真机运行，程序一打开就报异常解决办法

真机运行，程序一打开就报异常，所报的异常如下：

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.papa.auction2/com.papa.auction.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.papa.auction.MainActivity" on path: DexPathList[[zip file "/data/app/com.papa.auction2-1/base.apk", zip file "/data/app/com.papa.auction2-1/split_lib_slice_8_apk.apk"],nativeLibraryDirectories=[/data/app/com.papa.auction2-1/lib/arm64, /vendor/lib64, /system/lib64]]
...
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.papa.auction.MainActivity" on path: DexPathList[[zip file "/data/app/com.papa.auction2-1/base.apk", zip file "/data/app/com.papa.auction2-1/split_lib_slice_8_apk.apk"],nativeLibraryDirectories=[/data/app/com.papa.auction2-1/lib/arm64, /vendor/lib64, /system/lib64]]
...
	Suppressed: java.lang.NoClassDefFoundError: com.papa.auction.MainActivity
...
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

如果你也遇到类似这种问题可以试一下：

1.点击Android studio上的build 

2.再点击rebuild project

3.编译成功后再运行一次项目

就可以啦