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Mac上的eclipse出现如下错误的解决方案：
The connection to adb is down, and a severe error has occured.
ADB server didn't ACK
解决方案：
- 先把eclipse和Genymotion关闭。
- 命令行进入你的android SDK 的platform-tools下。
- 执行命令 `./adb shell adb kill-server 关闭adb进程。
如果出现下面错误，需要查找占用5037端口的进程，并杀死这些进程。
adb server is out of date. killing... cannot bind 'tcp:5037' ADB server didn't ACK`
failed to start daemon * error:
- 执行命令
lsof -i tcp:5037。 查看占用5037端口的进程。adb 使用端口5037.
输出：
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
adb 4246 User 10u IPv4 0x89825d304bfc8555 0t0 TCP localhost:5037 (LISTEN)
adb 4246 User 11u IPv4 0x89825d304c2f687d 0t0 TCP localhost:5037->localhost:59971 (ESTABLISHED)
adb 4246 User 13u IPv4 0x89825d304bf04a6d 0t0 TCP localhost:5037->localhost:59973 (ESTABLISHED)
adb 4248 User 3u IPv4 0x89825d304b635e4d 0t0 TCP localhost:59971->localhost:5037 (ESTABLISHED)
adb 4250 User 3u IPv4 0x89825d304c2fa87d 0t0 TCP localhost:59973->localhost:5037 (ESTABLISHED)
kill进程 找到进程的PID,使用kill命令：
kill PID（进程的PID，如4246），杀死对应的进程重启eclipse。
