请教一个RadioGroup和ViewPager对应的问题

Question

请问如何点击上面的RadioButton切换底部的ViewPager,或者滑动底部ViewPager的时候选中顶部的RadioButton

public class ChannelFragment extends Fragment {

    @BindView(R.id.rg_tabs)
    RadioGroup mRadioGroup;
    @BindView(R.id.vp_channel)
    ViewPager mViewPager;

    String[] topTitles = {"比赛", "解说", "专栏", "战队", "大神", "比赛", "解说", "专栏", "战队", "大神", "比赛", "解说", "专栏", "战队", "大神"};
    private List<ChannelListBean> mDatas;
    private ChannelAdapter mChannelAdapter;
    private ChannelItemAdapter mChannelItemAdapter;
    private List<TabController> mPageDatas;
    //记录当前选中的tab
    private int mCurrentTab;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_channel, null);
        ButterKnife.bind(this, view);
        initData();
        initEvent();
        return view;
    }

    private void initData() {
            Bitmap a=null;
        //顶部按钮
        for (int i = 0; i < topTitles.length; i++) {
            RadioButton tempButton = new RadioButton(getActivity());
            tempButton.setButtonDrawable(null);           // 设置按钮的样式
            tempButton.setText(topTitles[i]);
            tempButton.setButtonDrawable(new BitmapDrawable(a));
            tempButton.setPadding(30, 10, 30, 10);
            tempButton.setBackgroundResource(R.drawable.channel_title_selector);
            tempButton.setGravity(Gravity.CENTER);
            tempButton.setTextColor(R.drawable.channel_text_color_selector);
            RadioGroup.LayoutParams lp = new RadioGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
            lp.setMargins(15, 0, 15, 0);//设置RadioButton的边距
            mRadioGroup.addView(tempButton, lp);
            if (i == 0) {
                mRadioGroup.check(tempButton.getId());
            }
        }

        mRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // TODO 临时选中
                final RadioButton tempButton = getActivity().findViewById(checkedId); // 通过RadioGroup的findViewById方法，找到ID为checkedID的RadioButton
                final CharSequence buttonText = tempButton.getText();
                mCurrentTab = checkedId;
                tempButton.setOnClickListener(new View.OnClickListener() {//获取每一个RadioButton的点击事件
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(getActivity(), "点击了" + tempButton.getText(), Toast.LENGTH_SHORT).show();
                        if (buttonText.equals("比赛")) {
                            mCurrentTab = 0;
                        } else if (buttonText.equals("解说")) {
                            mCurrentTab = 1;
                        }
                    }
                });
            }
        });

        mPageDatas = new ArrayList<>();

        //加载页面数据
        mPageDatas = new ArrayList<>();
        mPageDatas.add(new GameController(getActivity()));//比赛
        mPageDatas.add(new CommentaryController(getActivity()));//比赛
        //给ViewPager设置Adapter

        mViewPager.setAdapter(new ContentPagerAdapter());
    }

    private void initEvent() {

    }

    /**
     * 整体ViewPager的Adapter
     */
    private class ContentPagerAdapter extends PagerAdapter {

        @Override
        public int getCount() {
            if (mPageDatas != null) {
                return mPageDatas.size();
            }
            return 0;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            BaseController controller = mPageDatas.get(position);
            View rootView = controller.getRootView();
            container.addView(rootView);
            controller.initData();
            return rootView;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((View) object);
        }
    }
}

Answer 1

viewPager.setCurrentItem(position) // 设置当前选中的页面，带滑动动画
viewPager.setCurrenItem(position,false); // 设置当前选中的页面，不带滑动动画



viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset,
                                       int positionOffsetPixels) {}

            @Override
            public void onPageSelected(int position) {
                // ViewPager页面被选中时触发 在此更新顶部对应选中RadioButton 
            }

            @Override
            public void onPageScrollStateChanged(int state) {}
        });

Answer 2

viewpager有setCurrentItem，RadioGroup可以设置check