Android 14 transtion 动画流程

1.接口

shell入口通过TransitionPlayerImpl与wm core 通信

2.    @BinderThread
3.     private class TransitionPlayerImpl extends ITransitionPlayer.Stub {
4.         @Override
5.         public void onTransitionReady(IBinder iBinder, TransitionInfo transitionInfo,
6.                 SurfaceControl.Transaction t, SurfaceControl.Transaction finishT)
7.                 throws RemoteException {
8.             mMainExecutor.execute(() -> Transitions.this.onTransitionReady(
9.                     iBinder, transitionInfo, t, finishT));
10.         }
12.         @Override
13.         public void requestStartTransition(IBinder iBinder,
14.                 TransitionRequestInfo request) throws RemoteException {
15.             mMainExecutor.execute(() -> Transitions.this.requestStartTransition(iBinder, request));
16.         }
17.     }
18. }

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1. 分为
3. 1. requestStartTransition
5. 2.onTransitionReady
7. 两个阶段
11. 1.requestStartTransition
12. wm services
14. new 一个动画放进mActiveSyncs中
18. 04-23 18:43:25.195 2077 4588 D jinyanmeiainima: BLASTSyncEngine startSyncSet s.mSyncId:6
19. 04-23 18:43:25.195 2077 4588 D jinyanmeiainima: BLASTSyncEngine startSyncSet s:com.android.server.wm.BLASTSyncEngine$SyncGroup@3ee8531
20. 04-23 18:43:25.195 2077 4588 D jinyanmeiainima: BLASTSyncEngine startSyncSet mActiveSyncs++++:0
21. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: BLASTSyncEngine startSyncSet mActiveSyncs---:1
22. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: java.lang.RuntimeException: jinyanmeiainima
23. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.BLASTSyncEngine.startSyncSet(BLASTSyncEngine.java:327)
24. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.BLASTSyncEngine.startSyncSet(BLASTSyncEngine.java:305)
25. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.Transition.startCollecting(Transition.java:422)
26. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.TransitionController.moveToCollecting(TransitionController.java:222)
27. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.TransitionController.moveToCollecting(TransitionController.java:203)
28. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.TransitionController.createTransition(TransitionController.java:197)
29. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.TransitionController.createTransition(TransitionController.java:179)
30. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskSupervisor.findTaskToMoveToFront(ActivityTaskSupervisor.java:1577)
31. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskManagerService.moveTaskToFrontLocked(ActivityTaskManagerService.java:2497)
32. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskSupervisor.startActivityFromRecents(ActivityTaskSupervisor.java:3034)
33. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskManagerService.startActivityFromRecents(ActivityTaskManagerService.java:1918)
34. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at android.app.IActivityTaskManager$Stub.onTransact(IActivityTaskManager.java:1434)
35. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskManagerService.onTransact(ActivityTaskManagerService.java:5840)
36. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at android.os.Binder.execTransactInternal(Binder.java:1348)
37. 04-23 18:43:25.196 2077 4588 D jinyanmeiainima: at android.os.Binder.execTransact(Binder.java:1279)
39. new出来后调用task.mTransitionController.collect(task);
41. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: ChangeInfo 111111111 this:Task{fa5361 #69 type=standard A=10143:comgallery.home}
42. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: ChangeInfo 111111111 mVisible:true
43. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: ChangeInfo 111111111 mWindowingMode:5
44. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: java.lang.RuntimeException: jinyanmeiani
45. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at com.android.server.wm.Transition$ChangeInfo.<init>(Transition.java:2258)
46. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at com.android.server.wm.Transition.collect(Transition.java:492)
47. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at com.android.server.wm.TransitionController.collect(TransitionController.java:568)
48. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at com.android.server.wm.ActivityTaskSupervisor.findTaskToMoveToFront(ActivityTaskSupervisor.java:1529)
49. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at com.android.server.wm.ActivityTaskManagerService.moveTaskToFrontLocked(ActivityTaskManagerService.java:2464)
50. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at com.android.server.wm.ActivityTaskSupervisor.startActivityFromRecents(ActivityTaskSupervisor.java:2901)
51. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at com.android.server.wm.ActivityTaskManagerService.startActivityFromRecents(ActivityTaskManagerService.java:1931)
52. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at android.app.IActivityTaskManager$Stub.onTransact(IActivityTaskManager.java:1430)
53. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at com.android.server.wm.ActivityTaskManagerService.onTransact(ActivityTaskManagerService.java:5786)
54. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at android.os.Binder.execTransactInternal(Binder.java:1348)
55. 04-24 16:06:47.682 1815 2160 D jinyanmeiani: at android.os.Binder.execTransact(Binder.java:1279)

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1. /** @see Transition#collect */
2. void collect(@NonNull WindowContainer wc) {
3.     if (mCollectingTransition == null) return;
4.     mCollectingTransition.collect(wc);
5. }

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计算所有的到mChanges
根据WindowContainer new 一个ChangeInfo

1. ChangeInfo(@NonNull WindowContainer origState) {
2.     mContainer = origState;
3.     mVisible = origState.isVisibleRequested();
4.     mWindowingMode = origState.getWindowingMode();
5.     mAbsoluteBounds.set(origState.getBounds());
6.     mShowWallpaper = origState.showWallpaper();
7.     mRotation = origState.getWindowConfiguration().getRotation();
8.     mStartParent = origState.getParent();
9. }

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把changeinfo放入mChanges
mChanges是一个map
key：WindowContainer
value：由key：WindowContainer构成的ChangeInfo
此列表在开始做动画时间会判断里面的key，value是否满足做动画的条件

