FAQ: Android app 编译好后安装到手机，运行时闪退，报如下错误：
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{io.grpc.helloworldexample/io.grpc.helloworldexample.HelloworldActivity}: java.lang.ClassNotFoundException: Didn't find class "io.grpc.helloworldexample.HelloworldActivity" on path: DexPathList[[zip file "/data/app/io.grpc.helloworldexample-aHJfGmXKi-KoAnqDIRZHhQ==/base.apk"],nativeLibraryDirectories=[/data/app/io.grpc.helloworldexample-aHJfGmXKi-KoAnqDIRZHhQ==/lib/arm64, /system/lib64, /vendor/lib64]]java
