More Improvements!

app/build.gradle.kts

@@ -32,7 +32,6 @@ android {
 dependencies {
     implementation("androidx.appcompat:appcompat:1.6.1")
     implementation("com.google.android.material:material:1.11.0")
-    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
     // OkHttp (For HTTP)
     implementation("com.squareup.okhttp3:okhttp:4.12.0")
     // Moshi (For JSON)

app/src/main/java/com/thebrokenrail/mtudining/activity/list/ListActivity.java

@@ -36,6 +36,7 @@ public class ListActivity extends AppCompatActivity {
 
         // Setup RecyclerView
         adapter = new ListAdapter(viewModel.task);
+        viewModel.task.sendDataToListeners();
         RecyclerView recyclerView = findViewById(R.id.recycler_view);
         recyclerView.setLayoutManager(new LinearLayoutManager(this));
         recyclerView.setAdapter(adapter);

app/src/main/java/com/thebrokenrail/mtudining/activity/menu/ItemDialog.java

@@ -61,7 +61,9 @@ public class ItemDialog {
             message.append("\n\n");
         }
         message.append(context.getString(R.string.portion), new StyleSpan(Typeface.BOLD), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
-        message.append(item.portion);
+        if (item.portion != null) {
+            message.append(item.portion);
+        }
         message.append('\n');
         message.append(context.getString(R.string.ingredients), new StyleSpan(Typeface.BOLD), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
         if (item.ingredients != null) {

app/src/main/java/com/thebrokenrail/mtudining/activity/menu/MenuActivity.java

@@ -61,15 +61,14 @@ public class MenuActivity extends AppCompatActivity {
         String name = getIntent().getStringExtra(NAME_EXTRA);
         toolbar.setTitle(name);
         String id = getIntent().getStringExtra(ID_EXTRA);
-        if (!viewModel.task.isSetup()) {
+        viewModel.task.setup(id);
-            viewModel.task.setup(id, new Date());
-        }
         latitude = getIntent().getDoubleExtra(LATITUDE_EXTRA, 0);
         longitude = getIntent().getDoubleExtra(LONGITUDE_EXTRA, 0);
         street = getIntent().getStringExtra(STREET_EXTRA);
 
         // Setup RecyclerView
-        adapter = new MenuAdapter(viewModel.task);
+        adapter = new MenuAdapter(viewModel.task, viewModel.state);
+        viewModel.task.sendDataToListeners();
         RecyclerView recyclerView = findViewById(R.id.recycler_view);
         recyclerView.setLayoutManager(new LinearLayoutManager(this));
         recyclerView.setAdapter(adapter);
@@ -113,7 +112,7 @@ public class MenuActivity extends AppCompatActivity {
      * @param newDate New date
      */
     public void updateDate(Date newDate) {
-        viewModel.task.setup(null, newDate);
+        viewModel.state.setDate(newDate);
         viewModel.task.start();
     }
 

app/src/main/java/com/thebrokenrail/mtudining/activity/menu/MenuAdapter.java

@@ -24,8 +24,14 @@ import java.util.Date;
  * Adapter for listing dining halls.
  */
 class MenuAdapter extends TaskAdapter<MenuData> {
-    MenuAdapter(Task<MenuData> task) {
+    /**
+     * Current state.
+     */
+    private final MenuState state;
+
+    MenuAdapter(Task<MenuData> task, MenuState state) {
         super(task);
+        this.state = state;
     }
 
     @Override
@@ -43,8 +49,9 @@ class MenuAdapter extends TaskAdapter<MenuData> {
      */
     private MenuData.Meal getMeal() {
         if (getResult() != null) {
+            String selectedMeal = state.getSelectedMeal();
             for (MenuData.Meal meal : getResult().meals) {
-                if (meal.name.equals(getResult().selectedMeal)) {
+                if (meal.name.equals(selectedMeal)) {
                     // Found Meal
                     return meal;
                 }
@@ -93,8 +100,7 @@ class MenuAdapter extends TaskAdapter<MenuData> {
         // Set Date
         CustomDropDownView dateField = view.findViewById(R.id.menu_date_field);
         MaterialAutoCompleteTextView date = view.findViewById(R.id.menu_date);
-        // Retrieve from Task as this must show even when result is not available.
+        Date current = state.getDate();
-        Date current = ((MenuTask) getTask()).getDate();
         date.setText(DateUtil.toString(current));
         // Handle Click
         dateField.setup();
@@ -104,26 +110,28 @@ class MenuAdapter extends TaskAdapter<MenuData> {
         });
 
