动画的类型如下
@IntDef(flag = true, prefix = { "ANIMATION_TYPE_" }, value = {ANIMATION_TYPE_NONE,ANIMATION_TYPE_APP_TRANSITION,ANIMATION_TYPE_SCREEN_ROTATION,ANIMATION_TYPE_DIMMER,ANIMATION_TYPE_RECENTS,ANIMATION_TYPE_WINDOW_ANIMATION,ANIMATION_TYPE_INSETS_CONTROL,ANIMATION_TYPE_TOKEN_TRANSFORM,ANIMATION_TYPE_STARTING_REVEAL})ANIMATION_TYPE_APP_TRANSITION动画
当点击一个二级页面时, 会有如下调用栈
动画的type = ANIMATION_TYPE_APP_TRANSITION
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: SurfaceAnimator startAnimation mAnimation:com.android.server.wm.LocalAnimationAdapter@71444ae
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: SurfaceAnimator startAnimation mLeash:Surface(name=Surface(name=ActivityRecord{8b5f0f2 u0 com.android.settings/.MainSettings} t76})/@0xaa929f3 - animation-leash of app_transition)/@0x9c116b0
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: SurfaceAnimator startAnimation t:android.view.SurfaceControl$Transaction@8d14824
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: SurfaceAnimator startAnimation type:1
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: SurfaceAnimator startAnimation mInnerAnimationFinishedCallback:com.android.server.wm.SurfaceAnimator$$ExternalSyntheticLambda0@d22724f
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: java.lang.RuntimeException: jinyanmeianimation
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.SurfaceAnimator.startAnimation(SurfaceAnimator.java:200)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.WindowContainer.startAnimation(WindowContainer.java:2912)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.WindowContainer$AnimationRunnerBuilder.lambda$build$4$com-android-server-wm-WindowContainer$AnimationRunnerBuilder(WindowContainer.java:4257)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.WindowContainer$AnimationRunnerBuilder$$ExternalSyntheticLambda4.startAnimation(Unknown Source:7)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.WindowContainer.applyAnimationUnchecked(WindowContainer.java:3384)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.WindowContainer.applyAnimation(WindowContainer.java:3072)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.ActivityRecord.applyAnimation(ActivityRecord.java:6074)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.AppTransitionController.applyAnimations(AppTransitionController.java:876)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.AppTransitionController.applyAnimations(AppTransitionController.java:1083)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.AppTransitionController.handleAppTransitionReady(AppTransitionController.java:293)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.RootWindowContainer.checkAppTransitionReady(RootWindowContainer.java:1070)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.RootWindowContainer.performSurfacePlacementNoTrace(RootWindowContainer.java:937)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.RootWindowContainer.performSurfacePlacement(RootWindowContainer.java:877)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.WindowSurfacePlacer.performSurfacePlacementLoop(WindowSurfacePlacer.java:199)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.WindowSurfacePlacer.performSurfacePlacement(WindowSurfacePlacer.java:148)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.WindowSurfacePlacer.performSurfacePlacement(WindowSurfacePlacer.java:137)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at com.android.server.wm.WindowSurfacePlacer$Traverser.run(WindowSurfacePlacer.java:79)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at android.os.Handler.handleCallback(Handler.java:942)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at android.os.Handler.dispatchMessage(Handler.java:99)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at android.os.Looper.loopOnce(Looper.java:211)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at android.os.Looper.loop(Looper.java:300)
03-05 14:55:37.752 3059 3163 D jinyanmeianimation: at android.os.HandlerThread.run(HandlerThread.java:67)
每次循环都要检查是否开始一个动画
void handleAppTransitionReady() {
183 mTempTransitionReasons.clear();
// //检查app transition是否已经准备好184 if (!transitionGoodToGo(mDisplayContent.mOpeningApps, mTempTransitionReasons)
185 || !transitionGoodToGo(mDisplayContent.mChangingContainers, mTempTransitionReasons)
186 || !transitionGoodToGoForTaskFragments()) {
187 return;
188 }
189 Trace.traceBegin(Trace.TRACE_TAG_WINDOW_MANAGER, "AppTransitionReady");
190
191 ProtoLog.v(WM_DEBUG_APP_TRANSITIONS, "**** GOOD TO GO");
192 // TODO(b/205335975): Remove window which stuck in animatingExit status. Find actual cause.
193 mDisplayContent.forAllWindows(WindowState::cleanupAnimatingExitWindow,
194 true /* traverseTopToBottom */);
195 // TODO(new-app-transition): Remove code using appTransition.getAppTransition()
196 final AppTransition appTransition = mDisplayContent.mAppTransition;
197
198 mDisplayContent.mNoAnimationNotifyOnTransitionFinished.clear();
199
200 appTransition.removeAppTransitionTimeoutCallbacks();
201
202 mDisplayContent.mWallpaperMayChange = false;
203
204 int appCount = mDisplayContent.mOpeningApps.size();
205 for (int i = 0; i < appCount; ++i) {
206 // Clearing the mAnimatingExit flag before entering animation. It's set to true if app
207 // window is removed, or window relayout to invisible. This also affects window
208 // visibility. We need to clear it *before* maybeUpdateTransitToWallpaper() as the
209 // transition selection depends on wallpaper target visibility.
