Add base viewmodel and recyclerview adapter logic

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

@@ -0,0 +1,32 @@
+package net.underdesk.circolapp.adapters
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+import kotlinx.android.synthetic.main.item_circular.view.*
+import net.underdesk.circolapp.R
+import net.underdesk.circolapp.data.Circular
+
+
+class CircularLetterAdapter(private val circulars: List<Circular>) :
+    RecyclerView.Adapter<CircularLetterAdapter.CircularLetterViewHolder>() {
+
+    inner class CircularLetterViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        var title: TextView = view.circular_title_textview
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CircularLetterViewHolder {
+        val itemView = LayoutInflater.from(parent.context)
+            .inflate(R.layout.item_circular, parent, false)
+
+        return CircularLetterViewHolder(itemView)
+    }
+
+    override fun onBindViewHolder(holder: CircularLetterViewHolder, position: Int) {
+        holder.title.text = circulars[position].name
+    }
+
+    override fun getItemCount() = circulars.size
+}

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

@@ -23,7 +23,7 @@ import androidx.room.PrimaryKey
 
 @Entity(tableName = "circulars")
 data class Circular(
-    @PrimaryKey(autoGenerate = true) val id: Long,
+    @PrimaryKey(autoGenerate = true) val id: Long?,
     val name: String,
     val url: String
 )

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

@@ -18,7 +18,6 @@
 
 package net.underdesk.circolapp.data
 
-import androidx.lifecycle.LiveData
 import androidx.room.Dao
 import androidx.room.Insert
 import androidx.room.OnConflictStrategy
@@ -27,8 +26,11 @@ import androidx.room.Query
 @Dao
 interface CircularDao {
     @Query("SELECT * FROM circulars")
-    fun getCirculars(): LiveData<List<Circular>>
+    fun getCirculars(): List<Circular>
 
     @Insert(onConflict = OnConflictStrategy.REPLACE)
-    suspend fun insertAll(circulars: List<Circular>)
+    fun insertAll(circulars: List<Circular>)
+
+    @Query("DELETE FROM circulars")
+    fun deleteAll()
 }

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

@@ -25,7 +25,10 @@ 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.adapters.CircularLetterAdapter
 import net.underdesk.circolapp.viewmodels.CircularLetterViewModel
 
 class CircularLetterFragment : Fragment() {
@@ -37,11 +40,14 @@ class CircularLetterFragment : Fragment() {
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
+        val root = inflater.inflate(R.layout.fragment_circular_letters, container, false)
+
+        root.circulars_list.layoutManager = LinearLayoutManager(context)
+
         circularLetterViewModel =
             ViewModelProviders.of(this).get(CircularLetterViewModel::class.java)
-        val root = inflater.inflate(R.layout.fragment_circular_letters, container, false)
-        circularLetterViewModel.text.observe(this, Observer {
-
+        circularLetterViewModel.circulars.observe(this, Observer {
+            root.circulars_list.adapter = CircularLetterAdapter(it)
         })
         return root
     }

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

@@ -40,7 +40,7 @@ class FavouritesFragment : Fragment() {
         circularLetterViewModel =
             ViewModelProviders.of(this).get(CircularLetterViewModel::class.java)
         val root = inflater.inflate(R.layout.fragment_circular_letters, container, false)
-        circularLetterViewModel.text.observe(this, Observer {
+        circularLetterViewModel.circulars.observe(this, Observer {
 
         })
         return root

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

@@ -40,7 +40,7 @@ class RemindersFragment : Fragment() {
         circularLetterViewModel =
             ViewModelProviders.of(this).get(CircularLetterViewModel::class.java)
         val root = inflater.inflate(R.layout.fragment_circular_letters, container, false)
-        circularLetterViewModel.text.observe(this, Observer {
+        circularLetterViewModel.circulars.observe(this, Observer {
 
         })
         return root

app/src/main/java/net/underdesk/circolapp/server/DataFetcher.kt

@@ -19,6 +19,7 @@
 package net.underdesk.circolapp.server
 
 import com.google.gson.Gson
+import net.underdesk.circolapp.data.Circular
 import net.underdesk.circolapp.server.pojo.Response
 import org.jsoup.Jsoup
 import java.io.IOException
@@ -33,16 +34,16 @@ class DataFetcher {
     }
 
     @Throws(IOException::class)
-    fun getCircularsFromServer(): ArrayList<Pair<String, String>> {
+    public fun getCircularsFromServer(): List<Circular> {
         val json = gson.fromJson(retrieveDataFromServer(), Response::class.java)
 
         val document = Jsoup.parseBodyFragment(json.content!!.rendered)
         val htmlList = document.getElementsByTag("ul")[0].getElementsByTag("a")
 
-        val list = ArrayList<Pair<String, String>>()
+        val list = ArrayList<Circular>()
 
         htmlList.forEach { element ->
-            list.add(Pair(element.text(), element.attr("href")))
+            list.add(Circular(null, element.text(), element.attr("href")))
         }
 
         return list

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

@@ -18,14 +18,41 @@
 
 package net.underdesk.circolapp.viewmodels
 
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
-import androidx.lifecycle.ViewModel
+import net.underdesk.circolapp.data.AppDatabase
+import net.underdesk.circolapp.data.Circular
+import net.underdesk.circolapp.server.DataFetcher
 
-class CircularLetterViewModel : ViewModel() {
+class CircularLetterViewModel(application: Application) : AndroidViewModel(application) {
 
-    private val _text = MutableLiveData<String>().apply {
-        value = ""
+    private val _circulars: MutableLiveData<List<Circular>> by lazy {
+        MutableLiveData<List<Circular>>().also {
+            loadCirculars()
+        }
+    }
+
+    val circulars: LiveData<List<Circular>> = _circulars
+
+    private fun loadCirculars() {
+        object : Thread() {
+            override fun run() {
+                _circulars.postValue(AppDatabase.getInstance(getApplication()).circularDao().getCirculars())
+                updateCirculars()
+            }
+        }.start()
+    }
+
+    private fun updateCirculars() {
+        val fetcher = DataFetcher()
+
+        val newCirculars = fetcher.getCircularsFromServer()
+        if (newCirculars.size != _circulars.value?.size ?: true) {
+            _circulars.postValue(newCirculars)
+            AppDatabase.getInstance(getApplication()).circularDao().deleteAll()
+            AppDatabase.getInstance(getApplication()).circularDao().insertAll(newCirculars)
+        }
     }
-    val text: LiveData<String> = _text
 }