android kotlin对sp进行封装

最新推荐文章于 2024-05-10 18:00:30 发布

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最新推荐文章于 2024-05-10 18:00:30 发布

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分类专栏： android 文章标签： android

本文链接：https://blog.youkuaiyun.com/u010231404/article/details/105995195

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这篇博客介绍了如何在Android中使用Kotlin对SharedPreferences进行封装，提供getSpValue和putSpValue函数，支持不同类型的读写操作，并包含一个clearSpValue函数用于清除所有数据。示例代码来源于wanandroid项目。

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是wanandroid老哥项目上的
private const val SP_WANANDROID = "spwanandroid"

@JvmOverloads
fun <T> getSpValue(
    filename: String = SP_WANANDROID,
    context : Context,
    key : String,
    defaultVal : T) : T{
    val sp = context.getSharedPreferences(filename,Context.MODE_PRIVATE)
    return when (defaultVal) {
        is Boolean -> sp.getBoolean(key, defaultVal) as T
        is String -> sp.getString(key, defaultVal) as T
        is Int -> sp.getInt(key, defaultVal) as T
        is Long -> sp.getLong(key, defaultVal) as T
        is Float -> sp.getFloat(key, defaultVal) as T
        is Set<*> -> sp.getStringSet(key, defaultVal as Set<String>) as T
        else -> throw IllegalArgumentException("Unrecognized default value $defaultVal")
    }
}

@JvmOverloads
fun <T> putSpValue(
    filename: String = SP_WANANDROID,
    context: Context,
    key: String,
    value: T ){
    val editor = context.getSharedPreferences(filename,Context.MODE_PRIVATE).edit();
    when (value) {
        is Boolean -> editor.putBoolean(key, value)
        is String -> editor.putString(key, value)
        is Int -> editor.putInt(key, value)
        is Long -> editor.putLong(key, value)
        is Float -> editor.putFloat(key, value)
        is Set<*> -> editor.putStringSet(key, value as Set<String>)
        else -> throw UnsupportedOperationException("Unrecognized value $value")
    }
    editor.apply()
}

@JvmOverloads
fun clearSpValue(filename: String = SP_WANANDROID, context: Context) {
    context.getSharedPreferences(filename, Context.MODE_PRIVATE)
        .edit()
        .clear()
        .apply()
}