kotlin.UninitializedPropertyAccessException: lateinit property preferences has not been initialized

问题

I used the code of shared preference in my multiple project and it worked correctly but now when i apply the same code in another project it stopped working. following is error

kotlin.UninitializedPropertyAccessException: lateinit property preferences has not been initialized

Shared preferences code

object AppPrefrence {
    private const val NAME = "AComputerEngineer"
    private const val MODE = Context.MODE_PRIVATE
    private lateinit var preferences: SharedPreferences

    private val user_id = Pair("user_id","")
    private val ngo_id = Pair("ngo_id","")
    private val IS_LOGIN = Pair("is_login", false)
    private val catagoryName = Pair("Catagory", "")
    private val user_phone = Pair("user_phone", "")


    fun init(context: Context) {
        preferences = context.getSharedPreferences(NAME, MODE)
    }
    //an inline function to put variable and save it
    private inline fun SharedPreferences.edit(operation: (SharedPreferences.Editor) -> Unit) {
        val editor = edit()
        operation(editor)
        editor.apply()
    }
    var userId: String
        get() = preferences.getString(user_id.first, user_id.second) ?: ""
        set(value) = preferences.edit {
            it.putString(user_id.first, value)
        }

    var ngoId: String
        get() = preferences.getString(ngo_id.first, ngo_id.second) ?: ""
        set(value) = preferences.edit {
            it.putString(ngo_id.first, value)
        }
    //SharedPreferences variables getters/setters
    var isLogin: Boolean
        get() = preferences.getBoolean(IS_LOGIN.first, IS_LOGIN.second)
        set(value) = preferences.edit {
            it.putBoolean(IS_LOGIN.first, value)
        }

    var category: String
        get() = preferences.getString(catagoryName.first, catagoryName.second) ?: ""
        set(value) = preferences.edit {
            it.putString(catagoryName.first, value)
        }

    var userPhone:String
    get() = preferences.getString(user_phone.first, user_phone.second)?:""
    set(value) = preferences.edit{
        it.putString(user_phone.first,value)
    }
}

set value in variable

   imgBtn_food?.setOnClickListener(View.OnClickListener {
                var fd = "food"
                catagoryname = fd
                AppPrefrence.category = catagoryname.toString()
                startActivity(Intent(this, Food_Ngo_Activity::class.java))
            })

回答1:

Before accessing the lateinit variable you should be initialized it. The initialization can be achieved in your case by calling the method init().

So your code will look like below:

AppPrefrence.init(this) // pass your context here
imgBtn_food?.setOnClickListener(View.OnClickListener {
                var fd = "food"
                catagoryname = fd
                AppPrefrence.category = catagoryname.toString()
                startActivity(Intent(this, Food_Ngo_Activity::class.java))
            })

来源：https://stackoverflow.com/questions/62849053/kotlin-uninitializedpropertyaccessexception-lateinit-property-preferences-has-n

标签

android

kotlin

sharedpreferences