我想更改适配器中所选列表项的背景。
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final Card card = getItem(position);
final ViewHolder viewHolder;
if (convertView != null) {
viewHolder = (ViewHolder) convertView.getTag();
} else {
convertView = from(context).inflate(R.layout.card_item, parent, false);
viewHolder = new ViewHolder(convertView);
convertView.setTag(viewHolder);
}
viewHolder.select.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
viewHolder.cardLayout.setBackgroundColor(ContextCompat.getColor(context, R.color.md_grey_600));
}
});
return convertView;
}
private class ViewHolder {
Button select;
RelativeLayout cardLayout;
public ViewHolder(View view) {
select = (Button) view.findViewById(R.id.carditem_btn_upvote);
cardLayout = (RelativeLayout) view.findViewById(R.id.cardlist_item);
}
}
问题是当我选择前。列表的第一项,也选择了第7项。我注意到有一种赞助人。当我选择第二个项目时,也会选择第8个项目,依此类推。
答案 0 :(得分:3)
让'假设您在列表中有10个项目,并且最初您将所有项目颜色存储为白色。
HashMap<Integer,Integer> mhashColorselected=new HashMap();
HashMap<Integer,Integer> mHashBtnVisibility=new HashMap();
for(i=0;i<10;i++){
//Put Default Color of your All list item will be here
mhashColorselected.put(i,R.color.white)
mHashBtnVisibility.put(i,View.Invisible);
}
现在在你的适配器getView();
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final Card card = getItem(position);
final ViewHolder viewHolder;
if (convertView != null) {
viewHolder = (ViewHolder) convertView.getTag();
} else {
convertView = from(context).inflate(R.layout.card_item, parent, false);
viewHolder = new ViewHolder(convertView);
convertView.setTag(viewHolder);
}
viewHolder.select.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
viewHolder.cardLayout.setBackgroundColor(ContextCompat.getColor(context, R.color.md_grey_600));
//Here we are storing Selected item By User
mhashColorselected.put(position,R.color.md_grey_600);
mHashBtnVisibility.put(i,View.Visible);
notifitydataSetChange();
}
});
//Here it's will take fault value or else it will set color as selected item
viewHolder.cardLayout.setBackgroundColor(ContextCompat.getColor(context, mhashColorselected.getValue(position)));
if(View.VISIBLE==mHashBtnVisibility.get(position)){
viewHolder.select.setVisibility(View.VISIBLE)
}else{
viewHolder.select.setVisibility(View.INVISIBLE)
}
return convertView;
}