可下载字体，即使我使用内置向导来添加新字体。

字体家族导致安卓26上的NPE

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