Add logging in ReactInstanceManager.onHostPause when activity is inco…

…rrectly null (#48226)

Summary:
Pull Request resolved: #48226

Adding logging to onHostPause to help diagnose cases when the activity is incorrectly null.

Reviewed By: fkgozali

Differential Revision: D67123351

fbshipit-source-id: f694a3a89e4584776050f6bca2f33f2805528d4b

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactInstanceManager.java

@@ -651,6 +651,16 @@ public void onUserLeaveHint(@Nullable Activity activity) {
   @ThreadConfined(UI)
   public void onHostPause(@Nullable Activity activity) {
     if (mRequireActivity) {
+      if (mCurrentActivity == null) {
+        String message =
+            "ReactInstanceManager.onHostPause called with null activity, expected:"
+                + mCurrentActivity.getClass().getSimpleName();
+        FLog.e(TAG, message);
+        StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
+        for (StackTraceElement element : stackTrace) {
+          FLog.e(TAG, element.toString());
+        }
+      }
       Assertions.assertCondition(mCurrentActivity != null);
     }
     if (mCurrentActivity != null) {