android - ViewPager.setCurrentItem 在 PagerAdapter 中返回错误的位置

Question

这是我的 tabLayoutCode

mTabLayoutBerita.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
                    @Override
                    public void onTabSelected(TabLayout.Tab tab) {
                        Log.i("onTabSelected", String.valueOf(tab.getPosition()));
                        mViewPagerBerita.setCurrentItem(tab.getPosition());
                    }

                    @Override
                    public void onTabUnselected(TabLayout.Tab tab) {

                    }

                    @Override
                    public void onTabReselected(TabLayout.Tab tab) {

                    }
                });

这是在我的 PagerAdapter 中

public class PagerBerita extends FragmentPagerAdapter {

    private int mNumOfTabs;
    private FragmentBeritaByKategori fragmentBeritaByKategori = null;
    private List<KategoriItem> mDataListKategoriBerita;

    public PagerBerita(FragmentManager fm, int NumOfTabs, List<KategoriItem> mDataListKategoriBerita) {
        super(fm);
        this.mNumOfTabs = NumOfTabs;
        this.mDataListKategoriBerita = mDataListKategoriBerita;
    }

    @Override
    public Fragment getItem(int position) {

        fragmentBeritaByKategori = new FragmentBeritaByKategori(mDataListKategoriBerita.get(position).getId());
        return fragmentBeritaByKategori;
    }

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

I'm trying to create dynamic tab layout, but when the tab already showed up, i get wrong data because the position i use in PagerAdapter is wrong.我已经使用了 setOffscreenPageLimit 并且没有工作，我很困惑。这种情况有什么解决办法吗？非常感谢。

Answer 1

You are forgot to add ViewPager to tab layout.
TabLayout tabsLayout = (TabLayout) findViewById(R.id.tabsLayout);
ViewPager viewpager = (ViewPager) findViewById(R.id.viewpager);
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
viewpager.setAdapter(adapter);

//Add ViewPager to tab layout.
tabsLayout.setupWithViewPager(viewpager);
viewpager.setOffscreenPageLimit(8);

tabsLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewpager.setCurrentItem(tab.getPosition());
                Log.i("TabLayout Position: " + tab.getPosition());

            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

It working fine.