android DDMS找不到设备

1、查看adb 的进程端口号是什么，输入命令 adb nodaemon server 显示端口号

2、查看端口号对应的进程pid ,输入命令 netstat -ano  查看对应的端口号的进程号

3、查看进程号对应的进程名称或结束进程 tasklist|findstr "进程号"或 taskkill /f /pid 进程号

或者彻底删除这个驱动程序 在任务管理中找到tadb 那个进程程序右击找到它所在的文件夹，直接删除即可！

另一种方法：

自己配置 adb server 端口，使用一个生僻的值。

很简单，只要在系统环境变量中定义 ANDROID_ADB_SERVER_PORT 的值即可。

最好选择一个5位数的端口号（10000 ~ 65535），不易重复。

win下只要在环境变量中增加一个ANDROID_ADB_SERVER_PORT ，值填你自己定义的端口。

linux下只要 export $ANDROID_ADB_SERVER_PORT = 自定义端口，即可。

这时打开一个命令行，输入adb devices，看看是不是在新的端口上启动了啊？ 

以下都是ADB连接问题，可以通过尝试如下步骤，由简单度排序

1. 插拔下USB连接线

2. 关闭USB模式再打开

3. 执行以下命令

 adb kill-server
 adb start-server

4.  效果与3相同

DDMS - Devices - Reset adb

5. 关闭所有PC套件，例如：

杀死 Wandoujia  相关的所有进程，ok

wandoujia_daemon.exe

wandoujia_helper.exe

6. 重启Eclipse7. 查看有几个ADB进程，全部杀死再重新启动ADB

8. 查看下USB先是否连接电脑与手机

9. 重启手机

10. 关闭占用5037端口软件

11. 更新adb （见问题14）

1. 查看占用端口5037的PID值 netstat -a -n -o |findstr "5037" 输出结果：  TCP    127.0.0.1:5037         0.0.0.0:0              LISTENING       5096  TCP    127.0.0.1:5037         127.0.0.1:51577        ESTABLISHED     5096  TCP    127.0.0.1:51577        127.0.0.1:5037         ESTABLISHED     43242. 从上面得知PID = 5096占用了5037端口，现在通过PID查看进程名，看到底哪个进程占用此端口 tasklist /v | findstr 5096 输出结果：tadb.exe  5096 Console  1  4,932 K Unknown  ......  0:00:02 暂缺网上查询得知tadb.exe是腾讯管家启动的进程3. 杀死占用5037端口的进程 tadb.exetaskkill /f -pid 5096taskkill /im tadb.exe输出结果成功: 已终止 PID 为 5096 的进程。

问题1 

 The connection to adb is down, and a severe error has occured.
 You must restart adb and Eclipse.
 Please ensure that adb is correctly located at 'adb.exe' and can be executed.

问题2

 ADB server didn't ACK
 * failed to start daemon *

问题3

 Adb failed to restart！ Make sure the plugin is properly configured

问题4

 ** Adb connection Error:远程主机强迫关闭了一个现有的连接

问题5

 java.io.IOException: 您的主机中的软件中止了一个已建立的连接。
       at sun.nio.ch.SocketDispatcher.write0(Native Method)
       at sun.nio.ch.SocketDispatcher.write(Unknown Source)
       at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
       at sun.nio.ch.IOUtil.write(Unknown Source)
       at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
       at com.android.ddmlib.JdwpPacket.writeAndConsume(JdwpPacket.java:213)
       at com.android.ddmlib.Client.sendAndConsume(Client.java:575)
       at com.android.ddmlib.HandleHeap.sendREAQ(HandleHeap.java:348)
       at com.android.ddmlib.Client.requestAllocationStatus(Client.java:421)
       at com.android.ddmlib.DeviceMonitor.createClient(DeviceMonitor.java:854)
       at com.android.ddmlib.DeviceMonitor.openClient(DeviceMonitor.java:822)
       at com.android.ddmlib.DeviceMonitor.processIncomingJdwpData(DeviceMonitor.java:781)
       at com.android.ddmlib.DeviceMonitor.deviceClientMonitorLoop(DeviceMonitor.java:649)
       at com.android.ddmlib.DeviceMonitor.access$100(DeviceMonitor.java:42)
       at com.android.ddmlib.DeviceMonitor$3.run(DeviceMonitor.java:577)

通常是同时打开了两个eclipse,关闭一个即可

问题6

 Failed to install .apk on device '': Unable to open sync connection!
 java.io.IOException: Unable to open sync connection!
 Launch canceled!

问题7

 ADB rejected shell command (rm /data/local/.apk): closed
 Error during Sync: Unable to open sync connection!
 Error during Sync: Unable to open sync connection!
 Adb connection Error:远程主机强迫关闭了一个现有的连接。
 Connection attempts: 1
 Connection attempts: 2
 Connection attempts: 3

问题8

 Failed to install .apk on device  : Too many open files
 com.android.ddmlib.SyncException: Too many open files
 Launch failed on device:

问题9

 Failed to install .apk on device '': closed
 com.android.ddmlib.InstallException: closed
 Launch failed on device:

问题10

 Installation error: INSTALL_FAILED_INSUFFICIENT_STORAGE
 Please check logcat output for more details.
 Launch failed on device:

问题11

 Installation error: INSTALL_FAILED_UPDATE_INCOMPATIBLE
 Please check logcat output for more details.
 Launch failed on device:

使用PC套件删除，然后安装不行，通过adb uninstall 再次删除，安装ok

问题12

 Android Launch!
 Connection with adb was interrupted.
 0 attempts have been made to reconnect.
 You may want to manually restart adb from the Devices view.

问题13

 Unexpected error while launching logcat. Try reselecting the device.] closed
 om.android.ddmlib.AdbCommandRejectedException: closed
      at com.android.ddmlib.AdbHelper.executeRemoteCommand(AdbHelper.java:381)
      at com.android.ddmlib.Device.executeShellCommand(Device.java:462)
      at com.android.ddmuilib.logcat.LogCatReceiver$1.run(LogCatReceiver.java:109)
      at java.lang.Thread.run(Unknown Source)

问题14

 adb server is out of date.  killing...
 * daemon started successfully *
 error: device offline

出现问题的版本

 D:\>adb version
 Android Debug Bridge version 1.0.29

问题出在adb的版本太低，更新ADT后问题解决

 D:\>adb version
 Android Debug Bridge version 1.0.31

原文链接： http://blog.csdn.net/love_world_/article/details/8130416