Method onCancelled

packages/firebase-database/index.android.ts:215–218

(param0: com.google.firebase.database.DatabaseError)

						callback?.(DataSnapshot.fromNative(param0), null);
					},
					onCancelled(param0: com.google.firebase.database.DatabaseError) {
						const err = FirebaseError.fromNative(param0);
						cancelCallbackOrContext?.(err);
					},
				})
			);
		} else {