无法应用ViewPager2中的ViewPager2错误androidx…RecycleView.Adapter）

Question

我将旧的viewPager适配器转换为新的viewPager2适配器。将setAdapter设置为viewPager2时出现错误。

setAdapter（androidx.viewpager.widget.RecycleView.Adapter）在ViewPager2无法应用于ViewPagerAdapter

我的[[ViewPagerAdapter

public class ViewPagerAdapter extends FragmentStatePagerAdapter {

    /**
     * Contains all the fragments.
     */
    private List<Fragment> fragments = new ArrayList<>();

    /**
     * Creates a new PagerAdapter instance.
     *
     * @param fragmentManager The FragmentManager.
     */
    public ViewPagerAdapter(FragmentManager fragmentManager) {
        super(fragmentManager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
    }

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

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

    /**
     * Adds the fragment to the list, also adds the fragment's tab title.
     *
     * @param fragment New instance of the Fragment to be associated with this tab.
     */
    public void addFragment(Fragment fragment) {
        fragments.add(fragment);
    }
}

Answer 1

错误的适配器类型需要更改为FragmentStateAdapter https://developer.android.com/reference/androidx/viewpager2/adapter/FragmentStateAdapter

请参见https://developer.android.com/reference/androidx/viewpager2/widget/ViewPager2#setAdapter(androidx.recyclerview.widget.RecyclerView.Adapter)

如果您打算将片段用作页面，请实现FragmentStateAdapter