MMKV替代sp，封装的工具类(kotlin)

使用MMKV替代SharedPreferences，

• 好处：MMKV是微信应用程序中使用的一种高效、小巧、易用的移动键值存储框架。目前在iOS、macOS、Android和Windows上都可以使用。

一、在app的build.gradle中引入

    implementation 'com.tencent:mmkv:1.0.19'

二、在application里初始化

        MMKV.initialize(getApplication());

三、使用SpUtil如下：

        SpUtil.INSTANCE.encode()
        SpUtil.INSTANCE.decodeStringSet()

mmkv官方说明:
https://github.com/Tencent/MMKV/wiki/android_tutorial

封装见完整代码如下：

object SpUtil {
    var mmkv: MMKV? = null

    init {
        mmkv = MMKV.defaultMMKV()
    }

    fun encode(key: String, value: Any?) {
        when (value) {
            is String -> mmkv?.encode(key, value)
            is Float -> mmkv?.encode(key, value)
            is Boolean -> mmkv?.encode(key, value)
            is Int -> mmkv?.encode(key, value)
            is Long -> mmkv?.encode(key, value)
            is Double -> mmkv?.encode(key, value)
            is ByteArray -> mmkv?.encode(key, value)
            is Nothing -> return
        }
    }

    fun <T : Parcelable> encode(key: String, t: T?) {
        if(t ==null){
            return
        }
            mmkv?.encode(key, t)
    }

    fun encode(key: String, sets: Set<String>?) {
        if(sets ==null){
            return
        }
        mmkv?.encode(key, sets)
    }

    fun decodeInt(key: String): Int? {
        return mmkv?.decodeInt(key, 0)
    }

    fun decodeDouble(key: String): Double? {
        return mmkv?.decodeDouble(key, 0.00)
    }

    fun decodeLong(key: String): Long? {
        return mmkv?.decodeLong(key, 0L)
    }

    fun decodeBoolean(key: String): Boolean? {
        return mmkv?.decodeBool(key, false)
    }

    fun decodeFloat(key: String): Float? {
        return mmkv?.decodeFloat(key, 0F)
    }

    fun decodeByteArray(key: String): ByteArray? {
        return mmkv?.decodeBytes(key)
    }

    fun decodeString(key: String): String? {
        return mmkv?.decodeString(key, "")
    }

    fun <T : Parcelable> decodeParcelable(key: String, tClass: Class<T>): T? {
        return mmkv?.decodeParcelable(key, tClass)
    }

    fun decodeStringSet(key: String): Set<String>? {
        return mmkv?.decodeStringSet(key, Collections.emptySet())
    }

    fun removeKey(key: String) {
        mmkv?.removeValueForKey(key)
    }

    fun clearAll() {
        mmkv?.clearAll()
    }
}