这次的实现的目的其实跟viewpager+view实现的功能一样的，唯一不同的是：这里的viewpager加载的是Fragment。
  其中xml代码与之前的完全一样，所以这里就不贴了。这里我只贴下MainActivity的代码:

package com.example.android_tab3;

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

import com.example.Fragment.AddressFragment;
import com.example.Fragment.FriendFragment;
import com.example.Fragment.SettingFragment;
import com.example.Fragment.WeixinFragment;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends FragmentActivity implements OnClickListener{
    private ViewPager viewpager = null;
    private List<Fragment> list = null;
    private FragmentPagerAdapter adapter = null;
    private ImageButton imagebutton_weixin = null;
    private ImageButton imagebutton_friend = null;
    private ImageButton imagebutton_address = null;
    private ImageButton imagebutton_setting = null;
    
    private LinearLayout linear_weixin = null;
    private LinearLayout linear_friend = null;
    private LinearLayout linear_address = null;
    private LinearLayout linear_setting = null;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        initview();
        initEvents();
    }

    private void initview()
    {
        viewpager = (ViewPager) findViewById(R.id.viewpager);
        
        imagebutton_weixin = (ImageButton) findViewById(R.id.imagebutton_weixin);
        imagebutton_friend = (ImageButton) findViewById(R.id.imagebutton_friend);
        imagebutton_address = (ImageButton) findViewById(R.id.imagebutton_address);
        imagebutton_setting = (ImageButton) findViewById(R.id.imagebutton_setting);
        
        linear_weixin = (LinearLayout) findViewById(R.id.linear_weixin);
        linear_friend = (LinearLayout) findViewById(R.id.linear_friend);
        linear_address = (LinearLayout) findViewById(R.id.linear_address);
        linear_setting = (LinearLayout) findViewById(R.id.linear_setting);
        list = new ArrayList<Fragment>();
        Fragment weixinFragment = new WeixinFragment();
        Fragment friendFragment = new FriendFragment();
        Fragment addressFragment = new AddressFragment();
        Fragment settingFragment = new SettingFragment(); 
        list.add(weixinFragment);
        list.add(friendFragment);
        list.add(addressFragment);
        list.add(settingFragment);
        adapter = new FragmentPagerAdapter(getSupportFragmentManager()) {

            public int getCount() {
    
                return list.size();
            }

            public Fragment getItem(int position) {

                return list.get(position);
            }
        };
        viewpager.setAdapter(adapter);
        viewpager.setOnPageChangeListener(new OnPageChangeListener() {
            
            @Override
            public void onPageSelected(int position) {
                viewpager.setCurrentItem(position);
                resetimage();
                if(position == 0)
                {
                    imagebutton_weixin.setImageResource(R.drawable.tab_weixin_pressed);
                }
                else if(position == 1)
                {
                    imagebutton_friend.setImageResource(R.drawable.tab_find_frd_pressed);
                }
                else if(position == 2)
                {
                    imagebutton_address.setImageResource(R.drawable.tab_address_pressed);
                }
                else if (position == 3) 
                {
                    imagebutton_setting.setImageResource(R.drawable.tab_settings_pressed);
                }
            }
            
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                // TODO Auto-generated method stub
                
            }
            
            @Override
            public void onPageScrollStateChanged(int state) {
                // TODO Auto-generated method stub
                
            }
        });
    }
    private void initEvents() {
        linear_weixin.setOnClickListener(this);
        Log.i("main", "2");
        linear_friend.setOnClickListener(this);
        linear_address.setOnClickListener(this);
        linear_setting.setOnClickListener(this);
    }
    public void onClick(View v) {
        resetimage();
        switch(v.getId())
        {
            case R.id.linear_weixin:
            {
                viewpager.setCurrentItem(0);
                imagebutton_weixin.setImageResource(R.drawable.tab_weixin_pressed);
                break;
            }
            case R.id.linear_friend:
            {
                viewpager.setCurrentItem(1);
                imagebutton_friend.setImageResource(R.drawable.tab_find_frd_pressed);
                break;
            }
            case R.id.linear_address:
            {
                viewpager.setCurrentItem(2);
                imagebutton_address.setImageResource(R.drawable.tab_address_pressed);
                break;
            }
            case R.id.linear_setting:
            {
                viewpager.setCurrentItem(3);
                imagebutton_setting.setImageResource(R.drawable.tab_settings_pressed);
                break;
            }
        }
    }
    private void resetimage()
    {
        imagebutton_weixin.setImageResource(R.drawable.tab_weixin_normal);
        imagebutton_friend.setImageResource(R.drawable.tab_find_frd_normal);
        imagebutton_address.setImageResource(R.drawable.tab_address_normal);
        imagebutton_setting.setImageResource(R.drawable.tab_settings_normal);
    }
}