最近使用Android Studio做專案時，忽然出現以下錯誤
Information:Gradle tasks [:app:assembleDebug]
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72300Library UP-TO-DATE
:app:prepareComAndroidSupportCardviewV72321Library UP-TO-DATE
:app:prepareComAndroidSupportCustomtabs2321Library UP-TO-DATE
:app:prepareComAndroidSupportDesign2300Library UP-TO-DATE
:app:prepareComAndroidSupportMediarouterV72300Library UP-TO-DATE
:app:prepareComAndroidSupportPaletteV72320Library UP-TO-DATE
:app:prepareComAndroidSupportRecyclerviewV72320Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42321Library UP-TO-DATE
:app:prepareComFacebookAndroidFacebookAndroidSdk4110Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServices840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesAds840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesAnalytics840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesAppindexing840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesAppinvite840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesAppstate840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesAuth840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesBase840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesBasement840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesCast840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesDrive840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesFitness840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesGames840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesGcm840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesIdentity840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesLocation840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesMaps840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesMeasurement840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesNearby840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesPanorama840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesPlus840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesSafetynet840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesVision840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesWallet840Library UP-TO-DATE
:app:prepareComGoogleAndroidGmsPlayServicesWearable840Library UP-TO-DATE
:app:prepareComSeachaosHurryporter017Library UP-TO-DATE
:app:prepareEnjoyTpcclientUnspecifiedLibrary 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
AAPT: /Users/****/cafe3.png: libpng warning: iCCP: Not recognizing known sRGB profile that has been edited
AAPT: /Users/****/cafe2.png: libpng warning: iCCP: Not recognizing known sRGB profile that has been edited
AAPT: /Users/****/cafe1.png: libpng warning: iCCP: Not recognizing known sRGB profile that has been edited
:app:processDebugManifest
:app:processDebugResources
:app:generateDebugSources
:app:compileDebugJavaWithJavac
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
:app:compileDebugNdk UP-TO-DATE
:app:compileDebugSources
:app:transformClassesWithDexForDebug
UNEXPECTED TOP-LEVEL EXCEPTION:
Error:Execution failed for task ':app:transformClassesWithDexForDebug'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/Library/Java/JavaVirtualMachines/jdk1.8.0_73.jdk/Contents/Home/bin/java'' finished with non-zero exit value 2
我只不過是監聽了我的Button事件(setOnClickListener)，沒有做其他任何事，真讓我搞不懂到底這IDE是發生了什麼事！！
後來查到只要在 build.gradle(Module: app)中的android{}底下的defaultConfig{}裡面加上multiDexEnabled true
就可以正確運行了。
不過，這好像不是唯一個解決辦法，而且加入這行會使得每次在build的時候花費很多時間。經過爬文之後發現，原來是method只要大於65k就會有這情況發生，這些method不只是我們自己寫的method，就連你improt的也算喔～～
所以只好到build.gradle(Module: app)中的android{}底下的dependencies{}中，找出根本沒有使用到的library將它移除，這情況就可以解決了。
如果每個library都有用到，那只好整理一下你的code吧！
