implement empty view for shops

Habitica/res/layout/empty_view_seasonal_shop.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:padding="21dp">
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:src="@drawable/shop_empty_seasonal" />
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/come_back_soon"
+        android:textSize="18sp"
+        android:gravity="center"
+        android:textColor="@color/gray_200"/>
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/seasonal_closed_description"
+        android:textColor="@color/gray_300"
+        android:layout_marginTop="12dp"
+        android:gravity="center"
+        android:textSize="14sp"/>
+</LinearLayout>

Habitica/res/layout/empty_view_timetravelers.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:padding="21dp">
+    <ImageView
+        android:src="@drawable/shop_empty_hourglass"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/subscribe_for_hourglasses"
+        android:textSize="18sp"
+        android:gravity="center"
+        android:textColor="@color/gray_200"/>
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/timetravelers_closed_description"
+        android:textColor="@color/gray_300"
+        android:layout_marginTop="12dp"
+        android:gravity="center"
+        android:textSize="14sp"/>
+    <Button
+        android:id="@+id/subscribeButton"
+        android:layout_width="match_parent"
+        android:layout_height="38dp"
+        android:text="@string/want_to_subscribe"
+        android:textColor="@color/brand_400"
+        android:background="@drawable/layout_rounded_bg_lighter_gray"
+        android:layout_marginTop="18dp"/>
+</LinearLayout>

Habitica/res/layout/fragment_shop.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.design.widget.CoordinatorLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/coordinatorLayout"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            style="@style/FragmentDialogTitle"
+            android:id="@+id/titleTextView"
+            android:background="@color/brand_100"
+            android:textColor="@android:color/white" />
+        <com.habitrpg.android.habitica.ui.helpers.RecyclerViewEmptySupport
+            android:id="@+id/recyclerView"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:scrollbarSize="3dp"
+            android:scrollbarThumbVertical="@color/md_grey_500"
+            android:scrollbars="vertical"
+            android:paddingBottom="?attr/actionBarSize" />
+
+        <FrameLayout
+            android:id="@+id/empty_view"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:orientation="vertical"
+            android:gravity="center" />
+    </LinearLayout>
+
+</android.support.design.widget.CoordinatorLayout>

Habitica/res/values/strings.xml

@@ -660,4 +660,9 @@
     <string name="purchase_gems">Purchase gems</string>
     <string name="insufficientHourglasses">You\'ll need more Mystic Hourglasses to buy this item!</string>
     <string name="get_hourglasses">Get hourglasses</string>
+    <string name="subscribe_for_hourglasses">Subscribe for Hourglasses</string>
+    <string name="timetravelers_closed_description">Earn one Mystic Hourglass for every three months of consecutive subscription, then use them to unlock limited edition items, pets, and mounts from the past… and future!</string>
+    <string name="want_to_subscribe">I want to Subscribe</string>
+    <string name="seasonal_closed_description">The Grand Galas happen close to the solstices and equinoxes, so check back then to find a fun assortment of special seasonal items!</string>
+    <string name="come_back_soon">Come back soon!</string>
 </resources>

Habitica/src/main/java/com/habitrpg/android/habitica/ui/adapter/inventory/ShopRecyclerAdapter.java

@@ -12,6 +12,7 @@ import android.text.method.LinkMovementMethod;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.TextView;
 
@@ -26,6 +27,7 @@ import com.facebook.imagepipeline.image.CloseableImage;
 import com.facebook.imagepipeline.request.ImageRequest;
 import com.facebook.imagepipeline.request.ImageRequestBuilder;
 import com.habitrpg.android.habitica.R;
+import com.habitrpg.android.habitica.events.commands.OpenGemPurchaseFragmentCommand;
 import com.habitrpg.android.habitica.helpers.RxErrorHandler;
 import com.habitrpg.android.habitica.models.inventory.Item;
 import com.habitrpg.android.habitica.models.shops.Shop;
@@ -36,6 +38,8 @@ import com.habitrpg.android.habitica.ui.helpers.DataBindingUtils;
 import com.habitrpg.android.habitica.ui.viewHolders.SectionViewHolder;
 import com.habitrpg.android.habitica.ui.viewHolders.ShopItemViewHolder;
 
