在单个activity应用程序中实现片段间通信和用新片段替换片段的正确方法

FragmentManager fragmentManager = getSupportFragmentManager();
FragmentA fragmentA = (FragmentA) fragmentManager.findFragmentById(R.id.fragment_a);
FragmentB fragmentB = (FragmentB) fragmentManager.findFragmentById(R.id.fragment_b);

public interface OnDataChangeListener {
    void onDataChanged(String newData);
}

private OnDataChangeListener onDataChangeListener;

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    try {
        onDataChangeListener = (OnDataChangeListener) context;
    } catch (ClassCastException e) {
        throw new ClassCastException(context.toString() + " must implement OnDataChangeListener");
    }
}

private void sendDataToFragmentB(String newData) {
    if (onDataChangeListener != null) {
        onDataChangeListener.onDataChanged(newData);
    }
}

@Override
public void onDataChanged(String newData) {
    FragmentB fragmentB = (FragmentB) fragmentManager.findFragmentById(R.id.fragment_b);
    if (fragmentB != null) {
        fragmentB.updateData(newData);
    }
}

public void updateData(String newData) {
    // 更新FragmentB的UI界面
}

FragmentC fragmentC = new FragmentC();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.fragment_container, fragmentC);
transaction.commit();