Merge pull request #69 from ClaytonWWilson/async-loading

Async loading

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

@@ -1,5 +1,8 @@
 package com.example.listify;
 
+import android.app.Dialog;
+import android.graphics.Color;
+import android.graphics.drawable.ColorDrawable;
 import android.os.Bundle;
 
 import com.amplifyframework.auth.AuthException;
@@ -11,6 +14,8 @@ import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import android.view.View;
+import android.view.Window;
+import android.view.WindowManager;
 import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
@@ -71,6 +76,8 @@ public class ItemDetails extends AppCompatActivity implements ListPickerDialogFr
             @Override
             public void onClick(View v) {
                 closeFABMenu();
+                LoadingCircleDialog loadingDialog = new LoadingCircleDialog(ItemDetails.this);
+                loadingDialog.show();
 
                 Properties configs = new Properties();
                 try {
@@ -81,21 +88,57 @@ public class ItemDetails extends AppCompatActivity implements ListPickerDialogFr
 
                 Requestor requestor = new Requestor(am, configs.getProperty("apiKey"));
                 SynchronousReceiver<Integer[]> listIdsReceiver = new SynchronousReceiver<>();
-                SynchronousReceiver<List> listReceiver = new SynchronousReceiver<>();
-
                 requestor.getListOfIds(List.class, listIdsReceiver, listIdsReceiver);
-                try {
-                    Integer[] listIds = listIdsReceiver.await();
-                    for (int i = 0; i < listIds.length; i++) {
-                        requestor.getObject(Integer.toString(listIds[i]), List.class, listReceiver, listReceiver);
-                        shoppingLists.add(listReceiver.await());
-                    }
-                } catch (Exception e) {
-                    e.printStackTrace();
-                }
 
-                ListPickerDialogFragment listPickerDialog = new ListPickerDialogFragment(shoppingLists);
+                Thread t = new Thread(new Runnable() {
-                listPickerDialog.show(getSupportFragmentManager(), "User Lists");
+                    @Override
+                    public void run() {
+                        Integer[] listIds = null;
+                        try {
+                            listIds = listIdsReceiver.await();
+                        } catch (Exception e) {
+                            e.printStackTrace();
+                        }
+
+                        // Create threads and add them to a list
+                        Thread[] threads = new Thread[listIds.length];
+                        List[] results = new List[listIds.length];
+                        for (int i = 0; i < listIds.length; i++) {
+                            SynchronousReceiver<List> listReceiver = new SynchronousReceiver<>();
+                            requestor.getObject(Integer.toString(listIds[i]), List.class, listReceiver, listReceiver);
+                            final int finalI = i;
+                            Thread l = new Thread(new Runnable() {
+                                @Override
+                                public void run() {
+                                    try {
+                                        results[finalI] = listReceiver.await();
+                                    } catch (Exception e) {
+                                        e.printStackTrace();
+                                    }
+                                }
+                            });
+                            threads[i] = l;
+                            l.start();
+                        }
+
+                        shoppingLists.clear();
+                        // Wait for each thread to finish and add results to shoppingLists
+                        for (int i = 0; i < threads.length; i++) {
+                            try {
+                                threads[i].join();
+                            } catch (InterruptedException e) {
+                                e.printStackTrace();
+                            }
+                            shoppingLists.add(results[i]);
+                        }
+
+
+                        loadingDialog.cancel();
+                        ListPickerDialogFragment listPickerDialog = new ListPickerDialogFragment(shoppingLists);
+                        listPickerDialog.show(getSupportFragmentManager(), "User Lists");
+                    }
+                });
+                t.start();
             }
         });
 
@@ -157,7 +200,7 @@ public class ItemDetails extends AppCompatActivity implements ListPickerDialogFr
     }
 
 
-    // Add the viewed item to the selected list
+    // Add the selected item to the selected list
     @Override
     public void sendListSelection(int selectedListIndex, int quantity) {
 
