在安装apk时，出现：
Package xxx signatures do not match the previously installed version; ignoring!
google上说：
If you have multiple computers (or developers) and build some of your apks on some computer, and other apks on another computer, the signatures will *not* match (they are created automatically on the first build), and you will not be able to use the sharedUserId feature.
– Use the same "debug.keystore"
– C: \Documents and Settings\Cheryl.Sedota\Local Settings\Application Data\Android\debug.keystore
原因应该是由于apk的签名不一致，导致原有apk不能重新安装。在eclipse编译是会有默认debug签名。要解决这个问题，就得给apk做统一的签名。