片段上RecyclerView上的SearchView数据

Question

我想搜索RecyclerView，但在Fragment里面。 我有err：java.lang.NullPointerException：尝试在空对象引用上调用接口方法'android.view.View android.view.MenuItem.getActionView（）' enter image description here

代码Activitymain.Java

package com.example.contact;

import android.support.design.widget.TabLayout;
import android.support.v4.view.MenuItemCompat;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.SearchView;
import android.widget.Toast;

import com.example.contact.adapter.RecyclerViewAdapter;
import com.example.contact.adapter.ViewPagerAdapter;
import com.example.contact.fragment.CallFragment;
import com.example.contact.fragment.ContactFragment;
import com.example.contact.models.Contact;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements SearchView.OnQueryTextListener{
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private ViewPagerAdapter adapter;
    private Toolbar toolbar;
    private ContactFragment contactFragment ;
//    private List<Contact> lstContact = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tabLayout = (TabLayout) findViewById(R.id.tablayout_id);
        viewPager = (ViewPager) findViewById(R.id.viewpager_id);
        adapter = new ViewPagerAdapter(getSupportFragmentManager());

        //Set to toolbar
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowTitleEnabled(false); //Remove Title of Toolbar

        //Add Fragment here
        contactFragment = new ContactFragment();

        adapter.addFragment(new CallFragment(),"GẦN ĐÂY");
        adapter.addFragment(contactFragment, "DANH BẠ");
        viewPager.setAdapter(adapter);

        //Custom tablayout
        tabLayout.setupWithViewPager(viewPager);
        tabLayout.setTabTextColors(getResources().getColor(R.color.colorHintTextLight), getResources().getColor(R.color.colorTextLight));

        /*SearchView searchView = (SearchView)findViewById(R.id.search);
        searchView.setOnSearchClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });*/
    }
    public void msg(View view){
        Toast.makeText(getApplicationContext(), "Click!", Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_toolbar, menu);

        MenuItem menuItem = menu.findItem(R.id.search);
//        SearchView searchView = (SearchView) menuItem.getActionView();
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(menuItem);
        searchView.setOnQueryTextListener(this);
        return true;
    }


    @Override
    public boolean onQueryTextSubmit(String query) {
        return false;
    }

    @Override
    public boolean onQueryTextChange(String newText) {

        String userInput = newText.toLowerCase();
        List<Contact> listNew = new ArrayList<>();
        String name;
        for (int i = 0 ; i< contactFragment.getLstContact().size(); i++){
            name = contactFragment.getLstContact().get(i).getName();
            if(name.toLowerCase().contains(userInput)){
                listNew.add(contactFragment.getLstContact().get(i));
            }
        }


        return false;
    }
}

Fragmentcontact.Java

package com.example.contact.fragment;

import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.contact.models.Contact;
import com.example.contact.R;
import com.example.contact.adapter.RecyclerViewAdapter;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class ContactFragment extends Fragment {
    View v;
    private RecyclerView recyclerView;
    private List<Contact> lstContact;
    public ContactFragment() {
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        v = inflater.inflate(R.layout.contact_fragment, container, false);
        recyclerView = (RecyclerView)v.findViewById(R.id.contact_recyclerview);
        RecyclerViewAdapter adapter = new RecyclerViewAdapter(getContext(), lstContact);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        recyclerView.setAdapter(adapter);
        return v;
    }
    public void loadContacList(){
        //Accessing to contact list and get content
        ContentResolver resolver = getActivity().getContentResolver();
        Cursor cursor = resolver.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
        while (cursor.moveToNext()){
            String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
            String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
            List<String> lstPhoneNumber = new ArrayList<>();
            Cursor phoneCursor = resolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[]{id}, null);
            Log.i("MY INFO", id + " = " + name);

            while (phoneCursor.moveToNext()){
                String phoneNumber = phoneCursor.getString(phoneCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                lstPhoneNumber.add(phoneNumber);
//                Log.i("MY INFO", phoneNumber);
            }

            lstContact.add(new Contact(name, name.substring(0, 1).toUpperCase(), lstPhoneNumber.get(0), R.drawable.contact_image));
        }
        Collections.sort(lstContact, new CustomComparaterLetterContact());
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        lstContact = new ArrayList<>();
        loadContacList();
    }
    //Class to Compare lstContact for letters
    private class CustomComparaterLetterContact implements Comparator<Contact> {

        @Override
        public int compare(Contact o1, Contact o2) {
            return o1.getName().compareToIgnoreCase(o2.getName());
        }
    }

    public List<Contact> getLstContact(){
        return lstContact;
    }


}