AdroidStudio 升级到3.4.1后创建的新项目 ，运行到真机上后出现此错误！
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.MainActivity" on path: DexPathList[[zip file "/data/app/com.example-ApY0Iyi_QboMUneBb1LZSA==/base.apk"],nativeLibraryDirectories=[/data/app/com.example-ApY0Iyi_QboMUneBb1LZSA==/li
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