fix

app/src/main/java/com/example/childguard/TestService.java

@@ -65,13 +65,16 @@ public class TestService extends Service {
 
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
+        this.userId = getSharedPreferences("app_situation", MODE_PRIVATE).getString("ID", null);
         if (getSharedPreferences("app_situation", MODE_PRIVATE).getString("ID", null) == null) {
             Log.d("onResume", "ID not initialized.");
             return flags; // IDが初期化されていない場合は何もしない
         }
+
         setSnapshotListener(FirebaseFirestore.getInstance().document("status/" + this.userId));
 
         if (isNotBluetoothGranted()) return flags;
+
         registerReceiver(receiver);
         return flags;
     }