Need guidance in making efficient swipe views

Question

New to android and recently learned swipe views a bit. In my app, it has 17 chapters and in each chapter, there will be 30 pages containing some text data, a user can swipe through. I need to use FragmentStatePagerAdapter to save memory but I need to know that do I need to make 510 Fragment objects, means 510 XML layout? I just need to change the text in each page, and I've seen many using switch statement like this

@Override
public Fragment getItem(int position) {
    switch (position) {
        case 0:
            return  new FragmentOne();
        case 1:
            return  new FragmentTwo();
        default:
            break;
    }
    return null;
}

Do I/Should I write 30 cases in each chapter? or is there a better way to do this? I've Googled and seen lots of Youtube videos but couldn't find the solution. I request everyone that if you're answering or commenting, do explain your codes cause I believe in learning, not in copy pasting.

Answer 1

It's easy peasy man!

You need only one Fragment object, here's the code

public class FragmentChild extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {

    // INFLATE THE LAYOUT THAT EACH FRAGMENT OBJECT WILL HAVE, PUT IT IN A VIEW
     View root = inflater.inflate(R.layout.couplets, container, false);

    // RECEIVE THE BUNDLE DATA SENT (ARGUMENTS)
    Bundle args = getArguments();

    // CREATE AN ARRAY LIST OF STRINGS THAT WILL HOLD TEXT
    ArrayList<String> someText = new ArrayList<>();
someText.add("one");
someText.add("two");
someText.add("three");
TextView txt = (TextView) root.findViewById(R.id.text_view);
    txt.setText(someText.get(args.getInt("position")));
return root;
}

custom pager adapter

class MyFragmentAdapter extends FragmentStatePagerAdapter {

 MyFragmentAdapter(FragmentManager fm) {super(fm);}

@Override
public Fragment getItem(int position) {
    Bundle args = new Bundle();
    args.putInt("position", position);

    Fragment fragment = new FragmentChild();
    fragment.setArguments(args);
    return fragment;
}

@Override
public int getCount() {
    return 3;
}
}

And finally host activity

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chapter_one);

    // FIND THE VIEWPAGER AND SET THE CUSTOM ADAPTER TO IT TO PROVIDE CHILD PAGES
        ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
        MyFragmentAdapter adapter = new MyFragmentAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);
    }
}