android原理理解障碍，怎么破。

[hkh_1012]

最近在看官方资料，见到下面一段话，始终无法理解，
两个不同应用相互彼此访问资源？有这样的情景么？求指教。
It's possible to arrange for two applications to share the same Linux user ID, in which case they are able to access each other's files. To conserve system resources, applications with the same user ID can also arrange to run in the same Linux process and share the same VM (the applications must also be signed with the same certificate).

[浅笑_JIE]

aidl 可以使程序访问到 另外的程序

[黄舒颖 咸丫蛋]

android uid 相同的话，在同一个进程，共享文件访问权限等 http://blog.csdn.net/vshuang/article/details/43639211

[windfury_plus]

sharedpreferences里设置的是Context.MODE_WORLD_READABLE的话（已经不被推荐） 就可以让其他app访问其sp 还有intent夸应用可能也有关……还有其他访问方式