我尝试了每种类型的解决方案，但是fragment get argument方法总是返回null。
这是我的片段代码。

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_main_activity, container, false);

      **String data1 = getArguments().getString("data");
        Toast.makeText(getActivity(), getArgument1, Toast.LENGTH_SHORT).show();**
}

在上述代码中，data1总是返回null。这是我的主要活动代码。

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        chipNavigationBar = findViewById(R.id.bottomNavBar);
        chipNavigationBar.setItemSelected(R.id.home, true);
        getSupportFragmentManager().beginTransaction().replace(R.id.container1, new mainActivityFragment()).commit();

        chipNavigationBar.setOnItemSelectedListener(new ChipNavigationBar.OnItemSelectedListener() {
            @Override
            public void onItemSelected(int i) {
                Fragment fragment = null;
                switch (i) {
                    case R.id.home:

                      **fragment = new mainActivityFragment();
                        Bundle bundle = new Bundle();
                        bundle.putString("data","anything");
                        fragment.setArguments(bundle);**

                        break;
                    case R.id.menu:
                        fragment = new menuFragment();
                        break;

                    case R.id.corona:
                        fragment = new CoronaFragment();
                        break;
                }
                getSupportFragmentManager().beginTransaction().replace(R.id.container1, fragment).commit();
            }
        });

    }