当我尝试从片段中显示或隐藏浮动操作按钮时出错

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如何解决当我尝试从片段中显示或隐藏浮动操作按钮时出错？

package cl.itn.cam;

import androID.os.bundle;

import com.Google.androID.material.floaTingactionbutton.floaTingActionbutton;
import com.Google.androID.material.snackbar.Snackbar;

import androIDx.appcompat.app.AppCompatActivity;
import androIDx.appcompat.Widget.Toolbar;
import androIDx.fragment.app.Fragment;
import androIDx.fragment.app.Fragmenttransaction;
import androIDx.navigation.fragment.NavHostFragment;

import androID.vIEw.VIEw;

public class NCR extends AppCompatActivity {

    Fragmenttransaction transaction;
    Fragment fragmentFirst,fragmentSecond;
    floaTingActionbutton fab = findVIEwByID(R.ID.fab);

    @OverrIDe
    protected voID onCreate(Bundle savedInstanceStatE) {
        super.onCreate(savedInstanceStatE);
        setContentVIEw(R.layout.activity_n_c_r);

        fragmentFirst = new FirstFragment();
        fragmentSecond = new SecondFragment();


    }

    public floaTingActionbutton getfloaTingActionbutton() {
        return fab;

    }

    public voID showfloaTingActionbutton() {
        fab.show();
    }

    public voID hIDefloaTingActionbutton() {
        fab.hIDe();
    }

}

public class FirstFragment extends Fragment {

    @OverrIDe
    public VIEw onCreateVIEw(
            LayoutInflater inflater,VIEwGroup container,Bundle savedInstanceState
    ) {


        final floaTingActionbutton fab = ((NCR) getActivity()).getfloaTingActionbutton();

        if (fab != null) {
            ((NCR) getActivity()).hIDefloaTingActionbutton();
        }

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_first,container,falsE);

    }

    public voID onVIEwCreated(@NonNull View view,Bundle savedInstanceStatE) {
        super.onVIEwCreated(vIEw,savedInstanceStatE);

        vIEw.findVIEwByID(R.ID.button_first).setonClickListener(new VIEw.onClickListener() {
            @OverrIDe
            public voID onClick(View view) {

                NavHostFragment.findNavController(FirstFragment.this)
                        .navigate(R.ID.action_FirstFragment_to_SecondFragment);
            }
        });
    }
}

public class SecondFragment extends Fragment {

    @OverrIDe
    public VIEw onCreateVIEw(
            LayoutInflater inflater,Bundle savedInstanceState
    ) {


        final floaTingActionbutton fab = ((NCR) getActivity()).getfloaTingActionbutton();

        if (fab != null) {
            ((NCR) getActivity()).showfloaTingActionbutton();
        }



        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_second,falsE);
    }

    public voID onVIEwCreated(@NonNull View view,savedInstanceStatE);

        vIEw.findVIEwByID(R.ID.button_second).setonClickListener(new VIEw.onClickListener() {
            @OverrIDe
            public voID onClick(View view) {
                NavHostFragment.findNavController(SecondFragment.this)
                        .navigate(R.ID.action_SecondFragment_to_FirstFragment);
            }
        });
    }

解决方法

FloaTingActionButton fab = findViewById(R.id.fab);

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