Java Android 无法实例化一个或多个类
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Android Failed to instantiate one or more classes
提问by Amir Khan
I have a running project and all the xml files are showing me the error message Android Failed to instantiate one or more classes. The program still works.
我有一个正在运行的项目，所有 xml 文件都向我显示错误消息Android Failed to instantiate one or more classes。该程序仍然有效。
I cleaned the cache and used invalidate Caches and Restart.
我清理了缓存并使用了无效缓存和重新启动。
Here the Full message:
这里是完整的消息：
The following classes could not be instantiated android.support.v7.widget.AppCompatTextView
无法实例化以下类 android.support.v7.widget.AppCompatTextView
Tip: Use View.isInEditMode() in your custom view to skip code or show sample data when shown in the IDE.
提示：在自定义视图中使用 View.isInEditMode() 可以跳过代码或在 IDE 中显示示例数据。
java.lang.NullPointerException
at android.content.res.Resources_Delegate.getValue(Resources_Delegate.java:788)
at android.content.res.Resources.getValue(Resources.java:1286)
at android.support.v4.content.res.ResourcesCompat.loadFont(ResourcesCompat.java:212)
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.AppCompatTextView.<init>(AppCompatTextView.java:81)
at android.support.v7.widget.AppCompatTextView.<init>(AppCompatTextView.java:71)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:475)
at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:250)
at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:213)
at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadClass(LayoutlibCallbackImpl.java:193)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:333)
at android.view.BridgeInflater.onCreateView(BridgeInflater.java:152)
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:717)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:785)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:222)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:858)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:834)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at com.android.layoutlib.bridge.bars.CustomBar.<init>(CustomBar.java:95)
at com.android.layoutlib.bridge.bars.StatusBar.<init>(StatusBar.java:67)
at com.android.layoutlib.bridge.impl.Layout.createStatusBar(Layout.java:224)
at com.android.layoutlib.bridge.impl.Layout.<init>(Layout.java:146)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:301)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:368)
at com.android.tools.idea.rendering.RenderTask.compute(RenderTask.java:567)
at com.android.tools.idea.rendering.RenderTask.compute(RenderTask.java:549)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:863)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:549)
at com.android.tools.idea.rendering.RenderTask.lambda$inflate(RenderTask.java:680)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
采纳答案by vinod
In styles.xml,
在styles.xml，
Changing the theme from Theme.AppCompat.Light.DarkActionBarto Base.Theme.AppCompat.Light.DarkActionBarhas worked for me.
改变从主题Theme.AppCompat.Light.DarkActionBar到Base.Theme.AppCompat.Light.DarkActionBar已为我工作。
回答by Harshit Agrawal
Finally, after 4 days of facing the same error I resolved this on my own:
最后，在面对同样的错误 4 天后，我自己解决了这个问题：
Click on
点击
Build--> Make Build
构建--> 进行构建
and then
进而
Refresh the layout.
刷新布局。
回答by user9974554
In the build.gradle(Module: app) change the implementation of appcompatto a previous version by searching the developer.google
在build.gradle(Module: app) 中appcompat，通过搜索developer.google
This is an error in the android framework usually happens in the alpha and beta appcompat versions.
这是 android 框架中的错误，通常发生在 alpha 和 beta appcompat 版本中。
Hope this helps.
希望这可以帮助。
