片段设计

Question

I'm having a problem with fragments in my application. My interface looks like this:

Screen 1
+---------------+
|   Fragment 1  |
+---------------+
|   Fragment 2  |
|               |
|               |
+---------------+

Screen 2
+---------------+
|   Fragment 1  |
+---------------+
|   Fragment 3  |
|               |
|               |
+---------------+

Each screen is a separate activity and these fragments are defined in my layout .xml files (therefore replacing dynamically probably won't work).

My question is:

Both screen1 and screen2 contain a fragment1, and all the information that goes with it. As it stands, I am currently passing all the data for fragment1 when I start the screen2 activity - I then populate fragment1 in screen2 with the data from fragment1 screen1. If the user hits the back button, I have to populate fragment1 screen1 with whatever was changed in screen2. It's a big headache.

Is there an easier way to do this?

(I'd prefer not to use the single-activity/multiple-fragment approach since I've already been there and decided that multiple-activity/multiple-fragment works better for this application.)

Answer 1

Is there an easier way to do this?

Yes, use a single Activity , and have Fragment 3 replace Fragment 2 when you need to add it, so Fragment 1 will remain the same with all of its data.

(I'd prefer not to use the single-activity/multiple-fragment approach since I've already been there and decided that multiple-activity/multiple-fragment works better for this application.)

I'd have to disagree, since you have chosen the harder route by setting your Fragments in xml and passing around their data between Activity s. I can almost guarantee that is more work than setting FrameLayout containers in your layout and then simply adding/replacing Fragment s in them.

Simple example - http://developer.android.com/training/basics/fragments/fragment-ui.html