Merge "Adding task open animation in fallback activity" into ub-launcher3-master (3db09e5b) · Commits · e / os / android_packages_apps_Trebuchet

quickstep/src/com/android/launcher3/LauncherAppTransitionManagerImpl.java

+36 −194

Original line number	Diff line number	Diff line
		@@ -19,6 +19,13 @@ package com.android.launcher3;
		import static com.android.launcher3.LauncherAnimUtils.SCALE_PROPERTY;
		import static com.android.launcher3.LauncherState.NORMAL;
		import static com.android.launcher3.allapps.AllAppsTransitionController.ALL_APPS_PROGRESS;
		import static com.android.launcher3.anim.Interpolators.AGGRESSIVE_EASE;
		import static com.android.launcher3.anim.Interpolators.AGGRESSIVE_EASE_IN_OUT;
		import static com.android.launcher3.anim.Interpolators.APP_CLOSE_ALPHA;
		import static com.android.launcher3.anim.Interpolators.LINEAR;
		import static com.android.quickstep.TaskUtils.findTaskViewToLaunch;
		import static com.android.quickstep.TaskUtils.getRecentsWindowAnimator;
		import static com.android.quickstep.TaskUtils.taskIsATargetWithMode;
		import static com.android.systemui.shared.recents.utilities.Utilities.getNextFrameNumber;
		import static com.android.systemui.shared.recents.utilities.Utilities.getSurface;
		import static com.android.systemui.shared.system.RemoteAnimationTargetCompat.MODE_CLOSING;
		@@ -31,7 +38,6 @@ import android.animation.ObjectAnimator;
		import android.animation.ValueAnimator;
		import android.annotation.TargetApi;
		import android.app.ActivityOptions;
		import android.content.ComponentName;
		import android.content.Context;
		import android.content.pm.PackageManager;
		import android.content.res.Resources;
		@@ -45,7 +51,6 @@ import android.util.Log;
		import android.view.Surface;
		import android.view.View;
		import android.view.ViewGroup;
		import android.view.animation.Interpolator;

		import com.android.launcher3.DeviceProfile.OnDeviceProfileChangeListener;
		import com.android.launcher3.InsettableFrameLayout.LayoutParams;
		@@ -55,12 +60,10 @@ import com.android.launcher3.anim.Interpolators;
		import com.android.launcher3.dragndrop.DragLayer;
		import com.android.launcher3.graphics.DrawableFactory;
		import com.android.launcher3.shortcuts.DeepShortcutView;
		import com.android.quickstep.RecentsAnimationInterpolator;
		import com.android.quickstep.RecentsAnimationInterpolator.TaskWindowBounds;
		import com.android.quickstep.util.MultiValueUpdateListener;
		import com.android.quickstep.util.RemoteAnimationProvider;
		import com.android.quickstep.views.RecentsView;
		import com.android.quickstep.views.TaskView;
		import com.android.systemui.shared.recents.model.Task;
		import com.android.systemui.shared.system.ActivityCompat;
		import com.android.systemui.shared.system.ActivityOptionsCompat;
		import com.android.systemui.shared.system.RemoteAnimationAdapterCompat;
		@@ -79,7 +82,7 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		implements OnDeviceProfileChangeListener {

		private static final String TAG = "LauncherTransition";
		private static final int STATUS_BAR_TRANSITION_DURATION = 120;
		public static final int STATUS_BAR_TRANSITION_DURATION = 120;

		private static final String CONTROL_REMOTE_APP_TRANSITION_PERMISSION =
		"android.permission.CONTROL_REMOTE_APP_TRANSITION_ANIMATIONS";
		@@ -87,7 +90,7 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		private static final int APP_LAUNCH_DURATION = 500;
		// Use a shorter duration for x or y translation to create a curve effect
		private static final int APP_LAUNCH_CURVED_DURATION = 233;
		private static final int RECENTS_LAUNCH_DURATION = 336;
		public static final int RECENTS_LAUNCH_DURATION = 336;
		private static final int LAUNCHER_RESUME_START_DELAY = 100;
		private static final int CLOSING_TRANSITION_DURATION_MS = 350;

