android kotlin 小數保留格式化位數

import java.math.RoundingMode
import java.text.NumberFormat
import java.util.*

/**

• 支援設定舍入模式的型別小數
  */
  inline fun Any?.formatDecimalRoundingMode(
  decimalDigits: Int = 2,
  roundingMode: RoundingMode = RoundingMode.HALF_UP,
  failValue: Double = 0.0
  ): String {
  val numberFormat = NumberFormat.getNumberInstance(Locale.getDefault())
  numberFormat.roundingMode = roundingMode
  numberFormat.maximumFractionDigits = decimalDigits
  return try {
  numberFormat.format(this?.toString()?.toDouble())
  .formatDecimalInterruptOrFillMode(decimalDigits)
  } catch (e: NumberFormatException) {
  numberFormat.format(failValue).formatDecimalInterruptOrFillMode(decimalDigits)
  }
  }

/**

• 強模式小數格式化，超長的直接擷取，長度不夠填充0
  */
  inline fun Any?.formatDecimalInterruptOrFillMode(
  decimalPlaces: Int = 2,
  failValue: Double = 0.0
  ): String = try {
  String.format("%.\({decimalPlaces}f", this.toString().toDouble()) } catch (e: NumberFormatException) { String.format("%.\){decimalPlaces}f", failValue)
  }

/**

• 強模式小數格式化，超長的直接擷取，長度不夠填充0
  */
  inline fun Any?.formatDecimal(
  failValue: Double = 0.0
  ): Double = try {
  toString().toDouble()
  } catch (e: NumberFormatException) {
  failValue
  }