@@ -184,6 +227,8 @@ public class ItemDetails extends AppCompatActivity implements ListPickerDialogFr
     // Create a new list and add the item to it
     @Override
     public void sendNewListName(String name, int quantity) {
+        LoadingCircleDialog loadingDialog = new LoadingCircleDialog(this);
+        loadingDialog.show();
 
         Properties configs = new Properties();
         try {
@@ -196,16 +241,34 @@ public class ItemDetails extends AppCompatActivity implements ListPickerDialogFr
 
         com.example.listify.data.List newList = new List(-1, name, "user filled by lambda", Instant.now().toEpochMilli());
 
-        try {
+        Thread t = new Thread(new Runnable() {
-            requestor.postObject(newList, idReceiver, idReceiver);
+            @Override
-            int newListId = idReceiver.await();
+            public void run() {
-            ListEntry entry = new ListEntry(newListId, curProduct.getItemId(), quantity, Instant.now().toEpochMilli(),false);
+                try {
-            requestor.postObject(entry);
+                    requestor.postObject(newList, idReceiver, idReceiver);
+                    int newListId = idReceiver.await();
+                    ListEntry entry = new ListEntry(newListId, curProduct.getItemId(), quantity, Instant.now().toEpochMilli(),false);
+                    requestor.postObject(entry);
 
-            Toast.makeText(this, String.format("%s created and item added", name), Toast.LENGTH_LONG).show();
+                    runOnUiThread(new Runnable() {
-        } catch (Exception e) {
+                        @Override
-            Toast.makeText(this, "An error occurred", Toast.LENGTH_LONG).show();
+                        public void run() {
-            e.printStackTrace();
+                            Toast.makeText(ItemDetails.this, String.format("%s created and item added", name), Toast.LENGTH_LONG).show();
-        }
+                            loadingDialog.cancel();
+                        }
+                    });
+                } catch (Exception e) {
+                    runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            Toast.makeText(ItemDetails.this, "An error occurred", Toast.LENGTH_LONG).show();
+                            loadingDialog.cancel();
+                            e.printStackTrace();
+                        }
+                    });
+                }
+            }
+        });
+        t.start();
     }
 }

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

@@ -28,7 +28,7 @@ import org.json.JSONException;
 
 import static com.example.listify.MainActivity.am;
 
-public class ListPage extends AppCompatActivity {
+public class ListPage extends AppCompatActivity implements Requestor.Receiver {
     ListView listView;
     MyAdapter myAdapter;
     Requestor requestor;
@@ -36,6 +36,7 @@ public class ListPage extends AppCompatActivity {
     Button incrQuan;
     Button decrQuan;
     Button removeItem;
+    ProgressBar loadingListItems;
 
     ArrayList<String> pNames = new ArrayList<>();
     ArrayList<String> pStores = new ArrayList<>();
@@ -50,11 +51,23 @@ public class ListPage extends AppCompatActivity {
 
     DecimalFormat df = new DecimalFormat("0.00");
 
+    // 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);
+
         pNames.add("Total Price");
         pStores.add("");
         pPrices.add("0.00");
@@ -62,6 +75,7 @@ public class ListPage extends AppCompatActivity {
         pImages.add("-1");
         pListItemPair.add(null);
 
+
         Properties configs = new Properties();
         try {
             configs = AuthManager.loadProperties(this, "android.resource://" + getPackageName() + "/raw/auths.json");
@@ -69,17 +83,31 @@ public class ListPage extends AppCompatActivity {
             e.printStackTrace();
         }
         requestor = new Requestor(am, configs.getProperty("apiKey"));
-        SynchronousReceiver<List> lr = new SynchronousReceiver<>();
+      
-        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()) {
@@ -123,7 +151,6 @@ public class ListPage extends AppCompatActivity {
 
                         double newTotal = Double.parseDouble(pPrices.get(0)) + (item.getPrice().doubleValue() * entry.getQuantity());
                         pPrices.set(0, df.format(newTotal));
-
                         index++;
 