1. void collect(@NonNull WindowContainer wc) {
2.       if (mState < STATE_COLLECTING) {
3.           throw new IllegalStateException("Transition hasn't started collecting.");
4.       }
5.       if (!isCollecting()) {
6.           // Too late, transition already started playing, so don't collect.
7.           return;
8.       }
9.       ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS, "Collecting in transition %d: %s",
10.               mSyncId, wc);
11.       // "snapshot" all parents (as potential promotion targets). Do this before checking
12.       // if this is already a participant in case it has since been re-parented.
13.       for (WindowContainer<?> curr = getAnimatableParent(wc);
14.               curr != null && !mChanges.containsKey(curr);
15.               curr = getAnimatableParent(curr)) {
16.           mChanges.put(curr, new ChangeInfo(curr)); // 放入队列中
17.           if (isReadyGroup(curr)) {
18.               mReadyTracker.addGroup(curr);
19.               ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS, " Creating Ready-group for"
20.                               + " Transition %d with root=%s", mSyncId, curr);
21.           }
22.       }
23.       if (mParticipants.contains(wc)) return;
24.       // Wallpaper is like in a static drawn state unless display may have changes, so exclude
25.       // the case to reduce transition latency waiting for the unchanged wallpaper to redraw.
26.       final boolean needSyncDraw = !isWallpaper(wc) || mParticipants.contains(wc.mDisplayContent);
27.       if (needSyncDraw) {
28.           mSyncEngine.addToSyncSet(mSyncId, wc);
29.       }
30.       ChangeInfo info = mChanges.get(wc);
31.       if (info == null) {
32.           info = new ChangeInfo(wc);
33.           Slog.d("jinyanmeiainima","collect                  wc:" + wc );
34.           Slog.d("jinyanmeiainima","collect             info:" + info );
36.           Slog.d("jinyanmeiainima","collect mChanges.size()+++:" + mChanges.size() );
37.           mChanges.put(wc, info);
38.           Slog.d("jinyanmeiainima","collect mChanges.size()---:" + mChanges.size() );
40.       }
41.       mParticipants.add(wc);
42.       if (wc.getDisplayContent() != null && !mTargetDisplays.contains(wc.getDisplayContent())) {
43.           mTargetDisplays.add(wc.getDisplayContent());
44.       }
45.       if (info.mShowWallpaper) {
46.           // Collect the wallpaper token (for isWallpaper(wc)) so it is part of the sync set.
47.           final WindowState wallpaper =
48.                   wc.getDisplayContent().mWallpaperController.getTopVisibleWallpaper();
49.           if (wallpaper != null) {
50.               collect(wallpaper.mToken);
51.           }
52.       }
53.   }

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1. 把new出来的动画申请开始动画requestStartTransition
3. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: requestStartTransition displayChange:
4. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: java.lang.RuntimeException: jinyanmeiainima
5. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: at com.android.server.wm.TransitionController.requestStartTransition(TransitionController.java:548)
6. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskSupervisor.findTaskToMoveToFront(ActivityTaskSupervisor.java:1622)
7. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskManagerService.moveTaskToFrontLocked(ActivityTaskManagerService.java:2497)
8. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskSupervisor.startActivityFromRecents(ActivityTaskSupervisor.java:3034)
9. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskManagerService.startActivityFromRecents(ActivityTaskManagerService.java:1918)
10. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: at android.app.IActivityTaskManager$Stub.onTransact(IActivityTaskManager.java:1434)
11. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: at com.android.server.wm.ActivityTaskManagerService.onTransact(ActivityTaskManagerService.java:5840)
12. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: at android.os.Binder.execTransactInternal(Binder.java:1348)
13. 04-23 18:43:25.211 2077 4588 D jinyanmeiainima: at android.os.Binder.execTransact(Binder.java:1279)

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1. Transition requestStartTransition(@NonNull Transition transition, @Nullable Task startTask,
2.         @Nullable RemoteTransition remoteTransition,
3.         @Nullable TransitionRequestInfo.DisplayChange displayChange) {
4.     Slog.d("jinyanmeiainima","requestStartTransition transition:" + transition );
5.     Slog.d("jinyanmeiainima","requestStartTransition startTask:" + startTask );
6.     Slog.d("jinyanmeiainima","requestStartTransition remoteTransition:" + remoteTransition );
7.     Slog.d("jinyanmeiainima","requestStartTransition displayChange:" + displayChange );
9.     if (mIsWaitingForDisplayEnabled) {
10.         ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS, "Disabling player for transition"
11.                 + " #%d because display isn't enabled yet", transition.getSyncId());
12.         transition.mIsPlayerEnabled = false;
13.         transition.mLogger.mRequestTimeNs = SystemClock.uptimeNanos();
14.         mAtm.mH.post(() -> mAtm.mWindowOrganizerController.startTransition(
15.                 transition.getToken(), null));
16.         return transition;
17.     }
18.     if (mTransitionPlayer == null || transition.isAborted()) {
19.         // Apparently, some tests will kill(and restart) systemui, so there is a chance that
20.         // the player might be transiently null.
21.         if (transition.isCollecting()) {
22.             transition.abort();
23.         }
24.         return transition;
25.     }
26.     try {
27.         ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS,
28.                 "Requesting StartTransition: %s", transition);
29.         ActivityManager.RunningTaskInfo info = null;
30.         if (startTask != null) {
31.             info = new ActivityManager.RunningTaskInfo();
32.             startTask.fillTaskInfo(info);
33.         }
34.         final TransitionRequestInfo request = new TransitionRequestInfo(
35.                 transition.mType, info, remoteTransition, displayChange);
36.         transition.mLogger.mRequestTimeNs = SystemClock.elapsedRealtimeNanos();
37.         transition.mLogger.mRequest = request;
38.         Slog.d("jinyanmeiainima","requestStartTransition transition.getToken():" + transition.getToken() );
39.         Slog.d("jinyanmeiainima","requestStartTransition               request:" + request);
41.         Slog.d("jinyanmeiainima","requestStartTransition displayChange:" ,  new RuntimeException("jinyanmeiainima") );
42.         mTransitionPlayer.requestStartTransition(transition.getToken(), request);
43.         transition.setRemoteTransition(remoteTransition);
44.     } catch (RemoteException e) {
45.         Slog.e(TAG, "Error requesting transition", e);
46.         transition.start();
47.     }
48.     return transition;
49. }

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转到shell：
Transition requestStartTransition(@NonNull Transition transition, @Nullable Task startTask,

