viewpager滑動頁面

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".activity.MainActivity">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="9"
        >
        
    </android.support.v4.view.ViewPager>
    
    <RadioGroup
        android:id="@+id/group"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1.2"
        android:orientation="horizontal"
        android:background="@drawable/bg_homepage_bottom"
        >
        <RadioButton
            android:id="@+id/but1"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:button="@null"
            android:checked="true"
            android:layout_marginTop="22dp"

            android:drawableTop="@drawable/shouye"
            />
        <RadioButton
            android:id="@+id/but2"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:button="@null"
            android:layout_marginTop="22dp"
            android:drawableTop="@drawable/weita"
            />
        <RadioButton
            android:id="@+id/but3"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:button="@null"

            android:drawableTop="@drawable/gwc"
            />
        <RadioButton
            android:id="@+id/but4"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:button="@null"
            android:layout_marginTop="22dp"
            android:drawableTop="@drawable/ino"
            />
        <RadioButton
            android:id="@+id/but5"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:button="@null"
            android:layout_marginTop="22dp"
            android:drawableTop="@drawable/wode"
            />

    </RadioGroup>


</LinearLayout>

package bw.bawei.com.lijimei041.activity;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RadioGroup;

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

import bw.bawei.com.lijimei041.R;
import bw.bawei.com.lijimei041.fragment.FragMentGwc;
import bw.bawei.com.lijimei041.fragment.FragMentHome;
import bw.bawei.com.lijimei041.fragment.FragMentInfo;
import bw.bawei.com.lijimei041.fragment.FragMentWeiTao;
import bw.bawei.com.lijimei041.fragment.FragMentWode;

public class MainActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private RadioGroup radioGroup;

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

        viewPager = findViewById(R.id.viewpager);
        radioGroup = findViewById(R.id.group);

        final List<Fragment> list = new ArrayList<>();
        list.add(new FragMentHome());
        list.add(new FragMentWeiTao());
        list.add(new FragMentGwc());
        list.add(new FragMentInfo());
        list.add(new FragMentWode());

        viewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int i) {
                return list.get(i);
            }

            @Override
            public int getCount() {
                return list.size();
            }
        });
        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int i, float v, int i1) {

            }

            @Override
            public void onPageSelected(int i) {
                radioGroup.check(radioGroup.getChildAt(i).getId());
            }

            @Override
            public void onPageScrollStateChanged(int i) {

            }
        });
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId){
                    case R.id.but1:
                        viewPager.setCurrentItem(0);break;
                    case R.id.but2:
                        viewPager.setCurrentItem(1);break;
                    case R.id.but3:
                        viewPager.setCurrentItem(2);break;
                    case R.id.but4:
                        viewPager.setCurrentItem(3);break;
                    case R.id.but5:
                        viewPager.setCurrentItem(4);break;
                }
            }
        });
    }
}