Android Listview多布局实现以及其复用错乱问题

Listview  Adapter的getView方法 @Override public Object getItem(int position) { return mlist.get(position); } // 最好也重写该方法 布局类型的数量 @Override public int getViewTypeCount() { return 4; } // 重写该方法即可避免ClassCastExcepiton 返回该布局类型必须从0开始 @Override public int getItemViewType(int position) { int type = mlist.get(position).getType(); return type; } @Override public View getView(int position, View convertView, ViewGroup parent) { DataBean dataBean = (DataBean) getItem(position); int type = getItemViewType(position); ViewHolder1 holder1 = null; ViewHolder2 holder2 = null; ViewHolder3 holder3 = null; ViewHolder4 holder4 = null; if (convertView == null) { inflater = LayoutInflater.from(mContext); // 按当前所需的样式，确定new的布局 switch (type) { case TYPE_1: convertView = inflater.inflate(R.layout.lv_information_item, parent, false); holder1 = new ViewHolder1(convertView); convertView.setTag(holder1); break; case TYPE_2: convertView = inflater.inflate(R.layout.lv_information_video_item, parent, false); holder2 = new ViewHolder2(convertView); convertView.setTag(holder2); break; case TYPE_3: convertView = inflater.inflate(R.layout.lv_information_activite_item, parent, false); holder3 = new ViewHolder3(convertView); convertView.setTag(holder3); break; case TYPE_4: convertView = inflater.inflate(R.layout.lv_information_live_video_item, parent, false); holder4 = new ViewHolder4(convertView); convertView.setTag(holder4); break; default: break; } } else { switch (type) { case TYPE_1: holder1 = (ViewHolder1) convertView.getTag(); break; case TYPE_2: holder2 = (ViewHolder2) convertView.getTag(); break; case TYPE_3: holder3 = (ViewHolder3) convertView.getTag(); break; case TYPE_4: holder4 = (ViewHolder4) convertView.getTag(); break; } } switch (type) { case TYPE_1: showHolder1(holder1, dataBean); break; case TYPE_2: showHolder2(holder2, dataBean); break; case TYPE_3: showHolder3(holder3, dataBean); break; case TYPE_4: showHolder4(holder4, dataBean); break; } return convertView; } void showHolder1(ViewHolder1 viewHolder, final DataBean dataBean) { // 将数据显示到控件上 } void showHolder2(ViewHolder2 viewHolder, final DataBean dataBean) { // 将数据显示到控件上 } void showHolder3(ViewHolder3 viewHolder, final DataBean dataBean) { // 将数据显示到控件上 } void showHolder4(ViewHolder4 viewHolder, final DataBean dataBean) { // 将数据显示到控件上 } public class ViewHolder1 { // 控件初始化 @Bind(R.id.type1) TextView type1; ViewHolder1(View view) { ButterKnife.bind(this, view); } } public class ViewHolder2 { // 控件初始化 @Bind(R.id.type2) TextView type2; ViewHolder2(View view) { ButterKnife.bind(this, view); } } public class ViewHolder3 { // 控件初始化 @Bind(R.id.type3) TextView type3; ViewHolder3(View view) { ButterKnife.bind(this, view); } } public class ViewHolder4 { // 控件初始化 @Bind(R.id.type4) TextView type4; ViewHolder4(View view) { ButterKnife.bind(this, view); } } }

这样就实现了多布局以及复用，但是如果不重写getItemViewType方法会发生ClassCastException的错误

所以重写getItemViewType方法避免问题，具体原因不太清楚