Android---真机调试时不能识别手机的解决方案

我自己遇到的问题是VS2013和VS2015中xamarin无法识别到真机，现象就是插上手机开启调试模式，豌豆荚都可以连接上手机，就是VS上没出现手机。
但是低版本的手机貌似又行，4.0.3的。
于是排除了各种问题，比如手机开发这模式，数据线，ADB驱动，ANDROID SDK升级，都不行，
最后随意地点了下Restart Adb Server：





发现居然可以识别到真机了，我只能说比较神奇。。。

下面是引用别人的文章，不过我并没有参考，还是放这里吧：
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

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