210 mDisplayContent.mOpeningApps.valueAtUnchecked(i).clearAnimatingFlags();
211 }
212 appCount = mDisplayContent.mChangingContainers.size();
213 for (int i = 0; i < appCount; ++i) {
214 // Clearing for same reason as above.
215 final ActivityRecord activity = getAppFromContainer(
216 mDisplayContent.mChangingContainers.valueAtUnchecked(i));
217 if (activity != null) {
218 activity.clearAnimatingFlags();
219 }
220 }
221
222 // Adjust wallpaper before we pull the lower/upper target, since pending changes
223 // (like the clearAnimatingFlags() above) might affect wallpaper target result.
224 // Or, the opening app window should be a wallpaper target.
225 mWallpaperControllerLocked.adjustWallpaperWindowsForAppTransitionIfNeeded(
226 mDisplayContent.mOpeningApps);
227
228 // Remove launcher from app transition animation while recents is running. Recents animation
229 // is managed outside of app transition framework, so we just need to commit visibility.
230 final boolean excludeLauncherFromAnimation =
231 mDisplayContent.mOpeningApps.stream().anyMatch(
232 (app) -> app.isAnimating(PARENTS, ANIMATION_TYPE_RECENTS))
233 || mDisplayContent.mClosingApps.stream().anyMatch(
234 (app) -> app.isAnimating(PARENTS, ANIMATION_TYPE_RECENTS));
235 final ArraySet<ActivityRecord> openingAppsForAnimation = getAppsForAnimation(
236 mDisplayContent.mOpeningApps, excludeLauncherFromAnimation);
237 final ArraySet<ActivityRecord> closingAppsForAnimation = getAppsForAnimation(
238 mDisplayContent.mClosingApps, excludeLauncherFromAnimation);
239
240 @TransitionOldType final int transit = getTransitCompatType(
241 mDisplayContent.mAppTransition, openingAppsForAnimation, closingAppsForAnimation,
242 mDisplayContent.mChangingContainers,
243 mWallpaperControllerLocked.getWallpaperTarget(), getOldWallpaper(),
244 mDisplayContent.mSkipAppTransitionAnimation);
245 mDisplayContent.mSkipAppTransitionAnimation = false;
246
247 ProtoLog.v(WM_DEBUG_APP_TRANSITIONS,
248 "handleAppTransitionReady: displayId=%d appTransition={%s}"
249 + " excludeLauncherFromAnimation=%b openingApps=[%s] closingApps=[%s] transit=%s",
250 mDisplayContent.mDisplayId, appTransition.toString(), excludeLauncherFromAnimation,
251 mDisplayContent.mOpeningApps, mDisplayContent.mClosingApps,
252 AppTransition.appTransitionOldToString(transit));
253
254 // Find the layout params of the top-most application window in the tokens, which is
255 // what will control the animation theme. If all closing windows are obscured, then there is
256 // no need to do an animation. This is the case, for example, when this transition is being
257 // done behind a dream window.
258 final ArraySet<Integer> activityTypes = collectActivityTypes(openingAppsForAnimation,
259 closingAppsForAnimation, mDisplayContent.mChangingContainers);
//首先会获取当前需要opening和closing的app window列表（ActivityRecord类型）
260 final ActivityRecord animLpActivity = findAnimLayoutParamsToken(transit, activityTypes,
261 openingAppsForAnimation, closingAppsForAnimation,
262 mDisplayContent.mChangingContainers);
263 final ActivityRecord topOpeningApp =
264 getTopApp(openingAppsForAnimation, false /* ignoreHidden */);
265 final ActivityRecord topClosingApp =
266 getTopApp(closingAppsForAnimation, false /* ignoreHidden */);
267 final ActivityRecord topChangingApp =
268 getTopApp(mDisplayContent.mChangingContainers, false /* ignoreHidden */);
269 final WindowManager.LayoutParams animLp = getAnimLp(animLpActivity);
270
271 // Check if there is any override
272 if (!overrideWithTaskFragmentRemoteAnimation(transit, activityTypes)) {
273 // Unfreeze the windows that were previously frozen for TaskFragment animation.
