ViewPager：传统翻页容器Core 1.20.0-alpha01

<androidx.viewpager.widget.ViewPager
    android:id="@+id/view_pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

import androidx.viewpager.widget.ViewPager;

ViewPager pager = findViewById(R.id.view_pager);
pager.setAdapter(new PagerAdapter() {
    @Override
    public int getCount() { return pages.size(); }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        View page = pages.get(position);
        container.addView(page);
        return page;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }
});

// 监听
pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override public void onPageScrolled(int pos, float offset, int offsetPx) {}
    @Override public void onPageSelected(int pos) {}
    @Override public void onPageScrollStateChanged(int state) {}
});