1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.messaging.ui; 17 18 import android.view.View; 19 import android.view.ViewGroup; 20 21 /** 22 * Holds reusable View(s) for a {@link FixedViewPagerAdapter} to display a page. By using 23 * reusable Views inside ViewPagers this allows us to get rid of nested fragments and the messy 24 * activity lifecycle problems they entail. 25 */ 26 public interface PagerViewHolder extends PersistentInstanceState { 27 /** Instructs the pager to clean up any view related resources 28 * @return the destroyed View so that the adapter may remove it from the container, or 29 * null if no View has been created. */ destroyView()30 View destroyView(); 31 32 /** @return The view that presents the page view to the user */ getView(ViewGroup container)33 View getView(ViewGroup container); 34 } 35