当我在终端输入adb devices命令时，显示设备已连接
List of devices attached
0123456789ABCDEF device
但是当我输入adb logcat命令，系统显示以下信息，被挂起
waiting for device
这是什么原因呢？我是在 cts上测试的。
你可以试试下面的步骤，但是不能保证能否帮的上你:
# Kill and restart
$ adb kill-server
$ adb start-server
daemon not running. starting it now *
daemon started successfully *
# Device appears, but is listed as offline
$ adb devices
$ adb logcat