自定义Adapter实现无限存余
继承无限循环adapter 重写实现有限adapter
背景
问题
- 当前存在的adapter为无限循环式 而当前需要显示的仅仅只是其中一部分数据信息 不想直接复制原先ViewHoloder以及onBindView内的数据
思路
- 重写getItemCount()以及onBindViewHolder方法
- 原先ViewHolder类中通过泛型获取控件ID以及通过ID设置文字以及图片等功能
实现
继承原适配器 重写方法
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| public class MLiveAdapter extends LiveAdapter {
private List<live> liveList;
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
live = liveList.get(position);
holder.setImageRes(R.id.iv_live_icon, live.getImageId());
//省略...
holder.setText(R.id.tv_live_trade_name, live.getTradeName());
holder.getView(R.id.l1_live_bg).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//省略...
}
});
super.onBindViewHolder(holder, position);
}
public MLiveAdapter(List<live> liveList) {
super(liveList);
this.liveList = liveList;
}
@Override
public int getItemCount() {
return liveList.size();
}
}
|
获取ID 设置文字以及图片
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| protected static class ViewHolder extends RecyclerView.ViewHolder {
ImageView image;
TextView TradeName;
LinearLayout liBg;
View mConvertView;
//省略...
SparseArray<View> mViews;
public ViewHolder(View view) {
super(view);
//省略...
image = view.findViewById(R.id.iv_live_icon);
TradeName = view.findViewById(R.id.tv_live_trade_name);
liBg = view.findViewById(R.id.l1_live_bg);
mViews = new SparseArray<View>();
mConvertView=view;
}
public <T extends View> T getView(int viewId) {
View view = mViews.get(viewId);
if (view == null) {
view = mConvertView.findViewById(viewId);
mViews.put(viewId, view);
}
return (T) view;
}
public ViewHolder setText(int viewId, String text) {
TextView tv = getView(viewId);
tv.setText(text);
return this;
}
public ViewHolder setImageRes(int viewID, int resId) {
ImageView iv = getView(viewID);
iv.setImageResource(resId);
return this;
}
}
|
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