1. requestStartTransition
2.             mTransitionPlayer.requestStartTransition(transition.getToken(), request);
3.             transition.setRemoteTransition(remoteTransition);

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shell

2.    @BinderThread
3.     private class TransitionPlayerImpl extends ITransitionPlayer.Stub {
4.         @Override
5.         public void onTransitionReady(IBinder iBinder, TransitionInfo transitionInfo,
6.                 SurfaceControl.Transaction t, SurfaceControl.Transaction finishT)
7.                 throws RemoteException {
8.             mMainExecutor.execute(() -> Transitions.this.onTransitionReady(
9.                     iBinder, transitionInfo, t, finishT));
10.         }
12.         @Override
13.         public void requestStartTransition(IBinder iBinder,
14.                 TransitionRequestInfo request) throws RemoteException {
15.             mMainExecutor.execute(() -> Transitions.this.requestStartTransition(iBinder, request));
16.         }
17.     }
18. }

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1. void requestStartTransition(@NonNull IBinder transitionToken,
2.         @Nullable TransitionRequestInfo request) {
3.     ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TRANSITIONS, "Transition requested: %s %s",
4.             transitionToken, request);
5.     if (isTransitionKnown(transitionToken)) {
6.         throw new RuntimeException("Transition already started " + transitionToken);
7.     }
8.     final ActiveTransition active = new ActiveTransition();
9.     WindowContainerTransaction wct = null;
11.     // If we have sleep, we use a special handler and we try to finish everything ASAP.
12.     if (request.getType() == TRANSIT_SLEEP) {
13.         mSleepHandler.handleRequest(transitionToken, request);
14.         active.mHandler = mSleepHandler;
15.     } else {
16.         for (int i = mHandlers.size() - 1; i >= 0; --i) {
17.             wct = mHandlers.get(i).handleRequest(transitionToken, request);
18.             if (wct != null) {
19.                 active.mHandler = mHandlers.get(i);
20.                 break;
21.             }
22.         }
23.         if (request.getDisplayChange() != null) {
24.             TransitionRequestInfo.DisplayChange change = request.getDisplayChange();
25.             if (change.getEndRotation() != change.getStartRotation()) {
26.                 // Is a rotation, so dispatch to all displayChange listeners
27.                 if (wct == null) {
28.                     wct = new WindowContainerTransaction();
29.                 }
30.                 mDisplayController.getChangeController().dispatchOnDisplayChange(wct,
31.                         change.getDisplayId(), change.getStartRotation(),
32.                         change.getEndRotation(), null /* newDisplayAreaInfo */);
33.             }
34.         }
35.     }
36.     mOrganizer.startTransition(transitionToken, wct != null && wct.isEmpty() ? null : wct);
37.     active.mToken = transitionToken;
38.     // Currently, WMCore only does one transition at a time. If it makes a requestStart, it
39.     // is already collecting that transition on core-side, so it will be the next one to
40.     // become ready. There may already be pending transitions added as part of direct
41.     // `startNewTransition` but if we have a request now, it means WM created the request
42.     // transition before it acknowledged any of the pending `startNew` transitions. So, insert
43.     // it at the front.
44.     mPendingTransitions.add(0, active);  // 添加到mPendingTransitions
45. }

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1. private static final class ActiveTransition {
2.     IBinder mToken;
3.     TransitionHandler mHandler;
4.     boolean mAborted;
5.     TransitionInfo mInfo;
6.     SurfaceControl.Transaction mStartT;
7.     SurfaceControl.Transaction mFinishT;
9.     /** Ordered list of transitions which have been merged into this one. */
10.     private ArrayList<ActiveTransition> mMerged;
11. }

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1. 转到wm core
3. 04-23 18:43:22.342 2980 3221 D jinyanmeiainima: WindowOrganizer transitionToken transitionToken:android.os.BinderProxy@3268f3
4. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: WindowOrganizer startTransition t:null
5. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: java.lang.RuntimeException: jinyanmeiainima
6. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at android.window.WindowOrganizer.startTransition(WindowOrganizer.java:112)
7. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions.requestStartTransition(Transitions.java:891)
8. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions$TransitionPlayerImpl.lambda$requestStartTransition$1(Transitions.java:1129)
9. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions$TransitionPlayerImpl.$r8$lambda$FkH1M0vUh3zDx8R5iMruInPEXLI(Unknown Source:0)
10. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions$TransitionPlayerImpl$$ExternalSyntheticLambda1.run(Unknown Source:6)
11. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at android.os.Handler.handleCallback(Handler.java:958)
12. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at android.os.Handler.dispatchMessage(Handler.java:99)
13. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at android.os.Looper.loopOnce(Looper.java:216)
14. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at android.os.Looper.loop(Looper.java:305)
15. 04-23 18:43:22.343 2980 3221 D jinyanmeiainima: at android.os.HandlerThread.run(HandlerThread.java:67)

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1. WindowOrganizer.java
2. @RequiresPermission(android.Manifest.permission.MANAGE_ACTIVITY_TASKS)
3.    public void startTransition(@NonNull IBinder transitionToken,
4.            @Nullable WindowContainerTransaction t) {
5.        try {
6.            getWindowOrganizerController().startTransition(transitionToken, t);
7.        } catch (RemoteException e) {
8.            throw e.rethrowFromSystemServer();
9.        }
10.    }

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1. 转到 wm services
2. WindowOrganizerController

