Both Handoff and AirDrop are not working after upgrading to El Capitan

I really do not know what the hell going on after upgrading to Mac OS X El capitan. Handoff and AirDrop now seem to stop working between my iPhone 6 (iOS 9) and my Macbook pro 2014 retina.
Are there anyone experienced the same problem can help?

My circumstance was a little bit different. But whatever, just take the following steps to get rid of the trouble.

Step 1: Turn off Bluetooth in El Capitan.
Step 2: Find and delete the in /Library/Preferences/
Step 3: Turn the bluetooth on again.

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Great work. Thanks