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public class MainActivity extends FragmentActivity {

    private ViewPager vp;
    private List<Fragment> list;
    private Fragment01 fragment01;
    private Fragment02 fragment02;
    private Fragment03 fragment03;
    private Fragment04 fragment04;
    private Fragment05 fragment05;
    private RadioGroup rg;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        vp = findViewById(R.id.vp);
        rg = findViewById(R.id.rg);

        list = new ArrayList<Fragment>();
        fragment01 = new Fragment01();
        fragment02 = new Fragment02();
        fragment03 = new Fragment03();
        fragment04 = new Fragment04();
        fragment05 = new Fragment05();

        list.add(fragment01);
        list.add(fragment02);
        list.add(fragment03);
        list.add(fragment04);
        list.add(fragment05);

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

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

        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int i) {
                switch (i){
                    case R.id.btn1:
                        vp.setCurrentItem(0);
                        break;
                    case R.id.btn2:
                        vp.setCurrentItem(1);
                        break;
                    case R.id.btn3:
                        vp.setCurrentItem(2);
                        break;
                    case R.id.btn4:
                        vp.setCurrentItem(3);
                        break;
                    case R.id.btn5:
                        vp.setCurrentItem(4);
                        break;
                }
            }
        });
        vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                switch (position){
                    case 0:
                        rg.check(R.id.btn1);
                        break;
                    case 1:
                        rg.check(R.id.btn2);
                        break;
                    case 2:
                        rg.check(R.id.btn3);
                        break;
                    case 3:
                        rg.check(R.id.btn4);
                        break;
                    case 4:
                        rg.check(R.id.btn5);
                        break;
                }
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

    }
}

　　

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/vp"
        android:layout_weight="1"
        >


    </android.support.v4.view.ViewPager>
    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/rg"
        android:layout_weight="9"
        android:orientation="horizontal">
        <RadioButton
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/btn1"
            android:layout_weight="1"
            android:gravity="center"
            android:text="首页"
            android:button="@null"/>
        <RadioButton
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/btn2"
            android:layout_weight="1"
            android:gravity="center"
            android:text="想法"
            android:button="@null"/>
        <RadioButton
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/btn3"
            android:layout_weight="1"
            android:gravity="center"
            android:text="市场"
            android:button="@null"/>
        <RadioButton
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/btn4"
            android:layout_weight="1"
            android:gravity="center"
            android:text="通知"
            android:button="@null"/>
        <RadioButton
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/btn5"
            android:layout_weight="1"
            android:gravity="center"
            android:text="更多"
            android:button="@null"/>
    </RadioGroup>
    </LinearLayout>