我正在尝试在android studio上创建标签片段 _Android

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【我正在尝试在android studio上创建标签片段】我得到的错误是第一个，我正在尝试将我的主要活动从一个类转换为一个片段，以便我的导航抽屉可以在页面上工作。但是，这里的问题是cannot resolve methodgetSupportMenuInflater（）。“我相信我可能从代码中遗漏了一些东西，或者我想要实现的目标是不可能的？这个我的代码如下：

public class MainActivity extends Fragment {/** * The {@link android.support.v4.view.PagerAdapter} that will provide * fragments for each of the sections. We use a * {@link FragmentPagerAdapter} derivative, which will keep every * loaded fragment in memory. If this becomes too memory intensive, it * may be best to switch to a * {@link android.support.v4.app.FragmentStatePagerAdapter}. */ private SectionsPagerAdapter mSectionsPagerAdapter; /** * The {@link ViewPager} that will host the section contents. */ private ViewPager mViewPager; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {// Inflate the layout for this fragment View view = inflater.inflate(R.layout.activity_main, container, false); Toolbar toolbar = (Toolbar) view.findViewById(R.id.toolbar); ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar); // Create the adapter that will return a fragment for each of the three // primary sections of the activity. mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager()); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) view.findViewById(R.id.container); mViewPager.setAdapter(mSectionsPagerAdapter); TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tabs); tabLayout.setupWithViewPager(mViewPager); FloatingActionButton fab = (FloatingActionButton) view.findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } }); }@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. MenuInflater inflater = getSupportMenuInflater(); inflater.inflate(R.menu.menu_main, menu); return true; }@Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; }return super.onOptionsItemSelected(item); }/** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { /** * The fragment argument representing the section number for this * fragment. */ private static final String ARG_SECTION_NUMBER = "section_number"; public PlaceholderFragment() { }/** * Returns a new instance of this fragment for the given section * number. */ public static PlaceholderFragment newInstance(int sectionNumber) { PlaceholderFragment fragment = new PlaceholderFragment(); Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); fragment.setArguments(args); return fragment; }@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); TextView textView = (TextView) rootView.findViewById(R.id.section_label); textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER))); return rootView; } }/** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */ public class SectionsPagerAdapter extends FragmentPagerAdapter {public SectionsPagerAdapter(FragmentManager fm) { super(fm); }@Override public Fragment getItem(int position) { // getItem is called to instantiate the fragment for the given page. // Return a PlaceholderFragment (defined as a static inner class below). return PlaceholderFragment.newInstance(position + 1); }@Override public int getCount() { // Show 3 total pages. return 3; }@Override public CharSequence getPageTitle(int position) { switch (position) { case 0: return "SECTION 1"; case 1: return "SECTION 2"; case 2: return "SECTION 3"; } return null; } } }

答案

@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. MenuInflater inflater = getActivity().getMenuInflater(); inflater.inflate(R.menu.menu_main, menu); return true; }