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

The method add(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, LayoutAnimaate.PlaceholderFragment)

解决：导包问题

it helped me, my Fragment was imported be android.app.fragment, I changed the import to android.support.v4.app, and the add error of my FragmentActivity Disapeared

import android.support.v4.app.Fragment;-----》import android.app.Fragment;