Question

我想为几个TextWatcher写EditText。在任何一个中，我都想将EditText的值赋给一个变量。像这样：

var variable: String? = null

private inner class CodeTextWatcher : TextWatcher {
    override fun afterTextChanged(s: Editable?) {
        variable = s?.toString()
    }

    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
    }

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

对于几个EditText，我想写一些类似的东西：

private inner class CodeTextWatcher(private val method: (String?) -> Unit) : TextWatcher {
    override fun afterTextChanged(s: Editable?) {
        method(s?.toString())
    }

    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
    }

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

并调用它：

textWatcher1 = CodeTextWatcher {variable1 = s}
textWatcher2 = CodeTextWatcher {variable2 = s}

但是我不能在这里写s，并且想从s访问afterTextChanged(s: Editable?)。有可能吗？

Answer 1

您尝试过吗：

textWatcher1 = CodeTextWatcher { s -> variable1 = s }
textWatcher2 = CodeTextWatcher { s -> variable2 = s }

或者在这种情况下，甚至

textWatcher1 = CodeTextWatcher { variable1 = it }
textWatcher2 = CodeTextWatcher { variable2 = it }

？

在Kotlin中具有参数的Lambda

1 个答案: