Implement "no notifications" view, display when notifications list empty

Habitica/res/layout/no_notifications.xml

@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:orientation="horizontal"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="@dimen/spacing_large">
+
+    <LinearLayout
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:orientation="vertical"
+        android:paddingLeft="@dimen/spacing_medium"
+        android:paddingTop="44dp"
+        android:paddingRight="@dimen/spacing_medium">
+
+        <ImageView
+            android:id="@+id/noNotifications"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:background="@color/transparent"
+            android:clickable="false"
+            android:gravity="center"
+            android:src="@drawable/no_notifications" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingLeft="40dp"
+            android:paddingRight="40dp"
+            android:orientation="vertical"
+            android:paddingTop="26dp">
+
+            <TextView
+                style="@style/SectionTitle"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:gravity="center"
+                android:text="@string/no_notifications_title" />
+
+            <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:gravity="center"
+                android:lineHeight="20dp"
+                android:paddingTop="16dp"
+                android:text="@string/no_notifications_text" />
+        </LinearLayout>
+
+    </LinearLayout>
+
+</LinearLayout>

Habitica/res/values/strings.xml

@@ -860,6 +860,8 @@
     <string name="discover">Discover</string>
     <string name="damage_paused">Damage paused</string>
     <string name="preference_push_important_announcements">Important Announcements</string>
+    <string name="no_notifications_title">You’re all caught up!</string>
+    <string name="no_notifications_text">The notification fairies give you a raucous round of applause! Well done!</string>
     <string name="create">Create</string>
     <string name="only_leader_create_challenge">Only leader can create Challenges</string>
     <string name="create_party">Create Party</string>

Habitica/src/main/java/com/habitrpg/android/habitica/ui/activities/NotificationsActivity.kt

@@ -1,6 +1,8 @@
 package com.habitrpg.android.habitica.ui.activities
 
+import android.content.Context
 import android.os.Bundle
+import android.view.LayoutInflater
 import com.habitrpg.android.habitica.R
 import com.habitrpg.android.habitica.components.AppComponent
 import com.habitrpg.android.habitica.data.UserRepository
@@ -56,6 +58,19 @@ class NotificationsActivity : BaseActivity(), androidx.swiperefreshlayout.widget
     }
 
     private fun setNotifications(notifications: RealmList<GlobalNotification>) {
+        if (notification_items == null) {
+            return
+        }
+
+        notification_items.removeAllViewsInLayout()
+
+        val inflater = getSystemService(Context.LAYOUT_INFLATER_SERVICE) as? LayoutInflater
+        if (notifications.isEmpty()) {
+            val item = inflater?.inflate(R.layout.no_notifications, notification_items, false)
+            notification_items.addView(item)
+            return
+        }
+
         //TODO("not implemented")
     }
 }