Import your own Write jar file in Android Project Discovery cannot be packaged into the APK file

Today, when I write a project, I import a jar file that I wrote, and I can't find the jar file error when I debug it:

08-06 21:42:10.744:e/androidruntime (2578): java.lang.RuntimeException:Unable to instantiate activity componentinfo{ Com.example.iotlife/com.example.iotlife.mainactivity}: Java.lang.ClassNotFoundException:Didn ' t find class " Com.example.iotlife.MainActivity "on Path:dexpathlist[[zip file"/data/app/com.example.iotlife-1.apk "], Nativelibrarydirectories=[/data/app-lib/com.example.iotlife-1,/system/lib]]
Search on the Internet a lot of solutions are not resolved, and finally directly copied the jar file to the Android Project Libs file, the final problem solved

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Import your own Write jar file in Android Project Discovery cannot be packaged into the APK file