1d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki/* 2d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * Copyright (C) 2016 The Android Open Source Project 3d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * 4d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * Licensed under the Apache License, Version 2.0 (the "License"); 5d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * you may not use this file except in compliance with the License. 6d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * You may obtain a copy of the License at 7d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * 8d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * http://www.apache.org/licenses/LICENSE-2.0 9d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * 10d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * Unless required by applicable law or agreed to in writing, software 11d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * distributed under the License is distributed on an "AS IS" BASIS, 12d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * See the License for the specific language governing permissions and 14d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * limitations under the License. 15d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki */ 16d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki 17d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakipackage com.example.android.support.transition.widget; 18d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki 19d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.animation.Animator; 20d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.animation.ArgbEvaluator; 21d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.animation.ValueAnimator; 22d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.graphics.drawable.ColorDrawable; 23d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.graphics.drawable.Drawable; 24d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.support.annotation.NonNull; 25d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.support.annotation.Nullable; 26d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.support.transition.Transition; 27d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.support.transition.TransitionValues; 28d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.view.View; 29d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakiimport android.view.ViewGroup; 30d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki 31d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki/** 32d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * A sample implementation of support {@link Transition}. 33d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki */ 34d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Arakipublic class ChangeColor extends Transition { 35d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki 36d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki /** Key to store a color value in TransitionValues object */ 37d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki private static final String PROPNAME_BACKGROUND = "transitiondemos:change_color:background"; 38d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki 39d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki /** 40d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * Convenience method: Add the background Drawable property value 41d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki * to the TransitionsValues.value Map for a target. 42d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki */ 43d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki private void captureValues(TransitionValues values) { 44d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // Capture the property values of views for later use 45d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki values.values.put(PROPNAME_BACKGROUND, values.view.getBackground()); 46d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki } 47d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki 48d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki @Override 49d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki public void captureEndValues(@NonNull TransitionValues transitionValues) { 50d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki captureValues(transitionValues); 51d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki } 52d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki 53d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki @Override 54d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki public void captureStartValues(@NonNull TransitionValues transitionValues) { 55d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki captureValues(transitionValues); 56d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki } 57d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki 58d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // Create an animation for each target that is in both the starting and ending Scene. For each 59d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // pair of targets, if their background property value is a color (rather than a graphic), 60d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // create a ValueAnimator based on an ArgbEvaluator that interpolates between the starting and 61d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // ending color. Also create an update listener that sets the View background color for each 62d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // animation frame 63d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki @Nullable 64d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki @Override 65d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki public Animator createAnimator(@NonNull ViewGroup sceneRoot, 66d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki @Nullable TransitionValues startValues, 67d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki @Nullable TransitionValues endValues) { 68d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // This transition can only be applied to views that are on both starting and ending scenes. 69d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki if (null == startValues || null == endValues) { 70d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki return null; 71d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki } 72d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // Store a convenient reference to the target. Both the starting and ending layout have the 73d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // same target. 74d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki final View view = endValues.view; 75d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // Store the object containing the background property for both the starting and ending 76d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // layouts. 77d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki Drawable startBackground = (Drawable) startValues.values.get(PROPNAME_BACKGROUND); 78d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki Drawable endBackground = (Drawable) endValues.values.get(PROPNAME_BACKGROUND); 79d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // This transition changes background colors for a target. It doesn't animate any other 80d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // background changes. If the property isn't a ColorDrawable, ignore the target. 81d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki if (startBackground instanceof ColorDrawable && endBackground instanceof ColorDrawable) { 82d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki ColorDrawable startColor = (ColorDrawable) startBackground; 83d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki ColorDrawable endColor = (ColorDrawable) endBackground; 84d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // If the background color for the target in the starting and ending layouts is 85d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // different, create an animation. 86d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki if (startColor.getColor() != endColor.getColor()) { 87d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // Create a new Animator object to apply to the targets as the transitions framework 88d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // changes from the starting to the ending layout. Use the class ValueAnimator, 89d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // which provides a timing pulse to change property values provided to it. The 90d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // animation runs on the UI thread. The Evaluator controls what type of 91d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // interpolation is done. In this case, an ArgbEvaluator interpolates between two 92d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // #argb values, which are specified as the 2nd and 3rd input arguments. 93d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki ValueAnimator animator = ValueAnimator.ofObject(new ArgbEvaluator(), 94d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki startColor.getColor(), endColor.getColor()); 95d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // Add an update listener to the Animator object. 96d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 97d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki @Override 98d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki public void onAnimationUpdate(ValueAnimator animation) { 99d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki Object value = animation.getAnimatedValue(); 100d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // Each time the ValueAnimator produces a new frame in the animation, change 101d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // the background color of the target. Ensure that the value isn't null. 102d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki if (null != value) { 103d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki view.setBackgroundColor((Integer) value); 104d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki } 105d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki } 106d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki }); 107d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // Return the Animator object to the transitions framework. As the framework changes 108d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // between the starting and ending layouts, it applies the animation you've created. 109d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki return animator; 110d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki } 111d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki } 112d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki // For non-ColorDrawable backgrounds, we just return null, and no animation will take place. 113d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki return null; 114d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki } 115d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki 116d5b720e30a9d82b5f81ec8eac2803e213f2f1c41Yuichi Araki} 117