                         pNames.add(index, item.getDescription());
@@ -141,15 +168,15 @@ public class ListPage extends AppCompatActivity {
                     }
                 }
             }
+
+            runOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    loadingListItems.setVisibility(View.GONE);
+                    myAdapter.notifyDataSetChanged();
+                }
+            });
         }
-
-        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/java/com/example/listify/LoadingCircleDialog.java

@@ -0,0 +1,36 @@
+package com.example.listify;
+
+import android.app.Dialog;
+import android.content.Context;
+import android.graphics.Color;
+import android.graphics.drawable.ColorDrawable;
+import android.view.Window;
+import android.view.WindowManager;
+
+public class LoadingCircleDialog {
+    Dialog loadingDialog;
+
+    public LoadingCircleDialog(Context context) {
+        loadingDialog = new Dialog(context);
+
+        // Create and show a loading dialog
+        loadingDialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
+        loadingDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
+
+        // layout to display
+        loadingDialog.setContentView(R.layout.dialog_loading);
+
+        // set color transpartent
+        loadingDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
+        loadingDialog.setCancelable(false);
+        loadingDialog.setCanceledOnTouchOutside(false);
+    }
+
+    public void show() {
+        loadingDialog.show();
+    }
+
+    public void cancel() {
+        loadingDialog.cancel();
+    }
+}

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

@@ -9,6 +9,7 @@ import android.widget.EditText;
 import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.ListView;
+import android.widget.ProgressBar;
 import android.widget.SearchView;
 import com.example.listify.adapter.SearchResultsListAdapter;
 import com.example.listify.data.ItemSearch;
@@ -22,8 +23,8 @@ import java.util.Properties;
 
 import static com.example.listify.MainActivity.am;
 
-public class SearchResults extends AppCompatActivity implements SortDialogFragment.OnSortingListener {
+public class SearchResults extends AppCompatActivity implements SortDialogFragment.OnSortingListener, Requestor.Receiver {
-    private ListView listView;
+    private ProgressBar loadingSearch;
     private SearchResultsListAdapter searchResultsListAdapter;
     private List<Product> resultsProductList = new ArrayList<>();
     private List<Product> resultsProductListSorted = new ArrayList<>();
@@ -47,6 +48,8 @@ public class SearchResults extends AppCompatActivity implements SortDialogFragme
         Toolbar toolbar = findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
 
+        loadingSearch = (ProgressBar) findViewById(R.id.progress_loading_search);
+
         // Back button closes this activity and returns to previous activity (MainActivity)
         ImageButton backButton = (ImageButton) findViewById(R.id.backToHomeButton);
         backButton.setOnClickListener(new View.OnClickListener() {
@@ -77,7 +80,7 @@ public class SearchResults extends AppCompatActivity implements SortDialogFragme
             }
         });
 
-        listView = (ListView) findViewById(R.id.search_results_list);
+        ListView listView = (ListView) findViewById(R.id.search_results_list);
         searchResultsListAdapter = new SearchResultsListAdapter(this, resultsProductListSorted);
         listView.setAdapter(searchResultsListAdapter);
         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@@ -96,6 +99,15 @@ public class SearchResults extends AppCompatActivity implements SortDialogFragme
         searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
             @Override
             public boolean onQueryTextSubmit(String query) {
+                // Show progress bar
+                loadingSearch.setVisibility(View.VISIBLE);
+
+                // Clear the old search results
+                resultsProductList.clear();
+
+                // Clear old search results from the view
+                resultsProductListSorted.clear();
+                searchResultsListAdapter.notifyDataSetChanged();
                 doSearch(query);
                 return false;
             }
@@ -122,12 +134,8 @@ public class SearchResults extends AppCompatActivity implements SortDialogFragme
                 sortDialog.show(getSupportFragmentManager(), "Sort");
             }
         });
-
     }
 
