iosched 2012 - handle fragment in onSaveInstanceState

gistfile1.java

    // iosched/android/src/com/google/android/apps/iosched/ui/HomeActivity.java

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        // Since the pager fragments don't have known tags or IDs, the only way to persist the
        // reference is to use putFragment/getFragment. Remember, we're not persisting the exact
        // Fragment instance. This mechanism simply gives us a way to persist access to the
        // 'current' fragment instance for the given fragment (which changes across orientation
        // changes).
        //
        // The outcome of all this is that the "Refresh" menu button refreshes the stream across
        // orientation changes.
        if (mSocialStreamFragment != null) {
            getSupportFragmentManager().putFragment(outState, "stream_fragment",
                    mSocialStreamFragment);
        }
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        if (mSocialStreamFragment == null) {
            mSocialStreamFragment = (SocialStreamFragment) getSupportFragmentManager()
                    .getFragment(savedInstanceState, "stream_fragment");
        }
    }