package com.android.app_base.base.adapter;
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import androidx.annotation.NonNull;
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import androidx.fragment.app.Fragment;
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import androidx.fragment.app.FragmentActivity;
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import androidx.fragment.app.FragmentManager;
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import androidx.lifecycle.Lifecycle;
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import androidx.viewpager.widget.ViewPager;
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import androidx.viewpager2.adapter.FragmentStateAdapter;
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import androidx.viewpager2.widget.ViewPager2;
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import com.android.app_base.base.view.BaseFragment;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.atomic.AtomicLong;
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/**
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* @author Ljj
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* @date 2023.03.15. 14:36
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* @desc
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*/
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public class BaseVp2FragmentAdapter<F extends BaseFragment> extends FragmentStateAdapter {
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/**
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* Fragment集合
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*/
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private final List<Fragment> mFragmentList = new ArrayList<>();
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/**
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* Fragment 标题
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*/
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private final List<CharSequence> mTitleList = new ArrayList<>();
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private final List<Long> mIds = new ArrayList<>();
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private AtomicLong mAtomicLong = new AtomicLong(0);
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/**
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* 当前显示的Fragment
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*/
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private F mShowFragment;
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/**
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* 当前 ViewPager
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*/
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private ViewPager2 mViewPager;
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public BaseVp2FragmentAdapter(@NonNull FragmentActivity fragmentActivity) {
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super(fragmentActivity);
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}
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public BaseVp2FragmentAdapter(@NonNull Fragment fragment) {
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super(fragment);
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}
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public BaseVp2FragmentAdapter(@NonNull FragmentManager fragmentManager, @NonNull Lifecycle lifecycle) {
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super(fragmentManager, lifecycle);
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}
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@NonNull
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@Override
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public Fragment createFragment(int position) {
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return mFragmentList.get(position);
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}
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@Override
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public int getItemCount() {
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return mFragmentList.size();
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}
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@Override
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public boolean containsItem(long itemId) {
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return mIds.contains(itemId);
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}
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@Override
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public long getItemId(int position) {
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return mIds.get(position);
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}
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public void setFragment(List<F> fragmentList){
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clear();
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for (int i = 0; i < fragmentList.size(); i++) {
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addFragment(fragmentList.get(i));
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}
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}
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/**
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* 添加 Fragment
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*/
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public BaseVp2FragmentAdapter<F> addFragment(F fragment) {
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return addFragment(fragment, null);
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}
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public BaseVp2FragmentAdapter<F> addFragment(Fragment fragment, String title) {
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if (fragment != null) {
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mFragmentList.add(fragment);
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mTitleList.add(title);
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mIds.add(getAtomicGeneratedId());
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notifyDataSetChanged();
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}
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return this;
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}
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/**
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* 添加指定位置的Fragment
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*/
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public BaseVp2FragmentAdapter<F> addFragment(int index, Fragment fragment, String title) {
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if (fragment != null && index >= 0 && index <= mFragmentList.size()) {
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mFragmentList.add(index, fragment);
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mTitleList.add(index, title);
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mIds.add(index, getAtomicGeneratedId());
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notifyDataSetChanged();
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}
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return this;
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}
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/**
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* 删除
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*/
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public BaseVp2FragmentAdapter<F> removeFragment(int index) {
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if (index >= 0 && index < mFragmentList.size()) {
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mFragmentList.remove(index);
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mTitleList.remove(index);
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mIds.remove(index);
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notifyDataSetChanged();
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}
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return this;
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}
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/**
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* 删除所有
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*/
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public BaseVp2FragmentAdapter<F> removeFragmentAll() {
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mFragmentList.clear();
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mTitleList.clear();
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mIds.clear();
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notifyDataSetChanged();
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return this;
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}
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private long getAtomicGeneratedId() {
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return mAtomicLong.incrementAndGet();
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}
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public void clear() {
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mFragmentList.clear();
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mTitleList.clear();
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mIds.clear();
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notifyDataSetChanged();
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}
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public CharSequence getPageTitle(int position) {
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return mTitleList.get(position);
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}
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/**
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* 获取某个 Fragment 的索引（没有就返回 -1）
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*/
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public int getFragmentIndex(Class<? extends Fragment> clazz) {
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if (clazz == null) {
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return -1;
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}
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for (int i = 0; i < mFragmentList.size(); i++) {
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if (clazz.getName().equals(mFragmentList.get(i).getClass().getName())) {
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return i;
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}
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}
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return -1;
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}
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/**
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* 根据 索引 获取某个 Fragment
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*/
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public F getFragment(int index) {
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if (index >= 0 && index < mFragmentList.size()) {
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return (F) mFragmentList.get(index);
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}
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return null;
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}
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}
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