This Transition captures scale and rotation for Views before and after the scene change and animates those changes during the transition. A change in parent is handled as well by capturing the transforms from the parent before and after the scene change and animating those during the transition.

Summary

Fields
from Transition	MATCH_ID, MATCH_INSTANCE, MATCH_ITEM_ID, MATCH_NAME

Constructors
public	ChangeTransform()
public	ChangeTransform(Context context, AttributeSet attrs)

Methods
public abstract void	captureEndValues(TransitionValues transitionValues) Captures the values in the end scene for the properties that this transition monitors.
public abstract void	captureStartValues(TransitionValues transitionValues) Captures the values in the start scene for the properties that this transition monitors.
public Animator	createAnimator(ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues) This method creates an animation that will be run for this transition given the information in the startValues and endValues structures captured earlier for the start and end scenes.
public boolean	getReparent() Returns whether parent changes will be tracked by the ChangeTransform.
public boolean	getReparentWithOverlay() Returns whether changes to parent should use an overlay or not.
public java.lang.String	getTransitionProperties() Returns the set of property names used stored in the TransitionValues object passed into Transition.captureStartValues(TransitionValues) that this transition cares about for the purposes of canceling overlapping animations.
public void	setReparent(boolean reparent) Sets whether parent changes will be tracked by the ChangeTransform.
public void	setReparentWithOverlay(boolean reparentWithOverlay) Sets whether changes to parent should use an overlay or not.
from Transition	addListener, addTarget, animate, cancel, clone, end, excludeChildren, excludeTarget, getDuration, getEpicenter, getEpicenterCallback, getInterpolator, getName, getPathMotion, getPropagation, getRootTransition, getStartDelay, getTargetIds, getTargetNames, getTargets, getTargetTypes, getTransitionValues, isSeekingSupported, isTransitionRequired, pause, removeListener, removeTarget, resume, runAnimators, setDuration, setEpicenterCallback, setInterpolator, setMatchOrder, setPathMotion, setPropagation, setStartDelay, start, toString
from java.lang.Object	equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructors

public ChangeTransform()

public ChangeTransform(Context context, AttributeSet attrs)

Methods

public boolean getReparentWithOverlay()

Returns whether changes to parent should use an overlay or not. When the parent change doesn't use an overlay, it affects the transforms of the child. The default value is true.

Note: when Overlays are not used when a parent changes, a view can be clipped when it moves outside the bounds of its parent. Setting android.view.ViewGroup and android.view.ViewGroup can help. Also, when Overlays are not used and the parent is animating its location, the position of the child view will be relative to its parent's final position, so it may appear to "jump" at the beginning.

Returns:

true when a changed parent should execute the transition inside the scene root's overlay or false if a parent change only affects the transform of the transitioning view.

public void setReparentWithOverlay(boolean reparentWithOverlay)

Sets whether changes to parent should use an overlay or not. When the parent change doesn't use an overlay, it affects the transforms of the child. The default value is true.

Parameters:

reparentWithOverlay: true when a changed parent should execute the transition inside the scene root's overlay or false if a parent change only affects the transform of the transitioning view.

public boolean getReparent()

Returns whether parent changes will be tracked by the ChangeTransform. If parent changes are tracked, then the transform will adjust to the transforms of the different parents. If they aren't tracked, only the transforms of the transitioning view will be tracked. Default is true.

Returns:

whether parent changes will be tracked by the ChangeTransform.

public void setReparent(boolean reparent)

Sets whether parent changes will be tracked by the ChangeTransform. If parent changes are tracked, then the transform will adjust to the transforms of the different parents. If they aren't tracked, only the transforms of the transitioning view will be tracked. Default is true.

Parameters:

reparent: Set to true to track parent changes or false to only track changes of the transitioning view without considering the parent change.

public java.lang.String getTransitionProperties()

Returns the set of property names used stored in the TransitionValues object passed into Transition.captureStartValues(TransitionValues) that this transition cares about for the purposes of canceling overlapping animations. When any transition is started on a given scene root, all transitions currently running on that same scene root are checked to see whether the properties on which they based their animations agree with the end values of the same properties in the new transition. If the end values are not equal, then the old animation is canceled since the new transition will start a new animation to these new values. If the values are equal, the old animation is allowed to continue and no new animation is started for that transition.