		@@ -184,64 +187,6 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		mRemoteAnimationProvider = animationProvider;
		}

		/**
		* Try to find a TaskView that corresponds with the component of the launched view.
		*
		* If this method returns a non-null TaskView, it will be used in composeRecentsLaunchAnimation.
		* Otherwise, we will assume we are using a normal app transition, but it's possible that the
		* opening remote target (which we don't get until onAnimationStart) will resolve to a TaskView.
		*/
		private TaskView findTaskViewToLaunch(
		BaseDraggingActivity activity, View v, RemoteAnimationTargetCompat[] targets) {
		if (v instanceof TaskView) {
		return (TaskView) v;
		}
		RecentsView recentsView = activity.getOverviewPanel();

		// It's possible that the launched view can still be resolved to a visible task view, check
		// the task id of the opening task and see if we can find a match.
		if (v.getTag() instanceof ItemInfo) {
		ItemInfo itemInfo = (ItemInfo) v.getTag();
		ComponentName componentName = itemInfo.getTargetComponent();
		if (componentName != null) {
		for (int i = 0; i < recentsView.getChildCount(); i++) {
		TaskView taskView = (TaskView) recentsView.getPageAt(i);
		if (recentsView.isTaskViewVisible(taskView)) {
		Task task = taskView.getTask();
		if (componentName.equals(task.key.getComponent())) {
		return taskView;
		}
		}
		}
		}
		}

		if (targets == null) {
		return null;
		}
		// Resolve the opening task id
		int openingTaskId = -1;
		for (RemoteAnimationTargetCompat target : targets) {
		if (target.mode == MODE_OPENING) {
		openingTaskId = target.taskId;
		break;
		}
		}

		// If there is no opening task id, fall back to the normal app icon launch animation
		if (openingTaskId == -1) {
		return null;
		}

		// If the opening task id is not currently visible in overview, then fall back to normal app
		// icon launch animation
		TaskView taskView = recentsView.getTaskView(openingTaskId);
		if (taskView == null \|\| !recentsView.isTaskViewVisible(taskView)) {
		return null;
		}
		return taskView;
		}

		/**
		* Composes the animations for a launch from the recents list if possible.
		*/
		@@ -285,7 +230,8 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		};
		}

		target.play(getRecentsWindowAnimator(taskView, skipLauncherChanges, targets));
		target.play(getRecentsWindowAnimator(taskView, skipLauncherChanges, targets)
		.setDuration(RECENTS_LAUNCH_DURATION));
		target.play(launcherAnim);

		// Set the current animation first, before adding windowAnimEndListener. Setting current
		@@ -296,83 +242,6 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		return true;
		}

		/**
		* @return Animator that controls the window of the opening targets for the recents launch
		* animation.
		*/
		private ValueAnimator getRecentsWindowAnimator(TaskView v, boolean skipLauncherChanges,
		RemoteAnimationTargetCompat[] targets) {
		final RecentsAnimationInterpolator recentsInterpolator = v.getRecentsInterpolator();

		Rect crop = new Rect();
		Matrix matrix = new Matrix();

		ValueAnimator appAnimator = ValueAnimator.ofFloat(0, 1);
		appAnimator.setDuration(RECENTS_LAUNCH_DURATION);
		appAnimator.setInterpolator(Interpolators.TOUCH_RESPONSE_INTERPOLATOR);
		appAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
		boolean isFirstFrame = true;

		@Override
		public void onAnimationUpdate(ValueAnimator animation) {
		final Surface surface = getSurface(v);
		final long frameNumber = surface != null ? getNextFrameNumber(surface) : -1;
		if (frameNumber == -1) {
		// Booo, not cool! Our surface got destroyed, so no reason to animate anything.
		Log.w(TAG, "Failed to animate, surface got destroyed.");
		return;
		}
		final float percent = animation.getAnimatedFraction();
		TaskWindowBounds tw = recentsInterpolator.interpolate(percent);

		float alphaDuration = 75;
		if (!skipLauncherChanges) {
		v.setScaleX(tw.taskScale);
		v.setScaleY(tw.taskScale);
		v.setTranslationX(tw.taskX);
		v.setTranslationY(tw.taskY);
		// Defer fading out the view until after the app window gets faded in
		v.setAlpha(getValue(1f, 0f, alphaDuration, alphaDuration,
		appAnimator.getDuration() * percent, Interpolators.LINEAR));
		}

		matrix.setScale(tw.winScale, tw.winScale);
		matrix.postTranslate(tw.winX, tw.winY);
		crop.set(tw.winCrop);

