RecyclerView Adapter中EditText监听文

adapter中每一个item都有一个EditText 但是需要每一个EditText添加TextWatcher。一旦你在原来的基础上 新增一个item 就会导致前面的EditText会监听到新增的EditText输入。结果就是输入值会错乱。
解决思路：就是每次给Item设置tag 一旦item被移除就移除removeTextChangedListener 监听。保证只有一个EditText监听输入。

代码核心如下，BaseQuickAdapter 大家搜索一下就知道了

class AddProductAdapter :
    BaseQuickAdapter<AddProductResModel, BaseViewHolder>(R.layout.item_add_product) {

    override fun onViewDetachedFromWindow(holder: BaseViewHolder) {
        super.onViewDetachedFromWindow(holder)

        val etNum = holder.getView<AppCompatEditText>(R.id.et_num)
        if (etNum != null && etNum.tag is TextWatcher) {
            etNum.removeTextChangedListener(etNum.tag as TextWatcher)
        }
    }

    override fun convert(helper: BaseViewHolder, item: AddProductResModel) {
        val tvSelect = helper.getView<AppCompatTextView>(R.id.tv_select)
        val etNum = helper.getView<AppCompatEditText>(R.id.et_num)
        etNum.requestFocus()
        if (TextUtils.isEmpty(item.name)) {
            tvSelect.text = "请选择项目"
        } else {
            tvSelect.text = item.name
        }
        if (TextUtils.isEmpty(item.value)) {
            etNum.setText("1")
        } else {
            etNum.setText(item.value)
        }
        if (etNum.tag is TextWatcher) {
            etNum.removeTextChangedListener(etNum.getTag() as TextWatcher)
        }
        val textWatcher = object : TextWatcher {
            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
            }

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

            }

            override fun afterTextChanged(s: Editable?) {
                item.value = s.toString()
            }
        }
        etNum.addTextChangedListener(textWatcher)
        etNum.tag = textWatcher

        helper.addOnClickListener(R.id.ll_project)
        helper.addOnClickListener(R.id.rl_delete)

    }

public class AddProductResModel {
    public String code;
    public String name;
    public String value;
}