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
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1. adb kill-server
2. 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Eclipse
7. 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 4324
2. 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.exe
taskkill /f -pid 5096
taskkill /im tadb.exe
输出结果
成功: 已终止 PID 为 5096 的进程。
问题1
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1. The connection to adb is down, and a severe error has occured.
2. You must restart adb and Eclipse.
3. Please ensure that adb is correctly located at 'adb.exe' and can be executed.
问题2
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1. ADB server didn't ACK
2. * failed to start daemon *
问题3
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1. Adb failed to restart！ Make sure the plugin is properly configured
问题4
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1. ** Adb connection Error:远程主机强迫关闭了一个现有的连接
问题5
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1. java.io.IOException: 您的主机中的软件中止了一个已建立的连接。
2. at sun.nio.ch.SocketDispatcher.write0(Native Method)
3. at sun.nio.ch.SocketDispatcher.write(Unknown Source)
4. at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
5. at sun.nio.ch.IOUtil.write(Unknown Source)
6. at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
7. at com.android.ddmlib.JdwpPacket.writeAndConsume(JdwpPacket.java:213)
8. at com.android.ddmlib.Client.sendAndConsume(Client.java:575)
9. at com.android.ddmlib.HandleHeap.sendREAQ(HandleHeap.java:348)
10. at com.android.ddmlib.Client.requestAllocationStatus(Client.java:421)
11. at com.android.ddmlib.DeviceMonitor.createClient(DeviceMonitor.java:854)
12. at com.android.ddmlib.DeviceMonitor.openClient(DeviceMonitor.java:822)
13. at com.android.ddmlib.DeviceMonitor.processIncomingJdwpData(DeviceMonitor.java:781)
14. at com.android.ddmlib.DeviceMonitor.deviceClientMonitorLoop(DeviceMonitor.java:649)
15. at com.android.ddmlib.DeviceMonitor.access0(DeviceMonitor.java:42)
16. at com.android.ddmlib.DeviceMonitor.run(DeviceMonitor.java:577)
通常是同时打开了两个eclipse,关闭一个即可
问题6
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1. Failed to install .apk on device '': Unable to open sync connection!
2. java.io.IOException: Unable to open sync connection!
3. Launch canceled!
问题7
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1. ADB rejected shell command (rm /data/local/.apk): closed
2. Error during Sync: Unable to open sync connection!
3. Error during Sync: Unable to open sync connection!
4. Adb connection Error:远程主机强迫关闭了一个现有的连接。
5. Connection attempts: 1
6. Connection attempts: 2
7. Connection attempts: 3
问题8
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1. Failed to install .apk on device : Too many open files
2. com.android.ddmlib.SyncException: Too many open files
3. Launch failed on device:
问题9
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1. Failed to install .apk on device '': closed
2. com.android.ddmlib.InstallException: closed
3. Launch failed on device:
问题10
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1. Installation error: INSTALL_FAILED_INSUFFICIENT_STORAGE
2. Please check logcat output for more details.
3. Launch failed on device:
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1. Installation error: INSTALL_FAILED_UPDATE_INCOMPATIBLE
2. Please check logcat output for more details.
3. 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
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1. Android Launch!
2. Connection with adb was interrupted.
3. 0 attempts have been made to reconnect.
4. You may want to manually restart adb from the Devices view.
问题13
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1. Unexpected error while launching logcat. Try reselecting the device.] closed
2. om.android.ddmlib.AdbCommandRejectedException: closed
3. 381)
4. 462)
5. 1.run(LogCatReceiver.java:109)
6. at java.lang.Thread.run(Unknown Source)
问题14
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1. adb server is out of date. killing...
2. * daemon started successfully *
3. error: device offline
出现问题的版本
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1. D:\>adb version
2. 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
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1. D:\>adb version
2. Android Debug Bridge version 1.0.31