AnimatorUtils.java

/*
 * Copyright 2015 Google 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.github.takahirom.materialelement.animation.transition;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.animation.ValueAnimator;
import android.graphics.ColorMatrixColorFilter;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.animation.FastOutSlowInInterpolator;
import android.util.ArrayMap;
import android.widget.ImageView;

import com.github.takahirom.materialelement.animation.ObservableColorMatrix;

import java.util.ArrayList;

/**
 * Utility methods for working with animations.
 */
public class AnimatorUtils {

    private AnimatorUtils() {
    }


    /**
     * https://halfthought.wordpress.com/2014/11/07/reveal-transition/
     * <p/>
     * Interrupting Activity transitions can yield an OperationNotSupportedException when the
     * transition tries to pause the animator. Yikes! We can fix this by wrapping the Animator:
     */
    public static class NoPauseAnimator extends Animator {
        private final Animator mAnimator;
        private final ArrayMap<AnimatorListener, AnimatorListener> mListeners = new ArrayMap<>();

        public NoPauseAnimator(Animator animator) {
            mAnimator = animator;
        }

        @Override
        public void addListener(AnimatorListener listener) {
            AnimatorListener wrapper = new AnimatorListenerWrapper(this, listener);
            if (!mListeners.containsKey(listener)) {
                mListeners.put(listener, wrapper);
                mAnimator.addListener(wrapper);
            }
        }

        @Override
        public void cancel() {
            mAnimator.cancel();
        }

        @Override
        public void end() {
            mAnimator.end();
        }

        @Override
        public long getDuration() {
            return mAnimator.getDuration();
        }

        @Override
        public TimeInterpolator getInterpolator() {
            return mAnimator.getInterpolator();
        }

        @Override
        public void setInterpolator(TimeInterpolator timeInterpolator) {
            mAnimator.setInterpolator(timeInterpolator);
        }

        @Override
        public ArrayList<AnimatorListener> getListeners() {
            return new ArrayList<>(mListeners.keySet());
        }

        @Override
        public long getStartDelay() {
            return mAnimator.getStartDelay();
        }

        @Override
        public void setStartDelay(long delayMS) {
            mAnimator.setStartDelay(delayMS);
        }

        @Override
        public boolean isPaused() {
            return mAnimator.isPaused();
        }

        @Override
        public boolean isRunning() {
            return mAnimator.isRunning();
        }

        @Override
        public boolean isStarted() {
            return mAnimator.isStarted();
        }

        /* We don't want to override pause or resume methods because we don't want them
         * to affect mAnimator.
        public void pause();

        public void resume();

        public void addPauseListener(AnimatorPauseListener listener);

        public void removePauseListener(AnimatorPauseListener listener);
        */

        @Override
        public void removeAllListeners() {
            mListeners.clear();
            mAnimator.removeAllListeners();
        }

        @Override
        public void removeListener(AnimatorListener listener) {
            AnimatorListener wrapper = mListeners.get(listener);
            if (wrapper != null) {
                mListeners.remove(listener);
                mAnimator.removeListener(wrapper);
            }
        }

        @Override
        public Animator setDuration(long durationMS) {
            mAnimator.setDuration(durationMS);
            return this;
        }

        @Override
        public void setTarget(Object target) {
            mAnimator.setTarget(target);
        }

        @Override
        public void setupEndValues() {
            mAnimator.setupEndValues();
        }

        @Override
        public void setupStartValues() {
            mAnimator.setupStartValues();
        }

        @Override
        public void start() {
            mAnimator.start();
        }
    }

    private static class AnimatorListenerWrapper implements Animator.AnimatorListener {
        private final Animator mAnimator;
        private final Animator.AnimatorListener mListener;

        AnimatorListenerWrapper(Animator animator, Animator.AnimatorListener listener) {
            mAnimator = animator;
            mListener = listener;
        }

        @Override
        public void onAnimationStart(Animator animator) {
            mListener.onAnimationStart(mAnimator);
        }

        @Override
        public void onAnimationEnd(Animator animator) {
            mListener.onAnimationEnd(mAnimator);
        }

        @Override
        public void onAnimationCancel(Animator animator) {
            mListener.onAnimationCancel(mAnimator);
        }

        @Override
        public void onAnimationRepeat(Animator animator) {
            mListener.onAnimationRepeat(mAnimator);
        }
    }

    public static void startLoadingAnimation(final ImageView loadingImageImageView) {
        // Alpha
        loadingImageImageView.setAlpha(0F);
        loadingImageImageView.animate().setDuration(1000L).alpha(1F);

        // Saturation
        ViewCompat.setHasTransientState(loadingImageImageView, true);
        final ObservableColorMatrix cm = new ObservableColorMatrix();
        ObjectAnimator saturation = ObjectAnimator.ofFloat(
                cm, ObservableColorMatrix.SATURATION, 0f, 1f);
        saturation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener
                () {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                loadingImageImageView.setColorFilter(new ColorMatrixColorFilter(cm));
            }
        });
        saturation.setDuration(2000L);
        saturation.setInterpolator(new FastOutSlowInInterpolator());
        saturation.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                loadingImageImageView.clearColorFilter();
                ViewCompat.setHasTransientState(loadingImageImageView, false);
            }
        });
        saturation.start();
    }

}