Making AsyncClockEventDelegate a singleton

RemoteViews can get inflated after the activity is destroyed during
async inflation. This can cause the delegate to loose the destroy event.

Bug: 303686041
Test: Presubmit
Flag: N/A
Change-Id: Iecb9d69d95b2c924e1189ac15515fac327d8f44d

quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java

@@ -218,8 +218,6 @@ public class QuickstepLauncher extends Launcher {
     private SplitWithKeyboardShortcutController mSplitWithKeyboardShortcutController;
     private SplitToWorkspaceController mSplitToWorkspaceController;
 
-    private AsyncClockEventDelegate mAsyncClockEventDelegate;
-
     /**
      * If Launcher restarted while in the middle of an Overview split select, it needs this data to
      * recover. In all other cases this will remain null.
@@ -497,10 +495,6 @@ public class QuickstepLauncher extends Launcher {
             mSplitSelectStateController.onDestroy();
         }
 
-        if (mAsyncClockEventDelegate != null) {
-            mAsyncClockEventDelegate.onDestroy();
-        }
-
         super.onDestroy();
         mHotseatPredictionController.destroy();
         mSplitWithKeyboardShortcutController.onDestroy();
@@ -1346,18 +1340,12 @@ public class QuickstepLauncher extends Launcher {
         switch (name) {
             case "TextClock", "android.widget.TextClock" -> {
                 TextClock tc = new TextClock(context, attrs);
-                if (mAsyncClockEventDelegate == null) {
-                    mAsyncClockEventDelegate = new AsyncClockEventDelegate(this);
-                }
-                tc.setClockEventDelegate(mAsyncClockEventDelegate);
+                tc.setClockEventDelegate(AsyncClockEventDelegate.INSTANCE.get(this));
                 return tc;
             }
             case "AnalogClock", "android.widget.AnalogClock" -> {
                 AnalogClock ac = new AnalogClock(context, attrs);
-                if (mAsyncClockEventDelegate == null) {
-                    mAsyncClockEventDelegate = new AsyncClockEventDelegate(this);
-                }
-                ac.setClockEventDelegate(mAsyncClockEventDelegate);
+                ac.setClockEventDelegate(AsyncClockEventDelegate.INSTANCE.get(this));
                 return ac;
             }
         }