工程上有红叉，但是工程里面没有错误，控制台显示错误信息：
Dex Loader] Unable to execute dex: wrapper was not properly loaded first
Conversion to Dalvik format failed: Unable to execute dex: wrapper was not properly loaded first
Conversion to Dalvik format failed: Unable to execute dex: wrapper was not properly loaded first
解决办法：打开eclipse安装目录中的eclipse.ini，把最后2行文字修改为：
-Xms128m
-Xmx512m
重启Eclipse即可。