java.lang.ClassCastException: java.lang.String cannot be cast to com.example.demoapp.device.Dev

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java.lang.String cannot be cast to com.example.demoapp.device.Dev
java.lang.ClassCastException: java.lang.String cannot be cast to com.example.demoapp.device.Dev
at com.example.demoapp.MainActivity$MyHandler.handleMessage(MainActivity.java:177)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5140)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)

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