Java tutorial
/* * Copyright 2017 Zhihu Inc. * * 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. */ package com.zhihu.matisse.internal.ui.adapter; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.view.ViewGroup; import com.zhihu.matisse.internal.entity.Item; import com.zhihu.matisse.internal.ui.PreviewItemFragment; import java.util.ArrayList; import java.util.List; public class PreviewPagerAdapter extends FragmentPagerAdapter { private ArrayList<Item> mItems = new ArrayList<>(); private OnPrimaryItemSetListener mListener; public PreviewPagerAdapter(FragmentManager manager, OnPrimaryItemSetListener listener) { super(manager); mListener = listener; } @Override public Fragment getItem(int position) { return PreviewItemFragment.newInstance(mItems.get(position)); } @Override public int getCount() { return mItems.size(); } @Override public void setPrimaryItem(ViewGroup container, int position, Object object) { super.setPrimaryItem(container, position, object); if (mListener != null) { mListener.onPrimaryItemSet(position); } } public Item getMediaItem(int position) { return mItems.get(position); } public void addAll(List<Item> items) { mItems.addAll(items); } interface OnPrimaryItemSetListener { void onPrimaryItemSet(int position); } }