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1. WindowOrganizerController.java   
2. private IBinder startTransition(@WindowManager.TransitionType int type,
3.             @Nullable IBinder transitionToken, @Nullable WindowContainerTransaction t) {
4.         enforceTaskPermission("startTransition()");
5.         final CallerInfo caller = new CallerInfo();
6.         final long ident = Binder.clearCallingIdentity();
7.         try {
8.             synchronized (mGlobalLock) {
9.                 Transition transition = Transition.fromBinder(transitionToken);
10.                 if (mTransitionController.getTransitionPlayer() == null && transition == null) {
11.                     Slog.w(TAG, "Using shell transitions API for legacy transitions.");
12.                     if (t == null) {
13.                         throw new IllegalArgumentException("Can't use legacy transitions in"
14.                                 + " compatibility mode with no WCT.");
15.                     }
16.                     applyTransaction(t, -1 /* syncId */, null, caller);
17.                     return null;
18.                 }
19.                 // In cases where transition is already provided, the "readiness lifecycle" of the
20.                 // transition is determined outside of this transaction. However, if this is a
21.                 // direct call from shell, the entire transition lifecycle is contained in the
22.                 // provided transaction and thus we can setReady immediately after apply.
23.                 final boolean needsSetReady = transition == null && t != null;
24.                 final WindowContainerTransaction wct =
25.                         t != null ? t : new WindowContainerTransaction();
26.                 if (transition == null) {
27.                     if (type < 0) {
28.                         throw new IllegalArgumentException("Can't create transition with no type");
29.                     }
30.                     // If there is already a collecting transition, queue up a new transition and
31.                     // return that. The actual start and apply will then be deferred until that
32.                     // transition starts collecting. This should almost never happen except during
33.                     // tests.
34.                     if (mService.mWindowManager.mSyncEngine.hasActiveSync()) {
35.                         Slog.w(TAG, "startTransition() while one is already collecting.");
36.                         final Transition nextTransition = new Transition(type, 0 /* flags */,
37.                                 mTransitionController, mService.mWindowManager.mSyncEngine);
38.                         ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS,
39.                                 "Creating Pending Transition: %s", nextTransition);
40.                         mService.mWindowManager.mSyncEngine.queueSyncSet(
41.                                 // Make sure to collect immediately to prevent another transition
42.                                 // from sneaking in before it. Note: moveToCollecting internally
43.                                 // calls startSyncSet.
44.                                 () -> mTransitionController.moveToCollecting(nextTransition),
45.                                 () -> {
46.                                     nextTransition.start();
47.                                     applyTransaction(wct, -1 /*syncId*/, nextTransition, caller);
48.                                     if (needsSetReady) {
49.                                         nextTransition.setAllReady();
50.                                     }
51.                                 });
52.                         return nextTransition.getToken();
53.                     }
54.                     transition = mTransitionController.createTransition(type);
55.                 }
56.                 if (!transition.isCollecting() && !transition.isForcePlaying()) {
57.                     Slog.e(TAG, "Trying to start a transition that isn't collecting. This probably"
58.                             + " means Shell took too long to respond to a request. WM State may be"
59.                             + " incorrect now, please file a bug");
60.                     applyTransaction(wct, -1 /*syncId*/, null /*transition*/, caller);
61.                     return transition.getToken();
62.                 }
63.                 transition.start();  /到这里
64.                 transition.mLogger.mStartWCT = wct;
65.                 applyTransaction(wct, -1 /*syncId*/, transition, caller);
66.                 if (needsSetReady) {
67.                     transition.setAllReady();
68.                 }
69.                 return transition.getToken();
70.             }
71.         } finally {
72.             Binder.restoreCallingIdentity(ident);
73.         }
74.     }

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04-23 18:44:02.186 2107 2323 D jinyanmeiainima: BLASTSyncEngine setReady ready:true
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: java.lang.RuntimeException: setReady
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at com.android.server.wm.BLASTSyncEngine$SyncGroup.setReady(BLASTSyncEngine.java:240)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at com.android.server.wm.BLASTSyncEngine$SyncGroup.-$$Nest$msetReady(Unknown Source:0)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at com.android.server.wm.BLASTSyncEngine.setReady(BLASTSyncEngine.java:356)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at com.android.server.wm.Transition.applyReady(Transition.java:657)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at com.android.server.wm.Transition.start(Transition.java:446)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at com.android.server.wm.WindowOrganizerController.startTransition(WindowOrganizerController.java:335)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at com.android.server.wm.WindowOrganizerController.startTransition(WindowOrganizerController.java:267)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at android.window.IWindowOrganizerController$Stub.onTransact(IWindowOrganizerController.java:264)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at com.android.server.wm.WindowOrganizerController.onTransact(WindowOrganizerController.java:185)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at android.os.Binder.execTransactInternal(Binder.java:1343)
04-23 18:44:02.186 2107 2323 D jinyanmeiainima: at android.os.Binder.execTransact(Binder.java:1279)
然后调用到BLASTSyncEngine setReady 将动画状态置为ready
开始刷新

1.   BLASTSyncEngine.java     
2. private void setReady(boolean ready) {
4.             if (mReady == ready) {
5.                 return;
6.             }
7.             Slog.d("jinyanmeiainima","BLASTSyncEngine setReady              ready:" + ready, new RuntimeException("setReady"));
9.             ProtoLog.v(WM_DEBUG_SYNC_ENGINE, "SyncGroup %d: Set ready", mSyncId);
10.             mReady = ready;
11.             if (!ready) return;
12.             mWm.mWindowPlacerLocked.requestTraversal();
13.         }

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1. private static final class ActiveTransition {
2.     IBinder mToken;
3.     TransitionHandler mHandler;
4.     boolean mAborted;
5.     TransitionInfo mInfo;
6.     SurfaceControl.Transaction mStartT;
7.     SurfaceControl.Transaction mFinishT;
9.     /** Ordered list of transitions which have been merged into this one. */
10.     private ArrayList<ActiveTransition> mMerged;
11. }