		// Fade in the app window.
		float alpha = getValue(0f, 1f, 0, alphaDuration,
		appAnimator.getDuration() * percent, Interpolators.LINEAR);

		TransactionCompat t = new TransactionCompat();
		for (RemoteAnimationTargetCompat target : targets) {
		if (target.mode == RemoteAnimationTargetCompat.MODE_OPENING) {
		t.setAlpha(target.leash, alpha);

		// TODO: This isn't correct at the beginning of the animation, but better
		// than nothing.
		matrix.postTranslate(target.position.x, target.position.y);
		t.setMatrix(target.leash, matrix);
		t.setWindowCrop(target.leash, crop);

		if (!skipLauncherChanges) {
		t.deferTransactionUntil(target.leash, surface, frameNumber);
		}
		}
		if (isFirstFrame) {
		t.show(target.leash);
		}
		}
		t.setEarlyWakeup();
		t.apply();

		matrix.reset();
		isFirstFrame = false;
		}
		});
		return appAnimator;
		}

		/**
		* Content is everything on screen except the background and the floating view (if any).
		*
		@@ -399,9 +268,9 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag

		ObjectAnimator alpha = ObjectAnimator.ofFloat(appsView, View.ALPHA, alphas);
		alpha.setDuration(217);
		alpha.setInterpolator(Interpolators.LINEAR);
		alpha.setInterpolator(LINEAR);
		ObjectAnimator transY = ObjectAnimator.ofFloat(appsView, View.TRANSLATION_Y, trans);
		transY.setInterpolator(Interpolators.AGGRESSIVE_EASE);
		transY.setInterpolator(AGGRESSIVE_EASE);
		transY.setDuration(350);

		launcherAnimator.play(alpha);
		@@ -420,10 +289,10 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag

		ObjectAnimator dragLayerAlpha = ObjectAnimator.ofFloat(mDragLayer, View.ALPHA, alphas);
		dragLayerAlpha.setDuration(217);
		dragLayerAlpha.setInterpolator(Interpolators.LINEAR);
		dragLayerAlpha.setInterpolator(LINEAR);
		ObjectAnimator dragLayerTransY = ObjectAnimator.ofFloat(mDragLayer, View.TRANSLATION_Y,
		trans);
		dragLayerTransY.setInterpolator(Interpolators.AGGRESSIVE_EASE);
		dragLayerTransY.setInterpolator(AGGRESSIVE_EASE);
		dragLayerTransY.setDuration(350);

		launcherAnimator.play(dragLayerAlpha);
		@@ -515,8 +384,8 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		boolean isBelowCenterY = lp.topMargin < centerY;
		x.setDuration(isBelowCenterY ? APP_LAUNCH_DURATION : APP_LAUNCH_CURVED_DURATION);
		y.setDuration(isBelowCenterY ? APP_LAUNCH_CURVED_DURATION : APP_LAUNCH_DURATION);
		x.setInterpolator(Interpolators.AGGRESSIVE_EASE);
		y.setInterpolator(Interpolators.AGGRESSIVE_EASE);
		x.setInterpolator(AGGRESSIVE_EASE);
		y.setInterpolator(AGGRESSIVE_EASE);
		appIconAnimatorSet.play(x);
		appIconAnimatorSet.play(y);

		@@ -534,7 +403,7 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		ObjectAnimator alpha = ObjectAnimator.ofFloat(mFloatingView, View.ALPHA, 1f, 0f);
		alpha.setStartDelay(32);
		alpha.setDuration(50);
		alpha.setInterpolator(Interpolators.LINEAR);
		alpha.setInterpolator(LINEAR);
		appIconAnimatorSet.play(alpha);

		appIconAnimatorSet.addListener(new AnimatorListenerAdapter() {
		@@ -569,11 +438,14 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag

