Android ViewPager+TabHost实现首页导航

今天发的是TabHost结合ViewPager实现首页底部导航的效果，虽然说网上有很多这样的Demo，不过呢，我还是要把自己练习写的发出来，没错！就是这么任性；
先上效果图，如下：

代码里面有注释，就不过多解释了，说几点需要注意的问题
1：TabHost 、TabWidget、FrameLayout一定添加id这个属性，否则会报错
android:id=”@android:id/tabhost”
android:id=”@android:id/tabcontent”
android:id=”@android:id/tabs”
这个属性是固定的。
2：ViewPager的适配器要继承PagerAdapter，别整错咯；
布局文件xml：

 <?xml version="1.0" encoding="utf-8"?>
 <TabHost xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@android:id/tabhost"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context="com.example.wgh.tabhostwithviewpager.MainActivity">

     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical">

         <FrameLayout
             android:id="@android:id/tabcontent"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:layout_weight="1.0">

             <android.support.v4.view.ViewPager
                 android:id="@+id/viewPager"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"></android.support.v4.view.ViewPager>

         </FrameLayout>

         <TabWidget
             android:id="@android:id/tabs"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:layout_weight="0.0"
             android:visibility="gone" />

         <View
             android:layout_width="match_parent"
             android:layout_height="1dp"
             android:background="#0ff0f0" />

         <RadioGroup
             android:id="@+id/radioGroup"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"

             android:orientation="horizontal">

             <RadioButton
                 android:id="@+id/radioButton1"
                 android:layout_width="0dp"
                 android:layout_height="wrap_content"
                 android:layout_margin="5dp"
                 android:layout_weight=""
                 android:background="@drawable/img_draw_money_fail"
                 android:button="@null"
                 android:paddingLeft="10dp" />

             <RadioButton
                 android:id="@+id/radioButton2"
                 android:layout_width="0dp"
                 android:layout_height="wrap_content"
                 android:layout_margin="5dp"
                 android:layout_weight=""
                 android:background="@drawable/img_draw_money_fail"
                 android:button="@null" />

             <RadioButton
                 android:id="@+id/radioButton3"
                 android:layout_width="0dp"
                 android:layout_height="wrap_content"
                 android:layout_margin="5dp"
                 android:layout_weight=""
                 android:background="@drawable/img_draw_money_fail"
                 android:button="@null" />

             <RadioButton
                 android:id="@+id/radioButton4"
                 android:layout_width="0dp"
                 android:layout_height="wrap_content"
                 android:layout_margin="5dp"
                 android:layout_weight=""
                 android:background="@drawable/img_draw_money_fail"
                 android:button="@null" />
         </RadioGroup>
     </LinearLayout>
 </TabHost>

Activity：

 package com.example.wgh.tabhostwithviewpager;

 import android.app.TabActivity;
 import android.os.Bundle;
 import android.support.v4.view.ViewPager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.RadioButton;
 import android.widget.RadioGroup;
 import android.widget.TabHost;

 import java.util.ArrayList;

 public class MainActivity extends TabActivity {

     private TabHost tabHost = null;
     private ViewPager viewPager = null;
     private RadioGroup radioGroup = null;
     private ArrayList<View> list = null;
     private View view1 = null;
     private View view2 = null;
     private View view3 = null;
     private View view4 = null;
     private RadioButton radioButton1 = null;
     private RadioButton radioButton2 = null;
     private RadioButton radioButton3 = null;
     private RadioButton radioButton4 = null;

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

         //设置初始化默认选项
         radioGroup.check(R.id.radioButton1);
         radioButton1.setBackgroundResource(R.drawable.img_draw_money_success);
         viewPager.setCurrentItem();
         tabHost.setCurrentTab();

         //getViewPager添加适配器
         MyAdapter adapter = new MyAdapter(list);
         viewPager.setAdapter(adapter);

     /**
      * viewPager设置滑动监听,根据viewPager选中页的position，设置tabHost页卡选项的样式
      */

         viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
             @Override
             public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
             }

