Eclipse can’t see my Android Device on Window.Previously I had been working fine

Eclipse can’t see my Android Device on Window.Previously I had been working fine.Suddenly I got This problem.How can i fix this:

I have setuped these thing in my device:

1.USB debug mode: 2.开发者_StackOverflow社区Thick Unknown source

do you have set all necessary options at your device? for correct settings look at this side: http://developer.android.com/guide/developing/device.html

or have you already tried to reboot the device or disconnect and connect it again?

Try this:

Drag the notification bar & click on "USB Connected" then click the button "Turn off USB storage" and "Turn on USB storage".Then Its ok

You may be clicked this option previously