		ValueAnimator appAnimator = ValueAnimator.ofFloat(0, 1);
		appAnimator.setDuration(APP_LAUNCH_DURATION);
		appAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
		appAnimator.addUpdateListener(new MultiValueUpdateListener() {
		// Fade alpha for the app window.
		FloatProp mAlpha = new FloatProp(0f, 1f, 0, 60, LINEAR);

		boolean isFirstFrame = true;

		@Override
		public void onAnimationUpdate(ValueAnimator animation) {
		public void onUpdate(float percent) {
		final Surface surface = getSurface(mFloatingView);
		final long frameNumber = surface != null ? getNextFrameNumber(surface) : -1;
		if (frameNumber == -1) {
		@@ -581,8 +453,7 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		Log.w(TAG, "Failed to animate, surface got destroyed.");
		return;
		}
		final float percent = animation.getAnimatedFraction();
		final float easePercent = Interpolators.AGGRESSIVE_EASE.getInterpolation(percent);
		final float easePercent = AGGRESSIVE_EASE.getInterpolation(percent);

		// Calculate app icon size.
		float iconWidth = bounds.width() * mFloatingView.getScaleX();
		@@ -607,11 +478,6 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		float transY0 = floatingViewBounds[1] - offsetY;
		matrix.postTranslate(transX0, transY0);

		// Fade in the app window.
		float alphaDuration = 60;
		float alpha = getValue(0f, 1f, 0, alphaDuration,
		appAnimator.getDuration() * percent, Interpolators.LINEAR);

		// Animate the window crop so that it starts off as a square, and then reveals
		// horizontally.
		float cropHeight = deviceHeight * easePercent + deviceWidth * (1 - easePercent);
		@@ -624,7 +490,7 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		TransactionCompat t = new TransactionCompat();
		for (RemoteAnimationTargetCompat target : targets) {
		if (target.mode == MODE_OPENING) {
		t.setAlpha(target.leash, alpha);
		t.setAlpha(target.leash, mAlpha.value);

		// TODO: This isn't correct at the beginning of the animation, but better
		// than nothing.
		@@ -670,13 +536,7 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		}

		private boolean launcherIsATargetWithMode(RemoteAnimationTargetCompat[] targets, int mode) {
		int launcherTaskId = mLauncher.getTaskId();
		for (RemoteAnimationTargetCompat target : targets) {
		if (target.mode == mode && target.taskId == launcherTaskId) {
		return true;
		}
		}
		return false;
		return taskIsATargetWithMode(targets, mLauncher.getTaskId(), mode);
		}

		/**
		@@ -730,30 +590,23 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag

		ValueAnimator closingAnimator = ValueAnimator.ofFloat(0, 1);
		closingAnimator.setDuration(CLOSING_TRANSITION_DURATION_MS);
		closingAnimator.addUpdateListener(new MultiValueUpdateListener() {
		FloatProp mDx = new FloatProp(0, endX, 0, 350, AGGRESSIVE_EASE_IN_OUT);
		FloatProp mScale = new FloatProp(1f, 0.8f, 0, 267, AGGRESSIVE_EASE);
		FloatProp mAlpha = new FloatProp(1f, 0f, 0, 350, APP_CLOSE_ALPHA);

		closingAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
		boolean isFirstFrame = true;

		@Override
		public void onAnimationUpdate(ValueAnimator animation) {
		final float percent = animation.getAnimatedFraction();
		float currentPlayTime = percent * closingAnimator.getDuration();

		float scale = getValue(1f, 0.8f, 0, 267, currentPlayTime,
		Interpolators.AGGRESSIVE_EASE);

		float dX = getValue(0, endX, 0, 350, currentPlayTime,
		Interpolators.AGGRESSIVE_EASE_IN_OUT);

