ViewPager

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="httpclent.com.example.yuekaotestdemo.MainActivity">

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:id="@+id/rg"
        >
        <RadioButton
            android:id="@+id/rb1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:button="@null"
            android:text="本社介绍"
            android:layout_weight="1"
            android:padding="13dp"
            android:gravity="center"
            />
        <RadioButton
            android:id="@+id/rb2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:button="@null"
            android:text="履行职责"
            android:layout_weight="1"
            android:padding="13dp"
            android:gravity="center"
            />
        <RadioButton
            android:id="@+id/rb3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:button="@null"
            android:text="自我建设"
            android:layout_weight="1"
            android:padding="13dp"
            android:gravity="center"
            />
    </RadioGroup>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:orientation="horizontal"
        android:weightSum="3"
        >
        <View

            android:id="@+id/i"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:background="#ff0000"
            />
    </LinearLayout>


    <android.support.v4.view.ViewPager
        android:layout_marginTop="5dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/vp"
        ></android.support.v4.view.ViewPager>
    


</LinearLayout>

public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {

    private RadioGroup rg;
    private ViewPager vp;
    private RadioButton rb1;
    private RadioButton rb2;
    private RadioButton rb3;
    private View view;
    private List<Fragment> list;
    private MyViewAdapter adapter;

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

        rg = (RadioGroup) findViewById(R.id.rg);
        vp = (ViewPager) findViewById(R.id.vp);
        rb1 = (RadioButton) findViewById(R.id.rb1);
        rb2 = (RadioButton) findViewById(R.id.rb2);
        rb3 = (RadioButton) findViewById(R.id.rb3);

        view = findViewById(R.id.i);
        indata();
        vp.setOffscreenPageLimit(3);
        adapter = new MyViewAdapter(getSupportFragmentManager());
        rg.setOnCheckedChangeListener(this);
        vp.setAdapter(adapter);
        vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

                int i = view.getWidth();
                if (positionOffsetPixels != 0) {
                    view.setX(i * position + positionOffsetPixels / 3);
                }
            }

            @Override
            public void onPageSelected(int position) {

                switch (position) {
                    case 0:
                        rb1.setChecked(true);
                        break;
                    case 1:
                        rb2.setChecked(true);
                        break;
                    case 2:
                        rb3.setChecked(true);
                        break;
                    default:
                        break;


                }

            }
            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });


    }


    private void indata() {
        list = Arrays.asList(new Introduce(), new Responsibilit(), new Construction());

    }

    class MyViewAdapter extends FragmentPagerAdapter {


        public MyViewAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            return list.get(position);
        }

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


    @Override
    public void onCheckedChanged(RadioGroup radioGroup, int i) {
        int num = 0;
        switch (i) {
            case R.id.rb1:
                num = 0;
                break;
            case R.id.rb2:
                num = 1;
                break;
            case R.id.rb3:
                num = 2;
                break;

            default:
                break;

        }
        if (vp.getCurrentItem() != num) {
            vp.setCurrentItem(num);
        }
    }
}