108 lines
2.9 KiB
Java
108 lines
2.9 KiB
Java
package com.xscm.moduleutil.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.FragmentManager;
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import androidx.fragment.app.FragmentPagerAdapter;
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import java.util.ArrayList;
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import java.util.List;
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/**
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*@author qx
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*@data 2025/6/9
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*@description:可动态添加和删除的viewPage适配器
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*/
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public class CommonPageAdapter extends FragmentPagerAdapter {
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private List<Fragment> mFragmentList = new ArrayList<>();
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private List<Integer> mItemIdList = new ArrayList<>();
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private int id = 0;
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private FragmentManager mFm;
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public CommonPageAdapter(FragmentManager fm, @NonNull List<Fragment> fragmentList) {
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super(fm);
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this.mFm = fm;
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for (Fragment fragment : fragmentList) {
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this.mFragmentList.add(fragment);
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mItemIdList.add(id++);
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}
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}
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public CommonPageAdapter(FragmentManager fm) {
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super(fm);
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}
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public List<Fragment> getFragmentList() {
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return mFragmentList;
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}
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public void addPage(int index, Fragment fragment) {
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mFragmentList.add(index, fragment);
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mItemIdList.add(index, id++);
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notifyDataSetChanged();
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}
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public void addPage(Fragment fragment) {
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mFragmentList.add(fragment);
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mItemIdList.add(id++);
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notifyDataSetChanged();
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}
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public void delPage(int index) {
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mFragmentList.remove(index);
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mItemIdList.remove(index);
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notifyDataSetChanged();
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}
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public void updatePage(List<Fragment> fragmentList) {
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mFragmentList.clear();
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mItemIdList.clear();
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for (int i = 0; i < fragmentList.size(); i++) {
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mFragmentList.add(fragmentList.get(i));
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mItemIdList.add(id++);//注意这里是id++，不是i++。
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}
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notifyDataSetChanged();
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}
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@Override
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public Fragment getItem(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 getCount() {
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return mFragmentList.size();
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}
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/**
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* 返回值有三种，
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* POSITION_UNCHANGED 默认值，位置没有改变
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* POSITION_NONE item已经不存在
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* position item新的位置
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* 当position发生改变时这个方法应该返回改变后的位置，以便页面刷新。
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*/
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@Override
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public int getItemPosition(Object object) {
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if (object instanceof Fragment) {
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if (mFragmentList.contains(object)) {
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return mFragmentList.indexOf(object);
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} else {
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return POSITION_NONE;
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}
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}
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return super.getItemPosition(object);
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}
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public void updateFragments(List<Fragment> newFragments) {
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this.mFragmentList.clear();
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this.mFragmentList.addAll(newFragments);
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notifyDataSetChanged();
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}
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@Override
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public long getItemId(int position) {
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return mItemIdList.get(position);
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}
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} |