Android viewPager的三种使用方式

package com.yun.viewpager; import android.os.Bundle; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import androidx.databinding.DataBindingUtil; import androidx.fragment.app.Fragment; import androidx.fragment.app.FragmentPagerAdapter; import com.yun.viewpager.databinding.ActivityMainBinding; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { private ActivityMainBinding mBinding; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main); setRegularPager(); setCategoryPager(); setFragmentPager(); } private void setRegularPager() { List<String> dataList = new ArrayList<>(); for (int i = 0; i < 4; i++) { dataList.add("这是我的第" + (i + 1) + "个Pager"); } RegularPagerAdapter adapter = new RegularPagerAdapter(this, dataList); mBinding.viewPager1.setAdapter(adapter); } private void setCategoryPager() { ArrayList<ArrayList<ItemBean>> dataList = getCategoryPagerData(8); CategoryPagerAdapter adapter = new CategoryPagerAdapter(this, dataList, 4, (page, position, bean) -> { Toast.makeText(this, "点击：" + bean.getName() + ",位置：" + position, Toast.LENGTH_SHORT).show(); }); mBinding.viewPager2.setAdapter(adapter); } private ArrayList<ArrayList<ItemBean>> getCategoryPagerData(int pageCount) { ArrayList<ArrayList<ItemBean>> dataList = new ArrayList<>(); ArrayList<ItemBean> list = new ArrayList<>(); list.add(new ItemBean("箱包", R.mipmap.icon_bag)); list.add(new ItemBean("美妆", R.mipmap.icon_beauty)); list.add(new ItemBean("图书", R.mipmap.icon_book)); list.add(new ItemBean("电子", R.mipmap.icon_computer)); list.add(new ItemBean("厨具", R.mipmap.icon_cooking)); list.add(new ItemBean("饮品", R.mipmap.icon_drink)); list.add(new ItemBean("水果", R.mipmap.icon_fruits)); list.add(new ItemBean("医药", R.mipmap.icon_medicine)); list.add(new ItemBean("母婴", R.mipmap.icon_mother_and_baby)); list.add(new ItemBean("户外", R.mipmap.icon_outdoors)); list.add(new ItemBean("鞋子", R.mipmap.icon_shoes)); list.add(new ItemBean("女装", R.mipmap.icon_skirt)); list.add(new ItemBean("小家电", R.mipmap.icon_small_appliances)); list.add(new ItemBean("零食", R.mipmap.icon_snacks)); list.add(new ItemBean("男装", R.mipmap.icon_t_shirt)); list.add(new ItemBean("玩具", R.mipmap.icon_toys)); list.add(new ItemBean("蔬菜", R.mipmap.icon_vegetables)); list.add(new ItemBean("风车", R.mipmap.icon_windmill)); int bSize = list.size(); int pageSize = bSize / pageCount + (bSize % pageCount == 0 ? 0 : 1); for (int i = 0; i < pageSize; i++) { ArrayList<ItemBean> itemBeans = new ArrayList<>(); int length = pageCount; if (pageCount > bSize - i * pageCount) { length = bSize - i * pageCount; } for (int j = i * pageCount; j < i * pageCount + length; j++) { itemBeans.add(list.get(j)); } dataList.add(itemBeans); } return dataList; } private PagerFragment fragment1; private PagerFragment fragment2; private PagerFragment fragment3; private List<Fragment> fgList; private void setFragmentPager() { fragment1 = new PagerFragment(1); fragment2 = new PagerFragment(2); fragment3 = new PagerFragment(3); fgList = new ArrayList<>(); fgList.add(fragment1); fgList.add(fragment2); fgList.add(fragment3); mBinding.viewPager3.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) { @Override public Fragment getItem(int position) { return fgList.get(position); } @Override public int getCount() { return fgList.size(); } }); selectPage(0); mBinding.rgPage.setOnCheckedChangeListener((radioGroup, checkedId) -> { if (checkedId == mBinding.rbConfig.getId()) { selectPage(0); } else if (checkedId == mBinding.rbImage.getId()) { selectPage(1); } else if (checkedId == mBinding.rbVideo.getId()) { selectPage(2); } }); } private void selectPage(int index) { mBinding.viewPager3.setCurrentItem(index, false); } }