-
-
-
     // Override default phone back button to add animation
     @Override
     public void onBackPressed() {
@@ -136,10 +144,6 @@ public class SearchResults extends AppCompatActivity implements SortDialogFragme
     }
 
     private void doSearch(String query) {
-
-        // Clear the old search results
-        resultsProductList.clear();
-
         Properties configs = new Properties();
         try {
             configs = AuthManager.loadProperties(this, "android.resource://" + getPackageName() + "/raw/auths.json");
@@ -148,32 +152,7 @@ public class SearchResults extends AppCompatActivity implements SortDialogFragme
         }
 
         Requestor requestor = new Requestor(am, configs.getProperty("apiKey"));
-
+        requestor.getObject(query, ItemSearch.class, this);
-        SynchronousReceiver<ItemSearch> itemReceiver = new SynchronousReceiver<>();
-        requestor.getObject(query, ItemSearch.class, itemReceiver, itemReceiver);
-        ItemSearch results;
-        try {
-            results = itemReceiver.await();
-            for (int i = 0; i < results.getResults().size(); i++) {
-                // TODO: Change to dynamically grab chain name by id
-                resultsProductList.add(new Product(results.getResults().get(i).getDescription(), results.getResults().get(i).getProductID(), "Kroger", results.getResults().get(i).getChainID(), results.getResults().get(i).getUpc(), results.getResults().get(i).getDescription(), results.getResults().get(i).getPrice(), results.getResults().get(i).getImageURL(), results.getResults().get(i).getDepartment()));
-            }
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-
-        // Create a list of all stores in the results so the user can filter by store name
-        for (int i = 0; i < resultsProductList.size(); i++) {
-            if (!stores.contains(resultsProductList.get(i).getChainName())) {
-                stores.add(resultsProductList.get(i).getChainName());
-            }
-        }
-
-        // Add all results to the sorted list
-        resultsProductListSorted.addAll(resultsProductList);
-
-        // Apply selected sorting to the list
-        sortResults();
     }
 
     // Sorts the search results
@@ -203,7 +182,6 @@ public class SearchResults extends AppCompatActivity implements SortDialogFragme
                 });
                 break;
 
-            // TODO: May need to change this depending on if price is stored as a string or a double
             case 2:
                 resultsProductListSorted.sort(new Comparator<Product>() {
                     @Override
@@ -257,7 +235,57 @@ public class SearchResults extends AppCompatActivity implements SortDialogFragme
             resultsProductListSorted.clear();
             resultsProductListSorted.addAll(temp);
         }
+    }
 
-        searchResultsListAdapter.notifyDataSetChanged();
+    // This is called after the search results come back from the server
+    // TODO: Display a "no results" message if nothing is found when searching
+    @Override
+    public void acceptDelivery(Object delivered) {
+        ItemSearch results = (ItemSearch) delivered;
+
+        try {
+            for (int i = 0; i < results.getResults().size(); i++) {
+                // TODO: Change to dynamically grab chain name by id
+                resultsProductList.add(new Product(
+                        results.getResults().get(i).getDescription(),
+                        results.getResults().get(i).getProductID(),
+                        "Kroger",
+                        results.getResults().get(i).getChainID(),
+                        results.getResults().get(i).getUpc(),
+                        results.getResults().get(i).getDescription(),
+                        results.getResults().get(i).getPrice(),
+                        results.getResults().get(i).getImageURL(),
+                        results.getResults().get(i).getDepartment()
+                ));
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        // Create a list of all stores in the results so the user can filter by store name
+        for (int i = 0; i < resultsProductList.size(); i++) {
+            if (!stores.contains(resultsProductList.get(i).getChainName())) {
+                stores.add(resultsProductList.get(i).getChainName());
+            }
+        }
+
+        // Add all results to the sorted list
+        resultsProductListSorted.addAll(resultsProductList);
+
+        // Apply selected sorting to the list
+        sortResults();
+
+        // Updates the list of search results. Runs on the main UI thread since other threads are
+        // not allowed to change UI elements
+        runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                searchResultsListAdapter.notifyDataSetChanged();
+
+                // Hide progress bar
+                loadingSearch.setVisibility(View.GONE);
+
+            }
+        });
     }
 }