274 unfreezeEmbeddedChangingWindows();
275 overrideWithRemoteAnimationIfSet(animLpActivity, transit, activityTypes);
276 }
277
278 final boolean voiceInteraction = containsVoiceInteraction(closingAppsForAnimation)
279 || containsVoiceInteraction(openingAppsForAnimation);
280
281 final int layoutRedo;
282 mService.mSurfaceAnimationRunner.deferStartingAnimations();
283 try {
//然后在applyAnimations方法里面对window列表进行遍历WindowContainer的动画applyAnimation方法的调用
284 applyAnimations(openingAppsForAnimation, closingAppsForAnimation, transit, animLp,
285 voiceInteraction);
286 handleClosingApps();
287 handleOpeningApps();
288 handleChangingApps(transit);
289
290 appTransition.setLastAppTransition(transit, topOpeningApp,
291 topClosingApp, topChangingApp);
292
293 final int flags = appTransition.getTransitFlags();
294 layoutRedo = appTransition.goodToGo(transit, topOpeningApp);
295 handleNonAppWindowsInTransition(transit, flags);
296 appTransition.postAnimationCallback();
297 appTransition.clear();
298 } finally {
299 mService.mSurfaceAnimationRunner.continueStartingAnimations();
300 }
301
302 mService.mTaskSnapshotController.onTransitionStarting(mDisplayContent);
303
304 mDisplayContent.mOpeningApps.clear();
305 mDisplayContent.mClosingApps.clear();
306 mDisplayContent.mChangingContainers.clear();
307 mDisplayContent.mUnknownAppVisibilityController.clear();
308
309 // This has changed the visibility of windows, so perform
310 // a new layout to get them all up-to-date.
311 mDisplayContent.setLayoutNeeded();
312
313 mDisplayContent.computeImeTarget(true /* updateImeTarget */);
314
315 mService.mAtmService.mTaskSupervisor.getActivityMetricsLogger().notifyTransitionStarting(
316 mTempTransitionReasons);
317
318 Trace.traceEnd(Trace.TRACE_TAG_WINDOW_MANAGER);
319
320 mDisplayContent.pendingLayoutChanges |=
321 layoutRedo | FINISH_LAYOUT_REDO_LAYOUT | FINISH_LAYOUT_REDO_CONFIG;
322 }applyAnimationUnchecked包含两部分,
第一先通过getAnimationAdapter加载合适的动画
如果是普通的窗口动画，比如app内部activity的切换，当前的场景是设置主菜单跳转子菜单，根据当前场景获取到具体的transit，transit=TRANSIT_OLD_ACTIVITY_OPEN，然后再结合enter为true或者false，可以最终可以找到设置主菜单的动画xml资源是activity_open_exit.xml，设置子菜单的动画xml资源是activity_open_enter.xml，在获取到具体xml资源名字后，通过AnimationUtils.loadAnimation方法把xml资源转成Animation对象。 之后就会创建一个WindowAnimationSpec对象，并把Animation对象作为构造方法的第一个参数传给了WindowAnimationSpec
第二开始动画
protected void applyAnimationUnchecked(WindowManager.LayoutParams lp, boolean enter,
2994 @TransitionOldType int transit, boolean isVoiceInteraction,
2995 @Nullable ArrayList<WindowContainer> sources) {
2996 final Task task = asTask();
2997 if (task != null && !enter && !task.isActivityTypeHomeOrRecents()) {
2998 final InsetsControlTarget imeTarget = mDisplayContent.getImeTarget(IME_TARGET_LAYERING);
2999 final boolean isImeLayeringTarget = imeTarget != null && imeTarget.getWindow() != null
3000 && imeTarget.getWindow().getTask() == task;
3001 // Attach and show the IME screenshot when the task is the IME target and performing
3002 // task closing transition to the next task.
3003 if (isImeLayeringTarget && AppTransition.isTaskCloseTransitOld(transit)) {
3004 mDisplayContent.showImeScreenshot();
3005 }
3006 }
3007 final Pair<AnimationAdapter, AnimationAdapter> adapters = getAnimationAdapter(lp,
3008 transit, enter, isVoiceInteraction);
3009 AnimationAdapter adapter = adapters.first;
3010 AnimationAdapter thumbnailAdapter = adapters.second;
3011 if (adapter != null) {
3012 if (sources != null) {
3013 mSurfaceAnimationSources.addAll(sources);
3014 }
3015
3016 AnimationRunnerBuilder animationRunnerBuilder = new AnimationRunnerBuilder();
3017
3018 if (isTaskTransitOld(transit)) {
3019 animationRunnerBuilder.setTaskBackgroundColor(getTaskAnimationBackgroundColor());
3020 // TODO: Remove when we migrate to shell (b/202383002)
3021 if (mWmService.mTaskTransitionSpec != null) {
3022 animationRunnerBuilder.hideInsetSourceViewOverflows(
3023 mWmService.mTaskTransitionSpec.animationBoundInsets);
3024 }
3025 }
3026
3027 final ActivityRecord activityRecord = asActivityRecord();
3028 if (activityRecord != null && isActivityTransitOld(transit)
3029 && adapter.getShowBackground()) {
3030 final @ColorInt int backgroundColorForTransition;
3031 if (adapter.getBackgroundColor() != 0) {
3032 // If available use the background color provided through getBackgroundColor
3033 // which if set originates from a call to overridePendingAppTransition.
