Developing Android apps on Eclipse can sometimes be a problem with Eclipse's inability to identify the phone, and even if the data cable is unplugged, plugged in and out of the way, even restarting eclipse or restarting the computer, the problem remains unresolved. At this time is very distressed, because this problem really no solution, we do not know what is the reason, the reason is too much!
First of all to provide a few commonly used solutions, if not really, it is really no way.
Turn off eclipse--> Unplug usb--> Open Task Manager, turn all Eclipse.exe and Adb.exe off, and re-open eclipse--> to reconnect to USB.
Most of the next, with this trick can be solved, but there is no situation, then need to enter the mobile phone management interface, the debugging interface that adjustable options to turn off, and then open, data cable reconnect computer, if still not, can only deploy this trick:
Under the computer terminal to enter your own SDK path under Tools or TOOLS7 directory, enter "adb kill-server" and then enter "adb start-server", if there is a configuration environment variable, directly enter these two commands on the line.
If it doesn't work, then it's just a phone change.
Solutions that eclipse cannot connect to your phone