片段与抽象菜单在行动工具栏中

Question

问题是以下我有我的主要活动，包括抽屉活动，当我提供抽屉活动的一些选项，我必须传递给一个片段，当我传递给片段我的问题是以下失去打开菜单的选项从片段的抽屉

`

public void onCapabilityChanged(CapabilityInfo capabilityInfo) {
        super.onCapabilityChanged(capabilityInfo);
        if(capabilityInfo.getNodes().size() > 0){
            Log.d(TAG, "Device Connected");
        }else{
            Log.d(TAG, "No Devices");
        }
    }

这是java代码的主要活动

这是我想要实现抽屉的片段代码

import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
    }
@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);`