Data binding Kotlin双向绑定自定义视图

我有一个扩展ConstraintLayout的自定义视图，其中包含1个EditText和2个TextView

在自定义视图中，我定义此属性（以及其他属性）：

在自定义视图中，我定义：

  companion object {
    @JvmStatic @BindingAdapter("Text")
    fun setText(nMe : View, nText: String) {
        nMe.nInput.setText(nText)
    }
    @InverseBindingAdapter(attribute = "Text")
    fun getText(nMe : View) : String {
      return  nMe.nInput.text.toString()
    }

witch在单向绑定中工作良好

app:Text="@{login.email}"

但是当我尝试在双向绑定中使用它时，我得到了指向ActivityLoginBinding.java.lang.String callbackArg_0=mBindingComponent.null.getText（mEmail）的错误

如何获得双向绑定

L.E：经过一些研究，我得出以下结论：

@InverseBindingMethods(InverseBindingMethod(type = 
CustomInput::class,attribute = "bind:Text",event = 
"bind:textAttrChanged",method = "bind:getText"))
class CustomEditTextBinder {
companion object {
    @JvmStatic
    @BindingAdapter(value = ["textAttrChanged"])
    fun setListener(editText: CustomInput, listener: InverseBindingListener?) {
        if (listener != null) {
            editText.nInput.addTextChangedListener(object : TextWatcher {
                override fun beforeTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {

                }

                override fun onTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {

                }

                override fun afterTextChanged(editable: Editable) {
                    listener.onChange()
                }
            })
        }
    }

    @JvmStatic
    @InverseBindingAdapter(attribute = "Text")
    fun getText(nMe: CustomInput): String {
        return nMe.nInput.text.toString()
    }

    @JvmStatic
    @BindingAdapter("Text")
    fun setText(editText: CustomInput, text: String?) {
        text?.let {
            if (it != editText.nInput.text.toString()) {
                editText.nInput.setText(it)
            }
        }
    }
}

}

但现在我明白了：

---

找不到事件TextAttrChanged

我想您需要的只是

event=“android:TextAttrChanged”

这对我适用（如果文本为0，则将文本设置为空

String

）：

---

您是否尝试使用@InverseBindingMethods（InverseBindingMethod（event=“android:textAttrChanged”）。。。在你的反演方法中

app:Text="@{login.email}"

@InverseBindingMethods(InverseBindingMethod(type = 
CustomInput::class,attribute = "bind:Text",event = 
"bind:textAttrChanged",method = "bind:getText"))
class CustomEditTextBinder {
companion object {
    @JvmStatic
    @BindingAdapter(value = ["textAttrChanged"])
    fun setListener(editText: CustomInput, listener: InverseBindingListener?) {
        if (listener != null) {
            editText.nInput.addTextChangedListener(object : TextWatcher {
                override fun beforeTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {

                }

                override fun onTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {

                }

                override fun afterTextChanged(editable: Editable) {
                    listener.onChange()
                }
            })
        }
    }

    @JvmStatic
    @InverseBindingAdapter(attribute = "Text")
    fun getText(nMe: CustomInput): String {
        return nMe.nInput.text.toString()
    }

    @JvmStatic
    @BindingAdapter("Text")
    fun setText(editText: CustomInput, text: String?) {
        text?.let {
            if (it != editText.nInput.text.toString()) {
                editText.nInput.setText(it)
            }
        }
    }
}

object DataBindingUtil {
    @BindingAdapter("emptyIfZeroText")
    @JvmStatic
    fun setText(editText: EditText, text: String?) {
        if (text == "0" || text == "0.0") editText.setText("") else editText.setText(text)
    }

    @InverseBindingAdapter(attribute = "emptyIfZeroText", event = "android:textAttrChanged")
    @JvmStatic
    fun getText(editText: EditText) = editText.text.toString()
}