Android搜索历史本地保存

最新推荐文章于 2024-04-01 12:04:55 发布

原创最新推荐文章于 2024-04-01 12:04:55 发布 · 485 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#android

本文介绍了一种在Android应用中使用SharedPreferences保存和读取搜索历史记录的方法。通过将历史记录字符串化并用逗号分隔，可以有效地存储多个城市搜索记录，并在需要时检索出来。此外，还提供了一个检查和清理历史记录的机制，确保记录数量不超过设定上限。

//保存搜索历史，保存到SharedPreferences
const val PREFERENCE_NAME = "save_city_search_history"
const val SEARCH_HISTORY = "search_city_search_history"
@Suppress("NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS")
fun saveSearchHistory(mContext: Context, saveString: String) {
    val sp: SharedPreferences = mContext.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
    if (saveString == "") {
        return
    } else {
        val history: String = sp.getString(SEARCH_HISTORY, "")
        val historyList: ArrayList<String> = arrayListOf()
        val historyListSpit = history.split(",")
        for (index in historyListSpit) {
            historyList.add(index)
            historyList.remove("")
        }
        if (historyList.size == 1 && historyList[0] == "") {
            historyList.clear()
        }
        val edit = sp.edit()
        if (historyList.isNotEmpty()) {
            for (index in historyList) {
                if (saveString == index) {
                    historyList.remove(index)
                    break
                }
            }
            historyList.add(0, saveString)
            //如果超过6，删除最后一个
            if (historyList.size > 6)
                historyList.removeAt(historyList.size - 1)
            val sb: StringBuilder = StringBuilder()
            for (index in historyList) {
                sb.append("${index},")
            }
            edit.putString(SEARCH_HISTORY, sb.toString())
            edit.commit()
        } else {
            edit.putString(SEARCH_HISTORY, "${saveString},")
            edit.commit()
        }
    }
}
//获取搜索历史
@Suppress("NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS")
fun getSearchHistory(mContext: Context): ArrayList<String> {
    val sp: SharedPreferences = mContext.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
    val history: String = sp.getString(SEARCH_HISTORY, "")
    var historyList: ArrayList<String> = arrayListOf()
    val historyListSpit = history.split(",")
    for (index in historyListSpit) {
        historyList.add(index)
        historyList.remove("")
    }
    if (historyList.size == 1 && historyList[0] == "") {
        historyList.clear()
    }
    return historyList
}