Android Adapter中组件EditText文本变化监听 addTextChangedListener

问题背景：使用适配器显示一个列表，列表中Item中有EditText，滚动时会有EditText组件内容消失

步骤：

1. 在Adapter中，添加interface

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public interface OnEidtTextChangeListener {         void xxxTextChanged(CharSequence s, int start, int before, int count);         void getXxxEditedCount(); }   private OnEidtTextChangeListener mOnEidtTextChangeListener;   public void setOnEidtTextChangeListener(OnEidtTextChangeListener mOnEidtTextChangeListener) {         this.mOnEidtTextChangeListener = mOnEidtTextChangeListener; }

2. 在XXXAdapter类中 实现自定义TextWatcher，

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class XXXEditTextWatcher implements TextWatcher {           private XXXAdapter.ItemViewHolder holder;         //传入对应的ViewHolder         public XXXEditTextWatcher(XXXAdapter.ItemViewHolder holder) {                 this.holder = holder;         }           @Override         public void onTextChanged(CharSequence s, int start, int before, int count) {                 if (mOnEidtTextChangeListener != null) {                         mOnEidtTextChangeListener.xxxTextChanged(s, start, before, count);                 }         }           @Override         public void beforeTextChanged(CharSequence s, int start, int count, int after) {           }           @Override         public void afterTextChanged(Editable editable) {                 //通过ViewHolder，获取对应控件设置的tag，tag为当前的位置，即数据的position，获取适配器的数据list改变 XXX 的内容                 int position = (Integer) holder.etXXX.getTag();                 if (mList.size() > position) {                         mList.get(position).setXXX(editable.toString());                 }                 // 获取当前显示的item的index                 if (mList.size() > 0) {                         if (mOnEidtTextChangeListener != null) {                                 mOnEidtTextChangeListener.getXxxEditedCount();                         }                 }         } }

3. 在onBindViewHolder中，组件设定tag以便于后续获取position，

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holder.etXXX.setTag(position); holder.etXXX.setText(mList.get(position).getXxx()); holder.etXXX.addTextChangedListener(new XXXEditTextWatcher(holder));