		public void onUpdate(float percent) {
		TransactionCompat t = new TransactionCompat();
		for (RemoteAnimationTargetCompat app : targets) {
		if (app.mode == RemoteAnimationTargetCompat.MODE_CLOSING) {
		t.setAlpha(app.leash, getValue(1f, 0f, 0, 350, currentPlayTime,
		Interpolators.APP_CLOSE_ALPHA));
		matrix.setScale(scale, scale,
		t.setAlpha(app.leash, mAlpha.value);
		matrix.setScale(mScale.value, mScale.value,
		app.sourceContainerBounds.centerX(),
		app.sourceContainerBounds.centerY());
		matrix.postTranslate(dX, 0);
		matrix.postTranslate(mDx.value, 0);
		matrix.postTranslate(app.position.x, app.position.y);
		t.setMatrix(app.leash, matrix);
		}
		@@ -772,6 +625,7 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		isFirstFrame = false;
		}
		});

		return closingAnimator;
		}

		@@ -832,16 +686,4 @@ public class LauncherAppTransitionManagerImpl extends LauncherAppTransitionManag
		return mLauncher.checkSelfPermission(CONTROL_REMOTE_APP_TRANSITION_PERMISSION)
		== PackageManager.PERMISSION_GRANTED;
		}

		/**
		* Helper method that allows us to get interpolated values for embedded
		* animations with a delay and/or different duration.
		*/
		private static float getValue(float start, float end, float delay, float duration,
		float currentPlayTime, Interpolator i) {
		float time = Math.max(0, currentPlayTime - delay);
		float newPercent = Math.min(1f, time / duration);
		newPercent = i.getInterpolation(newPercent);
		return end * newPercent + start * (1 - newPercent);
		}
		}

quickstep/src/com/android/quickstep/RecentsActivity.java

+63 −2

Original line number	Diff line number	Diff line
		@@ -15,16 +15,29 @@
		*/
		package com.android.quickstep;

		import static com.android.launcher3.LauncherAppTransitionManagerImpl.RECENTS_LAUNCH_DURATION;
		import static com.android.launcher3.LauncherAppTransitionManagerImpl.STATUS_BAR_TRANSITION_DURATION;
		import static com.android.quickstep.TaskUtils.getRecentsWindowAnimator;
		import static com.android.quickstep.TaskUtils.taskIsATargetWithMode;
		import static com.android.systemui.shared.system.RemoteAnimationTargetCompat.MODE_CLOSING;

		import android.animation.Animator;
		import android.animation.AnimatorListenerAdapter;
		import android.animation.AnimatorSet;
		import android.app.ActivityOptions;
		import android.content.Intent;
		import android.os.Bundle;
		import android.os.Handler;
		import android.os.Looper;
		import android.view.View;

		import com.android.launcher3.BaseDraggingActivity;
		import com.android.launcher3.InvariantDeviceProfile;
		import com.android.launcher3.ItemInfo;
		import com.android.launcher3.LauncherAnimationRunner;
		import com.android.launcher3.LauncherAppState;
		import com.android.launcher3.R;
		import com.android.launcher3.anim.Interpolators;
		import com.android.launcher3.badge.BadgeInfo;
		import com.android.launcher3.uioverrides.UiFactory;
		import com.android.launcher3.util.SystemUiController;
		@@ -32,12 +45,18 @@ import com.android.launcher3.util.Themes;
		import com.android.launcher3.views.BaseDragLayer;
		import com.android.quickstep.fallback.FallbackRecentsView;
		import com.android.quickstep.fallback.RecentsRootView;
		import com.android.quickstep.views.TaskView;
		import com.android.systemui.shared.system.ActivityOptionsCompat;
		import com.android.systemui.shared.system.RemoteAnimationAdapterCompat;
		import com.android.systemui.shared.system.RemoteAnimationRunnerCompat;
		import com.android.systemui.shared.system.RemoteAnimationTargetCompat;

		/**
		* A simple activity to show the recently launched tasks
		*/
		public class RecentsActivity extends BaseDraggingActivity {

		private Handler mUiHandler = new Handler(Looper.getMainLooper());
		private RecentsRootView mRecentsRootView;
		private FallbackRecentsView mFallbackRecentsView;

		@@ -84,10 +103,51 @@ public class RecentsActivity extends BaseDraggingActivity {
		}

