FragmentTransaction transaction = getFragmentManager()
                                                 .beginTransaction();
transaction.add(R.id.content_frame,mediaControlFragment,"media");

报错提示：

The method add(int, Fragment, String) in the type FragmentTransaction is not applicable for the arguments (int, MediaControlsFragment, String)

原因：

是否使用的fragment兼容包（android.support.v4.app.Fragment）不一致