Add progress bar and empty message to shopping list

app/app/src/main/java/tech/mercantec/easyeat/ui/shopping_list/ShoppingListFragment.kt

@@ -1,7 +1,6 @@
 package tech.mercantec.easyeat.ui.shopping_list
 
 import android.app.AlertDialog
-import android.app.Dialog
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
@@ -19,26 +18,22 @@ import tech.mercantec.easyeat.helpers.addShoppingItem
 import tech.mercantec.easyeat.helpers.deleteShoppingItem
 import tech.mercantec.easyeat.helpers.getShoppingList
 import tech.mercantec.easyeat.helpers.toggleShoppingItemChecked
-import tech.mercantec.easyeat.models.Dish
 import tech.mercantec.easyeat.models.ShoppingListItem
 import java.util.ArrayList
 import kotlin.concurrent.thread
 
 class ShoppingListFragment : Fragment() {
-
-    private var _binding: FragmentShoppingListBinding? = null
-
-    // This property is only valid between onCreateView and
-    // onDestroyView.
-    private val binding get() = _binding!!
-
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View {
-        _binding = FragmentShoppingListBinding.inflate(inflater, container, false)
-        val root: View = binding.root
+        val binding = FragmentShoppingListBinding.inflate(inflater, container, false)
+
+        binding.shoppingList.visibility = View.GONE
+        binding.emptyShoppingList.visibility = View.GONE
+        binding.addToShoppingList.visibility = View.GONE
+        binding.loading.visibility = View.VISIBLE
 
         // Fetch shopping list items
         thread {
@@ -48,12 +43,20 @@ class ShoppingListFragment : Fragment() {
             } catch (e: ApiRequestException) {
                 activity?.runOnUiThread {
                     Toast.makeText(context, e.message, Toast.LENGTH_LONG).show()
+
+                    binding.loading.visibility = View.GONE
                 }
 
                 return@thread
             }
 
             activity?.runOnUiThread {
+                binding.shoppingList.visibility = View.VISIBLE
+                binding.emptyShoppingList.visibility = View.VISIBLE
+                binding.addToShoppingList.visibility = View.VISIBLE
+                binding.loading.visibility = View.GONE
+
+                binding.shoppingList.emptyView = binding.emptyShoppingList
                 binding.shoppingList.adapter = ShoppingItemAdapter(requireContext(), ArrayList(items.toMutableList()))
             }
         }
@@ -162,11 +165,6 @@ class ShoppingListFragment : Fragment() {
             dialog.findViewById<Spinner>(R.id.unit_selector).adapter = adapter
         }
 
-        return root
-    }
-
-    override fun onDestroyView() {
-        super.onDestroyView()
-        _binding = null
+        return binding.root
     }
 }

app/app/src/main/res/layout/fragment_shopping_list.xml

@@ -1,10 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
+<RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <ProgressBar
+        android:id="@+id/loading"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerInParent="true"
+        android:visibility="gone"
+        android:indeterminate="true"
+    />
+
     <ListView
         android:id="@+id/shopping_list"
         android:layout_width="match_parent"
@@ -13,15 +22,24 @@
         android:dividerHeight="1dp"
     />
 
+    <TextView
+        android:id="@+id/empty_shopping_list"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerInParent="true"
+        android:text="@string/empty_shopping_list"
+    />
+
     <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/add_to_shopping_list"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_gravity="bottom|end"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentEnd="true"
         android:layout_margin="16dp"
         android:backgroundTint="@color/cyan"
         app:srcCompat="@android:drawable/ic_input_add"
         app:tint="@android:color/white"
     />
 
-</FrameLayout>
+</RelativeLayout>

app/app/src/main/res/values/strings.xml

@@ -40,6 +40,7 @@
     <string name="logout_label">Log out</string>
     <string name="checked_desc">Checked</string>
     <string name="delete_label">Delete</string>
+    <string name="empty_shopping_list">Your shopping list is empty</string>
     <string-array name="units">
         <item></item>
         <item>g</item>