[移动开发]DataBinding 自定义EditeView双向绑定卡死问题解决

addTextChangedListener监听输入变化的时候，会调用自定义的setEditText方法，如此会造成死循环，只能设置flag停止onChange（）的调用，停止后addTextChangedListener方法的循环中断，当判断有新的文本输入时，继续执行文本的设置

@BindingAdapter("android:bindText")
fun setEditText(edit: TextAndEditView, str: String?) {
    if (str == null) {
        return
    }
    edit.editView.setText(str)
    flag = false
    oldCount = 0
}

@InverseBindingAdapter(attribute = "android:bindText", event = "android:contentAttrChanged")
fun getEditText(edit: TextAndEditView): String {
    return edit.editView.text.toString()
}

@BindingAdapter(value = arrayOf("android:contentAttrChanged"))
fun setChangeListener(edit: TextAndEditView, listener: InverseBindingListener?) {
    var simpleTextWatcher: SimpleTextWatcher? = null
    if (listener != null) {
        simpleTextWatcher = SimpleTextWatcher(listener, edit.editView)
    }
    edit.editView.addTextChangedListener(simpleTextWatcher)
}

var flag: Boolean = true
var oldCount: Int = -1

class SimpleTextWatcher : TextWatcher {
    lateinit var edit: EditText
    lateinit var listener: InverseBindingListener

    constructor(listener: InverseBindingListener, edit: EditText) {
        this.listener = listener
        this.edit = edit
    }

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

    }
    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
        edit.setSelection(edit.text.length)
        if (oldCount == 0) {
            oldCount = count
            return
        }
        if (oldCount != 0) {
            flag = true
        }
        if (!flag) {
            return
        }
        listener.onChange()

    }
    override fun afterTextChanged(s: Editable?) {

    }

}