片段轮换不还原当前片段

Question

I have a fragmentactivity that starts on Fragment A then can be change to Fragment B. If i am on Fragment B and i rotate my device. It loads the original Fragment A not Fragment B. I am Loading both Fragment A and B pragmatically. I thought android was supposed to save which Fragment i was on automatically i am not overriding onSaveInstanceState

This is how i am loading the fragments

FragmentTransaction t = this.getSupportFragmentManager()
            .beginTransaction();
    t.replace(R.id.fragholder, new MainFragment());
    t.commit();

Answer 1

When you rotate your device, it destroys your Activity and recreates its. So assuming Fragment A is the default Fragment, then it is logical that it would load that when the Activity is recreated. So you would need to override onSaveInstanceState to store which Fragment is visible and then reload that Fragment in onCreate.

Reference to relevant Activity Lifecycle doc: http://developer.android.com/training/basics/activity-lifecycle/recreating.html

Answer 2

只需将android：configChanges =“ orientation | screenSize”添加到清单中，android就会为您处理一切