EnterTransitionCoordinator.java revision bd93e69c8e0b06fc0b0bbba4bdd9e426b37f98e1
1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16package android.app; 17 18import android.animation.Animator; 19import android.animation.AnimatorListenerAdapter; 20import android.animation.ObjectAnimator; 21import android.app.SharedElementCallback.OnSharedElementsReadyListener; 22import android.graphics.drawable.Drawable; 23import android.os.Bundle; 24import android.os.ResultReceiver; 25import android.text.TextUtils; 26import android.transition.Transition; 27import android.transition.TransitionManager; 28import android.util.ArrayMap; 29import android.view.View; 30import android.view.ViewGroup; 31import android.view.ViewGroupOverlay; 32import android.view.ViewTreeObserver; 33import android.view.Window; 34 35import java.util.ArrayList; 36 37/** 38 * This ActivityTransitionCoordinator is created by the Activity to manage 39 * the enter scene and shared element transfer into the Scene, either during 40 * launch of an Activity or returning from a launched Activity. 41 */ 42class EnterTransitionCoordinator extends ActivityTransitionCoordinator { 43 private static final String TAG = "EnterTransitionCoordinator"; 44 45 private static final int MIN_ANIMATION_FRAMES = 2; 46 47 private boolean mSharedElementTransitionStarted; 48 private Activity mActivity; 49 private boolean mHasStopped; 50 private boolean mIsCanceled; 51 private ObjectAnimator mBackgroundAnimator; 52 private boolean mIsExitTransitionComplete; 53 private boolean mIsReadyForTransition; 54 private Bundle mSharedElementsBundle; 55 private boolean mWasOpaque; 56 private boolean mAreViewsReady; 57 private boolean mIsViewsTransitionStarted; 58 private boolean mIsViewsTransitionComplete; 59 private boolean mIsSharedElementTransitionComplete; 60 private Transition mEnterViewsTransition; 61 62 public EnterTransitionCoordinator(Activity activity, ResultReceiver resultReceiver, 63 ArrayList<String> sharedElementNames, boolean isReturning) { 64 super(activity.getWindow(), sharedElementNames, 65 getListener(activity, isReturning), isReturning); 66 mActivity = activity; 67 setResultReceiver(resultReceiver); 68 prepareEnter(); 69 Bundle resultReceiverBundle = new Bundle(); 70 resultReceiverBundle.putParcelable(KEY_REMOTE_RECEIVER, this); 71 mResultReceiver.send(MSG_SET_REMOTE_RECEIVER, resultReceiverBundle); 72 final View decorView = getDecor(); 73 if (decorView != null) { 74 decorView.getViewTreeObserver().addOnPreDrawListener( 75 new ViewTreeObserver.OnPreDrawListener() { 76 @Override 77 public boolean onPreDraw() { 78 if (mIsReadyForTransition) { 79 decorView.getViewTreeObserver().removeOnPreDrawListener(this); 80 } 81 return mIsReadyForTransition; 82 } 83 }); 84 } 85 } 86 87 public void viewInstancesReady(ArrayList<String> accepted, ArrayList<String> localNames, 88 ArrayList<View> localViews) { 89 boolean remap = false; 90 for (int i = 0; i < localViews.size(); i++) { 91 View view = localViews.get(i); 92 if (!TextUtils.equals(view.getTransitionName(), localNames.get(i)) 93 || !view.isAttachedToWindow()) { 94 remap = true; 95 break; 96 } 97 } 98 if (remap) { 99 triggerViewsReady(mapNamedElements(accepted, localNames)); 100 } else { 101 triggerViewsReady(mapSharedElements(accepted, localViews)); 102 } 103 } 104 105 public void namedViewsReady(ArrayList<String> accepted, ArrayList<String> localNames) { 106 triggerViewsReady(mapNamedElements(accepted, localNames)); 107 } 108 109 public Transition getEnterViewsTransition() { 110 return mEnterViewsTransition; 111 } 112 113 @Override 114 protected void viewsReady(ArrayMap<String, View> sharedElements) { 115 super.viewsReady(sharedElements); 116 mIsReadyForTransition = true; 117 hideViews(mSharedElements); 118 if (getViewsTransition() != null && mTransitioningViews != null) { 119 hideViews(mTransitioningViews); 120 } 121 if (mIsReturning) { 122 sendSharedElementDestination(); 123 } else { 124 moveSharedElementsToOverlay(); 125 } 126 if (mSharedElementsBundle != null) { 127 onTakeSharedElements(); 128 } 129 } 130 131 private void triggerViewsReady(final ArrayMap<String, View> sharedElements) { 132 if (mAreViewsReady) { 133 return; 134 } 135 mAreViewsReady = true; 136 final ViewGroup decor = getDecor(); 137 // Ensure the views have been laid out before capturing the views -- we need the epicenter. 