Android x Kotlin 實作課程：打造個人專屬計算機 APP EP5 處理按鈕點擊事件

【打造個人專屬計算機 APP】 系列文章目錄：
https://vocus.cc/article/65acea9ffd897800019c13dc

課程摘要

本課程學習如何處理按鈕點擊事件並透過 Logcat 日誌輸出資訊確認按鈕邏輯是否正確。

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範例程式碼

MainActivity.kt

private lateinit var processTextView: TextView
private lateinit var resultTextView: TextView

onCreate

processTextView = binding.processTextView
resultTextView = binding.resultTextVie

//binding.button0.setOnClickListener { ... }
//binding.button1.setOnClickListener { ... }

	val buttons = listOf(
            binding.button0,
            binding.button1,
            binding.button2,
            binding.button3,
            binding.button4,
            binding.button5,
            binding.button6,
            binding.button7,
            binding.button8,
            binding.button9,
            binding.buttonAllClear,
            binding.buttonToggleSign,
            binding.buttonDivide,
            binding.buttonBackspace,
            binding.buttonMultiply,
            binding.buttonMinus,
            binding.buttonPlus,
            binding.buttonEquals,
            binding.buttonDot
        )

  buttons.forEach { button ->
      button.setOnClickListener { onButtonClick(button) }
  }
}

onButtonClick

fun onButtonClick(button: Button) {
    // 獲取按鈕的文字或其他相關屬性
    val buttonText = button.text.toString()

    Log.d("HKT","buttonText: $buttonText")
}

最後完成

class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding
    private lateinit var processTextView: TextView
    private lateinit var resultTextView: TextView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        processTextView = binding.processTextView
        resultTextView = binding.resultTextView

        val buttons = listOf(
            binding.button0,
            binding.button1,
            binding.button2,
            binding.button3,
            binding.button4,
            binding.button5,
            binding.button6,
            binding.button7,
            binding.button8,
            binding.button9,
            binding.buttonAllClear,
            binding.buttonToggleSign,
            binding.buttonDivide,
            binding.buttonBackspace,
            binding.buttonMultiply,
            binding.buttonMinus,
            binding.buttonPlus,
            binding.buttonEquals,
            binding.buttonDot
        )
        buttons.forEach { button ->
            button.setOnClickListener { onButtonClick(button) }
        }
    }

    private fun onButtonClick(button: AppCompatButton) {
        val buttonText = button.text.toString()
        Log.d("HKT","buttonText: $buttonText")
    }
}