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onTransactionReady阶段

2.1 数据准备，筛选要做动画的对象

刷新时调用到 wm services. onTransactionReady 

1. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: Transition onTransactionReady mToken:Token{a674b32 TransitionRecord{d9c7094 id=6 type=TO_FRONT flags=0}}
3. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: Transition onTransactionReady info:{t=TO_FRONT f=0x0 ro=Point(0, 0) c=[{WCT{RemoteToken{2a5ead1 Task{c299c5e #39 type=standard A=10245:com..notes}}} m=SHOW f=TRANSLUCENT leash=Surface(name=Task=39)/@0x2c4c3d4 sb=Rect(0, 0 - 1800, 2880) eb=Rect(799, 141 - 1759, 1848) eo=Point(799, 141)}]}
4. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: Transition onTransactionReady transaction:android.view.SurfaceControl$Transaction@65dbba
5. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: Transition onTransactionReady mFinishTransaction:android.view.SurfaceControl$Transaction@2d6a6b
6. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: java.lang.RuntimeException: jinyanmeiainima
7. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.Transition.onTransactionReady(Transition.java:1215)
8. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.BLASTSyncEngine$SyncGroup.finishNow(BLASTSyncEngine.java:206) //这里会从队列移除
9. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.BLASTSyncEngine$SyncGroup.onSurfacePlacement(BLASTSyncEngine.java:148)
10. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.BLASTSyncEngine$SyncGroup.-$$Nest$monSurfacePlacement(Unknown Source:0)
11. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.BLASTSyncEngine.onSurfacePlacement(BLASTSyncEngine.java:382)
12. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.RootWindowContainer.performSurfacePlacementNoTrace(RootWindowContainer.java:893)
13. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.RootWindowContainer.performSurfacePlacement(RootWindowContainer.java:836)
14. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.WindowSurfacePlacer.performSurfacePlacementLoop(WindowSurfacePlacer.java:200)
15. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.WindowSurfacePlacer.performSurfacePlacement(WindowSurfacePlacer.java:149)
16. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.WindowSurfacePlacer.performSurfacePlacement(WindowSurfacePlacer.java:138)
17. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.wm.WindowSurfacePlacer$Traverser.run(WindowSurfacePlacer.java:80)
18. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at android.os.Handler.handleCallback(Handler.java:958)
19. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at android.os.Handler.dispatchMessage(Handler.java:99)
20. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at android.os.Looper.loopOnce(Looper.java:216)
21. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at android.os.Looper.loop(Looper.java:305)
22. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at android.os.HandlerThread.run(HandlerThread.java:67)
23. 04-23 18:43:22.529 2073 2100 D jinyanmeiainima: at com.android.server.ServiceThread.run(ServiceThread.java:46)

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2. BLASTSyncEngine.java
3. private void finishNow() {
4.             mActiveSyncs.remove(mSyncId); //从队列移除
5. }

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Transition.onTransactionReady
mTargets = calculateTargets(mParticipants, mChanges); //计算mTargets
根据target 计算info
final TransitionInfo info = calculateTransitionInfo(mType, mFlags, mTargets, transaction);

1. Transition.java
2. public void onTransactionReady(int syncId, SurfaceControl.Transaction transaction) {
3.             
4. final ArrayMap<WindowContainer, ChangeInfo> mChanges = new ArrayMap<>(); //这里的mChanges 也是一个map
6.         mTargets = calculateTargets(mParticipants, mChanges);
7.         final TransitionInfo info = calculateTransitionInfo(mType, mFlags, mTargets, transaction);
8.         
9.                 mController.getTransitionPlayer().onTransitionReady(
10.                         mToken, info, transaction, mFinishTransaction);
11.                 if (Trace.isTagEnabled(TRACE_TAG_WINDOW_MANAGER)) {
12.                     Trace.asyncTraceBegin(TRACE_TAG_WINDOW_MANAGER, TRACE_NAME_PLAY_TRANSITION,
13.             
14.     }

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wm.services.Transition.calculateTargets
两个条件不添加动画：
1：!wc.isAttached()
2：!changeInfo.hasChanged()
将符合条件的changeInfo添加到targets 返回

1. @VisibleForTesting
2. @NonNull
3. static ArrayList<ChangeInfo> calculateTargets(ArraySet<WindowContainer> participants,
4.         ArrayMap<WindowContainer, ChangeInfo> changes) {
5.     ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS,
6.             "Start calculating TransitionInfo based on participants: %s", participants);
8.     // Add all valid participants to the target container.
9.     final Targets targets = new Targets();
10.     for (int i = participants.size() - 1; i >= 0; --i) {
11.         final WindowContainer<?> wc = participants.valueAt(i);
12.         if (!wc.isAttached()) {   
13.             ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS,
14.                     "  Rejecting as detached: %s", wc);
15.             continue;
16.         }
17.         // The level of transition target should be at least window token.
18.         if (wc.asWindowState() != null) continue;
20.         final ChangeInfo changeInfo = changes.get(wc); // changes即mChanges，由onTransitionReady时添加到changes 的map //这里的changeInfo 与TransitionInfo不是一个
22.         // Reject no-ops
23.         if (!changeInfo.hasChanged()) {
24.             ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS,
25.                     "  Rejecting as no-op: %s", wc);
26.             continue;
27.         }
28.         targets.add(changeInfo);
29.     }
30.     ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS, "  Initial targets: %s",
31.             targets.mArray);
32.     // Combine the targets from bottom to top if possible.
33.     tryPromote(targets, changes);
34.     // Establish the relationship between the targets and their top changes.
35.     populateParentChanges(targets, changes);
37.     final ArrayList<ChangeInfo> targetList = targets.getListSortedByZ();
38.     ProtoLog.v(ProtoLogGroup.WM_DEBUG_WINDOW_TRANSITIONS, "  Final targets: %s", targetList);
39.     return targetList;
40. }

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2. boolean hasChanged() {
3.          // the task including transient launch must promote to root task
4.          if ((mFlags & ChangeInfo.FLAG_TRANSIENT_LAUNCH) != 0
5.                  || (mFlags & ChangeInfo.FLAG_ABOVE_TRANSIENT_LAUNCH) != 0) {
6.              return true;
7.          }
8.          // If it's invisible and hasn't changed visibility, always return false since even if
9.          // something changed, it wouldn't be a visible change.
10.          final boolean currVisible = mContainer.isVisibleRequested();
11.          if (currVisible == mVisible && !mVisible) return false;
12.          return currVisible != mVisible
13.                  || mKnownConfigChanges != 0
14.                  // if mWindowingMode is 0, this container wasn't attached at collect time, so
15.                  // assume no change in windowing-mode.
16.                  || (mWindowingMode != 0 && mContainer.getWindowingMode() != mWindowingMode)
17.                  || !mContainer.getBounds().equals(mAbsoluteBounds)
18.                  || mRotation != mContainer.getWindowConfiguration().getRotation();
19.      }