3034 backgroundColorForTransition = adapter.getBackgroundColor();
3035 } else {
3036 // Otherwise default to the window's background color if provided through
3037 // the theme as the background color for the animation - the top most window
3038 // with a valid background color and showBackground set takes precedence.
3039 final Task arTask = activityRecord.getTask();
3040 backgroundColorForTransition = ColorUtils.setAlphaComponent(
3041 arTask.getTaskDescription().getBackgroundColor(), 255);
3042 }
3043 animationRunnerBuilder.setTaskBackgroundColor(backgroundColorForTransition);
3044 }
3045
3046 animationRunnerBuilder.build()
3047 .startAnimation(getPendingTransaction(), adapter, !isVisible(),
3048 ANIMATION_TYPE_APP_TRANSITION, thumbnailAdapter);
3049
3050 if (adapter.getShowWallpaper()) {
3051 getDisplayContent().pendingLayoutChanges |= FINISH_LAYOUT_REDO_WALLPAPER;
3052 }
3053 }
3054 }
3055 计算transition的类型
在getTransitCompatType中会对动画做转换，将动画转化为old类型的动画
@TransitionOldType static int getTransitCompatType(AppTransition appTransition,ArraySet<ActivityRecord> openingApps, ArraySet<ActivityRecord> closingApps,ArraySet<WindowContainer> changingContainers, @Nullable WindowState wallpaperTarget,@Nullable WindowState oldWallpaper, boolean skipAppTransitionAnimation) {Slog.d("jinyanmeianimation","getTransitCompatType appTransition :" + appTransition );Slog.d("jinyanmeianimation","getTransitCompatType appTransition :" + appTransition , new RuntimeException("jinyanmeianimation"));// Determine if closing and opening app token sets are wallpaper targets, in which case// special animations are needed.final boolean openingAppHasWallpaper = canBeWallpaperTarget(openingApps)&& wallpaperTarget != null;final boolean closingAppHasWallpaper = canBeWallpaperTarget(closingApps)&& wallpaperTarget != null;// Keyguard transit has highest priority.switch (appTransition.getKeyguardTransition()) {case TRANSIT_KEYGUARD_GOING_AWAY:return openingAppHasWallpaper ? TRANSIT_OLD_KEYGUARD_GOING_AWAY_ON_WALLPAPER: TRANSIT_OLD_KEYGUARD_GOING_AWAY;case TRANSIT_KEYGUARD_OCCLUDE:// When there is a closing app, the keyguard has already been occluded by an// activity, and another activity has started on top of that activity, so normal// app transition animation should be used.return closingApps.isEmpty() ? TRANSIT_OLD_KEYGUARD_OCCLUDE: TRANSIT_OLD_ACTIVITY_OPEN;case TRANSIT_KEYGUARD_UNOCCLUDE:return TRANSIT_OLD_KEYGUARD_UNOCCLUDE;}// This is not keyguard transition and one of the app has request to skip app transition.// MIUI MOD: START// For Stage Split Screen: Drag to enter split-screen feature.// if (skipAppTransitionAnimation) {if (skipAppTransitionAnimation ||ActivityTaskManagerServiceStub.get().removeSplitTaskShotIfNeed()) {// ENDreturn WindowManager.TRANSIT_OLD_UNSET;}@TransitionFlags final int flags = appTransition.getTransitFlags();@TransitionType final int firstTransit = appTransition.getFirstAppTransition();// Special transitions// TODO(new-app-transitions): Revisit if those can be rewritten by using flags.if (appTransition.containsTransitRequest(TRANSIT_CHANGE) && !changingContainers.isEmpty()) {// MIUI ADD: START Activity Embedding Resizingif (MiuiEmbeddingWindowServiceStub.get().skipAppTransitionAnimationForEmbeddingDivider()) {return WindowManager.TRANSIT_OLD_UNSET;}// END@TransitContainerType int changingType =getTransitContainerType(changingContainers.valueAt(0));switch (changingType) {case TYPE_TASK:return TRANSIT_OLD_TASK_CHANGE_WINDOWING_MODE;case TYPE_TASK_FRAGMENT:return TRANSIT_OLD_TASK_FRAGMENT_CHANGE;default:throw new IllegalStateException("TRANSIT_CHANGE with unrecognized changing type=" + changingType);}}if ((flags & TRANSIT_FLAG_APP_CRASHED) != 0) {return TRANSIT_OLD_CRASHING_ACTIVITY_CLOSE;}if (firstTransit == TRANSIT_NONE) {return TRANSIT_OLD_NONE;}/** There are cases where we open/close a new task/activity, but in reality only a* translucent activity on top of existing activities is opening/closing. For that one, we* have a different animation because non of the task/activity animations actually work well* with translucent apps.