138 if (decor == null || (decor.isAttachedToWindow() && 139 (sharedElements.isEmpty() || !sharedElements.valueAt(0).isLayoutRequested()))) { 140 viewsReady(sharedElements); 141 } else { 142 decor.getViewTreeObserver() 143 .addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { 144 @Override 145 public boolean onPreDraw() { 146 decor.getViewTreeObserver().removeOnPreDrawListener(this); 147 viewsReady(sharedElements); 148 return true; 149 } 150 }); 151 } 152 } 153 154 private ArrayMap<String, View> mapNamedElements(ArrayList<String> accepted, 155 ArrayList<String> localNames) { 156 ArrayMap<String, View> sharedElements = new ArrayMap<String, View>(); 157 ViewGroup decorView = getDecor(); 158 if (decorView != null) { 159 decorView.findNamedViews(sharedElements); 160 } 161 if (accepted != null) { 162 for (int i = 0; i < localNames.size(); i++) { 163 String localName = localNames.get(i); 164 String acceptedName = accepted.get(i); 165 if (localName != null && !localName.equals(acceptedName)) { 166 View view = sharedElements.remove(localName); 167 if (view != null) { 168 sharedElements.put(acceptedName, view); 169 } 170 } 171 } 172 } 173 return sharedElements; 174 } 175 176 private void sendSharedElementDestination() { 177 boolean allReady; 178 final View decorView = getDecor(); 179 if (allowOverlappingTransitions() && getEnterViewsTransition() != null) { 180 allReady = false; 181 } else if (decorView == null) { 182 allReady = true; 183 } else { 184 allReady = !decorView.isLayoutRequested(); 185 if (allReady) { 186 for (int i = 0; i < mSharedElements.size(); i++) { 187 if (mSharedElements.get(i).isLayoutRequested()) { 188 allReady = false; 189 break; 190 } 191 } 192 } 193 } 194 if (allReady) { 195 Bundle state = captureSharedElementState(); 196 moveSharedElementsToOverlay(); 197 mResultReceiver.send(MSG_SHARED_ELEMENT_DESTINATION, state); 198 } else if (decorView != null) { 199 decorView.getViewTreeObserver() 200 .addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { 201 @Override 202 public boolean onPreDraw() { 203 decorView.getViewTreeObserver().removeOnPreDrawListener(this); 204 if (mResultReceiver != null) { 205 Bundle state = captureSharedElementState(); 206 moveSharedElementsToOverlay(); 207 mResultReceiver.send(MSG_SHARED_ELEMENT_DESTINATION, state); 208 } 209 return true; 210 } 211 }); 212 } 213 if (allowOverlappingTransitions()) { 214 startEnterTransitionOnly(); 215 } 216 } 217 218 private static SharedElementCallback getListener(Activity activity, boolean isReturning) { 219 return isReturning ? activity.mExitTransitionListener : activity.mEnterTransitionListener; 220 } 221 222 @Override 223 protected void onReceiveResult(int resultCode, Bundle resultData) { 224 switch (resultCode) { 225 case MSG_TAKE_SHARED_ELEMENTS: 226 if (!mIsCanceled) { 227 mSharedElementsBundle = resultData; 228 onTakeSharedElements(); 229 } 230 break; 231 case MSG_EXIT_TRANSITION_COMPLETE: 232 if (!mIsCanceled) { 233 mIsExitTransitionComplete = true; 234 if (mSharedElementTransitionStarted) { 235 onRemoteExitTransitionComplete(); 236 } 237 } 238 break; 239 case MSG_CANCEL: 240 cancel(); 241 break; 242 } 243 } 244 245 private void cancel() { 246 if (!mIsCanceled) { 247 mIsCanceled = true; 248 if (getViewsTransition() == null || mIsViewsTransitionStarted) { 249 showViews(mSharedElements, true); 250 } else if (mTransitioningViews != null) { 251 mTransitioningViews.addAll(mSharedElements); 252 } 253 mSharedElementNames.clear(); 254 mSharedElements.clear(); 255 mAllSharedElementNames.clear(); 256 startSharedElementTransition(null); 257 onRemoteExitTransitionComplete(); 258 } 259 } 260 261 public boolean isReturning() { 262 return mIsReturning; 263 } 264 265 protected void prepareEnter() { 266 ViewGroup decorView = getDecor(); 