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根据上步计算出来的sortedTargets计算要做的动画TransitionInfo
TransitionInfo中有个mChanges

1. public final class TransitionInfo implements Parcelable {
3.     /**
4.      * Modes are only a sub-set of all the transit-types since they are per-container
5.      * @hide
6.      */
7.     @IntDef(prefix = { "TRANSIT_" }, value = {
8.             TRANSIT_NONE,
9.             TRANSIT_OPEN,
10.             TRANSIT_CLOSE,
11.             // Note: to_front/to_back really mean show/hide respectively at the container level.
12.             TRANSIT_TO_FRONT,
13.             TRANSIT_TO_BACK,
14.             TRANSIT_CHANGE
15.     })
16.     public @interface TransitionMode {}
17.     private final ArrayList<Change> mChanges = new ArrayList<>();

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1. public static final class Change implements Parcelable {
2.     private final WindowContainerToken mContainer;
3.     private WindowContainerToken mParent;
4.     private WindowContainerToken mLastParent;
5.     private final SurfaceControl mLeash;
6.     private @TransitionMode int mMode = TRANSIT_NONE;
7.     private @ChangeFlags int mFlags = FLAG_NONE;
8.     private final Rect mStartAbsBounds = new Rect();
9.     private final Rect mEndAbsBounds = new Rect();
10.     private final Point mEndRelOffset = new Point();
11.     private ActivityManager.RunningTaskInfo mTaskInfo = null;
12.     private boolean mAllowEnterPip;
13.     private @Surface.Rotation int mStartRotation = ROTATION_UNDEFINED;
14.     private @Surface.Rotation int mEndRotation = ROTATION_UNDEFINED;
15.     /**
16.      * The end rotation of the top activity after fixed rotation is finished. If the top
17.      * activity is not in fixed rotation, it will be {@link ROTATION_UNDEFINED}.
18.      */
19.     private @Surface.Rotation int mEndFixedRotation = ROTATION_UNDEFINED;
20.     private int mRotationAnimation = ROTATION_ANIMATION_UNSPECIFIED;
21.     private @ColorInt int mBackgroundColor;
22.     private SurfaceControl mSnapshot = null;
23.     private float mSnapshotLuma;

