java - 方法不会覆盖其父类(super class)中的方法

Question

我正在尝试设置操作栏的标题，但它给了我错误消息“方法不会覆盖其父类(super class)中的方法”。我正在扩展 fragment 。

这是我遇到问题的部分:

@Override
public void setTitle(CharSequence title) {
    mTitle = title;
    getActivity().getActionBar().setTitle(mTitle);
}

这是整个类的代码(它不完整，因为我仍在研究它):

package com.android.styles.radius360;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.view.Menu;


/**
 * Created by user on 3/23/2017.
 */

public class HomePageFragment extends Fragment {

    private String[] mOptions;
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private CharSequence mTitle;

    private ActionBarDrawerToggle mDrawerToggle;
    private CharSequence mDrawerTitle;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View v = inflater.inflate(R.layout.home_page, container, false);

        mOptions = getResources().getStringArray(R.array.options_array);
        mDrawerLayout = (DrawerLayout) v.findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) v.findViewById(R.id.left_drawer);

        // Set the adapter for the list view
        mDrawerList.setAdapter(new ArrayAdapter<String>(getActivity(),
                R.layout.drawer_list_item, mOptions));
        // Set the list's click listener
        mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

        mTitle = mDrawerTitle = getActivity().getTitle();
        mDrawerLayout = (DrawerLayout) v.findViewById(R.id.drawer_layout);
        mDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout,
                R.string.drawer_open, R.string.drawer_close) {

            /** Called when a drawer has settled in a completely closed state. */
            public void onDrawerClosed(View view) {
                super.onDrawerClosed(view);
                getActivity().getActionBar().setTitle(mTitle);
                getActivity().invalidateOptionsMenu(); // Creates call to onPrepareOptionsMenu()
            }

            /** Called when a drawer has settled in a completely open state. */
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                getActivity().getActionBar().setTitle(mDrawerTitle);
                getActivity().invalidateOptionsMenu(); // Creates call to onPrepareOptionsMenu()
            }
        };

        // Set the drawer toggle as the DrawerListener
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        return v;
    }

    @Override
    public void onPrepareOptionsMenu(Menu menu) {
        // If the nav drawer is open, hide action items related to the content view
        super.onPrepareOptionsMenu(menu);
    }

    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getActivity().getActionBar().setTitle(mTitle);
    }


    /* The click listner for ListView in the navigation drawer */
    private class DrawerItemClickListener implements ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            selectItem(position);
        }
    }

    /** Swaps fragments in the main content view */
    private void selectItem(int position) {
        // Create a new fragment and specify the planet to show based on position
        if(position == 0)
        {
            FragmentManager fragmentManager = getFragmentManager();

            SettingsPageActivity settings = new SettingsPageActivity();
            Fragment fragment = settings.createFragment();
            fragmentManager.beginTransaction()
                    .replace(R.id.content_frame, fragment)
                    .commit();

        }
        // Insert the fragment by replacing any existing fragment

        // Highlight the selected item, update the title, and close the drawer
        mDrawerList.setItemChecked(position, true);
        mDrawerLayout.closeDrawer(mDrawerList);
    }

}

Answer 1

类 Fragment 或其任何父类(super class)似乎没有方法 public void setTitle(CharSequence title) 因此您不能使用 @覆盖注释。您可以删除该注释，应该没问题。