有时在打开模拟器的时候会出现The connection to adb is down, and a severe error has occured.这个问题,这个问题的解决办法有两个: 
方法一:找到adb.exe存放的地方(一般出现这个错误的时候,现在会提示adb.exe的路径),双击adb.exe让他运行就行了 
方法二:使用命令行,开始---运行---输入cmd,使用cmd命令行,然后在命令行中进入adb.exe所存放的路径,然后输入adb  kill-server,点击Enter键,然后再输入adb  start-server,点击Enter键,如果下面提示daemon  started  successfully,则表示adb.exe已经运行了,现在可以使用android 模拟器来运行你的程序了;(如下图所示)

注意:如果提示failed to start daemon,则表示这样还没有使adb.exe运行起来,还不能使用android模拟器,那么现在咱们就使用快捷键Ctrl+Alt+Delete打开任务管理器,在”进程“里面找到tadb.exe,然后点击结束进程,然后再重复方法二的操作,应该就可以成功运行adb.exe了(至于为什么选择结束进程tadb.exe的原因,我觉得可能是因为adb.exe与tadb.exe的端口是同一个,两个不能同时使用这个端口,只有它们当中的一个能使用这个端口)

2.报错:
The connection to adb is down, and a severe error has occured.
这个问题谁能解决啊
解决:
cmd跳到sdk tools文件路径下
adb kill-server
然后再adb start-server

3.报错:
The connection to adb is down, and a severe error has occured.
[2010-03-11 09:36:56 - HelloOPone] You must restart adb and Eclipse.
[2010-03-11 09:36:56 - HelloOPone] Please ensure that adb is correctly located at 'D:\OPhoneSDK_1.5
\platform-tools\adb.exe' and can be executed.
解决:
方法1.cmd中adb kill-server,然后adb -startserver
方法2.方法1不管用,那么在任务管理器中杀死adb.exe,然后重启Eclipse。
方法3.方法1和2都不管用,那么查看最后一句报错中:platform-tools中是否有adb.exe(我的错误就是在相关路径下面没有platform-tools文件夹
,所以我选择新建一个文件夹,并且把tools中的文件全部复制到platform-tools中)
4.前面的方法试了还是不行的话,建议重新装一个系统,最好换个系统。有些大牛也说过:MS存在一些小问题[size=large][/size]

android adb shell:unknown host service

我们在Windows DOS窗口中输入adb shell后,会出现如下错误: adb server is out of date.  killing... ADB server didn't ACK * failed to start daemon * error: unknown host service   ,出现这问题是因为你的电脑上安装了豌豆夹造成的,只需打开“任务管理器”,找到'wandoujia_helper.exe',把这个进行终止掉就可以,

 

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