FragmentTabHost+ViewPager实现底部导航栏

首先使用FragmentTabHost实现底部菜单栏。

content_act_main.xml

MainAct继承自项目框架BasicAct。

    private Class[] tabFragmentArray = {HomeFrg.class, AllGoodFrg.class,
            ShoppingCartFrg.class, PersonalCenterFrg.class};

    private int[] tabStringArray = {R.string.act_main_tab_string_home,R.string.act_main_tab_string_all_good, R.string.act_main_tab_string_shopping_cart, R.string.act_main_tab_string_personal_center};
    private int[] tabImageNoramlArray = {
            R.drawable.ic_tab_home_normal,R.drawable.ic_tab_classfication_normal,
            R.drawable.ic_tab_shoppingcart_normal,R.drawable.ic_tab_userinfo_normal};
    private int[] tabImageSelectedArray = {
            R.drawable.ic_tab_home_selected,R.drawable.ic_tab_classfication_selected,
            R.drawable.ic_tab_shoppingcart_selected,R.drawable.ic_tab_userinfo_selected};

    @Bind (R.id.act_main_tab_host)
    FragmentTabHost fragmentTabHost;

    private LayoutInflater layoutInflater;
    private Fragment[] fragments;

    @Override
    public void initView() {
        layoutInflater = LayoutInflater.from(this);
        fragmentTabHost.setup(this,getSupportFragmentManager(),R.id.act_main_layout_content);

        int count = tabStringArray.length;
        for(int i = 0;i < count;i++){
            TabHost.TabSpec tabSpec ;
            if(i == 0){
                //生成一个tab标签，i=0是默认选中的
                tabSpec = fragmentTabHost.newTabSpec(getString(tabStringArray[i])).setIndicator(getTabItemView(tabImageSelectedArray[i], tabStringArray[i]));
            }else{
                tabSpec = fragmentTabHost.newTabSpec(getString(tabStringArray[i])).setIndicator(getTabItemView(tabImageNoramlArray[i],tabStringArray[i]));

            }

            //给tabspec添加fragment
            fragmentTabHost.addTab(tabSpec,tabFragmentArray[i],null);

        }
    }


    /**
     * 设置每个Tab的上面的文字和图片
     */
    public View getTabItemView(int imageResId,int stringResId){
        View view = layoutInflater.inflate(R.layout.item_main_menu_tab,null);
        ImageView imageView = (ImageView)view.findViewById(R.id.act_main_tab_item_image);
        TextView text = (TextView)view.findViewById(R.id.act_main_tab_item_text);
        imageView.setImageResource(imageResId);
        text.setText(ResUtils.getString(stringResId));
        return view;
    }

此时可以实现fragment的切换

fragment主界面

切换fragment时

可以看到，虽然fragment的内容已经切换了，但是下面的图标和文字并没有进行切换。而且也不支持手势滑动切换。

解决方法

1. 为fragmentTabHost添加点击事件

fragmentTabHost.getTabWidget().getChildTabViewAt(i).setOnClickListener(new TabOnClickListener(fragmentTabHost,i));

TabOnClickListener

    class TabOnClickListener implements View.OnClickListener{

        private FragmentTabHost fragmentTabHost;
        private int index;
        public TabOnClickListener(FragmentTabHost fragmentTabHost,int index){
            this.fragmentTabHost = fragmentTabHost;
            this.index = index;
        }

        @Override
        public void onClick(View v) {
            for(int i = 0 ; i < fragmentTabHost.getTabWidget().getTabCount();i++){
                View view = fragmentTabHost.getTabWidget().getChildAt(i);
                ImageView imageView = (ImageView)view.findViewById(R.id.act_main_tab_item_image);
                if(i == index){
                    imageView.setImageResource(tabImageSelectedArray[i]);
                }else{
                    imageView.setImageResource(tabImageNoramlArray[i]);
                }
                fragmentTabHost.setCurrentTab(index);
            }
        }
    }

此时已经可以实现fragmentTabHost的文字图标切换

文字图标切换

2. ViewPager

为了实现手势滑动切换fragment，需要加入ViewPager组件
content_act_main.xml

此处需要将上述的fragmentTabHost的setup方法进行修改，将其内容容器修改为ViewPager

fragmentTabHost.setup(this,getSupportFragmentManager(),R.id.act_main_view_pager);

在上述代码的基础上，添加

        /**
         * 当点击Tab时，用ViewPager对fragment进行切换，否则fragment将会叠加
         */
        fragmentTabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {
            @Override
            public void onTabChanged(String tabId) {
                int position = fragmentTabHost.getCurrentTab();
                viewPager.setCurrentItem(position);
            }
        });

