How to Access Getsupportfragmentmanager() in a Fragment

How can I access getSupportFragmentManager() in a fragment?

You can directly call

getParentFragmentManager()  

to get the fragment manager. Note that getFragmentManager() also works but has been marked as deprecated.

getSupportFragmentManager() inside a fragment inside a fragment

use this getChildFragmentManager(); to get the FragmentManager inside a Fragment

How to use getSupportFragmentManager in fragment?

EDITED:
use this:

 // Remove old code
        // SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);

        // don't recreate fragment everytime ensure last map location/state are maintained
        if (mapFragment == null) {
            mapFragment = SupportMapFragment.newInstance();
            mapFragment.getMapAsync(new OnMapReadyCallback() {
                @Override
                public void onMapReady(GoogleMap googleMap) {
                    LatLng latLng = new LatLng(1.289545, 103.849972);
                    googleMap.addMarker(new MarkerOptions().position(latLng)
                            .title("Singapore"));
                    googleMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
                }
            });
        }

        // R.id.map is a FrameLayout, not a Fragment
        getChildFragmentManager().beginTransaction().replace(R.id.map, mapFragment).commit();

according to this link Add SupportMapFragment (Android Google Maps) In Fragment

Get access to getSupportFragmentManager in non activity class

Pass your Activity instead of Context

public synchronized static void checkNewdata(List<data>input, Activity activity) {
..
       FragmentManager ft = ((FragmentActivity)activity).getSupportFragmentManager();
                DialogFragment newFragment = MyNotification.newInstance();
                newFragment.setCancelable(false);
                newFragment.show(ft, "mydialog");
..
   }

How to call getSupportFragmentManager() when trying to Navigate to fragment from Recycler Adapter

getSupportFragmentManager() is a method from AppCompatActivity: https://developer.android.com/reference/android/support/v4/app/FragmentActivity#getSupportFragmentManager()

If you use Fragment from support lib (extending AppCompatActivity) you need replace for this:

FragmentManager fragmentManager = ((Activity) context).getSupportFragmentManager();

or use Fragment from Android SDK:

FragmentManager fragmentManager = ((Activity) context).getFragmentManager();

How to invoke getSupportFragmentManager() or getFragmentManager() in Activity?

Use AppCompatActivity instead of Activity to use getSupportFragmentManager() in Your Activity

and use getFragmentManager() or getActivity().getSupportFragmentManager() in fragment

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