Android also has a central place for your accounts, and there is an AccountManager API to get access to them. You'll find your Google, Skype, Facebook, linkedin etc in there (and apps can add their own.) http://developer.android.com/reference/android/accounts/Acco...
Since iOS doesn't have this, and many developers did their apps on iOS first, they ignore the functionality and ask you for credentials etc again. It is extremely annoying. I regularly contact app developers to point out they could do better. https://plus.google.com/110166527124367568225/posts/bz1pN3az...
I encourage other Android users to do the same. You should never have to re-enter credentials the system already knows about.
Since iOS doesn't have this, and many developers did their apps on iOS first, they ignore the functionality and ask you for credentials etc again. It is extremely annoying. I regularly contact app developers to point out they could do better. https://plus.google.com/110166527124367568225/posts/bz1pN3az...
I encourage other Android users to do the same. You should never have to re-enter credentials the system already knows about.