*/if (isNormalTransit(firstTransit)) {boolean allOpeningVisible = true;boolean allTranslucentOpeningApps = !openingApps.isEmpty();for (int i = openingApps.size() - 1; i >= 0; i--) {final ActivityRecord activity = openingApps.valueAt(i);if (!activity.isVisible()) {allOpeningVisible = false;if (activity.fillsParent()) {allTranslucentOpeningApps = false;}}}boolean allTranslucentClosingApps = !closingApps.isEmpty();for (int i = closingApps.size() - 1; i >= 0; i--) {if (closingApps.valueAt(i).fillsParent()) {allTranslucentClosingApps = false;break;}}if (allTranslucentClosingApps && allOpeningVisible) {return TRANSIT_OLD_TRANSLUCENT_ACTIVITY_CLOSE;}if (allTranslucentOpeningApps && closingApps.isEmpty()) {return TRANSIT_OLD_TRANSLUCENT_ACTIVITY_OPEN;}}final ActivityRecord topOpeningApp = getTopApp(openingApps,false /* ignoreHidden */);final ActivityRecord topClosingApp = getTopApp(closingApps,true /* ignoreHidden */);if (closingAppHasWallpaper && openingAppHasWallpaper) {ProtoLog.v(WM_DEBUG_APP_TRANSITIONS, "Wallpaper animation!");switch (firstTransit) {case TRANSIT_OPEN:case TRANSIT_TO_FRONT:return TRANSIT_OLD_WALLPAPER_INTRA_OPEN;case TRANSIT_CLOSE:case TRANSIT_TO_BACK:return TRANSIT_OLD_WALLPAPER_INTRA_CLOSE;}} else if (oldWallpaper != null && !openingApps.isEmpty()&& !openingApps.contains(oldWallpaper.mActivityRecord)&& closingApps.contains(oldWallpaper.mActivityRecord)&& topClosingApp == oldWallpaper.mActivityRecord) {// We are transitioning from an activity with a wallpaper to one without.return TRANSIT_OLD_WALLPAPER_CLOSE;} else if (wallpaperTarget != null && wallpaperTarget.isVisible()&& openingApps.contains(wallpaperTarget.mActivityRecord)&& topOpeningApp == wallpaperTarget.mActivityRecord/* && transit != TRANSIT_TRANSLUCENT_ACTIVITY_CLOSE */) {// We are transitioning from an activity without// a wallpaper to now showing the wallpaperreturn TRANSIT_OLD_WALLPAPER_OPEN;}final ArraySet<WindowContainer> openingWcs = getAnimationTargets(openingApps, closingApps, true /* visible */);final ArraySet<WindowContainer> closingWcs = getAnimationTargets(openingApps, closingApps, false /* visible */);final WindowContainer<?> openingContainer = !openingWcs.isEmpty()? openingWcs.valueAt(0) : null;final WindowContainer<?> closingContainer = !closingWcs.isEmpty()? closingWcs.valueAt(0) : null;@TransitContainerType int openingType = getTransitContainerType(openingContainer);@TransitContainerType int closingType = getTransitContainerType(closingContainer);if (appTransition.containsTransitRequest(TRANSIT_TO_FRONT) && openingType == TYPE_TASK) {return TRANSIT_OLD_TASK_TO_FRONT;}if (appTransition.containsTransitRequest(TRANSIT_TO_BACK) && closingType == TYPE_TASK) {return TRANSIT_OLD_TASK_TO_BACK;}if (appTransition.containsTransitRequest(TRANSIT_OPEN)) {if (openingType == TYPE_TASK) {return (appTransition.getTransitFlags() & TRANSIT_FLAG_OPEN_BEHIND) != 0? TRANSIT_OLD_TASK_OPEN_BEHIND : TRANSIT_OLD_TASK_OPEN;}if (openingType == TYPE_ACTIVITY) {return TRANSIT_OLD_ACTIVITY_OPEN;}if (openingType == TYPE_TASK_FRAGMENT) {return TRANSIT_OLD_TASK_FRAGMENT_OPEN;}}if (appTransition.containsTransitRequest(TRANSIT_CLOSE)) {if (closingType == TYPE_TASK) {return TRANSIT_OLD_TASK_CLOSE;}if (closingType == TYPE_TASK_FRAGMENT) {return TRANSIT_OLD_TASK_FRAGMENT_CLOSE;}if (closingType == TYPE_ACTIVITY) {for (int i = closingApps.size() - 1; i >= 0; i--) {if (closingApps.valueAt(i).visibleIgnoringKeyguard) {return TRANSIT_OLD_ACTIVITY_CLOSE;}}// Skip close activity transition since no closing app can be visiblereturn WindowManager.TRANSIT_OLD_UNSET;}}if (appTransition.containsTransitRequest(TRANSIT_RELAUNCH)&& !openingWcs.isEmpty() && !openingApps.isEmpty()) {return TRANSIT_OLD_ACTIVITY_RELAUNCH;}return TRANSIT_OLD_NONE;}
加载和开始动画
getAnimationAdapter加载动画