             @Override
             public void onPageSelected(int position) {
                 if (position == ){
                     radioButton1.setBackgroundResource(R.drawable.img_draw_money_success);
                     radioButton2.setBackgroundResource(R.drawable.img_draw_money_fail);
                     radioButton3.setBackgroundResource(R.drawable.img_draw_money_fail);
                     radioButton4.setBackgroundResource(R.drawable.img_draw_money_fail);
                 }else if(position == ){
                     radioButton1.setBackgroundResource(R.drawable.img_draw_money_fail);
                     radioButton2.setBackgroundResource(R.drawable.img_draw_money_success);
                     radioButton3.setBackgroundResource(R.drawable.img_draw_money_fail);
                     radioButton4.setBackgroundResource(R.drawable.img_draw_money_fail);
                 }else if(position == ){
                     radioButton1.setBackgroundResource(R.drawable.img_draw_money_fail);
                     radioButton2.setBackgroundResource(R.drawable.img_draw_money_fail);
                     radioButton3.setBackgroundResource(R.drawable.img_draw_money_success);
                     radioButton4.setBackgroundResource(R.drawable.img_draw_money_fail);
                 }else if(position == ){
                     radioButton1.setBackgroundResource(R.drawable.img_draw_money_fail);
                     radioButton2.setBackgroundResource(R.drawable.img_draw_money_fail);
                     radioButton3.setBackgroundResource(R.drawable.img_draw_money_fail);
                     radioButton4.setBackgroundResource(R.drawable.img_draw_money_success);
                 }
             }

             @Override
             public void onPageScrollStateChanged(int state) {
             }
         });

     /**
      * 给radioGroup设置监听，以此来改变ViewPager的页面
      */
         radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
                 switch (checkedId){
                     case R.id.radioButton1:
                         viewPager.setCurrentItem();
                         radioButton1.setBackgroundResource(R.drawable.img_draw_money_success);
                         radioButton2.setBackgroundResource(R.drawable.img_draw_money_fail);
                         radioButton3.setBackgroundResource(R.drawable.img_draw_money_fail);
                         radioButton4.setBackgroundResource(R.drawable.img_draw_money_fail);
                         break;
                     case R.id.radioButton2:
                         viewPager.setCurrentItem();
                         radioButton1.setBackgroundResource(R.drawable.img_draw_money_fail);
                         radioButton2.setBackgroundResource(R.drawable.img_draw_money_success);
                         radioButton3.setBackgroundResource(R.drawable.img_draw_money_fail);
                         radioButton4.setBackgroundResource(R.drawable.img_draw_money_fail);
                         break;
                     case R.id.radioButton3:
                         viewPager.setCurrentItem();
                         radioButton1.setBackgroundResource(R.drawable.img_draw_money_fail);
                         radioButton2.setBackgroundResource(R.drawable.img_draw_money_fail);
                         radioButton3.setBackgroundResource(R.drawable.img_draw_money_success);
                         radioButton4.setBackgroundResource(R.drawable.img_draw_money_fail);
                         break;
                     case R.id.radioButton4:
                         viewPager.setCurrentItem();
                         radioButton1.setBackgroundResource(R.drawable.img_draw_money_fail);
                         radioButton2.setBackgroundResource(R.drawable.img_draw_money_fail);
                         radioButton3.setBackgroundResource(R.drawable.img_draw_money_fail);
                         radioButton4.setBackgroundResource(R.drawable.img_draw_money_success);
                         break;
                 }
             }
         });
     }

     /**
      * 初始化数据源
      */
     private void initData() {
         list = new ArrayList<View>();
         list.add(view1);
         list.add(view2);
         list.add(view3);
         list.add(view4);
     }

      /**
      * 初始化控件
      */
     private void initView() {
         tabHost = getTabHost();

         viewPager = (ViewPager) findViewById(R.id.viewPager);
         radioGroup = (RadioGroup) findViewById(R.id.radioGroup);
         radioButton1 = (RadioButton) findViewById(R.id.radioButton1);
         radioButton2 = (RadioButton) findViewById(R.id.radioButton2);
         radioButton3 = (RadioButton) findViewById(R.id.radioButton3);
         radioButton4 = (RadioButton) findViewById(R.id.radioButton4);
      /**
      * 将每页要展示的layout实例出来，添加到list里面，最后通过适配器return回来要展示的相应的layout
      */
         LayoutInflater inflater = LayoutInflater.from(this);
         view1 = inflater.inflate(R.layout.layout_one,null);
         view2 = inflater.inflate(R.layout.layout_two,null);
         view3 = inflater.inflate(R.layout.layout_three,null);
         view4 = inflater.inflate(R.layout.layout_four,null);
     }

 }

ViewPager适配器MyAdapter：

 public class MyAdapter extends PagerAdapter {
     private ArrayList<View> list = null;

     public MyAdapter(ArrayList<View> list) {
         this.list = list;
     }

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

     @Override
     public boolean isViewFromObject(View arg0, Object arg1) {
         return arg0 == arg1;
     }

     @Override
     public Object instantiateItem(ViewGroup container, int position) {
         container.addView(list.get(position));
         return list.get(position);
     }
     @Override
     public void destroyItem(ViewGroup container, int position, Object object) {

         container.removeView(list.get(position));

     }
 }

如果有什么问题，欢迎留言！