1/* 2 * Copyright (C) 2017 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 17package androidx.transition; 18 19import androidx.annotation.NonNull; 20 21/** 22 * This adapter class provides empty implementations of the methods from {@link 23 * Transition.TransitionListener}. 24 * Any custom listener that cares only about a subset of the methods of this listener can 25 * simply subclass this adapter class instead of implementing the interface directly. 26 */ 27public class TransitionListenerAdapter implements Transition.TransitionListener { 28 29 @Override 30 public void onTransitionStart(@NonNull Transition transition) { 31 } 32 33 @Override 34 public void onTransitionEnd(@NonNull Transition transition) { 35 } 36 37 @Override 38 public void onTransitionCancel(@NonNull Transition transition) { 39 } 40 41 @Override 42 public void onTransitionPause(@NonNull Transition transition) { 43 } 44 45 @Override 46 public void onTransitionResume(@NonNull Transition transition) { 47 } 48 49} 50