首先遍历所有的windowContainer 调用applyAnimation
private void applyAnimations(ArraySet<WindowContainer> wcs, ArraySet<ActivityRecord> apps,@TransitionOldType int transit, boolean visible, LayoutParams animLp,boolean voiceInteraction) {final int wcsCount = wcs.size();for (int i = 0; i < wcsCount; i++) {final WindowContainer wc = wcs.valueAt(i);// If app transition animation target is promoted to higher level, SurfaceAnimator// triggers WC#onAnimationFinished only on the promoted target. So we need to take care// of triggering AR#onAnimationFinished on each ActivityRecord which is a part of the// app transition.final ArrayList<ActivityRecord> transitioningDescendants = new ArrayList<>();for (int j = 0; j < apps.size(); ++j) {final ActivityRecord app = apps.valueAt(j);if (app.isDescendantOf(wc)) {transitioningDescendants.add(app);}}wc.applyAnimation(animLp, transit, visible, voiceInteraction, transitioningDescendants);}}然后调用getAnimationAdapter 根据窗口层次结构中给定的窗口布局属性获取动画适配器
startAnimation 创建leash开始动画
SurfaceAnimation.java
166 void startAnimation(Transaction t, AnimationAdapter anim, boolean hidden,
167 @AnimationType int type,
168 @Nullable OnAnimationFinishedCallback animationFinishedCallback,
169 @Nullable Runnable animationCancelledCallback,
170 @Nullable AnimationAdapter snapshotAnim, @Nullable SurfaceFreezer freezer) {
171 cancelAnimation(t, true /* restarting */, true /* forwardCancel */);
172 mAnimation = anim;
173 mAnimationType = type;
174 mSurfaceAnimationFinishedCallback = animationFinishedCallback;
175 mAnimationCancelledCallback = animationCancelledCallback;
176 final SurfaceControl surface = mAnimatable.getSurfaceControl();
177 if (surface == null) {
178 Slog.w(TAG, "Unable to start animation, surface is null or no children.");
179 cancelAnimation();
180 return;
181 }
182 mLeash = freezer != null ? freezer.takeLeashForAnimation() : null;
183 if (mLeash == null) {
184 mLeash = createAnimationLeash(mAnimatable, surface, t, type,
185 mAnimatable.getSurfaceWidth(), mAnimatable.getSurfaceHeight(), 0 /* x */,
186 0 /* y */, hidden, mService.mTransactionFactory);
187 mAnimatable.onAnimationLeashCreated(t, mLeash);
188 }
189 mAnimatable.onLeashAnimationStarting(t, mLeash);
190 if (mAnimationStartDelayed) {
191 ProtoLog.i(WM_DEBUG_ANIM, "Animation start delayed for %s", mAnimatable);
192 return;
193 }
194 mAnimation.startAnimation(mLeash, t, type, mInnerAnimationFinishedCallback);
195 if (ProtoLogImpl.isEnabled(WM_DEBUG_ANIM)) {
196 StringWriter sw = new StringWriter();
197 PrintWriter pw = new PrintWriter(sw);
198 mAnimation.dump(pw, "");
199 ProtoLog.d(WM_DEBUG_ANIM, "Animation start for %s, anim=%s", mAnimatable, sw);
200 }
201 if (snapshotAnim != null) {
202 mSnapshot = freezer.takeSnapshotForAnimation();
203 if (mSnapshot == null) {
204 Slog.e(TAG, "No snapshot target to start animation on for " + mAnimatable);
205 return;
206 }
207 mSnapshot.startAnimation(t, snapshotAnim, type);
208 }
209 }可见创建一个SuefaceControl, 然后把 WindowContainer的surface挂在了leash上面, 然后对leash做动画
455 static SurfaceControl createAnimationLeash(Animatable animatable, SurfaceControl surface,
456 Transaction t, @AnimationType int type, int width, int height, int x, int y,
457 boolean hidden, Supplier<Transaction> transactionFactory) {
458 ProtoLog.i(WM_DEBUG_ANIM, "Reparenting to leash for %s", animatable);
459 final SurfaceControl.Builder builder = animatable.makeAnimationLeash()
460 .setParent(animatable.getAnimationLeashParent())
461 .setName(surface + " - animation-leash of " + animationTypeToString(type))
462 // TODO(b/151665759) Defer reparent calls
463 // We want the leash to be visible immediately because the transaction which shows
464 // the leash may be deferred but the reparent will not. This will cause the leashed
465 // surface to be invisible until the deferred transaction is applied. If this
466 // doesn't work, you will can see the 2/3 button nav bar flicker during seamless
467 // rotation.
