有没有办法避免重复类似的 TextInputEditText 验证？

Question

片段中有 5 个 TextInputEditText 字段。第一个是字符串，另外 4 个是用户必须输入的双精度值。为确保值有效，检查每个字段是否为空，并检查最后四个（带双精度值）是否为双精度值。

在下面的代码片段中，我删除了最后 2 个 val 和 fun 声明，因为它们与最后 2 个 oes 完全相同，除了 TextInPutLayout 名称（和相应的 val）。

所以，我想知道是否有可能以任何方式缩短它

private val enterTextFoodName = view.findViewById<TextInputLayout>(R.id.enter_food_name)
private val enterTextKcal = view.findViewById<TextInputLayout>(R.id.enter_kcal)
private val enterTextCarbs = view.findViewById<TextInputLayout>(R.id.enter_carbs)
[...]

    private fun validateValues(): Boolean {
        return (!validateFoodName()
                || !validateKcal()
                || !validateCarbs()
                [...])
    }

    private fun validateFoodName(): Boolean {
        return when {
            enterTextFoodName.editText?.text.toString().trim().isEmpty() -> {
                enterTextFoodName.error = getString(R.string.cant_be_empty)
                false
            }
            else -> {
                enterTextFoodName.error = null
                true
            }
        }
    }

    private fun validateKcal(): Boolean {
        return when {
            enterTextKcal.editText?.text.toString().trim().isEmpty() -> {
                enterTextKcal.error = getString(R.string.cant_be_empty)
                false
        }
            enterTextKcal.editText?.text.toString().trim().toDoubleOrNull() == null -> {
                enterTextKcal.error = getString(R.string.invalid_value)
                false
            }
            else -> {
                enterTextKcal.error = null
                true
            }
        }
    }

    private fun validateCarbs(): Boolean {
        return when {
            enterTextCarbs.editText?.text.toString().trim().isEmpty() -> {
                enterTextCarbs.error = getString(R.string.cant_be_empty)
                false
            }
            enterTextCarbs.editText?.text.toString().trim().toDoubleOrNull() == null -> {
                enterTextCarbs.error = getString(R.string.invalid_value)
                false
            }
            else -> {
                enterTextCarbs.error = null
                true
            }
        }
    }

[...]

Answer 1

可以通过Kotlin中的扩展函数实现：

inline fun TextInputLayout.validateInput(messageInvalid: String? = null, checkIfValid: (String?) -> Boolean): Boolean {
    val inputText = editText?.text?.toString()?.trim()
    when {
        inputText.isNullOrEmpty() -> {
            error = context.getString(R.string.cant_be_empty)
        }

        !checkIfValid(inputText) -> {
            error = messageInvalid
        }

        else -> {
            error = null
            return true
        }
    }
    return false
}

那么你可以这样使用它：

val isCarbsValid = enterTextCarbs.validateInput(getString(R.string.invalid_value)) { it?.toDoubleOrNull() != null }

有没有办法避免重复类似的 TextInputEditText 验证？

Is there a way to avoid repetition with similiar TextInputEditText validation?

android

kotlin

android-textinputlayout

android-textinputedittext