Singletone class of SharedPreferences

PreferenceManager.kt

import android.annotation.SuppressLint
import android.app.Activity
import android.content.Context
import android.content.SharedPreferences


@Suppress("NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS")
@SuppressLint("CommitPrefEdits")
class PreferenceManager() {

    companion object {
        private val sharePref = PreferenceManager()
        private var mSharedPreferences: SharedPreferences? = null
        private var editor: SharedPreferences.Editor? = null

        //The context passed into the getInstance should be application level context.
        fun getInstance(context: Context): PreferenceManager {
            if (mSharedPreferences == null) {
                mSharedPreferences = context.getSharedPreferences(context.packageName, Activity.MODE_PRIVATE)
            }
            return sharePref
        }
    }

    fun setStringValue(key: String, value: String) {
        editor = mSharedPreferences!!.edit()
        editor!!.putString(key, value)
        editor!!.apply()
    }

    fun getStringValue(key: String): String {
        return mSharedPreferences!!.getString(key, "")
    }


    fun setIntValue(key: String, value: Int) {
        editor = mSharedPreferences!!.edit()
        editor!!.putInt(key, value)
        editor!!.apply()
    }

    fun getIntValue(key: String): Int {
        return mSharedPreferences!!.getInt(key, 0)
    }

    fun setBooleanValue(key: String, value: Boolean) {
        editor = mSharedPreferences!!.edit()
        editor!!.putBoolean(key, value)
        editor!!.apply()
    }

    fun getBooleanValue(key: String): Boolean {
        return (mSharedPreferences as SharedPreferences).getBoolean(key, false)
    }

    fun saveMultipleData(stringHashMap: HashMap<String, String>) {
        editor = mSharedPreferences!!.edit()
        for (key in stringHashMap.keys) {
            editor!!.putString(key, stringHashMap[key])
        }
        editor!!.apply()
    }

    fun clearSharedPreferences() {
        editor = mSharedPreferences!!.edit()
        editor!!.clear()
        editor!!.apply()
    }
}