A transition does not need to override this method. However, not doing so will mean that the cancellation logic outlined in the previous paragraph will be skipped for that transition, possibly leading to artifacts as old transitions and new transitions on the same targets run in parallel, animating views toward potentially different end values.

Returns:

An array of property names as described in the class documentation for TransitionValues. The default implementation returns null.

public abstract void captureStartValues(TransitionValues transitionValues)

Captures the values in the start scene for the properties that this transition monitors. These values are then passed as the startValues structure in a later call to Transition.createAnimator(ViewGroup, TransitionValues, TransitionValues). The main concern for an implementation is what the properties are that the transition cares about and what the values are for all of those properties. The start and end values will be compared later during the Transition.createAnimator(ViewGroup, TransitionValues, TransitionValues) method to determine what, if any, animations, should be run.

Subclasses must implement this method. The method should only be called by the transition system; it is not intended to be called from external classes.

Parameters:

transitionValues: The holder for any values that the Transition wishes to store. Values are stored in the values field of this TransitionValues object and are keyed from a String value. For example, to store a view's rotation value, a transition might call transitionValues.values.put("appname:transitionname:rotation", view.getRotation()). The target view will already be stored in the transitionValues structure when this method is called.

public abstract void captureEndValues(TransitionValues transitionValues)

Captures the values in the end scene for the properties that this transition monitors. These values are then passed as the endValues structure in a later call to Transition.createAnimator(ViewGroup, TransitionValues, TransitionValues). The main concern for an implementation is what the properties are that the transition cares about and what the values are for all of those properties. The start and end values will be compared later during the Transition.createAnimator(ViewGroup, TransitionValues, TransitionValues) method to determine what, if any, animations, should be run.

Subclasses must implement this method. The method should only be called by the transition system; it is not intended to be called from external classes.

Parameters:

public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues)

This method creates an animation that will be run for this transition given the information in the startValues and endValues structures captured earlier for the start and end scenes. Subclasses of Transition should override this method. The method should only be called by the transition system; it is not intended to be called from external classes.

This method is called by the transition's parent (all the way up to the topmost Transition in the hierarchy) with the sceneRoot and start/end values that the transition may need to set up initial target values and construct an appropriate animation. For example, if an overall Transition is a TransitionSet consisting of several child transitions in sequence, then some of the child transitions may want to set initial values on target views prior to the overall Transition commencing, to put them in an appropriate state for the delay between that start and the child Transition start time. For example, a transition that fades an item in may wish to set the starting alpha value to 0, to avoid it blinking in prior to the transition actually starting the animation. This is necessary because the scene change that triggers the Transition will automatically set the end-scene on all target views, so a Transition that wants to animate from a different value should set that value prior to returning from this method.

Additionally, a Transition can perform logic to determine whether the transition needs to run on the given target and start/end values. For example, a transition that resizes objects on the screen may wish to avoid running for views which are not present in either the start or end scenes.

If there is an animator created and returned from this method, the transition mechanism will apply any applicable duration, startDelay, and interpolator to that animation and start it. A return value of null indicates that no animation should run. The default implementation returns null.

The method is called for every applicable target object, which is stored in the TransitionValues.view field.

Parameters:

sceneRoot: The root of the transition hierarchy.
startValues: The values for a specific target in the start scene.
endValues: The values for the target in the end scene.

Returns:

A Animator to be started at the appropriate time in the overall transition for this scene change. A null value means no animation should be run.

Source

/*
 * Copyright (C) 2017 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 androidx.transition;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Matrix;
import android.graphics.Path;
import android.graphics.PointF;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Property;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.content.res.TypedArrayUtils;
import androidx.core.view.ViewCompat;

import org.xmlpull.v1.XmlPullParser;

