afterTextChanged追加不起作用

Question

text.addOnTextChanged(new TextWatcher() {

  @Override
  public void afterTextChanged(Editable s) {
      if (s.length() == 4 || s.length() == 9 || s.length() == 14) {
          text.append("-");
      }
  }

}

由于某种原因，该代码不起作用。我把它简化为应该是它的核心。理想情况下，您会看到“1234-5678-1234-5678”作为输出，因为我最多需要16位数。我让它与text.setText(s.toString() + "-")一起使用，然后在一个可运行的帖子中，将选择设置为s.length() + 1，但是追加为你处理。此外，在setText生效之前，由于setSelection，您可以告诉光标返回到开头几毫秒。

为什么不起作用？

Answer 1

xml edittext声明中的输入类型不应为＆＃34; number＆＃34;。用这样的数字交换inputType：

android:digits="0123456789 -."

Answer 2

试试这段代码。工作正常

editText.addTextChangedListener（new TextWatcher（）{

        @Override
        public void onTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {

            if (arg2 == 0) {
                if (arg0.length() == 4 || arg0.length() == 9
                        || arg0.length() == 14) {
                    editText.append("-");

                }
            } else {
                if (arg0.length() == 4 || arg0.length() == 9
                        || arg0.length() == 14) {
                    editText.append("");

                }
            }

        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1,
                int arg2, int arg3) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable arg0) {

        }
    });

Answer 3

text.addOnTextChanged(new TextWatcher() {

  @Override
  public void afterTextChanged(Editable s) {
      if (s.length() == 4 || s.length() == 9 || s.length() == 14) {
          s.append("-");
      }
  }

}

Answer 4

private fun setNumberChangeListener(){
    var actionDelete = false
    cardNumber.addTextChangedListener(object : TextWatcher{
        override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
            actionDelete = after == 0
        }

        override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
        }

        override fun afterTextChanged(s: Editable?) {
            s?.let {
                when (it.length) {
                    4, 9, 14 -> {
                        if (!actionDelete)
                            it.append(" ")
                        else
                            it.delete(s.lastIndex, s.lastIndex+1.coerceAtMost(s.lastIndex))
                    }
                    else -> {}
                }
            }
        }
    })
}