问题
I'm having a problem with com.here.android.mapping.MapFragment when trying to use it with tabs.
The issue comes that since the TabActivity is deprecated(I know it still works, but need a future proof solution), and FragmentTabHost appears to be requiring the v4 fragment to be used (it crashes if the fragment is derived from other one) , then when I try having the com.here.android.mapping.MapFragment used in a layout of one of the tab fragments, then I can not retrieve it for the required initialization, since the (MapFragment) getFragmentManager().findFragmentById() line has error indicating that the casting to MapFragment can not be made.
I suppose the issue is that MapFragment is derived from android.app.Fragment and the findFragmentById expects to return mix android.support.v4.app.Fragment, so the question would be on how could I get this mixture to run smoothly together ?
回答1:
The android.support.v4.app.Fragment and the android.app.Fragment classes can't be used interchangeably.
Nokia have created com.here.android.mapping.MapCompatibilityFragment which extends android.support.v4.app.Fragment - use that instead if your app uses support fragments.
来源：https://stackoverflow.com/questions/22294506/how-to-mix-android-support-v4-app-fragment-and-android-app-fragment