在手机和模拟器上一切正常，但我无法在 Android Studio 中使用布局编辑器，因为我收到以下错误：
无法实例化以下类：
- android support.v7.widget.Toolbar（打开类，显示异常，清除缓存）
我在另一个布局中使用 ConstraintLayout 得到的相同。
异常详情：
java.lang.NegativeArraySizeException
at android.support.v7.appcompat.R$styleable.<clinit>(Unknown Source)
at android.support.v7.widget.Toolbar.<init>(Toolbar.java:235)
at android.support.v7.widget.Toolbar.<init>(Toolbar.java:228)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:481)
at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:264)
at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:222)
at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:211)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:337)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:348)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:248)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:394)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:325)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:384)
at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:193)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:547)
at com.android.tools.idea.rendering.RenderTask.lambda$inflate$3(RenderTask.java:681)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
想象一下它的样子：
我的工具栏布局 XML：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/toolbar"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="?attr/toolbarTheme"
app:popupTheme="?attr/toolbarPopupTheme"/>
“支持库”的 Gradle：
// Support Library
implementation "com.android.support:support-core-utils:${supportLibVersion}"
implementation "com.android.support:appcompat-v7:${supportLibVersion}"
implementation "com.android.support:gridlayout-v7:${supportLibVersion}"
implementation "com.android.support:cardview-v7:${supportLibVersion}"
implementation "com.android.support:design:${supportLibVersion}"
implementation "com.android.support:recyclerview-v7:${supportLibVersion}"
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
supportLibVersion = '27.0.2'
我使用 Android Studio 3.0.1版！
我已经完成并在其他 StackOverflow 线程中发现了什么：
- 无效缓存和重新启动
- 清理项目和重建项目
- 我使用的主题从父级“Theme.AppCompat”更改为“Base.Theme.AppCompat”