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1. static TransitionInfo calculateTransitionInfo(@TransitionType int type, int flags,
2.         ArrayList<ChangeInfo> sortedTargets,
3.         @Nullable SurfaceControl.Transaction startT) {
4.     final TransitionInfo out = new TransitionInfo(type, flags);  //根据type 和flags 构建新的TransitionInfo 对象
6.     WindowContainer<?> topApp = null;
7.     for (int i = 0; i < sortedTargets.size(); i++) {
8.         final WindowContainer<?> wc = sortedTargets.get(i).mContainer;
9.         if (!isWallpaper(wc)) {
10.             topApp = wc;
11.             break;
12.         }
13.     }
14.     if (topApp == null) {
15.         out.setRootLeash(new SurfaceControl(), 0, 0);
16.         return out;
17.     }
19.     WindowContainer<?> ancestor = findCommonAncestor(sortedTargets, topApp);
21.     // Make leash based on highest (z-order) direct child of ancestor with a participant.
22.     // TODO(b/261418859): Handle the case when the target contains window containers which
23.     // belong to a different display. As a workaround we use topApp, from which wallpaper
24.     // window container is removed, instead of sortedTargets here.
25.     WindowContainer leashReference = topApp;
26.     while (leashReference.getParent() != ancestor) {
27.         leashReference = leashReference.getParent();
28.     }
29.     final SurfaceControl rootLeash = leashReference.makeAnimationLeash().setName(
30.             "Transition Root: " + leashReference.getName()).build();
31.     startT.setLayer(rootLeash, leashReference.getLastLayer());                              // 设置layer
32.     out.setRootLeash(rootLeash, ancestor.getBounds().left, ancestor.getBounds().top);    //设置leash
34.     // Convert all the resolved ChangeInfos into TransactionInfo.Change objects in order.
35.     final int count = sortedTargets.size();                      //遍历上一步筛选出来的sortedTargets
36.     for (int i = 0; i < count; ++i) {
37.         final ChangeInfo info = sortedTargets.get(i);
38.         final WindowContainer target = info.mContainer;
39.         final TransitionInfo.Change change = new TransitionInfo.Change(
40.                 target.mRemoteToken != null ? target.mRemoteToken.toWindowContainerToken()     //根据windwoContainer的成员变量mWindowContainerToken 构建一个change所以每个windwoContainer都有一个change
41.                         : null, getLeashSurface(target, startT));
42.         // TODO(shell-transitions): Use leash for non-organized windows.
43.         if (info.mEndParent != null) {
44.             change.setParent(info.mEndParent.mRemoteToken.toWindowContainerToken());
45.         }
46.         if (info.mStartParent != null && info.mStartParent.mRemoteToken != null
47.                 && target.getParent() != info.mStartParent) {
48.             change.setLastParent(info.mStartParent.mRemoteToken.toWindowContainerToken());
49.         }
50.         change.setMode(info.getTransitMode(target));
51.         change.setStartAbsBounds(info.mAbsoluteBounds);
52.         change.setFlags(info.getChangeFlags(target));
55.         final Task task = target.asTask();
56.         final TaskFragment taskFragment = target.asTaskFragment();
57.         final ActivityRecord activityRecord = target.asActivityRecord();
59.         if (task != null) {
60.             final ActivityManager.RunningTaskInfo tinfo = new ActivityManager.RunningTaskInfo();
61.             task.fillTaskInfo(tinfo);
62.             change.setTaskInfo(tinfo);
63.             change.setRotationAnimation(getTaskRotationAnimation(task));
64.             final ActivityRecord topMostActivity = task.getTopMostActivity();
65.             change.setAllowEnterPip(topMostActivity != null
66.                     && topMostActivity.checkEnterPictureInPictureAppOpsState());
67.             final ActivityRecord topRunningActivity = task.topRunningActivity();
68.             if (topRunningActivity != null && task.mDisplayContent != null
69.                     // Display won't be rotated for multi window Task, so the fixed rotation
70.                     // won't be applied. This can happen when the windowing mode is changed
71.                     // before the previous fixed rotation is applied.
72.                     && !task.inMultiWindowMode()) {
73.                 // If Activity is in fixed rotation, its will be applied with the next rotation,
74.                 // when the Task is still in the previous rotation.
75.                 final int taskRotation = task.getWindowConfiguration().getDisplayRotation();
76.                 final int activityRotation = topRunningActivity.getWindowConfiguration()
77.                         .getDisplayRotation();
78.                 if (taskRotation != activityRotation) {
79.                     change.setEndFixedRotation(activityRotation);
80.                 }
81.             }
82.         } else if ((info.mFlags & ChangeInfo.FLAG_SEAMLESS_ROTATION) != 0) {
83.             change.setRotationAnimation(ROTATION_ANIMATION_SEAMLESS);
84.         }
86.         final WindowContainer<?> parent = target.getParent();
87.         final Rect bounds = target.getBounds();
88.         final Rect parentBounds = parent.getBounds();
89.         change.setEndRelOffset(bounds.left - parentBounds.left,
90.                 bounds.top - parentBounds.top);
91.         int endRotation = target.getWindowConfiguration().getRotation();
92.         if (activityRecord != null) {
93.             // TODO(b/227427984): Shell needs to aware letterbox.
94.             // Always use parent bounds of activity because letterbox area (e.g. fixed aspect
95.             // ratio or size compat mode) should be included in the animation.
96.             change.setEndAbsBounds(parentBounds);
97.             if (activityRecord.getRelativeDisplayRotation() != 0
98.                     && !activityRecord.mTransitionController.useShellTransitionsRotation()) {
99.                 // Use parent rotation because shell doesn't know the surface is rotated.
100.                 endRotation = parent.getWindowConfiguration().getRotation();
101.             }
102.         } else {
103.             change.setEndAbsBounds(bounds);
104.         }
106.         if (activityRecord != null || (taskFragment != null && taskFragment.isEmbedded())) {
107.             final int backgroundColor;
108.             final TaskFragment organizedTf = activityRecord != null
109.                     ? activityRecord.getOrganizedTaskFragment()
110.                     : taskFragment.getOrganizedTaskFragment();
111.             if (organizedTf != null && organizedTf.getAnimationParams()
112.                     .getAnimationBackgroundColor() != DEFAULT_ANIMATION_BACKGROUND_COLOR) {
113.                 // This window is embedded and has an animation background color set on the
114.                 // TaskFragment. Pass this color with this window, so the handler can use it as
115.                 // the animation background color if needed,
116.                 backgroundColor = organizedTf.getAnimationParams()
117.                         .getAnimationBackgroundColor();
118.             } else {
119.                 // Set background color to Task theme color for activity and embedded
120.                 // TaskFragment in case we want to show background during the animation.
121.                 final Task parentTask = activityRecord != null
122.                         ? activityRecord.getTask()
123.                         : taskFragment.getTask();
124.                 backgroundColor = parentTask.getTaskDescription().getBackgroundColor();
125.             }
126.             // Set to opaque for animation background to prevent it from exposing the blank
127.             // background or content below.
128.             change.setBackgroundColor(ColorUtils.setAlphaComponent(backgroundColor, 255));
129.         }
131.         change.setRotation(info.mRotation, endRotation);
132.         if (info.mSnapshot != null) {
133.             change.setSnapshot(info.mSnapshot, info.mSnapshotLuma);
134.         }
136.         out.addChange(change);  //最后把widowContainer的change放入mChanger中out（TransitionInfo）中
137.     }
139.     TransitionInfo.AnimationOptions animOptions = null;
140.     if (topApp.asActivityRecord() != null) {
141.         final ActivityRecord topActivity = topApp.asActivityRecord();
142.         animOptions = addCustomActivityTransition(topActivity, true/* open */, null);
143.         animOptions = addCustomActivityTransition(topActivity, false/* open */, animOptions);
144.     }
145.     final WindowManager.LayoutParams animLp =
146.             getLayoutParamsForAnimationsStyle(type, sortedTargets);
147.     if (animLp != null && animLp.type != TYPE_APPLICATION_STARTING
148.             && animLp.windowAnimations != 0) {
149.         // Don't send animation options if no windowAnimations have been set or if the we are
150.         // running an app starting animation, in which case we don't want the app to be able to
151.         // change its animation directly.
152.         if (animOptions != null) {
153.             animOptions.addOptionsFromLayoutParameters(animLp);
154.         } else {
155.             animOptions = TransitionInfo.AnimationOptions
156.                     .makeAnimOptionsFromLayoutParameters(animLp);
157.         }
158.     }
159.     if (animOptions != null) {
160.         out.setAnimationOptions(animOptions);
161.     }
163.     return out;
164. }

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2.2 开始动画

到shell.onTransitionReady

1. @BinderThread
2. private class TransitionPlayerImpl extends ITransitionPlayer.Stub {
3.     @Override
4.     public void onTransitionReady(IBinder iBinder, TransitionInfo transitionInfo,
5.             SurfaceControl.Transaction t, SurfaceControl.Transaction finishT)
6.             throws RemoteException {
7.         mMainExecutor.execute(() -> Transitions.this.onTransitionReady(
8.                 iBinder, transitionInfo, t, finishT));
9.     }
11.     @Override
12.     public void requestStartTransition(IBinder iBinder,
13.             TransitionRequestInfo request) throws RemoteException {
14.         mMainExecutor.execute(() -> Transitions.this.requestStartTransition(iBinder, request));
15.     }
16. }