/**
 * This Transition captures scale and rotation for Views before and after the
 * scene change and animates those changes during the transition.
 *
 * A change in parent is handled as well by capturing the transforms from
 * the parent before and after the scene change and animating those during the
 * transition.
 */
public class ChangeTransform extends Transition {

    private static final String PROPNAME_MATRIX = "android:changeTransform:matrix";
    private static final String PROPNAME_TRANSFORMS = "android:changeTransform:transforms";
    private static final String PROPNAME_PARENT = "android:changeTransform:parent";
    private static final String PROPNAME_PARENT_MATRIX = "android:changeTransform:parentMatrix";
    private static final String PROPNAME_INTERMEDIATE_PARENT_MATRIX =
            "android:changeTransform:intermediateParentMatrix";
    private static final String PROPNAME_INTERMEDIATE_MATRIX =
            "android:changeTransform:intermediateMatrix";

    private static final String[] sTransitionProperties = {
            PROPNAME_MATRIX,
            PROPNAME_TRANSFORMS,
            PROPNAME_PARENT_MATRIX,
    };

    /**
     * This property sets the animation matrix properties that are not translations.
     */
    private static final Property<PathAnimatorMatrix, float[]> NON_TRANSLATIONS_PROPERTY =
            new Property<PathAnimatorMatrix, float[]>(float[].class, "nonTranslations") {
                @Override
                public float[] get(PathAnimatorMatrix object) {
                    return null;
                }

                @Override
                public void set(PathAnimatorMatrix object, float[] value) {
                    object.setValues(value);
                }
            };

    /**
     * This property sets the translation animation matrix properties.
     */
    private static final Property<PathAnimatorMatrix, PointF> TRANSLATIONS_PROPERTY =
            new Property<PathAnimatorMatrix, PointF>(PointF.class, "translations") {
                @Override
                public PointF get(PathAnimatorMatrix object) {
                    return null;
                }

                @Override
                public void set(PathAnimatorMatrix object, PointF value) {
                    object.setTranslation(value);
                }
            };

    /**
     * Newer platforms suppress view removal at the beginning of the animation.
     */
    private static final boolean SUPPORTS_VIEW_REMOVAL_SUPPRESSION = Build.VERSION.SDK_INT >= 21;

    @SuppressWarnings("WeakerAccess") /* synthetic access */
    boolean mUseOverlay = true;
    private boolean mReparent = true;
    private Matrix mTempMatrix = new Matrix();

    public ChangeTransform() {
    }

    public ChangeTransform(@NonNull Context context, @NonNull AttributeSet attrs) {
        super(context, attrs);
        TypedArray a = context.obtainStyledAttributes(attrs, Styleable.CHANGE_TRANSFORM);
        mUseOverlay = TypedArrayUtils.getNamedBoolean(a, (XmlPullParser) attrs,
                "reparentWithOverlay", Styleable.ChangeTransform.REPARENT_WITH_OVERLAY, true);
        mReparent = TypedArrayUtils.getNamedBoolean(a, (XmlPullParser) attrs,
                "reparent", Styleable.ChangeTransform.REPARENT, true);
        a.recycle();
    }

    /**
     * Returns whether changes to parent should use an overlay or not. When the parent
     * change doesn't use an overlay, it affects the transforms of the child. The
     * default value is <code>true</code>.
     *
     * <p>Note: when Overlays are not used when a parent changes, a view can be clipped when
     * it moves outside the bounds of its parent. Setting
     * {@link android.view.ViewGroup#setClipChildren(boolean)} and
     * {@link android.view.ViewGroup#setClipToPadding(boolean)} can help. Also, when
     * Overlays are not used and the parent is animating its location, the position of the
     * child view will be relative to its parent's final position, so it may appear to "jump"
     * at the beginning.</p>
     *
     * @return <code>true</code> when a changed parent should execute the transition
     * inside the scene root's overlay or <code>false</code> if a parent change only
     * affects the transform of the transitioning view.
     */
    public boolean getReparentWithOverlay() {
        return mUseOverlay;
    }

    /**
     * Sets whether changes to parent should use an overlay or not. When the parent
     * change doesn't use an overlay, it affects the transforms of the child. The
     * default value is <code>true</code>.
     *
     * <p>Note: when Overlays are not used when a parent changes, a view can be clipped when
     * it moves outside the bounds of its parent. Setting
     * {@link android.view.ViewGroup#setClipChildren(boolean)} and
     * {@link android.view.ViewGroup#setClipToPadding(boolean)} can help. Also, when
     * Overlays are not used and the parent is animating its location, the position of the
     * child view will be relative to its parent's final position, so it may appear to "jump"
     * at the beginning.</p>
     *
     * @param reparentWithOverlay <code>true</code> when a changed parent should execute the
     *                            transition inside the scene root's overlay or <code>false</code>
     *                            if a parent change only affects the transform of the
     *                            transitioning view.
     */
    public void setReparentWithOverlay(boolean reparentWithOverlay) {
        mUseOverlay = reparentWithOverlay;
    }