+import org.greenrobot.eventbus.EventBus;
+
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -85,6 +89,10 @@ public class ShopRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
                     .inflate(R.layout.shop_section_header, parent, false);
 
             return new SectionViewHolder(view);
+        } else if (viewType == 2) {
+            View view = LayoutInflater.from(parent.getContext())
+                    .inflate(getEmptyViewResource(), parent, false);
+            return new EmptyStateViewHolder(view);
         } else {
             View view = LayoutInflater.from(parent.getContext())
                     .inflate(R.layout.row_shopitem, parent, false);
@@ -94,14 +102,26 @@ public class ShopRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
         }
     }
 
+    private int getEmptyViewResource() {
+        if (Shop.SEASONAL_SHOP.equals(this.shopIdentifier)) {
+            return R.layout.empty_view_seasonal_shop;
+        } else if (Shop.TIME_TRAVELERS_SHOP.equals(this.shopIdentifier)) {
+            return R.layout.empty_view_timetravelers;
+        }
+        return R.layout.simple_textview;
+    }
+
     @Override
     public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
+        if (position > (this.items.size()-1)) {
+            return;
+        }
         Object obj = this.items.get(position);
         if (obj.getClass().equals(Shop.class)) {
             ((ShopHeaderViewHolder) holder).bind((Shop) obj, shopSpriteSuffix);
         } else if (obj.getClass().equals(ShopCategory.class)) {
             ((SectionViewHolder) holder).bind(((ShopCategory) obj).getText());
-        } else {
+        } else if (obj.getClass().equals(ShopItem.class)) {
             ShopItem item = (ShopItem) items.get(position);
             ((ShopItemViewHolder) holder).bind(item, item.canBuy(user));
             if (ownedItems.containsKey(item.getKey())) {
@@ -113,18 +133,24 @@ public class ShopRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
 
     @Override
     public int getItemViewType(int position) {
-        if (this.items.get(position).getClass().equals(Shop.class)) {
+        if (position > (this.items.size()-1)) {
+            return 2;
+        } else if (this.items.get(position).getClass().equals(Shop.class)) {
             return 0;
         } else if (this.items.get(position).getClass().equals(ShopCategory.class)) {
             return 1;
         } else {
-            return 2;
+            return 3;
         }
     }
 
     @Override
     public int getItemCount() {
-        return items != null ? items.size() : 0;
+        int size = items != null ? items.size() : 0;
+        if (size == 1) {
+            return 2;
+        }
+        return size;
     }
 
     public void setOwnedItems(Map<String, Item> ownedItems) {
@@ -208,4 +234,19 @@ public class ShopRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
         }
 
     }
+
+    public static class EmptyStateViewHolder extends RecyclerView.ViewHolder {
+        @BindView(R.id.subscribeButton)
+        @Nullable
+        Button subscribeButton;
+
+        public EmptyStateViewHolder(View view) {
+            super(view);
+            ButterKnife.bind(this, view);
+
+            if (subscribeButton != null) {
+                subscribeButton.setOnClickListener(view1 -> EventBus.getDefault().post(new OpenGemPurchaseFragmentCommand()));
+            }
+        }
+    }
 }

Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/inventory/shops/ShopFragment.java

@@ -6,6 +6,7 @@ import android.support.v7.widget.GridLayoutManager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.FrameLayout;
 import android.widget.TextView;
 
 import com.habitrpg.android.habitica.R;
@@ -74,7 +75,7 @@ public class ShopFragment extends BaseFragment {
             layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
                 @Override
                 public int getSpanSize(int position) {
-                    if (adapter.getItemViewType(position) < 2) {
+                    if (adapter.getItemViewType(position) < 3) {
                         return layoutManager.getSpanCount();
                     } else {
                         return 1;