适用于ListView的Android替代颜色是随机的

概述我试图为列表视图设置替代背景颜色,并在每次开始该活动时随机设置背景颜色.阵列适配器publicclassPlacesListAdapterextendsArrayAdapter<Place>implementsFilterable{publicContextcontext;privateList<Place>orig,itemDetailsrrayList;pri

我试图为列表视图设置替代背景颜色,并在每次开始该活动时随机设置背景颜色.

阵列适配器

public class Placeslistadapter extends ArrayAdapter<Place> implements        Filterable {    public Context context;    private List<Place> orig, itemDetailsrrayList;    private PlaceFilter filter;    public Placeslistadapter(Context context, int textVIEwResourceID) {        super(context, textVIEwResourceID);    }    public Placeslistadapter(Context context, int resource, List<Place> places) {        super(context, resource, places);        this.context = context;        // this.places = places;        itemDetailsrrayList = places;        orig = new ArrayList<Place>(itemDetailsrrayList);        filter = new PlaceFilter();        // imageLoader = new ImageLoader(context.getApplicationContext());    }    public int getCount() {        return itemDetailsrrayList.size();    }    public Place getItem(int position) {        return itemDetailsrrayList.get(position);    }    public long getItemID(int position) {        return position;    }    @OverrIDe    public VIEw getVIEw(int position, VIEw convertVIEw, VIEwGroup parent) {        VIEwHolder holder;        // VIEw vIEw = convertVIEw;        // Place p = places.get(position);        if (convertVIEw == null) {            LayoutInflater vIEwInflater;            vIEwInflater = LayoutInflater.from(getContext());            convertVIEw = vIEwInflater.inflate(R.layout.List_item_place, null);            holder = new VIEwHolder();            holder.placeTitle = (TextVIEw) convertVIEw                    .findVIEwByID(R.ID.place_Title);            holder.placedistance = (TextVIEw) convertVIEw                    .findVIEwByID(R.ID.place_distance);            holder.placecategoryIcon = (ImageVIEw) convertVIEw                    .findVIEwByID(R.ID.place_category_icon);            // Setting Alternative Row colors            if (position % 2 == 0) {                convertVIEw                        .setBackgroundResource(R.drawable.List_vIEw_place_row_1);            } else {                convertVIEw                        .setBackgroundResource(R.drawable.List_vIEw_place_row_2);            }            convertVIEw.setTag(holder);        } else {            holder = (VIEwHolder) convertVIEw.getTag();        }        holder.placeTitle.setText(itemDetailsrrayList.get(position)                .getPlaceTitle());        holder.placedistance.setText("200");        holder.placecategoryIcon.setimageResource(R.drawable.icon_category);        return convertVIEw;    }    static class VIEwHolder {        TextVIEw placeID;        TextVIEw placeTitle;        TextVIEw placedistance;        ImageVIEw placecategoryIcon;    }    @OverrIDe    public Filter getFilter() {        // Todo auto-generated method stub        return filter;    }    private class PlaceFilter extends Filter {        @OverrIDe        protected FilterResults performFiltering(CharSequence constraint) {            FilterResults oReturn = new FilterResults();            ArrayList<Place> results = new ArrayList<Place>();            if (orig == null)                orig = itemDetailsrrayList;            if (constraint != null) {                if (orig != null && orig.size() > 0) {                    for (Place g : orig) {                        if (g.getPlaceTitle()                                .tolowerCase()                                .startsWith(constraint.toString().tolowerCase()))                            results.add(g);                    }                }                oReturn.values = results;            }            return oReturn;        }        @SuppressWarnings("unchecked")        @OverrIDe        protected voID publishResults(CharSequence constraint,                FilterResults results) {            itemDetailsrrayList = (ArrayList<Place>) results.values;            notifyDataSetChanged();        }    }}

XML

<?xml version="1.0" enCoding="utf-8"?><selector xmlns:androID="http://schemas.androID.com/apk/res/androID">    <item androID:drawable="@color/List_vIEw_place_row_1" androID:state_pressed="false" androID:state_selected="false"/>    <item androID:drawable="@color/List_vIEw_place_selected" androID:state_pressed="true" androID:state_selected="false"/>    <item androID:drawable="@color/List_vIEw_place_selected" androID:state_pressed="false" androID:state_selected="true"/>    <item androID:drawable="@androID:color/transparent"/></selector>

解决方法:

在返回convertVIEw之前,请根据需要设置背景.
在返回convertVIEw之前使用此行

 if (position % 2 == 0) { convertVIEw .setBackgroundResource(R.drawable.List_vIEw_place_row_1); } else { convertVIEw .setBackgroundResource(R.drawable.List_vIEw_place_row_2); } return convertVIEw; 

我不确定伙伴,但我认为它将首次进入(convertVIEw == null).之后你调用holder =(VIEwHolder)convertVIEw.getTag();然后它请求视图,它具有前一个位置背景颜色.这就是为什么你得到那个输出

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