Kotlin First App


Code

Post #93

FR

Kotlin First App

Friday, 21 August 2020 11:29:48 by Khodok

2 min read

Code for TimeFighter

Kotlin
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package ch.ceff.android.timefighter

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.os.CountDownTimer
import android.widget.Button
import android.widget.TextView
import android.widget.Toast

class MainActivity : AppCompatActivity() {
    /// lateinit -> je m'en occuperai plus tard
    private lateinit var gameScoreTextView: TextView
    private lateinit var timeLeftTextView: TextView
    private lateinit var tapMeButton: Button

    private var score = 0

    /// Timer
    private var gameStarted = false /// Le jeu est démarré ?
    private lateinit var countDownTimer: CountDownTimer
    private var initialCountdown: Long = 60000 /// 60s
    private var countDownInterval: Long = 1000 /// 1s
    private var timeLeft = 60

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main) /// Inflate

        /// Connexion aux variables
        gameScoreTextView = findViewById(R.id.game_score_text_view)
        timeLeftTextView = findViewById(R.id.time_left_text_view)
        tapMeButton = findViewById(R.id.tap_me_button)

        /// Ajout d'un gestionnaire sur le bouton
        tapMeButton.setOnClickListener { incrementScore() }

        resetGame()
    }

    private fun incrementScore() {
        if (!gameStarted) {
            startGame()
        }

        score++

        /// val = value = constante dans cette partie de code
        val newScore = /* value --> constante */ getString(R.string.game_score_text_view, score)
        gameScoreTextView.text = newScore
    }

    private fun resetGame() {
        score = 0

        val initialScore = getString(R.string.game_score_text_view, score)
        gameScoreTextView.text = initialScore

        val initialTimeLeft = getString(R.string.time_left_text_view, 60)
        timeLeftTextView.text = initialTimeLeft

        /// Définition d'un objet anonyme : object : Constructeur()
        /// CountDownTimer on doit redéfinir onTick() et onFinish()
        countDownTimer = object : CountDownTimer(initialCountdown, countDownInterval) {

            /// Lors de chaque interval du compteur
            /// La méthode reçoit le temps résiduel
            override fun onTick(millisUntilFinished: Long) {
                timeLeft = millisUntilFinished.toInt() / 1000

                val timeLeftString = getString(R.string.time_left_text_view, timeLeft)
                timeLeftTextView.text = timeLeftString
            }

            /// Lorsque le timer arrive à 0
            override fun onFinish() {
                endGame()
            }
        }

        gameStarted = false
    }

    private fun startGame() {
        countDownTimer.start()
        gameStarted = true
    }

    private fun endGame() {
        Toast.makeText(this, getString(R.string.game_over_message, score), Toast.LENGTH_LONG).show()
        resetGame()
    }
}
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