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今天在写程序的时候我的Android Studio 突然编译错误（错误提示如下：）后来经过我的几番折腾发现每一次都要先Clear Project一下然后再Build就可以了，如果你第二次再Build的时候就报错。后来我就找到了最强的老师（Google）尝试解决！可惜很遗憾，我在Google上看到的都是Eclipse上的解决方法。并没有找到我想要的答案，难道要我每一次在Build的时候都要先Clear Project吗？最后又经过我的几番折腾我发现在Project Structure--->app--->Properties中有一个选项叫：Incremental Dex (增加的DEX)的值为True,我又新建了一个项目发现默认值是空值，果然把这个改成空值问题就全然解决了！虽然现在我也不知道这一个选项到底是有什么用。
错误提示：
Information:Gradle tasks [:app:assembleDebug] :app:preBuild UP-TO-DATE :app:preDebugBuild UP-TO-DATE :app:checkDebugManifest :app:preReleaseBuild UP-TO-DATE :app:prepareComAndroidSupportAnimatedVectorDrawable2330Library UP-TO-DATE :app:prepareComAndroidSupportAppcompatV72330Library UP-TO-DATE :app:prepareComAndroidSupportSupportV42330Library UP-TO-DATE :app:prepareComAndroidSupportSupportVectorDrawable2330Library UP-TO-DATE :app:prepareDebugDependencies :app:compileDebugAidl UP-TO-DATE :app:compileDebugRenderscript UP-TO-DATE :app:generateDebugBuildConfig UP-TO-DATE :app:generateDebugAssets UP-TO-DATE :app:mergeDebugAssets UP-TO-DATE :app:generateDebugResValues UP-TO-DATE :app:generateDebugResources UP-TO-DATE :app:mergeDebugResources UP-TO-DATE :app:processDebugManifest UP-TO-DATE :app:processDebugResources UP-TO-DATE :app:generateDebugSources UP-TO-DATE :app:processDebugJavaRes UP-TO-DATE :app:compileDebugJavaWithJavac :app:compileDebugNdk UP-TO-DATE :app:compileDebugSources :app:preDexDebug UP-TO-DATE :app:dexDebug UNEXPECTED TOP-LEVEL EXCEPTION: com.android.dex.DexException: Multiple dex files define Landroid/support/v7/app/ActionBar$DisplayOptions; at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:591) at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:546) at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:528) at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:164) at com.android.dx.merge.DexMerger.merge(DexMerger.java:188) at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:504) at com.android.dx.command.dexer.Main.runMonoDex(Main.java:334) at com.android.dx.command.dexer.Main.run(Main.java:277) at com.android.dx.command.dexer.Main.main(Main.java:245) at com.android.dx.command.Main.main(Main.java:106) Error:Execution failed for task ‘:app:dexDebug‘. > com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException:
Process ‘command ‘C:\Program Files\Java\jdk1.8.0_73\bin\java.exe‘‘ finished with non-zero exit value 2
解决方法：
Android 多个DEX错误 Multiple dex files define Landroid/support/v7/app/ActionBar$DisplayOptions;
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原文地址：http://www.cnblogs.com/sunnypei/p/5824190.html
