STEP 4 : display a speaker list in recycler view and implement a fact…

…ory in application to create class dependencies

app/src/main/AndroidManifest.xml

@@ -3,22 +3,22 @@
           package="com.devmind.devoxx">
 
     <application
+            android:name=".DevoxxApplication"
             android:allowBackup="true"
             android:icon="@drawable/logo"
             android:label="@string/app_name"
             android:roundIcon="@drawable/logo"
             android:supportsRtl="true"
             android:theme="@style/AppTheme">
         <activity android:name=".SpeakerListActivity">
+            <meta-data android:name="android.support.PARENT_ACTIVITY" android:value=".MainActivity"/>
         </activity>
         <activity android:name=".SpeakerActivity">
         </activity>
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
-
                 <category android:name="android.intent.category.LAUNCHER"/>
-
                 <action android:name="android.intent.action.VIEW"/>
             </intent-filter>
         </activity>

app/src/main/java/com/devmind/devoxx/DevoxxApplication.kt

@@ -0,0 +1,18 @@
+package com.devmind.devoxx
+
+import android.app.Application
+import androidx.appcompat.app.AppCompatActivity
+import com.devmind.devoxx.model.SpeakerDao
+import com.devmind.devoxx.model.SpeakerService
+
+class DevoxxApplication:Application(){
+
+    val speakerService by lazy{
+        SpeakerService()
+    }
+
+    fun speakerDao() = SpeakerDao(speakerService)
+}
+
+val AppCompatActivity.devoxxApplication
+    get() = this.application as DevoxxApplication

app/src/main/java/com/devmind/devoxx/SpeakerListActivity.kt

@@ -1,11 +1,25 @@
 package com.devmind.devoxx
 
 import android.os.Bundle
+import androidx.recyclerview.widget.DividerItemDecoration
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.devmind.devoxx.model.SpeakerAdapter
+import kotlinx.android.synthetic.main.activity_speaker_list.*
 
 class SpeakerListActivity : MainActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_speaker_list)
+
+        val speakerDao = devoxxApplication.speakerDao()
+
+        speakerList.apply {
+            setHasFixedSize(true)
+            layoutManager = LinearLayoutManager(context)
+            addItemDecoration(DividerItemDecoration(context, DividerItemDecoration.VERTICAL))
+            adapter = SpeakerAdapter()
+            (adapter as SpeakerAdapter).updateData(speakerDao.readAll())
+        }
     }
 }

app/src/main/java/com/devmind/devoxx/model/Speaker.kt

@@ -0,0 +1,53 @@
+package com.devmind.devoxx.model
+
+import java.util.*
+
+
+data class Speaker(
+    val firstname: String,
+    val lastname: String,
+    val country: String = "France",
+    val uuid: String = UUID.randomUUID().toString()
+)
+
+
+class SpeakerService {
+    val speakers = mutableListOf(Speaker("Guillaume", "EHRET"))
+}
+
+interface DaoCrud<T> {
+    // Create
+    fun create(element: T)
+
+    // Read
+    fun readAll(): List<T>
+
+    fun readOne(id: String): T
+
+    // Update
+    fun update(element: T)
+
+    // Delete
+    fun delete(element: T)
+}
+
+class SpeakerDao(private val speakerService: SpeakerService) : DaoCrud<Speaker> {
+
+    override fun create(element: Speaker) {
+        speakerService.speakers.add(element)
+    }
+
+    override fun readAll() = speakerService.speakers
+
+    override fun readOne(id: String): Speaker = speakerService.speakers.first { it.uuid == id }
+
+    override fun update(element: Speaker) {
+        delete(readOne(element.uuid))
+        create(element)
+    }
+
+    override fun delete(element: Speaker) {
+        speakerService.speakers.removeAll { it.uuid == element.uuid }
+    }
+
+}

app/src/main/java/com/devmind/devoxx/model/SpeakerAdapter.kt

@@ -0,0 +1,41 @@
+package com.devmind.devoxx.model
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.recyclerview.widget.RecyclerView
+import com.devmind.devoxx.R
+
+class SpeakerAdapter: RecyclerView.Adapter<SpeakerAdapter.ViewHolder>(){
+
+    private val speakers = mutableListOf<Speaker>()
+
+    class ViewHolder(view: ConstraintLayout): RecyclerView.ViewHolder(view){
+        val name = view.findViewById(R.id.speakerName) as TextView
+        val country = view.findViewById(R.id.speakerCountry) as TextView
+    }
+
+    fun updateData(speakers: List<Speaker>){
+        this.speakers.clear()
+        this.speakers.addAll(speakers)
+        notifyDataSetChanged()
+    }
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val view = LayoutInflater.from(parent.context).inflate(R.layout.activity_speaker_item, parent, false)
+        return ViewHolder(view as ConstraintLayout)
+    }
+
+    override fun getItemCount(): Int = speakers.size
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val speaker = speakers[position]
+        holder.apply {
+            name.text = "${speaker.firstname} ${speaker.lastname}"
+            country.text = speaker.country
+        }
+    }
+
+}
+
+

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

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:tools="http://schemas.android.com/tools"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        tools:context=".SpeakerActivity" android:padding="8dp">
+    <TextView
+            android:text="TextView"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:id="@+id/speakerName" android:textStyle="bold" android:layout_marginTop="8dp"
+            app:layout_constraintTop_toTopOf="parent" android:layout_marginEnd="8dp"
+            app:layout_constraintEnd_toEndOf="parent" android:layout_marginStart="8dp"
+            app:layout_constraintStart_toStartOf="parent"/>
+    <TextView
+            android:text="TextView"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="8dp"
+            android:id="@+id/speakerCountry"
+            app:layout_constraintTop_toBottomOf="@+id/speakerName" app:layout_constraintEnd_toEndOf="parent"
+            android:layout_marginEnd="8dp" android:textAllCaps="true"/>
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -15,4 +15,12 @@
             app:layout_constraintTop_toTopOf="parent" app:layout_constraintStart_toStartOf="parent"
             android:layout_marginStart="8dp" app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
             android:id="@+id/title3"/>
+    <androidx.recyclerview.widget.RecyclerView
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            app:layout_constraintTop_toBottomOf="@+id/title3" app:layout_constraintStart_toStartOf="parent"
+            android:layout_marginStart="8dp" app:layout_constraintEnd_toEndOf="parent" android:layout_marginEnd="8dp"
+            android:layout_marginTop="8dp"
+            app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="8dp"
+            android:id="@+id/speakerList"/>
 </androidx.constraintlayout.widget.ConstraintLayout>