468 .setHidden(hidden)
469 .setEffectLayer()
470 .setCallsite("SurfaceAnimator.createAnimationLeash");
471 final SurfaceControl leash = builder.build();
472 t.setWindowCrop(leash, width, height);
473 t.setPosition(leash, x, y);
474 t.show(leash);
475 t.setAlpha(leash, hidden ? 0 : 1);
476
477 t.reparent(surface, leash);
478 return leash;
479 }
SurfaceAnimationRunner.java171 void startAnimation(AnimationSpec a, SurfaceControl animationLeash, Transaction t,
172 Runnable finishCallback) {
173 synchronized (mLock) {
174 final RunningAnimation runningAnim = new RunningAnimation(a, animationLeash,
175 finishCallback);
176 boolean requiresEdgeExtension = requiresEdgeExtension(a);
177
178 if (requiresEdgeExtension) {
179 final ArrayList<SurfaceControl> extensionSurfaces = new ArrayList<>();
180 synchronized (mEdgeExtensionLock) {
181 mEdgeExtensions.put(animationLeash, extensionSurfaces);
182 }
183
184 mPreProcessingAnimations.put(animationLeash, runningAnim);
185
186 // We must wait for t to be committed since otherwise the leash doesn't have the
187 // windows we want to screenshot and extend as children.
188 t.addTransactionCommittedListener(mEdgeExtensionExecutor, () -> {
189 final WindowAnimationSpec animationSpec = a.asWindowAnimationSpec();
190
191 final Transaction edgeExtensionCreationTransaction = new Transaction();
192 edgeExtendWindow(animationLeash,
193 animationSpec.getRootTaskBounds(), animationSpec.getAnimation(),
194 edgeExtensionCreationTransaction);
195
196 synchronized (mLock) {
197 // only run if animation is not yet canceled by this point
198 if (mPreProcessingAnimations.get(animationLeash) == runningAnim) {
199 // In the case the animation is cancelled, edge extensions are removed
200 // onAnimationLeashLost which is called before onAnimationCancelled.
201 // So we need to check if the edge extensions have already been removed
202 // or not, and if so we don't want to apply the transaction.
203 synchronized (mEdgeExtensionLock) {
204 if (!mEdgeExtensions.isEmpty()) {
205 edgeExtensionCreationTransaction.apply();
206 }
207 }
208
209 mPreProcessingAnimations.remove(animationLeash);
210 mPendingAnimations.put(animationLeash, runningAnim);
211 if (!mAnimationStartDeferred && mPreProcessingAnimations.isEmpty()) {
212 mChoreographer.postFrameCallback(this::startAnimations);
213 }
214 }
215 }
216 });
217 }
218
219 if (!requiresEdgeExtension) {
220 mPendingAnimations.put(animationLeash, runningAnim);
221 if (!mAnimationStartDeferred && mPreProcessingAnimations.isEmpty()) {
222 mChoreographer.postFrameCallback(this::startAnimations);
223 }
224 }
225
226 // Some animations (e.g. move animations) require the initial transform to be
227 // applied immediately.
228 applyTransformation(runningAnim, t, 0 /* currentPlayTime */);
229 }
230 }发送消息
scheduleFrameLocked:862, Choreographer (android.view)
postCallbackDelayedInternal:605, Choreographer (android.view)
postFrameCallbackDelayed:702, Choreographer (android.view)
postFrameCallback:682, Choreographer (android.view)
continueStartingAnimations:173, SurfaceAnimationRunner (com.android.server.wm)
handleAppTransitionReady:312, AppTransitionController (com.android.server.wm)
checkAppTransitionReady:1070, RootWindowContainer (com.android.server.wm)
performSurfacePlacementNoTrace:937, RootWindowContainer (com.android.server.wm)
performSurfacePlacement:877, RootWindowContainer (com.android.server.wm)
performSurfacePlacementLoop:199, WindowSurfacePlacer (com.android.server.wm)
performSurfacePlacement:148, WindowSurfacePlacer (com.android.server.wm)
performSurfacePlacement:137, WindowSurfacePlacer (com.android.server.wm)
handleAppTransitionTimeout:1814, AppTransition (com.android.server.wm)
lambda$new$0$com-android-server-wm-AppTransition:243, AppTransition (com.android.server.wm)
run:-1, AppTransition$$ExternalSyntheticLambda3 (com.android.server.wm)
handleCallback:942, Handler (android.os)
dispatchMessage:99, Handler (android.os)
loopOnce:211, Looper (android.os)
loop:300, Looper (android.os)
run:67, HandlerThread (android.os)
run:46, ServiceThread (com.android.server)为动画添加listener
SurfaceAnimationRunner.javaprivate void startAnimationLocked(RunningAnimation a) {
270 final ValueAnimator anim = mAnimatorFactory.makeAnimator();
271
272 // Animation length is already expected to be scaled.
273 anim.overrideDurationScale(1.0f);
274 anim.setDuration(a.mAnimSpec.getDuration());
275 anim.addUpdateListener(animation -> {
276 synchronized (mCancelLock) {
277 if (!a.mCancelled) {
278 final long duration = anim.getDuration();
279 long currentPlayTime = anim.getCurrentPlayTime();
280 if (currentPlayTime > duration) {
281 currentPlayTime = duration;
282 }
283 applyTransformation(a, mFrameTransaction, currentPlayTime);
284 }
285 }
286
287 // Transaction will be applied in the commit phase.