267 if (mActivity == null || decorView == null) { 268 return; 269 } 270 mActivity.overridePendingTransition(0, 0); 271 if (!mIsReturning) { 272 mWasOpaque = mActivity.convertToTranslucent(null, null); 273 Drawable background = decorView.getBackground(); 274 if (background != null) { 275 getWindow().setBackgroundDrawable(null); 276 background = background.mutate(); 277 background.setAlpha(0); 278 getWindow().setBackgroundDrawable(background); 279 } 280 } else { 281 mActivity = null; // all done with it now. 282 } 283 } 284 285 @Override 286 protected Transition getViewsTransition() { 287 Window window = getWindow(); 288 if (window == null) { 289 return null; 290 } 291 if (mIsReturning) { 292 return window.getReenterTransition(); 293 } else { 294 return window.getEnterTransition(); 295 } 296 } 297 298 protected Transition getSharedElementTransition() { 299 Window window = getWindow(); 300 if (window == null) { 301 return null; 302 } 303 if (mIsReturning) { 304 return window.getSharedElementReenterTransition(); 305 } else { 306 return window.getSharedElementEnterTransition(); 307 } 308 } 309 310 private void startSharedElementTransition(Bundle sharedElementState) { 311 ViewGroup decorView = getDecor(); 312 if (decorView == null) { 313 return; 314 } 315 // Remove rejected shared elements 316 ArrayList<String> rejectedNames = new ArrayList<String>(mAllSharedElementNames); 317 rejectedNames.removeAll(mSharedElementNames); 318 ArrayList<View> rejectedSnapshots = createSnapshots(sharedElementState, rejectedNames); 319 if (mListener != null) { 320 mListener.onRejectSharedElements(rejectedSnapshots); 321 } 322 removeNullViews(rejectedSnapshots); 323 startRejectedAnimations(rejectedSnapshots); 324 325 // Now start shared element transition 326 ArrayList<View> sharedElementSnapshots = createSnapshots(sharedElementState, 327 mSharedElementNames); 328 showViews(mSharedElements, true); 329 scheduleSetSharedElementEnd(sharedElementSnapshots); 330 ArrayList<SharedElementOriginalState> originalImageViewState = 331 setSharedElementState(sharedElementState, sharedElementSnapshots); 332 requestLayoutForSharedElements(); 333 334 boolean startEnterTransition = allowOverlappingTransitions() && !mIsReturning; 335 boolean startSharedElementTransition = true; 336 setGhostVisibility(View.INVISIBLE); 337 scheduleGhostVisibilityChange(View.INVISIBLE); 338 Transition transition = beginTransition(decorView, startEnterTransition, 339 startSharedElementTransition); 340 scheduleGhostVisibilityChange(View.VISIBLE); 341 setGhostVisibility(View.VISIBLE); 342 343 if (startEnterTransition) { 344 startEnterTransition(transition); 345 } 346 347 setOriginalSharedElementState(mSharedElements, originalImageViewState); 348 349 if (mResultReceiver != null) { 350 // We can't trust that the view will disappear on the same frame that the shared 351 // element appears here. Assure that we get at least 2 frames for double-buffering. 352 decorView.postOnAnimation(new Runnable() { 353 int mAnimations; 354 355 @Override 356 public void run() { 357 if (mAnimations++ < MIN_ANIMATION_FRAMES) { 358 View decorView = getDecor(); 359 if (decorView != null) { 360 decorView.postOnAnimation(this); 361 } 362 } else if (mResultReceiver != null) { 363 mResultReceiver.send(MSG_HIDE_SHARED_ELEMENTS, null); 364 mResultReceiver = null; // all done sending messages. 365 } 366 } 367 }); 368 } 369 } 370 371 private static void removeNullViews(ArrayList<View> views) { 372 if (views != null) { 373 for (int i = views.size() - 1; i >= 0; i--) { 374 if (views.get(i) == null) { 375 views.remove(i); 376 } 377 } 378 } 379 } 380 381 private void onTakeSharedElements() { 382 if (!mIsReadyForTransition || mSharedElementsBundle == null) { 383 return; 384 } 385 final Bundle sharedElementState = mSharedElementsBundle; 386 mSharedElementsBundle = null; 387 OnSharedElementsReadyListener listener = new OnSharedElementsReadyListener() { 388 @Override 389 public void onSharedElementsReady() { 390 final View decorView = getDecor(); 391 if (decorView != null) { 392 