         // Set Meal
-        boolean hasMeal = getResult() != null;
+        boolean isLoaded = getResult() != null;
         TextInputLayout mealField = view.findViewById(R.id.menu_meal_field);
         MaterialAutoCompleteTextView meal = view.findViewById(R.id.menu_meal);
-        if (hasMeal) {
+        if (isLoaded) {
             // Enable/Disable Field
-            hasMeal = getResult().meals.size() > 0;
+            isLoaded = getResult().meals.size() > 0;
-            mealField.setEnabled(hasMeal);
+            mealField.setEnabled(isLoaded);
-            if (hasMeal) {
+            if (isLoaded) {
                 // Set Dropdown Options
                 meal.setSimpleItems(getResult().meals.stream().map(x -> x.name).toArray(String[]::new));
                 // Set Selection
-                meal.setText(getResult().selectedMeal, false);
+                meal.setText(state.getSelectedMeal(), false);
                 // Handle Meal Selection
                 meal.setOnItemClickListener((parent, view1, position, id) -> {
                     // Get New Meal
                     String newMeal = (String) parent.getAdapter().getItem(position);
                     // Update UI
-                    int oldItemCount = getItemCount();
+                    if (!newMeal.equals(state.getSelectedMeal())) {
-                    getResult().selectedMeal = newMeal;
+                        int oldItemCount = getItemCount();
-                    reloadUI(oldItemCount);
+                        state.setSelectedMeal(newMeal);
+                        reloadUI(oldItemCount);
+                    }
                 });
             } else {
                 // Show N/A

app/src/main/java/com/thebrokenrail/mtudining/activity/menu/MenuData.java

@@ -17,8 +17,5 @@ class MenuData {
             this.name = name;
         }
     }
-
     public final List<Meal> meals = new ArrayList<>();
-    // This may be changed at runtime.
-    public String selectedMeal = null;
 }

app/src/main/java/com/thebrokenrail/mtudining/activity/menu/MenuState.java

@@ -0,0 +1,61 @@
+package com.thebrokenrail.mtudining.activity.menu;
+
+import androidx.lifecycle.SavedStateHandle;
+
+import java.util.Date;
+
+/**
+ * Current state of menu screen.
+ */
+public class MenuState {
+    private static final String DATE_KEY = "date";
+    private static final String SELECTED_MEAL_KEY = "selected_meal";
+
+    /**
+     * Data that should survive process-death.
+     */
+    private final SavedStateHandle savedStateHandle;
+
+    public MenuState(SavedStateHandle savedStateHandle) {
+        this.savedStateHandle = savedStateHandle;
+        if (!savedStateHandle.contains(DATE_KEY)) {
+            setDate(new Date());
+        }
+        if (!savedStateHandle.contains(SELECTED_MEAL_KEY)) {
+            setSelectedMeal("");
+        }
+    }
+
+    /**
+     * Get currently selected date.
+     * @return The data
+     */
+    @SuppressWarnings({"DataFlowIssue"})
+    public Date getDate() {
+        return new Date((long) savedStateHandle.get(DATE_KEY));
+    }
+
+    /**
+     * Set selected date.
+     * @param date The new date
+     */
+    public void setDate(Date date) {
+        savedStateHandle.set(DATE_KEY, date.getTime());
+    }
+
+    /**
+     * Get currently selected meal.
+     * @return The meal
+     */
+    public String getSelectedMeal() {
+        return savedStateHandle.get(SELECTED_MEAL_KEY);
+    }
+
+    /**
+     * Set selected meal.
+     * @param selectedMeal The new meal
+     */
+    public void setSelectedMeal(String selectedMeal) {
+        savedStateHandle.set(SELECTED_MEAL_KEY, selectedMeal);
+    }
+}

app/src/main/java/com/thebrokenrail/mtudining/activity/menu/MenuTask.java

@@ -8,7 +8,6 @@ import com.thebrokenrail.mtudining.util.Category;
 import com.thebrokenrail.mtudining.util.Constants;
 
 import java.util.Comparator;
-import java.util.Date;
 
 /**
  * Task for loading menu information.
@@ -17,44 +16,25 @@ public class MenuTask extends Task<MenuData> {
     private final Connection connection;
 
     private String locationId;
-    private Date date;
+    private final MenuState state;
 
-    public MenuTask(Connection connection) {
+    public MenuTask(Connection connection, MenuState state) {
         this.connection = connection;
+        this.state = state;
     }
 
     /**
      * Setup task.
-     * @param locationId Location ID (or null to use existing)
+     * @param locationId Location ID
-     * @param date Date
      */
-    void setup(String locationId, Date date) {
+    void setup(String locationId) {
-        if (locationId != null) {
+        this.locationId = locationId;
-            this.locationId = locationId;
-        }
-        this.date = date;
-    }
-
-    /**
-     * Check if task is setup.
-     * @return If the task is setup
-     */
-    boolean isSetup() {
-        return locationId != null;
-    }
-
-    /**
-     * Get date.
-     * @return The date
-     */
-    public Date getDate() {
-        return date;
     }
 