    /**
     * Returns whether parent changes will be tracked by the ChangeTransform. If parent
     * changes are tracked, then the transform will adjust to the transforms of the
     * different parents. If they aren't tracked, only the transforms of the transitioning
     * view will be tracked. Default is true.
     *
     * @return whether parent changes will be tracked by the ChangeTransform.
     */
    public boolean getReparent() {
        return mReparent;
    }

    /**
     * Sets whether parent changes will be tracked by the ChangeTransform. If parent
     * changes are tracked, then the transform will adjust to the transforms of the
     * different parents. If they aren't tracked, only the transforms of the transitioning
     * view will be tracked. Default is true.
     *
     * @param reparent Set to true to track parent changes or false to only track changes
     *                 of the transitioning view without considering the parent change.
     */
    public void setReparent(boolean reparent) {
        mReparent = reparent;
    }

    @Override
    @NonNull
    public String[] getTransitionProperties() {
        return sTransitionProperties;
    }

    private void captureValues(TransitionValues transitionValues) {
        View view = transitionValues.view;
        if (view.getVisibility() == View.GONE) {
            return;
        }
        transitionValues.values.put(PROPNAME_PARENT, view.getParent());
        Transforms transforms = new Transforms(view);
        transitionValues.values.put(PROPNAME_TRANSFORMS, transforms);
        Matrix matrix = view.getMatrix();
        if (matrix == null || matrix.isIdentity()) {
            matrix = null;
        } else {
            matrix = new Matrix(matrix);
        }
        transitionValues.values.put(PROPNAME_MATRIX, matrix);
        if (mReparent) {
            Matrix parentMatrix = new Matrix();
            ViewGroup parent = (ViewGroup) view.getParent();
            ViewUtils.transformMatrixToGlobal(parent, parentMatrix);
            parentMatrix.preTranslate(-parent.getScrollX(), -parent.getScrollY());
            transitionValues.values.put(PROPNAME_PARENT_MATRIX, parentMatrix);
            transitionValues.values.put(PROPNAME_INTERMEDIATE_MATRIX,
                    view.getTag(R.id.transition_transform));
            transitionValues.values.put(PROPNAME_INTERMEDIATE_PARENT_MATRIX,
                    view.getTag(R.id.parent_matrix));
        }
    }

    @Override
    public void captureStartValues(@NonNull TransitionValues transitionValues) {
        captureValues(transitionValues);
        if (!SUPPORTS_VIEW_REMOVAL_SUPPRESSION) {
            // We still don't know if the view is removed or not, but we need to do this here, or
            // the view will be actually removed, resulting in flickering at the beginning of the
            // animation. We are canceling this afterwards.
            ((ViewGroup) transitionValues.view.getParent()).startViewTransition(
                    transitionValues.view);
        }
    }

    @Override
    public void captureEndValues(@NonNull TransitionValues transitionValues) {
        captureValues(transitionValues);
    }

    @Nullable
    @Override
    public Animator createAnimator(@NonNull ViewGroup sceneRoot,
            @Nullable TransitionValues startValues,
            @Nullable TransitionValues endValues) {
        if (startValues == null || endValues == null
                || !startValues.values.containsKey(PROPNAME_PARENT)
                || !endValues.values.containsKey(PROPNAME_PARENT)) {
            return null;
        }

        ViewGroup startParent = (ViewGroup) startValues.values.get(PROPNAME_PARENT);
        ViewGroup endParent = (ViewGroup) endValues.values.get(PROPNAME_PARENT);
        boolean handleParentChange = mReparent && !parentsMatch(startParent, endParent);

        Matrix startMatrix = (Matrix) startValues.values.get(PROPNAME_INTERMEDIATE_MATRIX);
        if (startMatrix != null) {
            startValues.values.put(PROPNAME_MATRIX, startMatrix);
        }

        Matrix startParentMatrix = (Matrix)
                startValues.values.get(PROPNAME_INTERMEDIATE_PARENT_MATRIX);
        if (startParentMatrix != null) {
            startValues.values.put(PROPNAME_PARENT_MATRIX, startParentMatrix);
        }

