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="1"
                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="1"
                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="1"
                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="1"
                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(0);
        tabHost.setCurrentTab(0);

        //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 == 0){
                    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 == 1){
                    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 == 2){
                    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 == 3){
                    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(0);
                        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(1);
                        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(2);
                        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(3);
                        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！