利用sharePrefences记录被点击的ListView

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点击过的ListVIew 被记录，并把title变为灰色

效果图：

1 封装SharePrefences:

/* * 封装sharePreferences  */public class PreferenceUtils {public final static String PREF_NAME="config";public static String getString(Context ctx,String key,String defaultValue){SharedPreferences sp=ctx.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);return sp.getString(key, defaultValue);}public static void SetString(Context ctx,String key,String defaultValue){SharedPreferences sp=ctx.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);sp.edit().putString(key, defaultValue).commit();}}

2 添加listView监听：

lv_tablist.setOnItemClickListener(new OnItemClickListener() {//监听哪一个被点击，并将点击的条目变灰色@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {position=position-lv_tablist.getHeaderViewsCount();System.out.println(position+"  : "+view);//changeReadState(view);//直接调用的弊端，由于是优化过的ListView 因此不是重复绘制ListView,一个被标记时会出现多个ListView变灰色的情况/* * 可使用sharePreference来记录被点击的ID */String ids = PreferenceUtils.getString(mActivity, "read_ids", "");if(!ids.contains(mNewsList.get(position).id)){ids=ids+mNewsList.get(position).id+" ,";PreferenceUtils.SetString(mActivity, "read_ids", ids);}mNewsdapger.notifyDataSetChanged();}});

3 刷新ListVIew:

使用notifyDataSetChanged之后，在适配器getView中添加：

/* * 获取被点击ListView 的ID,并变换Title的颜色 */String ids=PreferenceUtils.getString(mActivity, "read_ids", "");if(ids.contains(getItem(position).id)){holder.ViewHolder_tvTitle.setTextColor(Color.GRAY);}else{holder.ViewHolder_tvTitle.setTextColor(Color.BLACK);}

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