最佳实践：在Android活动之间传递对象

Question

I was wondering what the best practice is to pass objects between activies? My logged out user is on a content item and should be able to get back to this item after the login process. Therefore I need to pass the content id between these activities

I see 2 basic options:

1. Pass the content-id in the intent as URI (intent.putExtra()) and pass them between activities
2. Save the content-id to the local storage and load it again after login

Are there any other options and best practices?

Answer 1

i would suggest using SharedPreferences which is like the option 2. which allows your to get the content-id(or string or json object) after the app is closed. you can also encrypt the content-id before put it in sharedPreferences

Besides intent (ram) and local storage (rom/sdcard , including database), i cant see any other option(locally).

Case 1: you need to resume activity after the app is closed
you should use local storage

Case 2: you don't need to resume activity after the app is closed

 option 1: 0. load the first activity 1. start login_activity (startActivityForResult()) (do not call finish() ) 2. after login is done (call finish()) 3. activity is resumed (if login fail -> redirect to other activity ) option 2: 1. create a public class with a data member to save the content-id/activity class (you may assign singleton design pattern)