Listify/app/src/main/java/com/example/listify/ui/lists/ListsFragment.java

@@ -1,15 +1,22 @@
 package com.example.listify.ui.lists;
 
+import android.app.Dialog;
 import android.content.Intent;
+import android.graphics.Color;
+import android.graphics.drawable.ColorDrawable;
 import android.os.Bundle;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.LayoutInflater;
+import android.view.Window;
+import android.view.WindowManager;
 import android.widget.AdapterView;
 import android.widget.ListView;
+import android.widget.ProgressBar;
 import android.widget.Toast;
 import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
+import androidx.fragment.app.ListFragment;
 
 import com.amplifyframework.auth.AuthException;
 import com.example.listify.AuthManager;
@@ -17,6 +24,7 @@ import com.example.listify.CreateListAddDialogFragment;
 import com.example.listify.CreateListDialogFragment;
 import com.example.listify.ItemDetails;
 import com.example.listify.ListPage;
+import com.example.listify.LoadingCircleDialog;
 import com.example.listify.R;
 import com.example.listify.Requestor;
 import com.example.listify.SearchResults;
@@ -34,16 +42,20 @@ import java.util.Properties;
 
 import static com.example.listify.MainActivity.am;
 
-public class ListsFragment extends Fragment implements CreateListDialogFragment.OnNewListListener {
+public class ListsFragment extends Fragment implements CreateListDialogFragment.OnNewListListener, Requestor.Receiver {
     ArrayList<List> shoppingLists = new ArrayList<>();
     DisplayShoppingListsAdapter displayShoppingListsAdapter;
+    Requestor requestor;
     ListView shoppingListsView;
+    ProgressBar loadingLists;
+    int resultsIndex;
 
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View root = inflater.inflate(R.layout.fragment_lists, container, false);
         shoppingListsView = root.findViewById(R.id.shopping_lists);
+        loadingLists = (ProgressBar) root.findViewById(R.id.progress_loading_lists);
+        loadingLists.setVisibility(View.VISIBLE);
 
-        // TODO: Switch this to async
         Properties configs = new Properties();
         try {
             configs = AuthManager.loadProperties(getContext(), "android.resource://" + getActivity().getPackageName() + "/raw/auths.json");
@@ -51,36 +63,13 @@ public class ListsFragment extends Fragment implements CreateListDialogFragment.
             e.printStackTrace();
         }
 
-        Requestor requestor = new Requestor(am, configs.getProperty("apiKey"));
+        requestor = new Requestor(am, configs.getProperty("apiKey"));
         SynchronousReceiver<Integer[]> listIdsReceiver = new SynchronousReceiver<>();
-        SynchronousReceiver<List> listReceiver = new SynchronousReceiver<>();
 
-        requestor.getListOfIds(List.class, listIdsReceiver, listIdsReceiver);
+        final Requestor.Receiver<Integer[]> recv = this;
-        try {
+        requestor.getListOfIds(List.class, recv, null);
-            Integer[] listIds = listIdsReceiver.await();
-            for (int i = 0; i < listIds.length; i++) {
-                requestor.getObject(Integer.toString(listIds[i]), List.class, listReceiver, listReceiver);
-                shoppingLists.add(listReceiver.await());
-            }
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
 
 
-        // Set adapter and display this users lists
-        displayShoppingListsAdapter = new DisplayShoppingListsAdapter(getActivity(), shoppingLists);
-        shoppingListsView.setAdapter(displayShoppingListsAdapter);
-        shoppingListsView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
-            @Override
-            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
-                Intent listPage = new Intent(getContext(), ListPage.class);
-
-                // Send the list ID
-                listPage.putExtra("listID", shoppingLists.get(position).getItemID());
-                startActivity(listPage);
-            }
-        });
-
         FloatingActionButton fab = (FloatingActionButton) root.findViewById(R.id.new_list_fab);
         Fragment thisFragment = this;
         fab.setOnClickListener(new View.OnClickListener() {
@@ -97,6 +86,8 @@ public class ListsFragment extends Fragment implements CreateListDialogFragment.
 
