質問編集履歴
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ソースコードを追記しました
test
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test
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@@ -15,3 +15,141 @@
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私はKotlin初心者なので何がなにやらサッパリ分からなくて困っております。どなたか助言をお願い致します。
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```Kotlin
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package com.example.stopwatch
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import android.support.v7.app.AppCompatActivity
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import android.os.Bundle
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import android.os.Handler
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class MainActivity : AppCompatActivity() {
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val handler = Handler()
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var timeValue = 0
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_main)
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// View要素を変数に代入(配置したビュー要素にアクセス)
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val timeText = findViewById(R.id.timeText) as TextView
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val startButton = findViewById(R.id.start) as Button
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val stopButton = findViewById(R.id.stop) as Button
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val resetButton = findViewById(R.id.reset) as Button
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val runnable = object : Runnable {
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override fun run() {
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timeValue++
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timeToText(timeValue)?.let {
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timeText.text = it
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}
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handler.postDelayed(this, 1000)
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}
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}
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startButton.setOnClickListener {
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handler.post(runnable)
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}
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stopButton.setOnClickListener {
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handler.removeCallbacks(runnable)
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}
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resetButton.setOnClickListener {
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handler.removeCallbacks(runnable)
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timeValue = 0
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timeToText()?.let {
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timeText.text = it
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}
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}
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}
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private fun timeToText(time: Int = 0): String? {
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return if (time < 0) {
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null
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} else if (time == 0) {
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"00:00:00"
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} else {
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val h = time / 3600
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val m = time % 3600 / 60
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val s = time % 60
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"%1$02d:%2$02d:%3$02d".format(h, m, s)
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}
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}
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}
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```
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