java - 在 ViewPager 中，我的 Fragment 的适配器是这样的。我希望它是一个数组列表

Question

首先:我使用这个适配器来打包我的 fragment ，它运行良好。但我想使用数组列表来制作它们。第二:我在不同的 ViewPager 中有大约 600 个 fragment ，你知道如何减少一些代码吗？

    // Returns total number of pages
    @Override
    public int getCount() {
        return NUM_ITEMS;
    }

    // Returns the fragment to display for that page
    //*******************
   //*********************
  //********************* I want this dynamic (using ArrayList)
    @Override
    public Fragment getItem(int position) {

        switch (position) {
            case 0: // Fragment # 0 - This will show FirstFragment

                return Word1.newInstance("Word # 1",1);
            case 1: // Fragment # 0 - This will show FirstFragment different title
                return Word2.newInstance("Word # 2",2);
            case 2: // Fragment # 1 - This will show SecondFragment
                return Word3.newInstance("Word # 3",3);
            case 3: // Fragment # 1 - This will show SecondFragment
                return Word4.newInstance("Word # 4",4);

            default:
return Empty.newInstance("Word");

Answer 1

像这样创建寻呼机适配器

public class PagerAdapter extends FragmentPagerAdapter {

private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();

public PagerAdapter(FragmentManager fm, Context context) {
    super(fm);
}

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

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

public void addFragment(Fragment fragment, String title) {
    mFragmentList.add(fragment);
    mFragmentTitleList.add(title);
}

@Override
public CharSequence getPageTitle(int position) {
    return mFragmentTitleList.get(position);
}

}

在您的 Activity 中像这样使用它

 PagerAdapter mPagerAdapterExam = new PagerAdapter(getSupportFragmentManager(), this);

    mPagerAdapterExam.addFragment(new CurrentOrdersFragment(), "Current Orders");
    mPagerAdapterExam.addFragment(new PastOrdersFragment(), "Past Orders");

    mViewPager.setAdapter(mPagerAdapterExam);
    mTabLayout.setupWithViewPager(mViewPager);