If your C:/Android-SDK-Windows/toolsdirectory does not contain the executable file "adb.exe.
When you open eclipse, the android plug-in reports an error.
In this case, you should do the following:
First, change your environment variables to C:/Android-SDK-Windows/tools:/Android-SDK-Windows/platform-tools.
(If the environment variable cannot be found, you do not need to set it)
Next, set adb.exe and adbwinapi under the C:/Android-SDK-Windows/platform-toolsdirectory. DLL, adbwinusbapi. DLL files are copied to your C:/Android-SDK-Windows/tools directory,
Copy other files to the C:/Android-SDK-Windows/platforms/Android-9/tools directory,
Now you have doubts. There is no tools folder in the C:/Android-SDK-Windows/platforms/Android-9 directory. In this case, you need to create a new folder, put them in it.
At this point, most of the work has been completed, and now you can restart your eclipse, but it will prompt you to update the android plug-in, then you will be OK as prompted.
(Another solution is to update only 1.5 and then the new version. Generally, 2.2 and 2.3 will encounter this problem !)