        // First handle the parent change:
        if (handleParentChange) {
            setMatricesForParent(startValues, endValues);
        }

        // Next handle the normal matrix transform:
        ObjectAnimator transformAnimator = createTransformAnimator(startValues, endValues,
                handleParentChange);

        if (handleParentChange && transformAnimator != null && mUseOverlay) {
            createGhostView(sceneRoot, startValues, endValues);
        } else if (!SUPPORTS_VIEW_REMOVAL_SUPPRESSION) {
            // We didn't need to suppress the view removal in this case. Cancel the suppression.
            startParent.endViewTransition(startValues.view);
        }

        return transformAnimator;
    }

    private ObjectAnimator createTransformAnimator(TransitionValues startValues,
            TransitionValues endValues, final boolean handleParentChange) {
        Matrix startMatrix = (Matrix) startValues.values.get(PROPNAME_MATRIX);
        Matrix endMatrix = (Matrix) endValues.values.get(PROPNAME_MATRIX);

        if (startMatrix == null) {
            startMatrix = MatrixUtils.IDENTITY_MATRIX;
        }

        if (endMatrix == null) {
            endMatrix = MatrixUtils.IDENTITY_MATRIX;
        }

        if (startMatrix.equals(endMatrix)) {
            return null;
        }

        final Transforms transforms = (Transforms) endValues.values.get(PROPNAME_TRANSFORMS);

        // clear the transform properties so that we can use the animation matrix instead
        final View view = endValues.view;
        setIdentityTransforms(view);

        final float[] startMatrixValues = new float[9];
        startMatrix.getValues(startMatrixValues);
        final float[] endMatrixValues = new float[9];
        endMatrix.getValues(endMatrixValues);
        final PathAnimatorMatrix pathAnimatorMatrix =
                new PathAnimatorMatrix(view, startMatrixValues);

        PropertyValuesHolder valuesProperty = PropertyValuesHolder.ofObject(
                NON_TRANSLATIONS_PROPERTY, new FloatArrayEvaluator(new float[9]),
                startMatrixValues, endMatrixValues);
        Path path = getPathMotion().getPath(startMatrixValues[Matrix.MTRANS_X],
                startMatrixValues[Matrix.MTRANS_Y], endMatrixValues[Matrix.MTRANS_X],
                endMatrixValues[Matrix.MTRANS_Y]);
        PropertyValuesHolder translationProperty = PropertyValuesHolderUtils.ofPointF(
                TRANSLATIONS_PROPERTY, path);
        ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(pathAnimatorMatrix,
                valuesProperty, translationProperty);

        Listener listener = new Listener(view, transforms, pathAnimatorMatrix, endMatrix,
                handleParentChange, mUseOverlay);

        animator.addListener(listener);
        animator.addPauseListener(listener);
        return animator;
    }

    private boolean parentsMatch(ViewGroup startParent, ViewGroup endParent) {
        boolean parentsMatch = false;
        if (!isValidTarget(startParent) || !isValidTarget(endParent)) {
            parentsMatch = startParent == endParent;
        } else {
            TransitionValues endValues = getMatchedTransitionValues(startParent, true);
            if (endValues != null) {
                parentsMatch = endParent == endValues.view;
            }
        }
        return parentsMatch;
    }

    private void createGhostView(final ViewGroup sceneRoot, TransitionValues startValues,
            TransitionValues endValues) {
        View view = endValues.view;

        Matrix endMatrix = (Matrix) endValues.values.get(PROPNAME_PARENT_MATRIX);
        Matrix localEndMatrix = new Matrix(endMatrix);
        ViewUtils.transformMatrixToLocal(sceneRoot, localEndMatrix);

        GhostView ghostView = GhostViewUtils.addGhost(view, sceneRoot, localEndMatrix);
        if (ghostView == null) {
            return;
        }
        // Ask GhostView to actually remove the start view when it starts drawing the animation.
        ghostView.reserveEndViewTransition((ViewGroup) startValues.values.get(PROPNAME_PARENT),
                startValues.view);

        Transition outerTransition = this;
        while (outerTransition.mParent != null) {
            outerTransition = outerTransition.mParent;
        }

        GhostListener listener = new GhostListener(view, ghostView);
        outerTransition.addListener(listener);

