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 17 package android.graphics.drawable; 18 19 import android.annotation.NonNull; 20 21 /** 22 * Abstract class that drawables supporting animations and callbacks should extend. 23 */ 24 public interface Animatable2 extends Animatable { 25 26 /** 27 * Adds a callback to listen to the animation events. 28 * 29 * @param callback Callback to add. 30 */ registerAnimationCallback(@onNull AnimationCallback callback)31 void registerAnimationCallback(@NonNull AnimationCallback callback); 32 33 /** 34 * Removes the specified animation callback. 35 * 36 * @param callback Callback to remove. 37 * @return {@code false} if callback didn't exist in the call back list, or {@code true} if 38 * callback has been removed successfully. 39 */ unregisterAnimationCallback(@onNull AnimationCallback callback)40 boolean unregisterAnimationCallback(@NonNull AnimationCallback callback); 41 42 /** 43 * Removes all existing animation callbacks. 44 */ clearAnimationCallbacks()45 void clearAnimationCallbacks(); 46 47 public static abstract class AnimationCallback { 48 /** 49 * Called when the animation starts. 50 * 51 * @param drawable The drawable started the animation. 52 */ onAnimationStart(Drawable drawable)53 public void onAnimationStart(Drawable drawable) {}; 54 /** 55 * Called when the animation ends. 56 * 57 * @param drawable The drawable finished the animation. 58 */ onAnimationEnd(Drawable drawable)59 public void onAnimationEnd(Drawable drawable) {}; 60 } 61 } 62