how can I call fragment from activity in android

问题

how to call Fragment from Activity. I am using below code.here MainFragment extends Fragment only.

  MainFragment  mainFragment = new MainFragment();
                 getSupportFragmentManager().beginTransaction()
                .add(android.R.id.content, mainFragment).commit();

but "getSupportFragmentManager()" in my Activity class is not supported.

回答1:

You need extend your activity from FragmentActivity

回答2:

MainFragment mainFragment = (MainFragment)getFragmentManager().findFragmentById(R.id.fragmentBId);
mainFragment.performSomeTask();

来源：https://stackoverflow.com/questions/22069865/how-can-i-call-fragment-from-activity-in-android