There is a class for interacting with fragments:

class FragmentControl{ private AppCompatActivity activity; FragmentControl(AppCompatActivity activity) { this.activity = activity; } private FragmentTransaction getFragmentTransaction(){ FragmentManager fragmentManager = activity.getSupportFragmentManager(); return fragmentManager.beginTransaction(); } void addFragment(Fragment fragment){ getFragmentTransaction().add(R.id.fragment_container, fragment).commit(); } void removeFragment(Fragment fragment){ getFragmentTransaction().remove(fragment).commit(); } void replaceFragment(Fragment fragment){ getFragmentTransaction().replace(R.id.fragment_container, fragment).addToBackStack(null).commit(); }}

How to change the given code that did not swear on a method:

 private FragmentTransaction getFragmentTransaction(){ FragmentManager fragmentManager = activity.getSupportFragmentManager(); return fragmentManager.beginTransaction(); }

namely beginTransaction()

Writes that

This transaction should be completed with a commit () call less ... (Ctrl + 1)

Or in Russian:

This transaction must be completed with the commit () call less ... (Ctrl + 1). After creating the FragmentTransaction, you must also execute it.

    1 answer 1

    Try to change the code as follows.

     class FragmentControl { private AppCompatActivity activity; FragmentControl(AppCompatActivity activity) { this.activity = activity; } private FragmentTransaction getFragmentTransaction() { FragmentManager fragmentManager = activity.getSupportFragmentManager(); return fragmentManager.beginTransaction(); } void addFragment(Fragment fragment) { FragmentTransaction ft = getFragmentTransaction(); ft.add(R.id.fragment_container, fragment).commit(); } void removeFragment(Fragment fragment) { FragmentTransaction ft = getFragmentTransaction(); ft.remove(fragment).commit(); } void replaceFragment(Fragment fragment) { FragmentTransaction ft = getFragmentTransaction(); ft.replace(R.id.fragment_container, fragment).addToBackStack(null).commit(); } }

    Also help -1- , -2-