ClassNotFoundException when unmarshalling: android.support.v4.view.ViewPager$SavedState

Question

I am seeing the following error in my Android crash reports:

android.os.BadParcelableException: ClassNotFoundException when unmarshalling: android.support.v4         


        

Answer 1

If you don't want to include the source in v4 package you can declare the "fix" directly in your Adapter

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        final Object fragment = super.instantiateItem(container, position);
        try {
            final Field saveFragmentStateField = Fragment.class.getDeclaredField("mSavedFragmentState");
            saveFragmentStateField.setAccessible(true);
            final Bundle savedFragmentState = (Bundle) saveFragmentStateField.get(fragment);
            if (savedFragmentState != null) {
                savedFragmentState.setClassLoader(Fragment.class.getClassLoader());
            }
        } catch (Exception e) {
            Log.w("CustomFragmentStatePagerAdapter", "Could not get mSavedFragmentState field", e);
        }
        return fragment;
    }