问题
I am making my first android application with the ActionBarSherlock.
The application will always have an action bar consisting of 3 tabs (first tab selected by default). The app could be extended for use with a tablet.
I have been searching the web, and following the android development guides, however I am finding a few things confusing. The first tab screen will be a list view with a list of items, onitemselected should send the user to a screen which features more details about that item.
When should I use a fragment? Should each tab be a fragment? Or, should each tab call a new activity, which consists of fragments? And, if using fragments, should I place them in different classes, or embed them within an activity??
Appreciate any help, thanks.
回答1:
you should probably read these two links first.
http://android-developers.blogspot.com/2011/09/preparing-for-handsets.html
http://android-developers.blogspot.com/2011/02/android-30-fragments-api.html
If you plan to make an app that work on both phone and tablet. It is a good idea to use a fragment, and then use a shell activity to wrap that fragment.
回答2:
My experience with Fragments is mostly on ViewPager, so I am not entirely sure if it applies here.
In Android, you should use Fragments as much as possible. As a general rule of thumb, imagine you are translating the UI from phones to tablets, elements that can stay together in the same configuration should be a Fragment.
There is a Fragment subclass called ListFragment, so you might want to look into that for your first tab. (ListFragment is for Fragment like ListActivity is for Activity)
There is also a tutorial I found to deal with fragments. Did not really look into it but I hope it helps.
http://android.codeandmagic.org/2011/07/android-tabs-with-fragments/
As for ActionBar / ActionBarSherlock, I have absolutely no experience withit so someone might want to add to that.
来源：https://stackoverflow.com/questions/9106063/android-layout-fragment-activity-confusion