今天在開發(fā)過程中遇到一個大問題，在切換到android studio布局頁面的時候會出現(xiàn)白屏，無法顯示出具體控件，但是當(dāng)我切換到其他project的時候一切顯示正常，比較蛋疼，先貼異常代碼：?

1、Failed to instantiate one or more classes

Rendering failed with a known bug. Please try a rebuild. The following classes could not be instantiated: - android.support.v7.widget.Toolbar (Open Class, Show Exception, Clear Cache) - android.support.v7.internal.app.WindowDecorActionBar (Open Class, Show Exception, Clear Cache)Tip: Use View.isInEditMode() in your custom views to skip code or show sample data when shown in the IDE. If this is an unexpected error you can also try to build the project, then manually refresh the layout. Exception Details java.lang.NoSuchFieldError: Toolbar_buttonGravity at android.support.v7.widget.Toolbar.<init>(Toolbar.java:231) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 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.rInflateChildren(LayoutInflater.java:821) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:861) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70) at android.view.LayoutInflater.rInflate(LayoutInflater.java:834) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821) at android.view.LayoutInflater.inflate(LayoutInflater.java:518) at android.view.LayoutInflater.inflate(LayoutInflater.java:426) at com.android.layoutlib.bridge.bars.BridgeActionBar.<init>(BridgeActionBar.java:84) at com.android.layoutlib.bridge.bars.AppCompatActionBar.<init>(AppCompatActionBar.java:59) at com.android.layoutlib.bridge.impl.Layout.createActionBar(Layout.java:241) at com.android.layoutlib.bridge.impl.Layout.<init>(Layout.java:153) Copy stack to clipboard

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2、can’t make a decor toolbar out of MockView?
onMeasure error (Details)?
Details:

java.lang.IllegalStateException: Can't make a decor toolbar out of MockView at android.support.v7.internal.widget.ActionBarOverlayLayout.getDecorToolbar(ActionBarOverlayLayout.java:542) at android.support.v7.internal.widget.ActionBarOverlayLayout.pullChildren(ActionBarOverlayLayout.java:532) at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure_Original(ActionBarOverlayLayout.java:331) at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java) at android.view.View.measure(View.java:19734) at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715) at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) at android.view.View.measure(View.java:19734) at com.android.layoutlib.bridge.impl.RenderSessionImpl.measureView(RenderSessionImpl.java:589) at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:342) 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)

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Tip: Try to refresh the layout.

3、Render problem

Couldn't resolve resource @id/etView

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Tip: Try to refresh the layout.

顯示錯誤圖?

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顯示正確圖?

主要將上方紅色框框內(nèi)的AppThene調(diào)整為NoTitleBar即可。

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