Android 优雅的实现通用格式化编辑

<androidx.appcompat.widget.AppCompatEditText
 android:id="@+id/etPhone"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:inputType="number" />

// format is ' '
etPhone.setFormatRules(3, 4, 4)

// format is '-'
etPhone.setFormatRules(3, 4, 4, formatChar = '-')

<androidx.appcompat.widget.AppCompatEditText
 android:id="@+id/etIDNumber"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:digits="@string/digits_id_number"/>

<string name="digits_id_number">0123456789xX</string>

etIDNumber.setFormatRules(6, 4, 4, 4)

etPhone.setOnFormatEditListener { isComplete, text ->
 if (isComplete) { // 编辑完成
  // 使用 toast 显示移除格式化的文本
  Toast.makeText(this, text, Toast.LENGTH_SHORT).show()
 }
}

etPhone.textWithFormatRemoved

var formatChar: Char = ' '

val formatCharIndexList = ArrayList<Int>()

override fun afterTextChanged(s: Editable?) {
 val value = s?.toString() ?: return
 if (value.isEmpty()) return
 
 if (value.last() == formatChar) {
  deleteChar(s, value.lastIndex)
  return
 }
 
 value.forEachIndexed { index, c ->
  if (formatCharIndexList.contains(index)) {
   if (c != formatChar) {
    insertFormatChar(s, index)
    return
   }
  } else {
   if (c == formatChar) {
    deleteChar(s, index)
    return
   }
  }
 }
 ...
}