کجای کدم اشتباست(لیست ویو داخل فرگمنت وصل شده به تب)

دوستان عزیز لطفا کمکم کنید کجای کارم اشتباست؟

خطای نال پوینت اکسپشن برای setAdapter میده و فورس کلوس میشه

 package com.example.test;

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

import com.example.adapters.MyFragmentPagerAdapter;
import com.example.adapters.NavListAdapters;
import com.example.fragments.Fragment1;
import com.example.fragments.Fragment2;
import com.example.fragments.Fragment3;
import com.example.models.NavItem;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.support.v7.app.ActionBarActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.HorizontalScrollView;
import android.widget.ListView;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TabHost.TabContentFactory;

public class MainActivity extends ActionBarActivity implements OnPageChangeListener,OnTabChangeListener {
ViewPager viewPager;
TabHost tabHost;
ListView lvNav;
List<NavItem> listnavItems;
List<Fragment> listFragments;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		lvNav = (ListView) findViewById(R.id.list_item);
		listnavItems = new ArrayList<NavItem>();
		listnavItems.add(new NavItem("Home"));
		listnavItems.add(new NavItem("Home"));
		listnavItems.add(new NavItem("Home"));
		listnavItems.add(new NavItem("Home"));
		listnavItems.add(new NavItem("Home"));
		listnavItems.add(new NavItem("Home"));
		listnavItems.add(new NavItem("Home"));

		NavListAdapters navListAdapters = new NavListAdapters(getApplicationContext(), R.layout.item_nav, listnavItems);
		lvNav.setAdapter(navListAdapters);
		listFragments = new ArrayList<Fragment>();
		listFragments.add(new Fragment1());
		FragmentManager fragmentManager = getSupportFragmentManager();
		//fragmentManager.beginTransaction().replace(R.id.title, listFragments.get(0));
		setTitle(listnavItems.get(0).getTitle());
		lvNav.setItemChecked(0, true);
		initViewPager();
		initTabHost();

	}
	
	
	

	private void initTabHost() {
		tabHost = (TabHost) findViewById(android.R.id.tabhost);
		tabHost.setup();
		String[] tabNames = {"Tab 1","Tab 2" , "Tab 3"};
	for(int i = 0 ; i < tabNames.length; i++){
		TabHost.TabSpec tabSpec;
		tabSpec = tabHost.newTabSpec(tabNames[i]);
		tabSpec.setIndicator(tabNames[i]);
		tabSpec.setContent(new FakeContent(getApplicationContext()));
		tabHost.addTab(tabSpec);
		}
	tabHost.setOnTabChangedListener(this);
	}
	
	public class FakeContent implements TabContentFactory{
		Context context;
		public FakeContent(Context mcontext){
			context = mcontext;
		}
		@Override
		public View createTabContent(String arg0) {
			View fakeView = new View(context);
			fakeView.setMinimumHeight(0);
			fakeView.setMinimumWidth(0);
			return fakeView;
		}
		
	}




	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
	
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
	
	public void initViewPager(){
		viewPager = (ViewPager) findViewById(R.id.view_pager);
		
		List<Fragment> liFragments = new ArrayList<>();
		liFragments.add(new Fragment1());
		liFragments.add(new Fragment2());
		liFragments.add(new Fragment3());
		
		MyFragmentPagerAdapter myFragmentPagerAdapter = new MyFragmentPagerAdapter(
				getSupportFragmentManager(), liFragments);
		viewPager.setAdapter(myFragmentPagerAdapter);
		viewPager.setOnPageChangeListener(this); 
		
	}




	@Override
	public void onTabChanged(String arg0) {
		int selectedItem = tabHost.getCurrentTab();
		viewPager.setCurrentItem(selectedItem);
		HorizontalScrollView horizontalScrollView = (HorizontalScrollView) findViewById(R.id.h_scroll_view);
		View tbView = tabHost.getCurrentTabView();
		int scrollPos = tbView.getLeft()
				-(horizontalScrollView.getWidth() - tbView.getWidth())/2;
	horizontalScrollView.smoothScrollTo(scrollPos, 0);
	}




	@Override
	public void onPageScrollStateChanged(int arg0) {
		
	}




	@Override
	public void onPageScrolled(int arg0, float arg1, int arg2) {
		
	}




	@Override
	public void onPageSelected(int selectedItem) {
		tabHost.setCurrentTab(selectedItem);
	}
}

و..........

 package com.example.models;

public class NavItem {
	private String title;
	public NavItem(String title) {
		super();
		this.title = title;
	}
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}

	
}

و........

 package com.example.adapters;

import java.util.List;

import com.example.models.NavItem;
import com.example.test.R;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class NavListAdapters extends ArrayAdapter<NavItem> {
	Context context;
	static int resLayut;
	static List<NavItem> liNavItems;
	public NavListAdapters(Context context, int resource, List<NavItem> objects) {
		super(context, resLayut, liNavItems);
		this.context = context;
		this.resLayut = resLayut;
		this.liNavItems = liNavItems;
	}
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		View v = View.inflate(context, resLayut, null);
		TextView tvTitle = (TextView) v.findViewById(R.id.txt_Item_nav);
		NavItem navItem = liNavItems.get(position);
		tvTitle.setText(navItem.getTitle());
		return v;
		}

}

و.....................

 package com.example.fragments;

import com.example.test.R;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment1 extends Fragment{
	
	@Override
	public View onCreateView(LayoutInflater inflater,
			@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
		View v = inflater.inflate(R.layout.fragment1_layout, container, false);
		return v;
	}

}