问题
When I set a CoordinatorLayout as my root element I get the following error when Android Studio is rendering a preview.
java.lang.NoClassDefFoundError: Could not initialize class android.support.design.widget.CoordinatorLayout
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:413)
at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:105)
at com.android.tools.idea.rendering.LayoutlibCallback.loadView(LayoutlibCallback.java:177)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:214)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:142)
at android.view.LayoutInflater.inflate(LayoutInflater.java:482)
at android.view.LayoutInflater.inflate(LayoutInflater.java:385)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:413)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:321)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:497)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:485)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:894)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:485)
at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:590)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:644)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access$1700(AndroidLayoutPreviewToolWindowManager.java:79)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7$1.run(AndroidLayoutPreviewToolWindowManager.java:586)
at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:152)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:452)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7.run(AndroidLayoutPreviewToolWindowManager.java:581)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
at com.intellij.util.Alarm$Request$1.run(Alarm.java:351)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:695)
My layout file looks like this
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar_layout"
android:layout_width="match_parent"
android:layout_height="@dimen/detail_backdrop_height"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:id="@+id/img"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/detail_recyclerview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/appbar_layout"
android:layout_marginTop="-25dp"
android:background="@color/background_light"
android:paddingTop="36dp"
android:scrollbars="vertical"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_below="@id/appbar_layout"
android:layout_gravity="bottom|end"
android:layout_marginEnd="16dp"
android:layout_marginTop="-32dp"
android:src="@android:drawable/ic_menu_call"
app:layout_scrollFlags="scroll|exitUntilCollapsed" />
</android.support.design.widget.CoordinatorLayout>
Here is my build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 22
buildToolsVersion "21.1.2"
defaultConfig {
applicationId "com.godine"
minSdkVersion 21
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
lintOptions {
abortOnError false
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:cardview-v7:22.2.0'
compile 'com.android.support:recyclerview-v7:22.2.0'
compile 'com.android.support:design:22.2.0'
compile 'com.android.support:appcompat-v7:22.2.0'
...
}
Does anyone have an idea what might be wrong here?
Edit As @deniz already mentioned in an answer the preview works with the newest update of the Android Studio
回答1:
This is a known issue in the Android Open Source Project Issue Tracker:
https://code.google.com/p/android/issues/detail?id=175595
The unfortunate workaround described by the Android project member is:
Workarounds: Try rendering with M preview using AS v1.3 preview OR use
FrameLayoutfor designing and change toandroid.support.design.widget.CoordinatorLayoutwhile debugging.
回答2:
Update android studio to latest version (beta) 1.3 beta version.Menu -> 'Check for updates'
If you are not able to find the beta update change android studio settings(Updates), then update that patch and render with M preview
Try Renderring your preview using Android M preview.
回答3:
I solved the similar error of android...coordinatorlayout that appear instead of the preview of android app by:
1- Close the project
2- Restart the android studio
3- Build the project
May be it will help someone.
回答4:
Wait! Do not switch to beta channel.
As of July 29, Android Studio 1.3 has been released on stable channel. I checked, and can confirm that the new version of the IDE completely addresses your issue in question with CoordinatorLayout rendering.
Android Studio 1.3 is not yet published on the Android website, nonetheless, you can upgrade your Android Studio from 1.2 to 1.3 by downloading the update patch through the IDE menu. Simply click on:
Help --> Check for Update --> Update and Restart
P.S. You do not need Android M to render either. Lower APIs work just as well.
回答5:
I had similar problem with AppBarLayout, it seems IDE cached some wrong version of widget.
File -> Invalidate Caches/Restart helped me.
回答6:
I ran into this problem again myself.
I ran clean project -> restart android studio -> build again and it worked for me.
I assume Android Studio had some weird cache with AndroidX and the old support library.
10/10 good build tools.
回答7:
I faced this issue after updating to Android Studio 4.0.1 and solved it by disabling Experimental Layout Rendering Engine and restarting Android Studio. do as this to solve:
go to File->Settings->Experimental->Editor-> and uncheck the Use new Layout Rendering Engine then hit OK and restart Android Studio. you should find it working seamlessly
hope this solution helps someone.
来源：https://stackoverflow.com/questions/30852844/android-studio-rendering-problems-with-coordinatorlayout