app/src/main/java/com/example/oplogy/MainActivity.java

@@ -135,6 +135,7 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
             startActivity(toSubmission);
         }
     }
+
     //UUIDを表示するかのダイアログ
     private void showUUIDYesNoDialog() {
         AlertDialog.Builder builder = new AlertDialog.Builder(this); // この 'this' が問題でないか確認
@@ -159,6 +160,7 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
         alertDialog.show();
 
     }
+
     //ルート作成の非同期処理
     private void fetchDataAndCreateRoute() {
         //非同期処理の開始
@@ -205,7 +207,7 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
             if (notDuplicates) {
                 Log.d("MainActivity", "スケジュール作成成功");
             } else {
-                showErrorDialog(latch);
+                showErrorDialog(latch, myDataList);
             }
         });
 
@@ -223,6 +225,7 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
 
         executor.shutdown();
     }
+
     //ルート作成のダイアログ
     private void showRouteCreationDialog(CountDownLatch latch) {
         new AlertDialog.Builder(MainActivity.this)
@@ -242,11 +245,24 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
                 })
                 .show();
     }
-    public void showErrorDialog(CountDownLatch latch) {
 
+    public void showErrorDialog(CountDownLatch latch, List<MyDataClass> myDataList) {
+        List<Integer> studentNumbers = new ArrayList<>();
+        for (int i = 0; i < myDataList.size(); i++) {
+            if (myDataList.get(i).getSchedule() == 0) {
+                studentNumbers.add(myDataList.get(i).getStudentNumber());
+            }
+        }
+        StringBuilder message = new StringBuilder("保護者の重複が重大でルート作成ができません。調整してください。\n出席番号: ");
+        for (int i = 0; i < studentNumbers.size(); i++) {
+            message.append(studentNumbers.get(i));
+            if (i < studentNumbers.size() - 1) {
+                message.append(", ");
+            }
+        }
         new AlertDialog.Builder(MainActivity.this)
                 .setTitle("警告")
-                .setMessage("保護者の重複が重大でルート作成ができません。調整してください")
+                .setMessage(message.toString())
                 .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialog, int which) {