参考：https://blog.csdn.net/lvshuchangyin/article/details/53785494
导入第三方库的时候出现的问题
Error:Error converting bytecode to dex: Cause: com.android.dex.DexException: Multiple dex files define Lcom/alibaba/android/arouter/routes/ARouter$$Group$$user; Error:com.android.dex.DexException: Multiple dex files define Lcom/alibaba/android/arouter/routes/ARouter$$Group$$user; Error: at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:661) Error: at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:616) Error: at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:598) Error: at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171) Error: at com.android.dx.merge.DexMerger.merge(DexMerger.java:198) Error: at com.android.builder.dexing.DexArchiveMergerCallable.call(DexArchiveMergerCallable.java:61) Error: at com.android.builder.dexing.DexArchiveMergerCallable.call(DexArchiveMergerCallable.java:36) Error: at java.util.concurrent.ForkJoinTask$AdaptedCallable.exec(ForkJoinTask.java:1424) Error: at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) Error: at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) Error: at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) Error: at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) Error:Execution failed for task ':app:transformDexArchiveWithDexMergerForDebug'. > com.android.build.api.transform.TransformException: com.android.dex.DexException: Multiple dex files define Lcom/alibaba/android/arouter/routes/ARouter$$Group$$user;解决方法：
在build.gradle里添加设置(如果使用模块化开发，在主模块的build.gradle添加)：
defaultConfig { ... //Enabling multidex support. multiDexEnabled true } dependencies { ... compile 'com.android.support:multidex:1.0.1' }