Async loading list products

Listify/app/src/main/java/com/example/listify/ListPage.java

@@ -21,13 +21,14 @@ import java.util.Properties;
 
 import static com.example.listify.MainActivity.am;
 
-public class ListPage extends AppCompatActivity {
+public class ListPage extends AppCompatActivity implements Requestor.Receiver {
     ListView listView;
     MyAdapter myAdapter;
 
     Button incrQuan;
     Button decrQuan;
     Button removeItem;
+    ProgressBar loadingListItems;
 
     ArrayList<String> pNames = new ArrayList<>();
     ArrayList<String> pStores = new ArrayList<>();
@@ -39,11 +40,23 @@ public class ListPage extends AppCompatActivity {
 
     Requestor requestor;
 
+    // TODO: Display a message if their list is empty
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         // Read list ID from caller
         final int listID = (int) getIntent().getSerializableExtra("listID");
 
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_list);
+
+        listView = findViewById(R.id.listView);
+        myAdapter = new MyAdapter(this, pNames, pStores, pPrices, pQuantity, pImages);
+
+        listView.setAdapter(myAdapter);
+
+        loadingListItems = findViewById(R.id.progress_loading_list_items);
+        loadingListItems.setVisibility(View.VISIBLE);
+
         Properties configs = new Properties();
         try {
             configs = AuthManager.loadProperties(this, "android.resource://" + getPackageName() + "/raw/auths.json");
@@ -51,19 +64,32 @@ public class ListPage extends AppCompatActivity {
             e.printStackTrace();
         }
         requestor = new Requestor(am, configs.getProperty("apiKey"));
-        SynchronousReceiver<List> lr = new SynchronousReceiver<>();
         //ListReceiver<List> lr = new ListReceiver<>();
-        requestor.getObject(Integer.toString(listID), List.class, lr);
+        requestor.getObject(Integer.toString(listID), List.class, this);
 
-        List list;
+        /*pNames.add("Half-gallon organic whole milk");
+        pStores.add("Kroger");
+        pPrices.add("$5.00");
+        pQuantity.add("1");
+        pImages.add(R.drawable.milk);
 
-        try {
+        pNames.add("5-bunch medium bananas");
-            list = lr.await();
+        pStores.add("Kroger");
-        }
+        pPrices.add("$3.00");
-        catch (Exception e) {
+        pQuantity.add("1");
-            list = null;
+        pImages.add(R.drawable.bananas);
+
+        pNames.add("JIF 40-oz creamy peanut butter");
+        pStores.add("Kroger");
+        pPrices.add("$7.00");
+        pQuantity.add("1");
+        pImages.add(R.drawable.peanutbutter);*/
     }
 
+    @Override
+    public void acceptDelivery(Object delivered) {
+        List list = (List) delivered;
+
         if(list != null) {
             for (ListEntry entry : list.getEntries()) {
                 int product = entry.getProductID();
@@ -87,31 +113,13 @@ public class ListPage extends AppCompatActivity {
             }
         }
 
-        /*pNames.add("Half-gallon organic whole milk");
+        runOnUiThread(new Runnable() {
-        pStores.add("Kroger");
+            @Override
-        pPrices.add("$5.00");
+            public void run() {
-        pQuantity.add("1");
+                loadingListItems.setVisibility(View.GONE);
-        pImages.add(R.drawable.milk);
+                myAdapter.notifyDataSetChanged();
-
+            }
-        pNames.add("5-bunch medium bananas");
+        });
-        pStores.add("Kroger");
-        pPrices.add("$3.00");
-        pQuantity.add("1");
-        pImages.add(R.drawable.bananas);
-
-        pNames.add("JIF 40-oz creamy peanut butter");
-        pStores.add("Kroger");
-        pPrices.add("$7.00");
-        pQuantity.add("1");
-        pImages.add(R.drawable.peanutbutter);*/
-
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_list);
-
-        listView = findViewById(R.id.listView);
-        myAdapter = new MyAdapter(this, pNames, pStores, pPrices, pQuantity, pImages);
-
-        listView.setAdapter(myAdapter);
     }
 
     class MyAdapter extends ArrayAdapter<String> {

Listify/app/src/main/res/layout/activity_list.xml

@@ -1,9 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout
+<RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <ProgressBar
+        android:id="@+id/progress_loading_list_items"
+        style="?android:attr/progressBarStyleLarge"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerHorizontal="true"
+        android:layout_centerVertical="true"
+        android:indeterminate="true"
+        android:visibility="gone"/>
+
     <ListView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
@@ -11,4 +21,4 @@
 
     </ListView>
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+</RelativeLayout>