Update

app/src/main/java/com/yono/messeripos/LoginActivity.java

@@ -75,7 +75,7 @@ public class LoginActivity extends AppCompatActivity {
                         public void onChanged(DataResponse<UsersModels> usersModelsDataResponse) {
                             Log.d("Status", usersModelsDataResponse.getMessageData());
 
-                            if (!usersModelsDataResponse.getMessageData().equals("Login Failed")){
+                            if (usersModelsDataResponse.getStatusData()){
                                 SharedPreferences.Editor editor = sharedPreferences.edit();
                                 editor.putBoolean(SplashScreen.SESSION, true);
                                 editor.commit();

app/src/main/java/com/yono/messeripos/MainActivity.java

@@ -116,7 +116,7 @@ public class MainActivity extends AppCompatActivity {
         toolbar = findViewById(R.id.topAppBar);
         mainViewModels = ViewModelProviders.of(this).get(MainViewModels.class);
 
-        if (orderId.isEmpty())
+        if (sharedPreferences.getString(ORDER_ID,"").isEmpty())
         {
             SharedPreferences.Editor editor = sharedPreferences.edit();
             editor.putString(ORDER_ID,"MES-ORDER"+utils.timeStamp());
@@ -307,13 +307,13 @@ public class MainActivity extends AppCompatActivity {
 
             @Override
             public void onAddCart(ProductModels product) {
-                mainViewModelsCart.checkOrderProduct(product.getIdProduct(), orderId).observe(MainActivity.this, new Observer<List<ProductCartModels>>() {
+                mainViewModelsCart.checkOrderProduct(product.getIdProduct(), sharedPreferences.getString(ORDER_ID,"")).observe(MainActivity.this, new Observer<List<ProductCartModels>>() {
                     @RequiresApi(api = Build.VERSION_CODES.N)
                     @Override
                     public void onChanged(List<ProductCartModels> productCartModels) {
                         if (productCartModels.isEmpty() && cartIsEmpty){
                             mainViewModelsCart.insertCart(new ProductCartModels(
-                                    orderId,
+                                    sharedPreferences.getString(ORDER_ID,""),
                                     1,
                                     product.getIdProduct(),
                                     product.getProductName(),