Java &引用；无法实例化ConstraintLayout"；渲染时

我将Maven与android Maven插件一起使用，作为android开发的构建工具。我试图在我的项目中使用

ConstraintLayout

。 在my

pom.xml

中，我有：

<repository>
                <id>google</id>
                <url>https://maven.google.com</url>
</repository>

<dependency>
            <groupId>com.android.support.constraint</groupId>
            <artifactId>constraint-layout</artifactId>
            <version>1.0.2</version>
            <type>aar</type>
</dependency>

---

有同样的问题，你解决了吗？顺便说一句，我尝试了一些不同的版本，但没有成功：（我遇到了同样的问题，首先constraintlayout是在库模块的

build.gradle

文件中导入的。当我将它移动到应用程序的

build.gradle

文件中时，它工作正常，希望能帮助你！

 Rendering Problems The following classes could not be instantiated:
- android.support.constraint.ConstraintLayout 

java.lang.NoClassDefFoundError: android/support/constraint/R$styleable
    at android.support.constraint.ConstraintLayout.init(ConstraintLayout.java:440)
    at android.support.constraint.ConstraintLayout.<init>(ConstraintLayout.java:420)
    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:465)
    at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:172)
    at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:105)
    at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:186)
    at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:334)
    at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:345)
    at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:245)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:324)
    at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)
    at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:389)
    at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:548)
    at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:533)
    at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:946)
    at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:533)
    at com.android.tools.idea.rendering.RenderTask.lambda$inflate$1(RenderTask.java:659)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)