     @Override
     protected void startImpl(long id) {
         // Get Periods
-        Periods periods = new Periods(Constants.PLATFORM, locationId, date);
+        Periods periods = new Periods(Constants.PLATFORM, locationId, state.getDate());
         connection.send(periods, periodsResponse -> {
             // Loaded Periods
 
@@ -69,7 +49,7 @@ public class MenuTask extends Task<MenuData> {
                 for (Periods.Response.Period period : periodsResponse.periods) {
                     // Load Period Details
                     MenuData.Meal meal = new MenuData.Meal(period.id, period.name);
-                    PeriodDetail periodDetail = new PeriodDetail(Constants.PLATFORM, locationId, date, period.id);
+                    PeriodDetail periodDetail = new PeriodDetail(Constants.PLATFORM, locationId, state.getDate(), period.id);
                     connection.send(periodDetail, periodDetailResponse -> {
                         // Loaded Period Details
 
@@ -104,8 +84,6 @@ public class MenuTask extends Task<MenuData> {
                     });
                     data.meals.add(meal);
                 }
-                // Set Selected Meal
-                data.selectedMeal = data.meals.get(0).name;
             } else {
                 // No Periods To Load
                 done(id, data);
@@ -115,4 +93,29 @@ public class MenuTask extends Task<MenuData> {
             done(id, null);
         });
     }
+
+    @Override
+    protected void done(long id, MenuData obj) {
+        // Update Selected Meal If Needed
+        if (obj != null && obj.meals.size() > 0) {
+            boolean currentSelectedMealIsValid = false;
+            String selectedMeal = state.getSelectedMeal();
+            if (selectedMeal != null) {
+                // Check If Current Selection Is Valid
+                for (MenuData.Meal meal : obj.meals) {
+                    if (selectedMeal.equals(meal.name)) {
+                        currentSelectedMealIsValid = true;
+                        break;
+                    }
+                }
+            }
+            if (!currentSelectedMealIsValid) {
+                // Current Selection Is Invalid, Change It
+                state.setSelectedMeal(obj.meals.get(0).name);
+            }
+        }
+
+        // Call Parent
+        super.done(id, obj);
+    }
 }

app/src/main/java/com/thebrokenrail/mtudining/activity/menu/MenuViewModel.java

@@ -1,8 +1,8 @@
 package com.thebrokenrail.mtudining.activity.menu;
 
+import androidx.lifecycle.SavedStateHandle;
 import androidx.lifecycle.ViewModel;
 
-import com.thebrokenrail.mtudining.activity.task.Task;
 import com.thebrokenrail.mtudining.api.Connection;
 
 /**
@@ -10,5 +10,11 @@ import com.thebrokenrail.mtudining.api.Connection;
  */
 public class MenuViewModel extends ViewModel {
     private final Connection connection = new Connection();
-    public final MenuTask task = new MenuTask(connection);
+    public final MenuState state;
+    public final MenuTask task;
+
+    public MenuViewModel(SavedStateHandle savedStateHandle) {
+        state = new MenuState(savedStateHandle);
+        task = new MenuTask(connection, state);
+    }
 }

app/src/main/java/com/thebrokenrail/mtudining/activity/task/Task.java

@@ -29,6 +29,7 @@ public abstract class Task<E> {
     public void start() {
         lastStart = System.currentTimeMillis();
         status = Status.IN_PROGRESS;
+        result = null;
         startImpl(lastStart);
         // Update Listeners
         sendDataToListeners();
@@ -95,25 +96,15 @@ public abstract class Task<E> {
     public void addListener(Listener<E> listener) {
         if (!listeners.contains(listener)) {
             listeners.add(listener);
-            // Send Data
-            sendDataToListener(listener);
         }
     }
 
-    /**
-     * Send data to specific listener.
-     * @param listener The listener
-     */
-    private void sendDataToListener(Listener<E> listener) {
-        listener.update(status, status == Status.DONE ? result : null);
-    }
-
     /**
      * Send data to all listeners.
      */
-    private void sendDataToListeners() {
+    public void sendDataToListeners() {
         for (Listener<E> listener : listeners) {
-            sendDataToListener(listener);
+            listener.update(status, status == Status.DONE ? result : null);
         }
     }
 

app/src/main/java/com/thebrokenrail/mtudining/activity/task/TaskAdapter.java

@@ -208,12 +208,4 @@ public abstract class TaskAdapter<E> extends RecyclerView.Adapter<RecyclerView.V
         // Add Items
         notifyItemRangeInserted(1, getItemCount() - 1);
     }
-
-    /**
-     * Get task.
-     * @return The task
-     */
-    public Task<E> getTask() {
-        return task;
-    }
 }