Java tutorial
/* * Copyright (C) 2017 Florian Dreier * * This file is part of MyTargets. * * MyTargets is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * MyTargets is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ package de.dreier.mytargets.utils.transitions; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.AnimatorSet; import android.animation.ObjectAnimator; import android.annotation.TargetApi; import android.app.Activity; import android.content.Intent; import android.graphics.Outline; import android.graphics.Rect; import android.graphics.drawable.ColorDrawable; import android.graphics.drawable.Drawable; import android.support.annotation.ColorInt; import android.support.annotation.ColorRes; import android.support.annotation.DrawableRes; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.content.ContextCompat; import android.support.v4.view.animation.FastOutLinearInInterpolator; import android.support.v4.view.animation.FastOutSlowInInterpolator; import android.support.v4.view.animation.LinearOutSlowInInterpolator; import android.transition.Transition; import android.transition.TransitionValues; import android.view.View; import android.view.ViewAnimationUtils; import android.view.ViewGroup; import android.view.ViewOutlineProvider; import android.view.animation.Interpolator; import java.util.ArrayList; import java.util.List; import de.dreier.mytargets.R; import static android.os.Build.VERSION_CODES.LOLLIPOP; import static android.view.View.MeasureSpec.makeMeasureSpec; /** * A transition between a FAB & another surface using a circular reveal moving along an arc. * <p> * See: https://www.google.com/design/spec/motion/transforming-material.html#transforming-material-radial-transformation */ @TargetApi(LOLLIPOP) public class FabTransform extends Transition { private static final String EXTRA_FAB_COLOR_RES = "EXTRA_FAB_COLOR"; private static final String EXTRA_FAB_ICON_RES_ID = "EXTRA_FAB_ICON_RES_ID"; private static final long DEFAULT_DURATION = 240L; private static final String PROP_BOUNDS = "plaid:fabTransform:bounds"; private static final String[] TRANSITION_PROPERTIES = { PROP_BOUNDS }; @ColorInt private final int color; private final int icon; private FabTransform(@ColorInt int fabColor, @DrawableRes int fabIconResId) { color = fabColor; icon = fabIconResId; setPathMotion(new GravityArcMotion()); setDuration(DEFAULT_DURATION); } /** * Configure {@code intent} with the extras needed to initialize this transition. */ public static void addExtras(@NonNull Intent intent, @ColorRes int fabColor, @DrawableRes int fabIconResId) { intent.putExtra(EXTRA_FAB_COLOR_RES, fabColor); intent.putExtra(EXTRA_FAB_ICON_RES_ID, fabIconResId); } /** * Create a {@link FabTransform} from the supplied {@code activity} extras and set as its * shared element enter/return transition. */ static boolean setup(@NonNull Activity activity, @Nullable View target) { final Intent intent = activity.getIntent(); if (!intent.hasExtra(EXTRA_FAB_COLOR_RES) || !intent.hasExtra(EXTRA_FAB_ICON_RES_ID)) { return false; } final int colorRes = intent.getIntExtra(EXTRA_FAB_COLOR_RES, R.color.colorAccent); final int icon = intent.getIntExtra(EXTRA_FAB_ICON_RES_ID, -1); final int color = ContextCompat.getColor(activity, colorRes); final FabTransform sharedEnter = new FabTransform(color, icon); if (target != null) { sharedEnter.addTarget(target); } activity.getWindow().setSharedElementEnterTransition(sharedEnter); return true; } @Override public String[] getTransitionProperties() { return TRANSITION_PROPERTIES; } @Override public void captureStartValues(@NonNull TransitionValues transitionValues) { captureValues(transitionValues); } @Override public void captureEndValues(@NonNull TransitionValues transitionValues) { captureValues(transitionValues); } @Override public Animator createAnimator(@NonNull final ViewGroup sceneRoot, final TransitionValues startValues, final TransitionValues endValues) { if (startValues == null || endValues == null) { return null; } final Rect startBounds = (Rect) startValues.values.get(PROP_BOUNDS); final Rect endBounds = (Rect) endValues.values.get(PROP_BOUNDS); final boolean fromFab = endBounds.width() > startBounds.width(); final View view = endValues.view; final Rect dialogBounds = fromFab ? endBounds : startBounds; final Rect fabBounds = fromFab ? startBounds : endBounds; final Interpolator fastOutSlowInInterpolator = new FastOutSlowInInterpolator(); final long duration = getDuration(); final long halfDuration = duration / 2; final long twoThirdsDuration = duration * 2 / 3; if (!fromFab) { // Force measure / layout the dialog back to it's original bounds view.measure(makeMeasureSpec(startBounds.width(), View.MeasureSpec.EXACTLY), makeMeasureSpec(startBounds.height(), View.MeasureSpec.EXACTLY)); view.layout(startBounds.left, startBounds.top, startBounds.right, startBounds.bottom); } final