		@Override
		public ActivityOptions getActivityLaunchOptions(View v, boolean useDefaultLaunchOptions) {
		public ActivityOptions getActivityLaunchOptions(final View v, boolean useDefaultLaunchOptions) {
		if (useDefaultLaunchOptions \|\| !(v instanceof TaskView)) {
		return null;
		}

		final TaskView taskView = (TaskView) v;
		RemoteAnimationRunnerCompat runner = new LauncherAnimationRunner(mUiHandler) {

		@Override
		public AnimatorSet getAnimator(RemoteAnimationTargetCompat[] targetCompats) {
		return composeRecentsLaunchAnimator(taskView, targetCompats);
		}
		};
		return ActivityOptionsCompat.makeRemoteAnimation(new RemoteAnimationAdapterCompat(
		runner, RECENTS_LAUNCH_DURATION,
		RECENTS_LAUNCH_DURATION - STATUS_BAR_TRANSITION_DURATION));
		}

		/**
		* Composes the animations for a launch from the recents list if possible.
		*/
		private AnimatorSet composeRecentsLaunchAnimator(TaskView taskView,
		RemoteAnimationTargetCompat[] targets) {
		AnimatorSet target = new AnimatorSet();
		boolean activityClosing = taskIsATargetWithMode(targets, getTaskId(), MODE_CLOSING);
		target.play(getRecentsWindowAnimator(taskView, !activityClosing, targets)
		.setDuration(RECENTS_LAUNCH_DURATION));

		// Found a visible recents task that matches the opening app, lets launch the app from there
		if (activityClosing) {
		Animator adjacentAnimation = mFallbackRecentsView
		.createAdjacentPageAnimForTaskLaunch(taskView);
		adjacentAnimation.setInterpolator(Interpolators.TOUCH_RESPONSE_INTERPOLATOR);
		adjacentAnimation.setDuration(RECENTS_LAUNCH_DURATION);
		adjacentAnimation.addListener(new AnimatorListenerAdapter() {
		@Override
		public void onAnimationEnd(Animator animation) {
		mFallbackRecentsView.resetTaskVisuals();
		}
		});
		target.play(adjacentAnimation);
		}
		return target;
		}

		@Override
		public void invalidateParent(ItemInfo info) { }

		@@ -95,6 +155,7 @@ public class RecentsActivity extends BaseDraggingActivity {
		protected void onStart() {
		super.onStart();
		UiFactory.onStart(this);
		mFallbackRecentsView.resetTaskVisuals();
		}

		@Override

quickstep/src/com/android/quickstep/TaskUtils.java

+167 −1

File changed.

Preview size limit exceeded, changes collapsed.

quickstep/src/com/android/quickstep/util/MultiValueUpdateListener.java

0 → 100644

+68 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2018 The Android Open Source Project
		*
		* 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.android.quickstep.util;

		import android.animation.ValueAnimator;
		import android.view.animation.Interpolator;

		import java.util.ArrayList;

		/**
		* Utility class to update multiple values with different interpolators and durations during
		* the same animation.
		*/
		public abstract class MultiValueUpdateListener implements ValueAnimator.AnimatorUpdateListener {

		private final ArrayList<FloatProp> mAllProperties = new ArrayList<>();

		@Override
		public final void onAnimationUpdate(ValueAnimator animator) {
		final float percent = animator.getAnimatedFraction();
		final float currentPlayTime = percent * animator.getDuration();

		for (int i = mAllProperties.size() - 1; i >= 0; i--) {
		FloatProp prop = mAllProperties.get(i);
		float time = Math.max(0, currentPlayTime - prop.mDelay);
		float newPercent = Math.min(1f, time / prop.mDuration);
		newPercent = prop.mInterpolator.getInterpolation(newPercent);
		prop.value = prop.mEnd * newPercent + prop.mStart * (1 - newPercent);
		}
		onUpdate(percent);
		}

		public abstract void onUpdate(float percent);

		public final class FloatProp {

		public float value;

		private final float mStart;
		private final float mEnd;
		private final float mDelay;
		private final float mDuration;
		private final Interpolator mInterpolator;

		public FloatProp(float start, float end, float delay, float duration, Interpolator i) {
		value = mStart = start;
		mEnd = end;
		mDelay = delay;
		mDuration = duration;
		mInterpolator = i;

		mAllProperties.add(this);
		}
		}
		}