        HomeFrg homeFrg = new HomeFrg();
        AllGoodFrg allGoodFrg = new AllGoodFrg();
        LatestAnnouncementFrg latestAnnouncementFrg = new LatestAnnouncementFrg();
        ShoppingCartFrg shoppingCartFrg = new ShoppingCartFrg();
        PersonalCenterFrg personalCenterFrg = new PersonalCenterFrg();
        fragments = new Fragment[]{homeFrg,allGoodFrg,latestAnnouncementFrg,shoppingCartFrg,personalCenterFrg};

        fragmentTabHost.setCurrentTab(0);
        viewPager.setOffscreenPageLimit(4);
        viewPager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager()));
        viewPager.setOnPageChangeListener(new ViewPagerListener());

其中需要继承FragmentPagerAdapter和实现OnPagerChangeListener

     /**
     * ViewPager适配器
     * 继承自PagerAdapter，将页面信息持续的保存在fragment manager中，方便用户返回该页面
     */
    class ViewPagerAdapter extends FragmentPagerAdapter{
        public ViewPagerAdapter(android.support.v4.app.FragmentManager fragmentManager){
            super(fragmentManager);
        }
        @Override
        public Fragment getItem(int position) {
            return fragments[position];
        }

        @Override
        public int getCount() {
            return fragments.length;
        }
    }

    /**
     * ViewPager的监听事件
     * 当前选择页面发生变化时的回调接口
     */
    class ViewPagerListener implements ViewPager.OnPageChangeListener{
        @Override
        public void onPageSelected(int position) {
            for(int i = 0;i < fragmentTabHost.getTabWidget().getTabCount();i ++){
                View view = fragmentTabHost.getTabWidget().getChildAt(i);
                ImageView image = (ImageView)view.findViewById(R.id.act_main_tab_item_image);
                TextView text = (TextView)view.findViewById(R.id.act_main_tab_item_text);
                if(i == position){
                    image.setImageResource(tabImageSelectedArray[i]);
                    text.setText(ResUtils.getString(tabStringArray[i]));
                }else{
                    image.setImageResource(tabImageNoramlArray[i]);
                }
            }
            fragmentTabHost.setCurrentTab(position);
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }

        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }
    }

如此，即可实现手势滑动。

手势滑动

所有的源代码如下：

content_act_main.xml

MainAct.java

package com.chenyu.yiyuangou.activity;

import android.content.Context;
import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTabHost;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.TextView;
import com.chenyu.R;
import com.chenyu.core.Utils.ResUtils;
import com.chenyu.core.controller.BasicAct;
import com.chenyu.yiyuangou.fragment.AllGoodFrg;
import com.chenyu.yiyuangou.fragment.HomeFrg;
import com.chenyu.yiyuangou.fragment.LatestAnnouncementFrg;
import com.chenyu.yiyuangou.fragment.PersonalCenterFrg;
import com.chenyu.yiyuangou.fragment.ShoppingCartFrg;

import butterknife.Bind;

public class MainAct extends BasicAct {

    private Class[] tabFragmentArray = {HomeFrg.class, AllGoodFrg.class,LatestAnnouncementFrg.class,
            ShoppingCartFrg.class, PersonalCenterFrg.class};

    private int[] tabStringArray = {R.string.act_main_tab_string_home,R.string.act_main_tab_string_all_good, R.string.act_main_tab_string_latest_announcement,R.string.act_main_tab_string_shopping_cart, R.string.act_main_tab_string_personal_center};
    private int[] tabImageNoramlArray = {
            R.drawable.ic_tab_home_normal,R.drawable.ic_tab_classfication_normal,R.drawable.ic_tab_home_normal,
            R.drawable.ic_tab_shoppingcart_normal,R.drawable.ic_tab_userinfo_normal};
    private int[] tabImageSelectedArray = {
            R.drawable.ic_tab_home_selected,R.drawable.ic_tab_classfication_selected,R.drawable.ic_tab_home_selected,
            R.drawable.ic_tab_shoppingcart_selected,R.drawable.ic_tab_userinfo_selected};

    @Bind (R.id.act_main_tab_host)
    FragmentTabHost fragmentTabHost;
    @Bind(R.id.act_main_view_pager)
    ViewPager viewPager;

    private LayoutInflater layoutInflater;
    private Fragment[] fragments;

    public MainAct(){
        super(R.layout.act_main, R.string.act_main_title);
    }

    public static void startActivity(Context context){
        Intent intent = new Intent(context,MainAct.class);
        context.startActivity(intent);
    }


    @Override
    public void initView() {
        layoutInflater = LayoutInflater.from(this);
        fragmentTabHost.setup(this,getSupportFragmentManager(),R.id.act_main_view_pager);

        int count = tabStringArray.length;
        for(int i = 0;i < count;i++){
            TabHost.TabSpec tabSpec ;
            if(i == 0){
                //生成一个tab标签，i=0是默认选中的
                tabSpec = fragmentTabHost.newTabSpec(getString(tabStringArray[i])).setIndicator(getTabItemView(tabImageSelectedArray[i], tabStringArray[i]));
            }else{
                tabSpec = fragmentTabHost.newTabSpec(getString(tabStringArray[i])).setIndicator(getTabItemView(tabImageNoramlArray[i],tabStringArray[i]));

