将数据从一个片段传递到另一个片段|更改ViewPager片段的内容(在ViewPager内部)

Bundle bundle = new Bundle();
bundle.putString("key", "value");

TargetFragment targetFragment = new TargetFragment();
targetFragment.setArguments(bundle);

Bundle bundle = getArguments();
if (bundle != null) {
    String value = bundle.getString("key");
}

public class MyPagerAdapter extends FragmentPagerAdapter {
    private List<Fragment> fragments;

    public MyPagerAdapter(FragmentManager fragmentManager, List<Fragment> fragments) {
        super(fragmentManager);
        this.fragments = fragments;
    }

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

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

ViewPager viewPager = findViewById(R.id.viewPager);
List<Fragment> fragments = new ArrayList<>();
fragments.add(new Fragment1());
fragments.add(new Fragment2());
MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager(), fragments);
viewPager.setAdapter(adapter);

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

    @Override
    public void onPageSelected(int position) {
        Fragment fragment = adapter.getItem(position);
        if (fragment instanceof Fragment1) {
            ((Fragment1) fragment).updateContent();
        } else if (fragment instanceof Fragment2) {
            ((Fragment2) fragment).updateContent();
        }
    }

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