xml - Android Studio: android.support.v7.widget.Toolbar can not be initiated -

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i developing toolbar android app , after creating tool_bar.xml file, ide showing error following classes can not initiated - android.support.v7.widget.toolbar

enter image description here

the full error details are

java.lang.noclassdeffounderror: android/support/v7/appcompat/r$attr     @ android.support.v7.widget.toolbar.<init>(toolbar.java:191)     @ sun.reflect.nativeconstructoraccessorimpl.newinstance0(native method)     @ sun.reflect.nativeconstructoraccessorimpl.newinstance(nativeconstructoraccessorimpl.java:57)     @ sun.reflect.delegatingconstructoraccessorimpl.newinstance(delegatingconstructoraccessorimpl.java:45)     @ java.lang.reflect.constructor.newinstance(constructor.java:526)     @ org.jetbrains.android.uipreview.viewloader.createnewinstance(viewloader.java:413)     @ org.jetbrains.android.uipreview.viewloader.loadview(viewloader.java:105)     @ com.android.tools.idea.rendering.layoutlibcallback.loadview(layoutlibcallback.java:177)     @ android.view.bridgeinflater.loadcustomview(bridgeinflater.java:214)     @ android.view.bridgeinflater.createviewfromtag(bridgeinflater.java:142)     @ android.view.layoutinflater.inflate(layoutinflater.java:482)     @ android.view.layoutinflater.inflate(layoutinflater.java:385)     @ com.android.layoutlib.bridge.impl.rendersessionimpl.inflate(rendersessionimpl.java:413)     @ com.android.layoutlib.bridge.bridge.createsession(bridge.java:321)     @ com.android.ide.common.rendering.layoutlibrary.createsession(layoutlibrary.java:350)     @ com.android.tools.idea.rendering.rendertask$2.compute(rendertask.java:497)     @ com.android.tools.idea.rendering.rendertask$2.compute(rendertask.java:485)     @ com.intellij.openapi.application.impl.applicationimpl.runreadaction(applicationimpl.java:894)     @ com.android.tools.idea.rendering.rendertask.createrendersession(rendertask.java:485)     @ com.android.tools.idea.rendering.rendertask.render(rendertask.java:590)     @ com.intellij.android.designer.designsurface.androiddesignereditorpanel$6.run(androiddesignereditorpanel.java:480)     @ com.intellij.util.ui.update.mergingupdatequeue.execute(mergingupdatequeue.java:320)     @ com.intellij.util.ui.update.mergingupdatequeue.execute(mergingupdatequeue.java:310)     @ com.intellij.util.ui.update.mergingupdatequeue$2.run(mergingupdatequeue.java:254)     @ com.intellij.util.ui.update.mergingupdatequeue.flush(mergingupdatequeue.java:269)     @ com.intellij.util.ui.update.mergingupdatequeue.flush(mergingupdatequeue.java:227)     @ com.intellij.util.ui.update.mergingupdatequeue.run(mergingupdatequeue.java:217)     @ com.intellij.util.concurrency.queueprocessor.runsafely(queueprocessor.java:238)     @ com.intellij.util.alarm$request$1.run(alarm.java:351)     @ java.util.concurrent.executors$runnableadapter.call(executors.java:471)     @ java.util.concurrent.futuretask.run(futuretask.java:262)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)     @ java.lang.thread.run(thread.java:745)

my tool_bar.xml file is:

<?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.toolbar xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent" android:layout_height="match_parent">  </android.support.v7.widget.toolbar>

anyone has idea why happening? have tried invalidating cache , rebuilding , cleaning project, , failed. switch api version didn't worked out.

probably need set app theme inherit theme.appcompat theme.

edit: if have imported more support things add it:

compile ('com.android.support:recyclerview-v7:22.2.0') {     exclude module: 'support-v7' } compile ('com.android.support:cardview-v7:22.2.0') {     exclude module: 'support-v7' } compile 'com.android.support:appcompat-v7:22.2.0'

it prevent importing wrong version of support library other libs. check if support libs have same version.


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