            }

            //去除分割线
            fragmentTabHost.getTabWidget().setDividerDrawable(null);
            //给tabspec添加fragment
            fragmentTabHost.addTab(tabSpec,tabFragmentArray[i],null);
            //给fragmentTabHost添加点击事件
            fragmentTabHost.getTabWidget().getChildTabViewAt(i).setOnClickListener(new TabOnClickListener(fragmentTabHost,i));
        }

        /**
         * 当点击Tab时，用ViewPager对fragment进行切换，否则fragment将会叠加
         */
        fragmentTabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() {
            @Override
            public void onTabChanged(String tabId) {
                int position = fragmentTabHost.getCurrentTab();
                viewPager.setCurrentItem(position);
            }
        });

        HomeFrg homeFrg = new HomeFrg();
        AllGoodFrg allGoodFrg = new AllGoodFrg();
        LatestAnnouncementFrg latestAnnouncementFrg = new LatestAnnouncementFrg();
        ShoppingCartFrg shoppingCartFrg = new ShoppingCartFrg();
        PersonalCenterFrg personalCenterFrg = new PersonalCenterFrg();
        fragments = new Fragment[]{homeFrg,allGoodFrg,latestAnnouncementFrg,shoppingCartFrg,personalCenterFrg};

        fragmentTabHost.setCurrentTab(0);
        viewPager.setOffscreenPageLimit(4);
        viewPager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager()));
        viewPager.setOnPageChangeListener(new ViewPagerListener());

    }


    /**
     * 设置每个Tab的上面的文字和图片
     */
    public View getTabItemView(int imageResId,int stringResId){
        View view = layoutInflater.inflate(R.layout.item_main_menu_tab,null);
        ImageView imageView = (ImageView)view.findViewById(R.id.act_main_tab_item_image);
        TextView text = (TextView)view.findViewById(R.id.act_main_tab_item_text);
        imageView.setImageResource(imageResId);
        text.setText(ResUtils.getString(stringResId));
        return view;
    }


    /**
     * FragmentTabHost的点击事件
     */
    class TabOnClickListener implements View.OnClickListener{

        private FragmentTabHost fragmentTabHost;
        private int index;
        public TabOnClickListener(FragmentTabHost fragmentTabHost,int index){
            this.fragmentTabHost = fragmentTabHost;
            this.index = index;
        }

        @Override
        public void onClick(View v) {
            for(int i = 0 ; i < fragmentTabHost.getTabWidget().getTabCount();i++){
                View view = fragmentTabHost.getTabWidget().getChildAt(i);
                ImageView imageView = (ImageView)view.findViewById(R.id.act_main_tab_item_image);
                if(i == index){
                    imageView.setImageResource(tabImageSelectedArray[i]);
                }else{
                    imageView.setImageResource(tabImageNoramlArray[i]);
                }
                fragmentTabHost.setCurrentTab(index);
            }
        }
    }

    /**
     * ViewPager适配器
     * 继承自PagerAdapter，将页面信息持续的保存在fragment manager中，方便用户返回该页面
     */
    class ViewPagerAdapter extends FragmentPagerAdapter{
        public ViewPagerAdapter(android.support.v4.app.FragmentManager fragmentManager){
            super(fragmentManager);
        }
        @Override
        public Fragment getItem(int position) {
            return fragments[position];
        }

        @Override
        public int getCount() {
            return fragments.length;
        }
    }

    /**
     * ViewPager的监听事件
     * 当前选择页面发生变化时的回调接口
     */
    class ViewPagerListener implements ViewPager.OnPageChangeListener{
        @Override
        public void onPageSelected(int position) {
            for(int i = 0;i < fragmentTabHost.getTabWidget().getTabCount();i ++){
                View view = fragmentTabHost.getTabWidget().getChildAt(i);
                ImageView image = (ImageView)view.findViewById(R.id.act_main_tab_item_image);
                TextView text = (TextView)view.findViewById(R.id.act_main_tab_item_text);
                if(i == position){
                    image.setImageResource(tabImageSelectedArray[i]);
                    text.setText(ResUtils.getString(tabStringArray[i]));
                }else{
                    image.setImageResource(tabImageNoramlArray[i]);
                }
            }
            fragmentTabHost.setCurrentTab(position);
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }

        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }
    }
}

HomeFrg.java

package com.chenyu.yiyuangou.fragment;

import android.view.View;

import com.chenyu.R;
import com.chenyu.core.controller.BasicFrg;

/**
 * Created by Chenyu on 2016/1/1.
 */
public class HomeFrg extends BasicFrg {
    public HomeFrg(){
        super(R.layout.frg_home);
    }

    @Override
    public void initView(View view) {

    }
}

frg_home.xml

其他四个Fragment也是一样，只是TextView的内容不一样而已。