本文介绍了无法使用 android.support.v7.widget.AppCompatTextView 实例化以下类的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
最近我在 android studio 的应用程序中将我的 sdk 从 25 更改为 26，我的所有 xml 中都出现这个奇怪的错误.目前，该错误并未以我能看到的任何方式影响我的应用程序，但是每次我必须编辑或更改 xml 中的某些内容时都会很烦人.这里的错误:
Recently i changed my sdk from 25 to 26 in my app in android studio, i'm getting this weird error in all my xml. At the moment the error is not afecting my app in any way i can see, but is anoying to see every time i have to edit or change something in the xml.The error here:
无法实例化以下类 - android.support.v7.widget.AppCompatTextView
the following classes could not be instantiated - android.support.v7.widget.AppCompatTextView
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$2.compute(RenderTask.java:567)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:549)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:863)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:549)
at com.android.tools.idea.rendering.RenderTask.lambda$inflate$1(RenderTask.java:680)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
还有我的毕业证书:
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion "26.0.1"
defaultConfig {
applicationId "com.al285790.time2cook"
minSdkVersion 15
targetSdkVersion 26
multiDexEnabled true
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:26.0.1'
compile 'com.android.support:palette-v7:26.0.1'
compile 'com.android.support:design:26.0.1'
compile 'com.google.firebase:firebase-database:11.0.2'
compile 'com.google.firebase:firebase-core:9.6.1'
compile 'com.google.firebase:firebase-storage:11.0.2'
compile 'com.google.firebase:firebase-auth:11.0.2'
compile 'com.github.bumptech.glide:glide:3.7.0'
compile 'com.firebaseui:firebase-ui-storage:1.2.0'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
compile('com.mikepenz:materialdrawer:5.9.5@aar') {
transitive = true
}
testCompile 'junit:junit:4.12'
}
apply plugin: 'com.google.gms.google-services'
添加了一些我的 xml 代码
Added some of my xml code
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"></android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="android.support.design.widget.AppBarLayout$ScrollingViewBehavior">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.al285790.time2cook.recipeInfo.RecipeInfoActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:scrollbars="none">
<TextView
android:id="@+id/recipeNameText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="24sp"
android:textStyle="bold" />
<ImageView
android:id="@+id/photoRecipe"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitCenter"
app:srcCompat="@drawable/cho" />
<TextView
android:id="@+id/textView10"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Dificulty"
android:textSize="24sp"
android:textStyle="bold" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<RatingBar
android:id="@+id/ratingBarDificulty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:isIndicator="true"
android:numStars="5"
android:stepSize="1" />
<Button
android:id="@+id/button8"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="giveLike"
android:text="LIKE!" />
</LinearLayout>
<TextView
android:id="@+id/Ingredients"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Ingredients"
android:textSize="24sp"
android:textStyle="bold" />
<android.support.v7.widget.RecyclerView
android:id="@+id/superList"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/textView9"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Steps"
android:textSize="24sp"
android:textStyle="bold" />
<android.support.v7.widget.RecyclerView
android:id="@+id/stepsList"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>
推荐答案
我也遇到了这个错误，并试图通过多次清理、重建和使缓存失效来修复它.为我修复的是将 res/values/styles.xml 中的父主题更改为带有 Base 的父主题，例如
I was getting this error too and tried to fix it by cleaning, rebuilding and invalidating the cache many times.What fixed it for me was changing the parent theme in res/values/styles.xml to one with Base e.g.
根据答案此处.
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