Question

这些是错误：

The method getMenuInflater() is undefined for the type HomeFragment -Line 27

The method onCreateOptionsMenu(Menu) of type HomeFragment must override or implement a supertype method -Line 29

The method onCreateOptionsMenu(Menu) of type HomeFragment must override or implement a supertype method -Line 25

所有这些都在我的HomeFragment.java

上

package com.colourity.snatsh;

import com.colourity.snatsh.R;
import java.util.ArrayList;
import com.colourity.snatsh.adapter.NavDrawerListAdapter;
import com.colourity.snatsh.model.NavDrawerItem;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;


public class HomeFragment extends Fragment {

    public HomeFragment(){}

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

        View rootView = inflater.inflate(R.layout.fragment_home, container, false);

        return rootView;
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu items for use in the action bar
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }
}

当我尝试在HomeFragment而不是MainActivity上设置操作栏图标时会发生这种情况。我是新人，所以请放轻松。任何帮助都会很棒。解决方案会很好。

修改

我的更新代码：

    package com.colourity.snatsh;

import com.colourity.snatsh.R;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.ViewGroup;

public class HomeFragment extends Fragment {

    public HomeFragment(){}

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

        View rootView = inflater.inflate(R.layout.fragment_home, container, false);

        return rootView;
    }

    @Override
    public void onCreateOptionsMenu (Menu menu, MenuInflater inflater) {
        // Inflate the menu items for use in the action bar
        MenuInflater inflater1 = getMenuInflater();
        inflater1.inflate(R.menu.main, menu);
        return;
    }

    private MenuInflater getMenuInflater() {
            // TODO Auto-generated method stub
        return null;
    }   



}

Answer 1

简答：片段不能有操作栏，只有活动可以。

更长的答案：Fragment类不包含您尝试使用或覆盖的任何方法。这些是Activity类的所有方法。有关每个课程中可用方法的更多信息，我强烈建议您熟悉the Android developer guides。特别是，您可以使用Activity和Fragment的文档来了解每个类中的方法。

长答案：片段可以将菜单项添加到由ActionBar维护的Activity。为此，您必须覆盖onCreateOptionsMenu (Menu menu, MenuInflater inflater)。请注意此签名与Activity的{{3}}的区别。

为什么我会收到这些错误？

1 个答案: