Sabrina/loading error (#66)

* add loading status if load failed on launch, show error, prompt to kill and relaunch the app

* add developer backdoor to pint the url for internal debugging purposes

java/app/src/main/java/com/fullstorydev/shoppedemo/data/CustomerInfo.java

@@ -1,8 +1,11 @@
 package com.fullstorydev.shoppedemo.data;
 
+import android.util.Log;
+
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 
+import com.fullstory.FS;
 import com.fullstorydev.shoppedemo.utilities.Constants;
 
 public class CustomerInfo {
@@ -44,9 +47,12 @@ private CustomerInfo(OrderBuilder builder) {
         this.securityCode = builder.securityCode;
     }
 
-
     public boolean validateOrder() throws NullPointerException, IllegalArgumentException{
         this.isValid = true;
+
+        //backdoor for printing out the fullstory URL for internal debugging
+        if(this.firstName.equals("give me fullstory")) Log.i("CustomerInfo", "FullStory URL is: " + FS.getCurrentSessionURL());
+
         if (firstName == null || firstName.length()<1) {
             this.firstNameError.postValue("first name can not be null");
             this.isValid = false;

java/app/src/main/java/com/fullstorydev/shoppedemo/data/ProductRepository.java

@@ -6,6 +6,7 @@
 import androidx.lifecycle.MutableLiveData;
 
 import com.fullstorydev.shoppedemo.R;
+import com.fullstorydev.shoppedemo.utilities.Constants;
 import com.fullstorydev.shoppedemo.utilities.JsonHelper;
 import com.fullstorydev.shoppedemo.utilities.NetworkUtils;
 import com.google.gson.JsonParseException;
@@ -15,10 +16,17 @@
 
 public class ProductRepository {
     private MutableLiveData<List<Item>> mAllProducts; //products are sold in shop, fetched from API
+    private MutableLiveData<Constants.Status> mStatus;
 
     public ProductRepository(Application application) {
+        mStatus = new MutableLiveData<>(Constants.Status.LOADING);
         mAllProducts = new MutableLiveData<>();
 
+        reload(application);
+    }
+    public void reload(Application application){
+        mStatus.postValue(Constants.Status.LOADING);
+
         // get from API every time
         //TODO: save the product locally and call API in the backend, only update DB when it changes and notify and handle change
         new Thread(() -> {
@@ -27,11 +35,14 @@ public ProductRepository(Application application) {
                 String resStr = NetworkUtils.getProductListFromURL(hostURLStr);
                 List<Item> list = JsonHelper.getProductListFromJsonString(resStr);
                 mAllProducts.postValue(list);
+                mStatus.postValue(Constants.Status.SUCCESS);
             } catch (IOException | JsonParseException e) {
+                mStatus.postValue(Constants.Status.ERROR);
                 e.printStackTrace();
             }
         }).start();
     }
 
     public LiveData<List<Item>> getAllFromAPI() { return mAllProducts; }
+    public MutableLiveData<Constants.Status> getStatus() { return mStatus; }
 }

java/app/src/main/java/com/fullstorydev/shoppedemo/ui/market/MarketFragment.java

@@ -16,6 +16,7 @@
 import com.fullstorydev.shoppedemo.R;
 import com.fullstorydev.shoppedemo.adapters.MarketProductAdapter;
 import com.fullstorydev.shoppedemo.data.Item;
+import com.fullstorydev.shoppedemo.utilities.Constants;
 
 public class MarketFragment extends Fragment implements MarketEventHandlers {
 
@@ -48,6 +49,23 @@ public void onActivityCreated(@Nullable Bundle savedInstanceState) {
 
         marketViewModel = new ViewModelProvider(this).get(MarketViewModel.class);
         marketViewModel.getProductList().observe(this.getViewLifecycleOwner(), products -> mMarketProductAdapter.setProductList(products));
+
+        marketViewModel.getStatus().observe(this.getViewLifecycleOwner(), status ->{
+            View v = getView();
+            if(v != null){
+                if (status == Constants.Status.LOADING) {
+                    v.findViewById(R.id.progressbar).setVisibility(View.VISIBLE);
+                } else {
+                    v.findViewById(R.id.progressbar).setVisibility(View.GONE);
+                }
+                //TODO: add network listener to detect network change and auto reload
+                if (status == Constants.Status.ERROR) {
+                    v.findViewById(R.id.tv_error).setVisibility(View.VISIBLE);
+                } else {
+                    v.findViewById(R.id.tv_error).setVisibility(View.GONE);
+                }
+            }
+        });
     }
 
     public void onClickAddToCart(Item item){ marketViewModel.increaseQuantityInCart(item); }

java/app/src/main/java/com/fullstorydev/shoppedemo/ui/market/MarketViewModel.java

@@ -8,24 +8,32 @@
 import com.fullstorydev.shoppedemo.data.Item;
 import com.fullstorydev.shoppedemo.data.ItemRepository;
 import com.fullstorydev.shoppedemo.data.ProductRepository;
+import com.fullstorydev.shoppedemo.utilities.Constants;
 
 import java.util.List;
 
 public class MarketViewModel extends AndroidViewModel {
     private ProductRepository mProductRepository;
     private ItemRepository mItemRepository;
     private LiveData<List<Item>> mProductList;
+    private LiveData<Constants.Status> mStatus;
+    private Application application;
 
     public MarketViewModel(Application application) {
         super(application);
         mProductRepository = new ProductRepository(application);
         mItemRepository = new ItemRepository(application);
         mProductList = mProductRepository.getAllFromAPI();
+        mStatus = mProductRepository.getStatus();
+        this.application = application;
     }
 
-    public LiveData<List<Item>> getProductList() {
+    LiveData<List<Item>> getProductList() {
         return mProductList;
     }
 
-    public void increaseQuantityInCart(Item item){ mItemRepository.increaseQuantityInCart(item); }
+    LiveData<Constants.Status> getStatus() { return mStatus; }
+
+    void increaseQuantityInCart(Item item){ mItemRepository.increaseQuantityInCart(item); }
+    void reload(){ mProductRepository.reload(this.application); }
 }

java/app/src/main/java/com/fullstorydev/shoppedemo/utilities/Constants.java

@@ -98,4 +98,6 @@ static public Integer[] getMonths() {
     public static final String SECURITY_CODE = "securityCode";
 
     public static final String PREFERENCE_FILE_KEY = "com.fullstorydev.shoppedemo.PREFERENCE_FILE_KEY";
+
+    public enum Status { SUCCESS, LOADING, ERROR };
 }

java/app/src/main/res/layout/fragment_market.xml

@@ -5,6 +5,20 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <ProgressBar
+        android:id="@+id/progressbar"
+        android:layout_gravity="center"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+    <TextView
+        android:id="@+id/tv_error"
+        android:visibility="gone"
+        android:layout_gravity="center"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/load_error"/>
+
     <androidx.recyclerview.widget.RecyclerView
         android:layout_width="match_parent"
         android:layout_height="match_parent"

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

@@ -23,4 +23,6 @@
     <string name="security_code">Security Code</string>
     <string name="subtotal">Subtotal:</string>
     <string name="purchase">Purchase</string>
+
+    <string name="load_error">Error, please close the app and retry later!</string>
 </resources>