Add favourites support

app/src/main/java/net/underdesk/circolapp/adapters/CircularLetterAdapter.kt

@@ -32,6 +32,7 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import kotlinx.android.synthetic.main.item_circular.view.*
 import net.underdesk.circolapp.R
+import net.underdesk.circolapp.data.AppDatabase
 import net.underdesk.circolapp.data.Circular
 
 
@@ -85,6 +86,15 @@ class CircularLetterAdapter(private val circulars: List<Circular>) :
             (context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager).enqueue(request)
         }
 
+        holder.favouriteButton.setOnClickListener {
+            object : Thread() {
+                override fun run() {
+                    AppDatabase.getInstance(context).circularDao()
+                        .update(circulars[position].apply { favourite = !favourite })
+                }
+            }.start()
+        }
+
         holder.collapseButton.setOnClickListener {
             if (holder.viewButton.visibility == View.VISIBLE) {
                 holder.viewButton.visibility = View.GONE

app/src/main/java/net/underdesk/circolapp/data/Circular.kt

@@ -28,6 +28,7 @@ data class Circular(
     val name: String,
     val url: String,
     val date: String,
+    var favourite: Boolean = false,
     val attachmentsNames: MutableList<String> = mutableListOf(),
     val attachmentsUrls: MutableList<String> = mutableListOf()
 ) {

app/src/main/java/net/underdesk/circolapp/data/CircularDao.kt

@@ -18,19 +18,23 @@
 
 package net.underdesk.circolapp.data
 
-import androidx.room.Dao
+import androidx.lifecycle.LiveData
-import androidx.room.Insert
+import androidx.room.*
-import androidx.room.OnConflictStrategy
-import androidx.room.Query
 
 @Dao
 interface CircularDao {
     @Query("SELECT * FROM circulars ORDER BY id DESC")
     fun getCirculars(): List<Circular>
 
+    @Query("SELECT * FROM circulars WHERE favourite ORDER BY id DESC")
+    fun getFavourites(): LiveData<List<Circular>>
+
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insertAll(circulars: List<Circular>)
 
+    @Update
+    fun update(circular: Circular)
+
     @Query("DELETE FROM circulars")
     fun deleteAll()
 }

app/src/main/java/net/underdesk/circolapp/fragments/FavouritesFragment.kt

@@ -25,23 +25,29 @@ import android.view.ViewGroup
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProviders
+import androidx.recyclerview.widget.LinearLayoutManager
+import kotlinx.android.synthetic.main.fragment_circular_letters.view.*
 import net.underdesk.circolapp.R
-import net.underdesk.circolapp.viewmodels.CircularLetterViewModel
+import net.underdesk.circolapp.adapters.CircularLetterAdapter
+import net.underdesk.circolapp.viewmodels.FavouritesViewModel
 
 class FavouritesFragment : Fragment() {
 
-    private lateinit var circularLetterViewModel: CircularLetterViewModel
+    private lateinit var favouritesViewModel: FavouritesViewModel
 
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        circularLetterViewModel =
-            ViewModelProviders.of(this).get(CircularLetterViewModel::class.java)
         val root = inflater.inflate(R.layout.fragment_circular_letters, container, false)
-        circularLetterViewModel.circulars.observe(this, Observer {
 
+        root.circulars_list.layoutManager = LinearLayoutManager(context)
+
+        favouritesViewModel =
+            ViewModelProviders.of(this).get(FavouritesViewModel::class.java)
+        favouritesViewModel.circulars.observe(this, Observer {
+            root.circulars_list.adapter = CircularLetterAdapter(it)
         })
         return root
     }

app/src/main/java/net/underdesk/circolapp/viewmodels/FavouritesViewModel.kt

@@ -0,0 +1,30 @@
+/*
+ * Circolapp
+ * Copyright (C) 2019  Matteo Schiff
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.underdesk.circolapp.viewmodels
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.LiveData
+import net.underdesk.circolapp.data.AppDatabase
+import net.underdesk.circolapp.data.Circular
+
+class FavouritesViewModel(application: Application) : AndroidViewModel(application) {
+    val circulars: LiveData<List<Circular>> =
+        AppDatabase.getInstance(getApplication()).circularDao().getFavourites()
+}

app/src/main/res/layout/fragment_favourites.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent">
-
-</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/menu/bottom_nav_menu.xml

@@ -8,7 +8,7 @@
 
     <item
         android:id="@+id/navigation_favourites"
-        android:icon="@drawable/ic_dashboard_black_24dp"
+        android:icon="@drawable/baseline_star_24"
         android:title="@string/title_favourites" />
 
     <item