How can navigation between fragments be implemented using FragmentManager?

To navigate between fragments using FragmentManager, the following steps are usually performed:

1. Obtain an instance of FragmentManager from the activity or another fragment:

FragmentManager fragmentManager = getSupportFragmentManager();

2. Begin a fragment transaction:

FragmentTransaction transaction = fragmentManager.beginTransaction();

3. Replace the current fragment with a new one using the replace method or add a new fragment with add:

transaction.replace(R.id.fragment_container, newFragment);

4. Add the transaction to the back stack if you want the user to be able to return back:

transaction.addToBackStack(null);

5. Commit the transaction:

transaction.commit();

Example:

FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.fragment_container, new ExampleFragment());
transaction.addToBackStack(null); // to enable back navigation
transaction.commit();

Thus, navigation is implemented through managing fragment transactions and the back stack in FragmentManager.