        // We cannot do this for older platforms or it invalidates the view and results in
        // flickering, but the view will still be invisible by actually removing it from the parent.
        if (SUPPORTS_VIEW_REMOVAL_SUPPRESSION) {
            if (startValues.view != endValues.view) {
                ViewUtils.setTransitionAlpha(startValues.view, 0);
            }
            ViewUtils.setTransitionAlpha(view, 1);
        }
    }

    private void setMatricesForParent(TransitionValues startValues, TransitionValues endValues) {
        Matrix endParentMatrix = (Matrix) endValues.values.get(PROPNAME_PARENT_MATRIX);
        endValues.view.setTag(R.id.parent_matrix, endParentMatrix);

        Matrix toLocal = mTempMatrix;
        toLocal.reset();
        endParentMatrix.invert(toLocal);

        Matrix startLocal = (Matrix) startValues.values.get(PROPNAME_MATRIX);
        if (startLocal == null) {
            startLocal = new Matrix();
            startValues.values.put(PROPNAME_MATRIX, startLocal);
        }

        Matrix startParentMatrix = (Matrix) startValues.values.get(PROPNAME_PARENT_MATRIX);
        startLocal.postConcat(startParentMatrix);
        startLocal.postConcat(toLocal);
    }

    @SuppressWarnings("WeakerAccess") /* synthetic access */
    static void setIdentityTransforms(View view) {
        setTransforms(view, 0, 0, 0, 1, 1, 0, 0, 0);
    }

    @SuppressWarnings("WeakerAccess") /* synthetic access */
    static void setTransforms(View view, float translationX, float translationY,
            float translationZ, float scaleX, float scaleY, float rotationX,
            float rotationY, float rotationZ) {
        view.setTranslationX(translationX);
        view.setTranslationY(translationY);
        ViewCompat.setTranslationZ(view, translationZ);
        view.setScaleX(scaleX);
        view.setScaleY(scaleY);
        view.setRotationX(rotationX);
        view.setRotationY(rotationY);
        view.setRotation(rotationZ);
    }

    private static class Transforms {

        final float mTranslationX;
        final float mTranslationY;
        final float mTranslationZ;
        final float mScaleX;
        final float mScaleY;
        final float mRotationX;
        final float mRotationY;
        final float mRotationZ;

        Transforms(View view) {
            mTranslationX = view.getTranslationX();
            mTranslationY = view.getTranslationY();
            mTranslationZ = ViewCompat.getTranslationZ(view);
            mScaleX = view.getScaleX();
            mScaleY = view.getScaleY();
            mRotationX = view.getRotationX();
            mRotationY = view.getRotationY();
            mRotationZ = view.getRotation();
        }

        public void restore(View view) {
            setTransforms(view, mTranslationX, mTranslationY, mTranslationZ, mScaleX, mScaleY,
                    mRotationX, mRotationY, mRotationZ);
        }

        @Override
        public boolean equals(Object that) {
            if (!(that instanceof Transforms)) {
                return false;
            }
            Transforms thatTransform = (Transforms) that;
            return thatTransform.mTranslationX == mTranslationX
                    && thatTransform.mTranslationY == mTranslationY
                    && thatTransform.mTranslationZ == mTranslationZ
                    && thatTransform.mScaleX == mScaleX
                    && thatTransform.mScaleY == mScaleY
                    && thatTransform.mRotationX == mRotationX
                    && thatTransform.mRotationY == mRotationY
                    && thatTransform.mRotationZ == mRotationZ;
        }

        @Override
        public int hashCode() {
            int code = mTranslationX != +0.0f ? Float.floatToIntBits(mTranslationX) : 0;
            code = 31 * code + (mTranslationY != +0.0f ? Float.floatToIntBits(mTranslationY) : 0);
            code = 31 * code + (mTranslationZ != +0.0f ? Float.floatToIntBits(mTranslationZ) : 0);
            code = 31 * code + (mScaleX != +0.0f ? Float.floatToIntBits(mScaleX) : 0);
            code = 31 * code + (mScaleY != +0.0f ? Float.floatToIntBits(mScaleY) : 0);
            code = 31 * code + (mRotationX != +0.0f ? Float.floatToIntBits(mRotationX) : 0);
            code = 31 * code + (mRotationY != +0.0f ? Float.floatToIntBits(mRotationY) : 0);
            code = 31 * code + (mRotationZ != +0.0f ? Float.floatToIntBits(mRotationZ) : 0);
            return code;
        }

