Android : SelectedListener Classe et menu

Une fois, on sélectionne une classe de menu, on remplit le spinner menu , au choix d'un menu, on affiche la liste des plats.

1.Layout

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="3dp"
android:background="#FFEB3B">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#CDDC39"
android:layout_weight="3.6">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#FCFDFC"
android:layout_marginBottom="5dp">
<TextView
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_weight="1"
android:text="Classe"
android:textSize="25dp"/>
<Spinner
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_weight="1"
android:id="@+id/spinnerClasse"
android:textSize="200dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#FCFDFC"
android:layout_marginBottom="5dp">
<TextView
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_weight="1"
android:text="Menu"
android:textSize="25dp"/>
<Spinner
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_weight="1"
android:id="@+id/spinnerMenu"
android:textSize="200dp"/>
</LinearLayout>
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="4"
android:text="Liste Plats"
android:textSize="25dp"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#8BC34A"
android:layout_weight="1"
android:paddingTop="8dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#fff"
android:textSize="20dp"
android:text="Nom "/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20dp"
android:background="#fff"
android:layout_marginTop="2dp"
android:id="@+id/listePlats"/>
</LinearLayout>
</LinearLayout>

2.Java

public class MenuClasse extends AppCompatActivity implements AdapterView.OnItemSelectedListener{
    Spinner spinnerClasse,spinnerMenu;
    TextView listePlats;
    String []classes={"Classe1","Classe2","Classe3"};
    String [][]menus={
            {"Menu 1 Classe1","Menu 2 Classe1","Menu 3 Classe1"},
            {"Menu 1 Classe2","Menu 2 Classe2","Menu 3 Classe2"},
            {"Menu 1 Classe3","Menu 2 Classe3","Menu 3 Classe3"}
    };
    
    int classeChosi=0;
    int menuChoisi=0;
    String []plats={
            "C1 M1 plat1 \n C1 M1 plat2 ",
            "C1 M2 plat1 \n C1 M2 plat2 ",
            "C1 M3 plat1 \n C1 M3 plat2 ",
                    "C2 M1 plat1 \n C2 M1 plat2 ",
                    "C2 M2 plat1 \n C2 M2 plat2 ",
                    "C2 M3 plat1 \n C2 M3 plat2 ",
    
                    "C3 M1 plat1 \n C3 M1 plat2 ",
                    "C3 M2 plat1 \n C3 M2 plat2 ",
                    "C3 M3 plat1 \n C3 M3 plat2 ",
        };
    
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_menu_classe);
            //1.la liaison entre les objet java et les objets graphique
            spinnerClasse=findViewById(R.id.spinnerClasse);
            spinnerMenu=findViewById(R.id.spinnerMenu);
            listePlats=findViewById(R.id.listePlats);
    
            //2.ecouter les objets cliquables
            spinnerClasse.setOnItemSelectedListener(this);
            spinnerMenu.setOnItemSelectedListener(this);
    
            //3.Remplir le spinner
            ArrayAdapter<String>adpater1=new ArrayAdapter<>(this,R.layout.support_simple_spinner_dropdown_item,classes);
            spinnerClasse.setAdapter(adpater1);
    
    
    
    
    
        }
    
        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
         if(adapterView.getId()==spinnerClasse.getId())
         {
             int positionClass=spinnerClasse.getSelectedItemPosition();
             classeChosi=positionClass;
             String[] selectedMenu=new String[3];
             selectedMenu[0]=menus[positionClass][0];
             selectedMenu[1]=menus[positionClass][1];
             selectedMenu[2]=menus[positionClass][2];
    
             ArrayAdapter<String>adapter2=new ArrayAdapter<>(this,R.layout.support_simple_spinner_dropdown_item,selectedMenu);
             spinnerMenu.setAdapter(adapter2);
         }
    
            if(adapterView.getId()==spinnerMenu.getId()) {
                int positionMenu = spinnerMenu.getSelectedItemPosition();
                String menuChosi=spinnerMenu.getSelectedItem().toString();
                menuChoisi=positionMenu;
              String monPlats=plats[3*classeChosi+menuChoisi];
                listePlats.setText(monPlats);
            }
        }
    
        @Override
        public void onNothingSelected(AdapterView<?> adapterView) {
    
        }
    }