// MainActivity.java
public class MainActivity extends AppCompatActivity {
private FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getSupportFragmentManager();
if (savedInstanceState == null) {
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.fragment_container, new FirstFragment());
transaction.commit();
}
}
public void switchToSecondFragment() {
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.fragment_container, new SecondFragment());
transaction.addToBackStack(null);
transaction.commit();
}
public void switchToFirstFragment() {
fragmentManager.popBackStack();
}
}
// FirstFragment.java
public class FirstFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_first, container, false);
Button switchButton = view.findViewById(R.id.switch_button);
switchButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
MainActivity activity = (MainActivity) getActivity();
activity.switchToSecondFragment();
}
});
return view;
}
}
// SecondFragment.java
public class SecondFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_second, container, false);
Button switchButton = view.findViewById(R.id.switch_button);
switchButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
MainActivity activity = (MainActivity) getActivity();
activity.switchToFirstFragment();
}
});
return view;
}
}