decorView.getViewTreeObserver() 393 .addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { 394 @Override 395 public boolean onPreDraw() { 396 decorView.getViewTreeObserver().removeOnPreDrawListener(this); 397 startTransition(new Runnable() { 398 @Override 399 public void run() { 400 startSharedElementTransition(sharedElementState); 401 } 402 }); 403 return false; 404 } 405 }); 406 decorView.invalidate(); 407 } 408 } 409 }; 410 if (mListener == null) { 411 listener.onSharedElementsReady(); 412 } else { 413 mListener.onSharedElementsArrived(mSharedElementNames, mSharedElements, listener); 414 } 415 } 416 417 private void requestLayoutForSharedElements() { 418 int numSharedElements = mSharedElements.size(); 419 for (int i = 0; i < numSharedElements; i++) { 420 mSharedElements.get(i).requestLayout(); 421 } 422 } 423 424 private Transition beginTransition(ViewGroup decorView, boolean startEnterTransition, 425 boolean startSharedElementTransition) { 426 Transition sharedElementTransition = null; 427 if (startSharedElementTransition) { 428 if (!mSharedElementNames.isEmpty()) { 429 sharedElementTransition = configureTransition(getSharedElementTransition(), false); 430 } 431 if (sharedElementTransition == null) { 432 sharedElementTransitionStarted(); 433 sharedElementTransitionComplete(); 434 } else { 435 sharedElementTransition.addListener(new Transition.TransitionListenerAdapter() { 436 @Override 437 public void onTransitionStart(Transition transition) { 438 sharedElementTransitionStarted(); 439 } 440 441 @Override 442 public void onTransitionEnd(Transition transition) { 443 transition.removeListener(this); 444 sharedElementTransitionComplete(); 445 } 446 }); 447 } 448 } 449 Transition viewsTransition = null; 450 if (startEnterTransition) { 451 mIsViewsTransitionStarted = true; 452 if (mTransitioningViews != null && !mTransitioningViews.isEmpty()) { 453 viewsTransition = configureTransition(getViewsTransition(), true); 454 if (viewsTransition != null && !mIsReturning) { 455 stripOffscreenViews(); 456 } 457 } 458 if (viewsTransition == null) { 459 viewTransitionComplete(); 460 } else { 461 viewsTransition.forceVisibility(View.INVISIBLE, true); 462 final ArrayList<View> transitioningViews = mTransitioningViews; 463 viewsTransition.addListener(new ContinueTransitionListener() { 464 @Override 465 public void onTransitionStart(Transition transition) { 466 mEnterViewsTransition = transition; 467 if (transitioningViews != null) { 468 showViews(transitioningViews, false); 469 } 470 super.onTransitionStart(transition); 471 } 472 473 @Override 474 public void onTransitionEnd(Transition transition) { 475 mEnterViewsTransition = null; 476 transition.removeListener(this); 477 viewTransitionComplete(); 478 super.onTransitionEnd(transition); 479 } 480 }); 481 } 482 } 483 484 Transition transition = mergeTransitions(sharedElementTransition, viewsTransition); 485 if (transition != null) { 486 transition.addListener(new ContinueTransitionListener()); 487 TransitionManager.beginDelayedTransition(decorView, transition); 488 if (startSharedElementTransition && !mSharedElementNames.isEmpty()) { 489 mSharedElements.get(0).invalidate(); 490 } else if (startEnterTransition && mTransitioningViews != null && 491 !mTransitioningViews.isEmpty()) { 492 mTransitioningViews.get(0).invalidate(); 493 } 494 } else { 495 transitionStarted(); 496 } 497 return transition; 498 } 499 500 private void viewTransitionComplete() { 501 mIsViewsTransitionComplete = true; 502 if (mIsSharedElementTransitionComplete) { 503 moveSharedElementsFromOverlay(); 504 } 505 } 506 507 private void sharedElementTransitionComplete() { 508 mIsSharedElementTransitionComplete = true; 509 if (mIsViewsTransitionComplete) { 510 moveSharedElementsFromOverlay(); 511 } 512 } 513 514 private void sharedElementTransitionStarted() { 515 mSharedElementTransitionStarted = true; 516 if (mIsExitTransitionComplete) { 517 send(MSG_EXIT_TRANSITION_COMPLETE, null); 518 } 519 } 520 521 private void startEnterTransition(Transition transition) { 522 ViewGroup decorView = getDecor(); 