    }

    private static class GhostListener extends TransitionListenerAdapter {

        private View mView;
        private GhostView mGhostView;

        GhostListener(View view, GhostView ghostView) {
            mView = view;
            mGhostView = ghostView;
        }

        @Override
        public void onTransitionEnd(@NonNull Transition transition) {
            transition.removeListener(this);
            GhostViewUtils.removeGhost(mView);
            mView.setTag(R.id.transition_transform, null);
            mView.setTag(R.id.parent_matrix, null);
        }

        @Override
        public void onTransitionPause(@NonNull Transition transition) {
            mGhostView.setVisibility(View.INVISIBLE);
        }

        @Override
        public void onTransitionResume(@NonNull Transition transition) {
            mGhostView.setVisibility(View.VISIBLE);
        }

    }

    /**
     * PathAnimatorMatrix allows the translations and the rest of the matrix to be set
     * separately. This allows the PathMotion to affect the translations while scale
     * and rotation are evaluated separately.
     */
    private static class PathAnimatorMatrix {

        private final Matrix mMatrix = new Matrix();
        private final View mView;
        private final float[] mValues;
        private float mTranslationX;
        private float mTranslationY;

        PathAnimatorMatrix(View view, float[] values) {
            mView = view;
            mValues = values.clone();
            mTranslationX = mValues[Matrix.MTRANS_X];
            mTranslationY = mValues[Matrix.MTRANS_Y];
            setAnimationMatrix();
        }

        void setValues(float[] values) {
            System.arraycopy(values, 0, mValues, 0, values.length);
            setAnimationMatrix();
        }

        void setTranslation(PointF translation) {
            mTranslationX = translation.x;
            mTranslationY = translation.y;
            setAnimationMatrix();
        }

        private void setAnimationMatrix() {
            mValues[Matrix.MTRANS_X] = mTranslationX;
            mValues[Matrix.MTRANS_Y] = mTranslationY;
            mMatrix.setValues(mValues);
            ViewUtils.setAnimationMatrix(mView, mMatrix);
        }

        Matrix getMatrix() {
            return mMatrix;
        }
    }

    private static class Listener extends AnimatorListenerAdapter {
        private boolean mIsCanceled;
        private final Matrix mTempMatrix = new Matrix();
        private final boolean mHandleParentChange;
        private final boolean mUseOverlay;
        private final View mView;
        private final Transforms mTransforms;
        private final PathAnimatorMatrix mPathAnimatorMatrix;
        private final Matrix mEndMatrix;

        Listener(View view, Transforms transforms, PathAnimatorMatrix pathAnimatorMatrix,
                Matrix endMatrix, boolean handleParentChange, boolean useOverlay) {
            mHandleParentChange = handleParentChange;
            mUseOverlay = useOverlay;
            mView = view;
            mTransforms = transforms;
            mPathAnimatorMatrix = pathAnimatorMatrix;
            mEndMatrix = endMatrix;
        }

        @Override
        public void onAnimationCancel(Animator animation) {
            mIsCanceled = true;
        }

        @Override
        public void onAnimationEnd(Animator animation) {
            if (!mIsCanceled) {
                if (mHandleParentChange && mUseOverlay) {
                    setCurrentMatrix(mEndMatrix);
                } else {
                    mView.setTag(R.id.transition_transform, null);
                    mView.setTag(R.id.parent_matrix, null);
                }
            }
            ViewUtils.setAnimationMatrix(mView, null);
            mTransforms.restore(mView);
        }

        @Override
        public void onAnimationPause(Animator animation) {
            Matrix currentMatrix = mPathAnimatorMatrix.getMatrix();
            setCurrentMatrix(currentMatrix);
        }

        @Override
        public void onAnimationResume(Animator animation) {
            setIdentityTransforms(mView);
        }

        private void setCurrentMatrix(Matrix currentMatrix) {
            mTempMatrix.set(currentMatrix);
            mView.setTag(R.id.transition_transform, mTempMatrix);
            mTransforms.restore(mView);
        }
    }
}

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ChangeTransform

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