int translationX = startBounds.centerX() - endBounds.centerX(); final int translationY = startBounds.centerY() - endBounds.centerY(); if (fromFab) { view.setTranslationX(translationX); view.setTranslationY(translationY); } // Add a color overlay to fake appearance of the FAB final ColorDrawable fabColor = new ColorDrawable(color); fabColor.setBounds(0, 0, dialogBounds.width(), dialogBounds.height()); if (!fromFab) { fabColor.setAlpha(0); } view.getOverlay().add(fabColor); // Add an icon overlay again to fake the appearance of the FAB final Drawable fabIcon = ContextCompat.getDrawable(sceneRoot.getContext(), icon).mutate(); final int iconLeft = (dialogBounds.width() - fabIcon.getIntrinsicWidth()) / 2; final int iconTop = (dialogBounds.height() - fabIcon.getIntrinsicHeight()) / 2; fabIcon.setBounds(iconLeft, iconTop, iconLeft + fabIcon.getIntrinsicWidth(), iconTop + fabIcon.getIntrinsicHeight()); if (!fromFab) { fabIcon.setAlpha(0); } view.getOverlay().add(fabIcon); // Circular clip from/to the FAB size final Animator circularReveal; if (fromFab) { circularReveal = ViewAnimationUtils.createCircularReveal(view, view.getWidth() / 2, view.getHeight() / 2, startBounds.width() / 2, (float) Math.hypot(endBounds.width() / 2, endBounds.height() / 2)); circularReveal.setInterpolator(new FastOutLinearInInterpolator()); } else { circularReveal = ViewAnimationUtils.createCircularReveal(view, view.getWidth() / 2, view.getHeight() / 2, (float) Math.hypot(startBounds.width() / 2, startBounds.height() / 2), endBounds.width() / 2); circularReveal.setInterpolator(new LinearOutSlowInInterpolator()); // Persist the end clip i.e. stay at FAB size after the reveal has run circularReveal.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { view.setOutlineProvider(new ViewOutlineProvider() { @Override public void getOutline(View view, Outline outline) { final int left = (view.getWidth() - fabBounds.width()) / 2; final int top = (view.getHeight() - fabBounds.height()) / 2; outline.setOval(left, top, left + fabBounds.width(), top + fabBounds.height()); view.setClipToOutline(true); } }); } }); } circularReveal.setDuration(duration); // Translate to end position along an arc final Animator translate = ObjectAnimator.ofFloat(view, View.TRANSLATION_X, View.TRANSLATION_Y, fromFab ? getPathMotion().getPath(translationX, translationY, 0, 0) : getPathMotion().getPath(0, 0, -translationX, -translationY)); translate.setDuration(duration); translate.setInterpolator(fastOutSlowInInterpolator); // Fade contents of non-FAB view in/out List<Animator> fadeContents = null; if (view instanceof ViewGroup) { final ViewGroup vg = ((ViewGroup) view); fadeContents = new ArrayList<>(vg.getChildCount()); for (int i = vg.getChildCount() - 1; i >= 0; i--) { final View child = vg.getChildAt(i); final Animator fade = ObjectAnimator.ofFloat(child, View.ALPHA, fromFab ? 1f : 0f); if (fromFab) { child.setAlpha(0f); } fade.setDuration(twoThirdsDuration); fade.setInterpolator(fastOutSlowInInterpolator); fadeContents.add(fade); } } // Fade in/out the fab color & icon overlays final Animator colorFade = ObjectAnimator.ofInt(fabColor, "alpha", fromFab ? 0 : 255); final Animator iconFade = ObjectAnimator.ofInt(fabIcon, "alpha", fromFab ? 0 : 255); if (!fromFab) { colorFade.setStartDelay(halfDuration); iconFade.setStartDelay(halfDuration); } colorFade.setDuration(halfDuration); iconFade.setDuration(halfDuration); colorFade.setInterpolator(fastOutSlowInInterpolator); iconFade.setInterpolator(fastOutSlowInInterpolator); // Work around issue with elevation shadows. At the end of the return transition the shared // element's shadow is drawn twice (by each activity) which is jarring. This workaround // still causes the shadow to snap, but it's better than seeing it double drawn. Animator elevation = null; if (!fromFab) { elevation = ObjectAnimator.ofFloat(view, View.TRANSLATION_Z, -view.getElevation()); elevation.setDuration(duration); elevation.setInterpolator(fastOutSlowInInterpolator); } // Run all animations together final AnimatorSet transition = new AnimatorSet(); transition.playTogether(circularReveal, translate, colorFade, iconFade); transition.playTogether(fadeContents); if (elevation != null) { transition.play(elevation); } if (fromFab) { transition.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { // Clean up view.getOverlay().clear(); } }); } return new NoPauseAnimator(transition); } private void captureValues(TransitionValues transitionValues) { final View view = transitionValues.view; if (view == null || view.getWidth() <= 0 || view.getHeight() <= 0) { return; } transitionValues.values.put(PROP_BOUNDS, new Rect(view.getLeft(), view.getTop(), view.getRight(), view.getBottom())); } }