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1. void onTransitionReady(@NonNull IBinder transitionToken, @NonNull TransitionInfo info,
2.             @NonNull SurfaceControl.Transaction t, @NonNull SurfaceControl.Transaction finishT) {
3.         ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TRANSITIONS, "onTransitionReady %s: %s",
4.                 transitionToken, info);
5.         final int activeIdx = findByToken(mPendingTransitions, transitionToken);
6.         if (activeIdx < 0) {
7.             throw new IllegalStateException("Got transitionReady for non-pending transition "
8.                     + transitionToken + ". expecting one of "
9.                     + Arrays.toString(mPendingTransitions.stream().map(
10.                             activeTransition -> activeTransition.mToken).toArray()));
11.         }
12.         if (activeIdx > 0) {
13.             Log.e(TAG, "Transition became ready out-of-order " + transitionToken + ". Expected"
14.                     + " order: " + Arrays.toString(mPendingTransitions.stream().map(
15.                             activeTransition -> activeTransition.mToken).toArray()));
16.         }
17.         // Move from pending to ready
18.         final ActiveTransition active = mPendingTransitions.remove(activeIdx);//从 mPendingTransitions 移除
19.         mReadyTransitions.add(active); //添加至 mReadyTransitions
20.         active.mInfo = info;
21.         active.mStartT = t;
22.         active.mFinishT = finishT;
24.         for (int i = 0; i < mObservers.size(); ++i) {
25.             mObservers.get(i).onTransitionReady(transitionToken, info, t, finishT);
26.         }
28.         if (info.getType() == TRANSIT_SLEEP) {
29.             if (activeIdx > 0) {
30.                 if (!info.getRootLeash().isValid()) {
31.                     // Shell has some debug settings which makes calling binders with invalid
32.                     // surfaces crash, so replace it with a "real" one.
33.                     info.setRootLeash(new SurfaceControl.Builder().setName("Invalid")
34.                             .setContainerLayer().build(), 0, 0);
35.                 }
36.                 // Sleep starts a process of forcing all prior transitions to finish immediately
37.                 finishForSleep(null /* forceFinish */);
38.                 return;
39.             }
40.         }
42.         // Allow to notify keyguard un-occluding state to KeyguardService, which can happen while
43.         // screen-off, so there might no visibility change involved.
44.         if (!info.getRootLeash().isValid() && info.getType() != TRANSIT_KEYGUARD_UNOCCLUDE) {
45.             // Invalid root-leash implies that the transition is empty/no-op, so just do
46.             // housekeeping and return.
47.             ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TRANSITIONS, "Invalid root leash (%s): %s",
48.                     transitionToken, info);
49.             onAbort(active);
50.             return;
51.         }
53.         final int changeSize = info.getChanges().size(); //找到带有change的info
54.         boolean taskChange = false;
55.         boolean transferStartingWindow = false;
56.         boolean allOccluded = changeSize > 0;
57.         for (int i = changeSize - 1; i >= 0; --i) {
58.             final TransitionInfo.Change change = info.getChanges().get(i);
59.             taskChange |= change.getTaskInfo() != null;
60.             transferStartingWindow |= change.hasFlags(FLAG_STARTING_WINDOW_TRANSFER_RECIPIENT);
61.             if (!change.hasFlags(FLAG_IS_OCCLUDED)) {
62.                 allOccluded = false;
63.             }
64.         }
65.         // There does not need animation when:
66.         // A. Transfer starting window. Apply transfer starting window directly if there is no other
67.         // task change. Since this is an activity->activity situation, we can detect it by selecting
68.         // transitions with only 2 changes where neither are tasks and one is a starting-window
69.         // recipient.
70.         if (!taskChange && transferStartingWindow && changeSize == 2
71.                 // B. It's visibility change if the TRANSIT_TO_BACK/TO_FRONT happened when all
72.                 // changes are underneath another change.
73.                 || ((info.getType() == TRANSIT_TO_BACK || info.getType() == TRANSIT_TO_FRONT)
74.                 && allOccluded)) {
75.             // Treat this as an abort since we are bypassing any merge logic and effectively
76.             // finishing immediately.
77.             onAbort(active);
78.             return;
79.         }
81.         setupStartState(active.mInfo, active.mStartT, active.mFinishT);    //开始置状态
83.         if (mReadyTransitions.size() > 1) {
84.             // There are already transitions waiting in the queue, so just return.
85.             return;
86.         }
87.         processReadyQueue();  //开始动画
88.     }

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1. 04-23 18:44:02.339 2107 2246 D jinyanmeiainima: BLASTSyncEngine finishNow s.mSyncId:5
2. 04-23 18:44:02.339 2107 2246 D jinyanmeiainima: BLASTSyncEngine finishNow mActiveSyncs++++:1
3. 04-23 18:44:02.339 2107 2246 D jinyanmeiainima: BLASTSyncEngine finishNow s.mSyncId:5
4. 04-23 18:44:02.339 2107 2246 D jinyanmeiainima: BLASTSyncEngine finishNow mActiveSyncs++++:0
5. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: startAnimation TRANSIT_CHANGE:
6. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: java.lang.RuntimeException: jinyanmeiainima
7. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions.dispatchTransition(Transitions.java:708)
8. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions.playTransition(Transitions.java:693)
9. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions.processReadyQueue(Transitions.java:627)
10. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions.onTransitionReady(Transitions.java:600)
11. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions$TransitionPlayerImpl.lambda$onTransitionReady$0(Transitions.java:1122)
12. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions$TransitionPlayerImpl.$r8$lambda$qsRfWn1ItrZqnFeABBdxU50jPc4(Unknown Source:0)
13. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at com.android.wm.shell.transition.Transitions$TransitionPlayerImpl$$ExternalSyntheticLambda0.run(Unknown Source:10)
14. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at android.os.Handler.handleCallback(Handler.java:958)
15. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at android.os.Handler.dispatchMessage(Handler.java:99)
16. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at android.os.Looper.loopOnce(Looper.java:216)
17. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at android.os.Looper.loop(Looper.java:305)
18. 04-23 18:44:02.347 3002 3197 D jinyanmeiainima: at android.os.HandlerThread.run(HandlerThread.java:67)

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然后各个继承于

1. implements Transitions.TransitionHandler 的对象都会调用到startAnimation

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走各个业务动画逻辑

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