SharedPreferences Helper Class

Share.kt

class Share private constructor() {
    private var context: Context? = null
    private var preferences: SharedPreferences? = null

    companion object {

        private val PREF_NAME = "_Share"
        private val ourInstance: Share by lazy { setInstance() }

        private fun setInstance(): Share {
            val share = Share()
            share.context = MyApplication.context
            share.preferences = share.context!!.getSharedPreferences(PREF_NAME,
                    Activity.MODE_PRIVATE)
            return share
        }

        fun put(key: String, `val`: String) {
            val prefEdit = ourInstance.preferences!!.edit()
            prefEdit.putString(key, `val`)
            prefEdit.apply()
        }

        fun put(key: String, `val`: Boolean?) {
            val prefEdit = ourInstance.preferences!!.edit()
            prefEdit.putBoolean(key, `val`!!)
            prefEdit.apply()
        }

        fun put(key: String, `val`: Int) {
            val prefEdit = ourInstance.preferences!!.edit()
            prefEdit.putInt(key, `val`)
            prefEdit.apply()
        }

        fun put(key: String, `val`: Float?) {
            val prefEdit = ourInstance.preferences!!.edit()
            prefEdit.putFloat(key, `val`!!)
            prefEdit.apply()
        }

        fun put(key: String, `val`: Long?) {
            val prefEdit = ourInstance.preferences!!.edit()
            prefEdit.putLong(key, `val`!!)
            prefEdit.apply()
        }

        fun put(key: String, list: List<String>) {
            val prefEdit = ourInstance.preferences!!.edit()
            val gson = Gson()
            val json = gson.toJson(list)
            prefEdit.putString(key, json)
            prefEdit.apply()
        }

        fun getStringList(key: String, defaultValue: String): List<String> {
            val gson = Gson()
            val json = ourInstance.preferences!!.getString(key, defaultValue)
            val type = object : TypeToken<List<String>>() {

            }.type
            val list = gson.fromJson<List<String>>(json, type)
            return list
        }

        fun getString(key: String, defaultValue: String): String {
            return ourInstance.preferences!!.getString(key, defaultValue)
        }

        fun getBoolean(key: String, defaultValue: Boolean): Boolean {
            return ourInstance.preferences!!.getBoolean(key, defaultValue)
        }

        fun getFloat(key: String, defaultValue: Float): Float {
            return ourInstance.preferences!!.getFloat(key, defaultValue)
        }

        fun getInt(key: String, defaultValue: Int): Int {
            return ourInstance.preferences!!.getInt(key, defaultValue)
        }

        fun getLong(key: String, defaultValue: Long): Long {
            return ourInstance.preferences!!.getLong(key, defaultValue)
        }
    }
}