     @Override
     public void sendNewListName(String name) {
+        LoadingCircleDialog loadingDialog = new LoadingCircleDialog(getActivity());
+        loadingDialog.show();
 
         Properties configs = new Properties();
         try {
@@ -111,13 +102,95 @@ public class ListsFragment extends Fragment implements CreateListDialogFragment.
 
         try {
             requestor.postObject(newList, idReceiver, idReceiver);
-            newList.setItemID(idReceiver.await());
-            shoppingLists.add(newList);
-            displayShoppingListsAdapter.notifyDataSetChanged();
-            Toast.makeText(getContext(), String.format("%s created", name), Toast.LENGTH_LONG).show();
         } catch (Exception e) {
             Toast.makeText(getContext(), "An error occurred", Toast.LENGTH_LONG).show();
             e.printStackTrace();
         }
+        Thread t = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    newList.setItemID(idReceiver.await());
+                } catch (Exception e) {
+                    getActivity().runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            Toast.makeText(getContext(), "An error occurred", Toast.LENGTH_LONG).show();
+                            loadingDialog.cancel();
+                        }
+                    });
+                    e.printStackTrace();
+
+                }
+                shoppingLists.add(newList);
+
+                getActivity().runOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        displayShoppingListsAdapter.notifyDataSetChanged();
+                        loadingDialog.cancel();
+                        Toast.makeText(getContext(), String.format("%s created", name), Toast.LENGTH_LONG).show();
+                    }
+                });
+            }
+        });
+        t.start();
+    }
+
+    @Override
+    public void acceptDelivery(Object delivered) {
+        Integer[] listIds = (Integer[]) delivered;
+        // Create threads and add them to a list
+        Thread[] threads = new Thread[listIds.length];
+        List[] results = new List[listIds.length];
+        for (int i = 0; i < listIds.length; i++) {
+            SynchronousReceiver<List> listReceiver = new SynchronousReceiver<>();
+            requestor.getObject(Integer.toString(listIds[i]), List.class, listReceiver, listReceiver);
+            final int finalI = i;
+            Thread t = new Thread(new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        results[finalI] = listReceiver.await();
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    }
+                }
+            });
+            threads[i] = t;
+            t.start();
+        }
+
+        // Wait for each thread to finish and add results to shoppingLists
+        for (int i = 0; i < threads.length; i++) {
+            try {
+                threads[i].join();
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            shoppingLists.add(results[i]);
+        }
+
+        // Set adapter and display this users lists
+        displayShoppingListsAdapter = new DisplayShoppingListsAdapter(getActivity(), shoppingLists);
+
+        getActivity().runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                shoppingListsView.setAdapter(displayShoppingListsAdapter);
+                shoppingListsView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+                    @Override
+                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+                        Intent listPage = new Intent(getContext(), ListPage.class);
+
+                        // Send the list ID
+                        listPage.putExtra("listID", shoppingLists.get(position).getItemID());
+                        startActivity(listPage);
+                    }
+                });
+                loadingLists.setVisibility(View.GONE);
+            }
+        });
+
     }
 }

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>

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

@@ -12,6 +12,16 @@
     tools:context=".SearchResults"
     tools:showIn="@layout/activity_search_results">
 
+    <ProgressBar
+        android:id="@+id/progress_loading_search"
+        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:id="@+id/search_results_list"
         android:layout_width="fill_parent"

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

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@null">
+
+    <ProgressBar
+        android:id="@+id/progress_loading_lists"
+        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="visible"/>
+</RelativeLayout>

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

@@ -12,6 +12,16 @@
     tools:context=".ui.lists.ListsFragment"
     tools:showIn="@layout/fragment_lists">
 
+    <ProgressBar
+        android:id="@+id/progress_loading_lists"
+        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:id="@+id/shopping_lists"
         android:layout_width="fill_parent"