Don't play transitions if keyguard didn't register

This could happen:

  (a) if something went wrong in early setup
  (b) if SysUI crashed and received transitions while restarting

Bug: 302538471
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:8a20c08f0db20b3461903ecd387bd63b5dd7f149)
Merged-In: Iff0f1c4af9e1da96b7bbd04bd45da9f5330fd9b1
Change-Id: Iff0f1c4af9e1da96b7bbd04bd45da9f5330fd9b1

1 files changed, 7 insertions, 1 deletions

diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/keyguard/KeyguardTransitionHandler.java b/libs/WindowManager/Shell/src/com/android/wm/shell/keyguard/KeyguardTransitionHandler.java
index b71c48e16acb..53b5bd7ceb94 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/keyguard/KeyguardTransitionHandler.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/keyguard/KeyguardTransitionHandler.java
@@ -159,9 +159,15 @@ public class KeyguardTransitionHandler implements Transitions.TransitionHandler
             @NonNull SurfaceControl.Transaction startTransaction,
             @NonNull SurfaceControl.Transaction finishTransaction,
             @NonNull TransitionFinishCallback finishCallback) {
+
+        if (remoteHandler == null) {
+            ProtoLog.e(ShellProtoLogGroup.WM_SHELL_TRANSITIONS,
+                    "missing handler for keyguard %s transition", description);
+            return false;
+        }
+
         ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TRANSITIONS,
                 "start keyguard %s transition, info = %s", description, info);
-
         try {
             mStartedTransitions.put(transition,
                     new StartedTransition(info, finishTransaction, remoteHandler));