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108 changes: 108 additions & 0 deletions
108
...xuexiang/xuidemo/fragment/components/tabbar/tablayout/FragmentStateViewPager2Adapter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| /* | ||
| * Copyright (C) 2020 xuexiangjys([email protected]) | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| */ | ||
|
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| package com.xuexiang.xuidemo.fragment.components.tabbar.tablayout; | ||
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| import androidx.annotation.NonNull; | ||
| import androidx.fragment.app.Fragment; | ||
| import androidx.viewpager2.adapter.FragmentStateAdapter; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.concurrent.atomic.AtomicLong; | ||
|
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| /** | ||
| * @author xuexiang | ||
| * @since 2020/5/21 1:27 AM | ||
| */ | ||
| public class FragmentStateViewPager2Adapter extends FragmentStateAdapter { | ||
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| private List<Fragment> mFragmentList = new ArrayList<>(); | ||
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| private List<String> mTitleList = new ArrayList<>(); | ||
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| private List<Long> mIds = new ArrayList<>(); | ||
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| private AtomicLong mAtomicLong = new AtomicLong(0); | ||
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| public FragmentStateViewPager2Adapter(@NonNull Fragment fragment) { | ||
| super(fragment); | ||
| } | ||
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| @NonNull | ||
| @Override | ||
| public Fragment createFragment(int position) { | ||
| return mFragmentList.get(position); | ||
| } | ||
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| public FragmentStateViewPager2Adapter addFragment(Fragment fragment, String title) { | ||
| if (fragment != null) { | ||
| mFragmentList.add(fragment); | ||
| mTitleList.add(title); | ||
| mIds.add(getAtomicGeneratedId()); | ||
| } | ||
| return this; | ||
| } | ||
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| public FragmentStateViewPager2Adapter addFragment(int index, Fragment fragment, String title) { | ||
| if (fragment != null && index >= 0 && index <= mFragmentList.size()) { | ||
| mFragmentList.add(index, fragment); | ||
| mTitleList.add(index, title); | ||
| mIds.add(index, getAtomicGeneratedId()); | ||
| } | ||
| return this; | ||
| } | ||
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| public FragmentStateViewPager2Adapter removeFragment(int index) { | ||
| if (index >= 0 && index < mFragmentList.size()) { | ||
| mFragmentList.remove(index); | ||
| mTitleList.remove(index); | ||
| mIds.remove(index); | ||
| } | ||
| return this; | ||
| } | ||
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| private long getAtomicGeneratedId() { | ||
| return mAtomicLong.incrementAndGet(); | ||
| } | ||
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| @Override | ||
| public int getItemCount() { | ||
| return mFragmentList.size(); | ||
| } | ||
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| public void clear() { | ||
| mFragmentList.clear(); | ||
| mTitleList.clear(); | ||
| mIds.clear(); | ||
| notifyDataSetChanged(); | ||
| } | ||
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| public CharSequence getPageTitle(int position) { | ||
| return mTitleList.get(position); | ||
| } | ||
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| @Override | ||
| public long getItemId(int position) { | ||
| return mIds.get(position); | ||
| } | ||
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| @Override | ||
| public boolean containsItem(long itemId) { | ||
| return mIds.contains(itemId); | ||
| } | ||
| } |
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