It starts to look like something

app/src/main/java/adrienmalin/pingpoints/Dialog.kt

@@ -16,7 +16,7 @@ class Dialog : DialogFragment() {
                 .setPositiveButton(R.string.go, DialogInterface.OnClickListener { dialog, id ->
                     // FIRE ZE MISSILES!
                 })
-                .setNegativeButton(R.string.cancel, DialogInterface.OnClickListener { dialog, id ->
+                .setNegativeButton(R.string.quit, DialogInterface.OnClickListener { dialog, id ->
                     // User cancelled the dialog
                 })
                 .setView(view)

app/src/main/java/adrienmalin/pingpoints/MainActivity.kt

@@ -2,19 +2,94 @@ package adrienmalin.pingpoints
 
 import android.support.v7.app.AppCompatActivity
 import android.os.Bundle
+import android.view.View
+import android.widget.Button
 
 
 class MainActivity : AppCompatActivity() {
+    var players: Array<Player> = arrayOf(
+            Player(),
+            Player()
+    )
+    var server: Int = 0
+    var notServer: Int = 1
+
+    var buttonPlayers: Array<Button> = emptyArray()
+    var serviceTexts: Array<Array<String>> = arrayOf(
+            arrayOf("""_o/°""", ""),
+            arrayOf("", """°\o_""")
+    )
+
+    var textScore: android.widget.TextView? = null
+    var textService: android.widget.TextView? = null
+    var stringScore:String = ""
+    var stringService:String = ""
+
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        val names: Array<String> = resources.getStringArray(R.array.players_names)
+        for ((player, name) in players.zip(names)) {
+            player.name = name
+        }
+
+        textScore = findViewById(R.id.textScore)
+        textService = findViewById(R.id.textService)
+
+        stringScore = getString(R.string.score)
+        stringService = getString(R.string.service)
+
+
+        buttonPlayers = arrayOf(
+                findViewById(R.id.buttonPlayer1),
+                findViewById(R.id.buttonPlayer2)
+        )
+
+        update_ui()
     }
 
+    fun updateScore(scoringPlayerId: Int) {
+        players[scoringPlayerId].score ++
 
-    val joueurs: Array<Joueur> = arrayOf(Joueur(getString(R.string.nom_joueur_1)), Joueur(getString(R.string.nom_joueur_2)))
-    val serveur: Int? = null
+        if (players.sumBy { it.score } % 2 == 0) {
+            server = notServer.also { notServer = server }
+        }
+
+        update_ui()
+    }
+
+    fun onClickPlayer1(view: View) {
+        updateScore(0)
+    }
+
+    fun onClickPlayer2(view: View) {
+        updateScore(1)
+    }
+
+    fun update_ui(){
+
+        textScore?.text = "$stringScore ${players[server].score} - ${players[notServer].score}"
+
+        textService?.text = "$stringService ${players[server].name}"
+
+        for ((player, serviceText) in players.zip(serviceTexts[server])) {
+            player.serviceText = serviceText
+        }
+
+        for ((button, player) in buttonPlayers.zip(players)) {
+            button.text = """
+                    |${player.name}
+                    |${player.score}
+                    |${player.serviceText}""".trimMargin()
+        }
+    }
 
 }
 
-class Joueur(nom: String, score: Int = 0)
+class Player(
+    var name: String = "",
+    var score: Int = 0,
+    var serviceText: String = ""
+)