FragmentActivity doesn't see activity in onActivityCreate(), after screen orientation changed
- by hai bison
I'm using Android support library v13. There is a strange thing I couldn't understand.
When creating new activity, I load fragment as:
Main activity layout:
...
<FrameLayout
android:id="@+id/fragment_1"
... />
In onCreate() of main activity:
mFragment = (FragmentActivity) getSupportFragmentManager().findFragmentById(R.id.fragment_1);
// if screen orientation changed, no need to create new instance of fragment
if (mFragment == null) {
mFragment = ...; // create new instance of fragment
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.fragment_1, mFragment);
// because this is called ONCE, we can use this method
ft.commitAllowingStateLoss();
}
Now, everything works perfectly in emulators 1.5, 1.6 and 2.2. I have a phone 2.2.2.
But there is an exception: if the app is running, and screen orientation changed. Inside onActivityCreated(), getActivity() sometimes returns null. This only happens in emulators 1.5/ 1.6/ 2.2.
My phone 2.2.2 works very well, I test hundreds of times but never catch that bug. Even other emulators 3.x, 4.x work well too. Unfortunately I don't have phone 1.5/ 1.6/ 2.2.
So did you have experience with this? Is that a bug of the support library, or emulators? Could you please help me?
Thank you in advance.
