Android实现搜索历史记录的本地存储。

主要通过SharedPreferences进行存储，难点主要是1.倒序显示 2.去重 3.最多显示n条。话不多说看代码

private final static String PREFERENCE_NAME = "superservice_ly";
private final static String SEARCH_HISTORY="linya_history";
// 保存搜索记录
    public static void saveSearchHistory(String inputText) {
        SharedPreferences sp = App.context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
        if (TextUtils.isEmpty(inputText)) {
            return;
        }
        String longHistory = sp.getString(SEARCH_HISTORY, "");  //获取之前保存的历史记录
        String[] tmpHistory = longHistory.split(","); //逗号截取 保存在数组中
        List historyList = new ArrayList(Arrays.asList(tmpHistory)); //将改数组转换成ArrayList
        SharedPreferences.Editor editor = sp.edit();
        if (historyList.size() > 0) {
            //1.移除之前重复添加的元素
            for (int i = 0; i < historyList.size(); i++) {
                if (inputText.equals(historyList.get(i))) {
                    historyList.remove(i);
                    break;
                }
            }
            historyList.add(0, inputText); //将新输入的文字添加集合的第0位也就是最前面(2.倒序)
            if (historyList.size() > 8) {
                historyList.remove(historyList.size() - 1); //3.最多保存8条搜索记录 删除最早搜索的那一项
            }
            //逗号拼接
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < historyList.size(); i++) {
                sb.append(historyList.get(i) + ",");
            }
            //保存到sp
            editor.putString(SEARCH_HISTORY, sb.toString());
            editor.commit();
        } else {
            //之前未添加过
            editor.putString(SEARCH_HISTORY, inputText + ",");
            editor.commit();
        }
    }
//获取搜索记录
    public static List getSearchHistory(){
        SharedPreferences sp = App.context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
        String longHistory =sp.getString(SEARCH_HISTORY, "");
        String[] tmpHistory = longHistory.split(","); //split后长度为1有一个空串对象
        List historyList = new ArrayList(Arrays.asList(tmpHistory));
        if (historyList.size() == 1 && historyList.get(0).equals("")) { //如果没有搜索记录，split之后第0位是个空串的情况下
            historyList.clear();  //清空集合，这个很关键
        }
        return historyList;
    }

代码就这些，放到你的工具类里面，在你需要的地方调用就好了。