523 if (!mIsReturning && decorView != null) { 524 Drawable background = decorView.getBackground(); 525 if (background != null) { 526 background = background.mutate(); 527 getWindow().setBackgroundDrawable(background); 528 mBackgroundAnimator = ObjectAnimator.ofInt(background, "alpha", 255); 529 mBackgroundAnimator.setDuration(getFadeDuration()); 530 mBackgroundAnimator.addListener(new AnimatorListenerAdapter() { 531 @Override 532 public void onAnimationEnd(Animator animation) { 533 makeOpaque(); 534 } 535 }); 536 mBackgroundAnimator.start(); 537 } else if (transition != null) { 538 transition.addListener(new Transition.TransitionListenerAdapter() { 539 @Override 540 public void onTransitionEnd(Transition transition) { 541 transition.removeListener(this); 542 makeOpaque(); 543 } 544 }); 545 } else { 546 makeOpaque(); 547 } 548 } 549 } 550 551 public void stop() { 552 // Restore the background to its previous state since the 553 // Activity is stopping. 554 if (mBackgroundAnimator != null) { 555 mBackgroundAnimator.end(); 556 mBackgroundAnimator = null; 557 } else if (mWasOpaque) { 558 ViewGroup decorView = getDecor(); 559 if (decorView != null) { 560 Drawable drawable = decorView.getBackground(); 561 if (drawable != null) { 562 drawable.setAlpha(1); 563 } 564 } 565 } 566 makeOpaque(); 567 mIsCanceled = true; 568 mResultReceiver = null; 569 mActivity = null; 570 moveSharedElementsFromOverlay(); 571 if (mTransitioningViews != null) { 572 showViews(mTransitioningViews, true); 573 } 574 showViews(mSharedElements, true); 575 clearState(); 576 } 577 578 /** 579 * Cancels the enter transition. 580 * @return True if the enter transition is still pending capturing the target state. If so, 581 * any transition started on the decor will do nothing. 582 */ 583 public boolean cancelEnter() { 584 setGhostVisibility(View.INVISIBLE); 585 mHasStopped = true; 586 mIsCanceled = true; 587 mResultReceiver = null; 588 if (mBackgroundAnimator != null) { 589 mBackgroundAnimator.cancel(); 590 mBackgroundAnimator = null; 591 } 592 mActivity = null; 593 clearState(); 594 return super.cancelPendingTransitions(); 595 } 596 597 private void makeOpaque() { 598 if (!mHasStopped && mActivity != null) { 599 if (mWasOpaque) { 600 mActivity.convertFromTranslucent(); 601 } 602 mActivity = null; 603 } 604 } 605 606 private boolean allowOverlappingTransitions() { 607 return mIsReturning ? getWindow().getAllowExitTransitionOverlap() 608 : getWindow().getAllowEnterTransitionOverlap(); 609 } 610 611 private void startRejectedAnimations(final ArrayList<View> rejectedSnapshots) { 612 if (rejectedSnapshots == null || rejectedSnapshots.isEmpty()) { 613 return; 614 } 615 final ViewGroup decorView = getDecor(); 616 if (decorView != null) { 617 ViewGroupOverlay overlay = decorView.getOverlay(); 618 ObjectAnimator animator = null; 619 int numRejected = rejectedSnapshots.size(); 620 for (int i = 0; i < numRejected; i++) { 621 View snapshot = rejectedSnapshots.get(i); 622 overlay.add(snapshot); 623 animator = ObjectAnimator.ofFloat(snapshot, View.ALPHA, 1, 0); 624 animator.start(); 625 } 626 animator.addListener(new AnimatorListenerAdapter() { 627 @Override 628 public void onAnimationEnd(Animator animation) { 629 ViewGroupOverlay overlay = decorView.getOverlay(); 630 int numRejected = rejectedSnapshots.size(); 631 for (int i = 0; i < numRejected; i++) { 632 overlay.remove(rejectedSnapshots.get(i)); 633 } 634 } 635 }); 636 } 637 } 638 639 protected void onRemoteExitTransitionComplete() { 640 if (!allowOverlappingTransitions()) { 641 startEnterTransitionOnly(); 642 } 643 } 644 645 private void startEnterTransitionOnly() { 646 startTransition(new Runnable() { 647 @Override 648 public void run() { 649 boolean startEnterTransition = true; 650 boolean startSharedElementTransition = false; 651 ViewGroup decorView = getDecor(); 652 if (decorView != null) { 653 Transition transition = beginTransition(decorView, startEnterTransition, 654 startSharedElementTransition); 655 startEnterTransition(transition); 656 } 657 } 658 }); 659 } 660 661} 662