RadioGroup与Vew Pager实现滑动和点击效果

1.xml布局

<?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="com.example.work412.MainActivity">

    <android.support.v4.view.ViewPager
        android:id="@+id/page"
        android:layout_width="match_parent"
        android:layout_weight="9"
        android:layout_height="0dp">

    </android.support.v4.view.ViewPager>

    <RadioGroup
        android:id="@+id/radios"
        android:layout_width="match_parent"
        android:layout_weight="1"
        android:orientation="horizontal"
        android:layout_height="0dp">

        <RadioButton
            android:id="@+id/but01"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="生活"
            android:button="@null"
            android:layout_weight="1"
            android:gravity="center"
            android:checked="true"
            android:background="@drawable/selector"
            />
        <RadioButton
            android:id="@+id/but02"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="娱乐"
            android:button="@null"
            android:layout_weight="1"
            android:gravity="center"
            android:background="@drawable/selector"
            />

    </RadioGroup>

</LinearLayout>

2.MainActivity

private ViewPager viewPager;
private List<Fragment> list;
private RadioGroup radioGroup;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    viewPager=findViewById(R.id.page);
    radioGroup=findViewById(R.id.radios);

    list=new ArrayList<Fragment>();
    list.add(new Fragment01());
    list.add(new Fragment02());
    //设置view pager的适配器
    viewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
        //集合的下标
        @Override
        public Fragment getItem(int position) {
            return list.get(position);
        }
        //返回集合数量
        @Override
        public int getCount() {
            return list.size();
        }
    });

    //点击进行切换
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup radioGroup, int i) {
            switch (i){
                case R.id.but01:
                    //viewPager切换需要用setCurrentItem（）参数是下标
                    viewPager.setCurrentItem(0);
                    break;
                case R.id.but02:
                    viewPager.setCurrentItem(1);
                    break;


            }
        }
    });
    //viewPager的滑动监听事件
    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }
        //选中的
        @Override
        public void onPageSelected(int position) {
            switch (position){
                //根据下标
                case 0:
                    //滑动切换的时候radiofroup也变化.check（）参数是id
                    radioGroup.check(R.id.but01);
                    break;
                case 1:
                    radioGroup.check(R.id.but02);
                    break;

            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });

}