如何禁用按钮，直到editText条目填充?

Question

下面是我根据editText条目禁用和启用按钮的代码。这里没有错误，但我的应用程序一直崩溃。有人能帮我一下吗? !

editTextNumberDecimal2.addTextChangedListener (object : TextWatcher1 {
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
TODO("Not yet implemented")
button2.isEnabled = false
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
TODO("Not yet implemented")
button2.isEnabled = s.toString().trim().isNotEmpty()
}
override fun afterTextChanged(s: Editable?) {
TODO("Not yet implemented")
}
})

Answer 1

直接删除这些行:

TODO("Not yet implemented")