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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)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)	at dalvik.system.NativeStart.main(Native Method)