288 scheduleApplyTransaction();
289 });
290
291 anim.addListener(new AnimatorListenerAdapter() {
292 @Override
293 public void onAnimationStart(Animator animation) {
294 synchronized (mCancelLock) {
295 if (!a.mCancelled) {
296 // TODO: change this back to use show instead of alpha when b/138459974 is
297 // fixed.
298 mFrameTransaction.setAlpha(a.mLeash, 1);
299 }
300 }
301 }
302
303 @Override
304 public void onAnimationEnd(Animator animation) {
305 synchronized (mLock) {
306 mRunningAnimations.remove(a.mLeash);
307 synchronized (mCancelLock) {
308 if (!a.mCancelled) {
309
310 // Post on other thread that we can push final state without jank.
311 mAnimationThreadHandler.post(a.mFinishCallback);
312 }
313 }
314 }
315 }
316 });
317 a.mAnim = anim;
318 mRunningAnimations.put(a.mLeash, a);
319
320 anim.start();
321 if (a.mAnimSpec.canSkipFirstFrame()) {
322 // If we can skip the first frame, we start one frame later.
323 anim.setCurrentPlayTime(mChoreographer.getFrameIntervalNanos() / NANOS_PER_MS);
324 }
325
326 // Immediately start the animation by manually applying an animation frame. Otherwise, the
327 // start time would only be set in the next frame, leading to a delay.
328 anim.doAnimationFrame(mChoreographer.getFrameTime());
329 }
330
doFrame时更新动画位置
放vsync到来后, 执行onAnimationUpdate
private void applyTransformation(RunningAnimation a, Transaction t, long currentPlayTime) {a.mAnimSpec.apply(t, a.mLeash, currentPlayTime);}再来看下apply方法的具体实现，通过之前以具体xml资源创建的mAnimation对象，根据当前时间片currentPlayTime获取到当前的tmp.transformation，对leash对象实现了Matrix（大小，位置），Alpha，Crop等transformation变化，再通过Transaction 交给surfaceflinger显示，从而实现了动画当前时间片的显示效果。对比旧动画机制，这个transformation变化是在WindowStateAnimator类里面实现的。为什么要重点关注这个方法呢？因为如果窗口动画出bug了（位置大小不对？透明度异常？），就可以在这个方法里面打印window的相关参数来初步定位原因。
119 @Override
120 public void apply(Transaction t, SurfaceControl leash, long currentPlayTime) {
121 final TmpValues tmp = mThreadLocalTmps.get();
122 tmp.transformation.clear();
123 mAnimation.getTransformation(currentPlayTime, tmp.transformation);
124 tmp.transformation.getMatrix().postTranslate(mPosition.x, mPosition.y);
125 t.setMatrix(leash, tmp.transformation.getMatrix(), tmp.floats);
126 t.setAlpha(leash, tmp.transformation.getAlpha());
127
128 boolean cropSet = false;
129 if (mRootTaskClipMode == ROOT_TASK_CLIP_NONE) {
130 if (tmp.transformation.hasClipRect()) {
131 final Rect clipRect = tmp.transformation.getClipRect();
132 accountForExtension(tmp.transformation, clipRect);
133 t.setWindowCrop(leash, clipRect);
134 cropSet = true;
135 }
136 } else {
137 mTmpRect.set(mRootTaskBounds);
138 if (tmp.transformation.hasClipRect()) {
139 mTmpRect.intersect(tmp.transformation.getClipRect());
140 }
141 accountForExtension(tmp.transformation, mTmpRect);
142 t.setWindowCrop(leash, mTmpRect);
143 cropSet = true;
144 }
145
146 // We can only apply rounded corner if a crop is set, as otherwise the value is meaningless,
147 // since it doesn't have anything it's relative to.
148 if (cropSet && mAnimation.hasRoundedCorners() && mWindowCornerRadius > 0) {
149 t.setCornerRadius(leash, mWindowCornerRadius);
150 }
151 }6、ValueAnimator类，从上面的介绍可以得知，窗口动画的最终本质就是一个ValueAnimator属性动画，理解了这一点，就相当于把窗口动画简单化了，最终的实现就类比于我们普通app的属性动画的实现（app属性动画的对象是view，窗口属性动画的对象是window），只不过整个流程比较复杂而已，但是最终的实现原理是一样的，殊途同归，这个才是android窗口动画机制的精髓所在
Rotation动画 ANIMATION_TYPE_SCREEN_ROTATION
1. 根据sensor导致的旋转动画
最终也会到SurfaceAnimation
拿到动画适配器:
FadeAnimationController.javapublic void fadeWindowToken(boolean show, WindowToken windowToken, int animationType) {if (windowToken == null || windowToken.getParent() == null) {return;}final Animation animation = show ? getFadeInAnimation() : getFadeOutAnimation();final FadeAnimationAdapter animationAdapter = animation != null? createAdapter(createAnimationSpec(animation), show, windowToken) : null;if (animationAdapter == null) {return;}windowToken.startAnimation(windowToken.getPendingTransaction(), animationAdapter,show /* hidden */, animationType, null /* finishedCallback */);}
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