1. issue:
[2012-02-25 20:33:52 - test_1] Android requires compiler compliance level 5.0 or 6.0. Found '1.4' instead. Please use Android Tools > Fix Project Properties.
solution"
有两种解决办法：
1. 项目 右键 ->android tools ->Fix Project
2. 如果不可以，检查Project -> Properties->Java Compiler
确认JDK compliance被设置为1.6,并且enable specific seetings.
2. issue：
BUILD FAILED
D:\workspace\ganji\build.xml:144: The following error occurred while executing this line:
D:\workspace\ganji\build.xml:271: Unable to delete file D:\workspace\ganji\tmp\proguard\tmp.jar
solution：
已经开了一个模拟器了，无法重新编译，必须关闭一个。用于ant
3. issue：
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.
solution：
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