lateinit property has not been initialized I can not find a way to Initialize it
I have lateinit property in my Kotlin activity, this is simplified version of that:
class CreateNewListOfQuestions : AppCompatActivity() {
lateinit var questionAnswerListOfObjects: ArrayList<QuestionAnswerObject>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_create_new_list_of_questions)
save.setOnClickListener {
questionAnswerListOfObjects.add(0, QuestionAnswerObject("question", "answer", 1))
}
}
}
The main problem is that when I generate mobile app and press “Save” button app stops working.
Logcat shows this error: “lateinit property questionAnswerListOfObjects has not been initialized”
I was trying many ways to initialize it but these ways did not help to me. How should I properly initialize it?
I am plining to add to ArrayList many objects of this class:
class QuestionAnswerObject(var question: String, var answer: String, var probability: Int=100) {}
android kotlin edited Nov 25 '18 at 14:16
Jayson Minard
40.2k17112173
asked Nov 24 '18 at 21:40
Павел МалиновскийПавел Малиновский
913
add a comment |
I have lateinit property in my Kotlin activity, this is simplified version of that:
class CreateNewListOfQuestions : AppCompatActivity() {
lateinit var questionAnswerListOfObjects: ArrayList<QuestionAnswerObject>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_create_new_list_of_questions)
save.setOnClickListener {
questionAnswerListOfObjects.add(0, QuestionAnswerObject("question", "answer", 1))
}
}
}
The main problem is that when I generate mobile app and press “Save” button app stops working.
Logcat shows this error: “lateinit property questionAnswerListOfObjects has not been initialized”
I was trying many ways to initialize it but these ways did not help to me. How should I properly initialize it?
I am plining to add to ArrayList many objects of this class:
class QuestionAnswerObject(var question: String, var answer: String, var probability: Int=100) {}
edited Nov 25 '18 at 14:16
Jayson Minard
40.2k17112173
asked Nov 24 '18 at 21:40
Павел МалиновскийПавел Малиновский
913
Assign an object to it before the click listener is called the first time.
– Michael Butscher
Nov 24 '18 at 21:46
add a comment |
I have lateinit property in my Kotlin activity, this is simplified version of that:
class CreateNewListOfQuestions : AppCompatActivity() {
lateinit var questionAnswerListOfObjects: ArrayList<QuestionAnswerObject>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_create_new_list_of_questions)
save.setOnClickListener {
questionAnswerListOfObjects.add(0, QuestionAnswerObject("question", "answer", 1))
}
}
}
The main problem is that when I generate mobile app and press “Save” button app stops working.
Logcat shows this error: “lateinit property questionAnswerListOfObjects has not been initialized”
I was trying many ways to initialize it but these ways did not help to me. How should I properly initialize it?
I am plining to add to ArrayList many objects of this class:
class QuestionAnswerObject(var question: String, var answer: String, var probability: Int=100) {}
edited Nov 25 '18 at 14:16
Jayson Minard
40.2k17112173
asked Nov 24 '18 at 21:40
Павел МалиновскийПавел Малиновский
913
I have lateinit property in my Kotlin activity, this is simplified version of that:
class CreateNewListOfQuestions : AppCompatActivity() {
lateinit var questionAnswerListOfObjects: ArrayList<QuestionAnswerObject>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_create_new_list_of_questions)
save.setOnClickListener {
questionAnswerListOfObjects.add(0, QuestionAnswerObject("question", "answer", 1))
}
}
}
The main problem is that when I generate mobile app and press “Save” button app stops working.
Logcat shows this error: “lateinit property questionAnswerListOfObjects has not been initialized”
I was trying many ways to initialize it but these ways did not help to me. How should I properly initialize it?
I am plining to add to ArrayList many objects of this class:
class QuestionAnswerObject(var question: String, var answer: String, var probability: Int=100) {}
edited Nov 25 '18 at 14:16
Jayson Minard
40.2k17112173
asked Nov 24 '18 at 21:40
Павел МалиновскийПавел Малиновский
913
edited Nov 25 '18 at 14:16
Jayson Minard
40.2k17112173
asked Nov 24 '18 at 21:40
Павел МалиновскийПавел Малиновский
913
edited Nov 25 '18 at 14:16
Jayson Minard
40.2k17112173
edited Nov 25 '18 at 14:16
Jayson Minard
40.2k17112173
edited Nov 25 '18 at 14:16
Jayson Minard
40.2k17112173
40.2k17112173
asked Nov 24 '18 at 21:40
Павел МалиновскийПавел Малиновский
913
asked Nov 24 '18 at 21:40
Павел МалиновскийПавел Малиновский
913
asked Nov 24 '18 at 21:40
Павел МалиновскийПавел Малиновский
913
913
Assign an object to it before the click listener is called the first time.
– Michael Butscher
Nov 24 '18 at 21:46
add a comment |
Assign an object to it before the click listener is called the first time.
– Michael Butscher
Nov 24 '18 at 21:46
Assign an object to it before the click listener is called the first time.
– Michael Butscher
Nov 24 '18 at 21:46
Assign an object to it before the click listener is called the first time.
– Michael Butscher
Nov 24 '18 at 21:46
add a comment |
1 Answer
1
active
oldest
votes
It depends what you want.
For example if everything you need is using ArrayList<QuestionAnswerObject> you dont need lateinit at all:
var questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
would be enough
If you want to get from Bundle or from something else - you must initialize it before using.
Basically lateinit keyword is used only to say "hey, compiler, I have a variable, it is not initialized yet, but I promise it will be initialized before I use it, so please mark it as not nullable field".
So if you really want to use lateinit, just init that property earlier, for example add after setContentView
questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
answered Nov 24 '18 at 21:48
DEADMCDEADMC
2,84111325
Thank you! It was perfect solution! :)
– Павел Малиновский
Nov 24 '18 at 21:56
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
It depends what you want.
For example if everything you need is using ArrayList<QuestionAnswerObject> you dont need lateinit at all:
var questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
would be enough
If you want to get from Bundle or from something else - you must initialize it before using.
Basically lateinit keyword is used only to say "hey, compiler, I have a variable, it is not initialized yet, but I promise it will be initialized before I use it, so please mark it as not nullable field".
So if you really want to use lateinit, just init that property earlier, for example add after setContentView
questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
answered Nov 24 '18 at 21:48
DEADMCDEADMC
2,84111325
Thank you! It was perfect solution! :)
– Павел Малиновский
Nov 24 '18 at 21:56
add a comment |
It depends what you want.
For example if everything you need is using ArrayList<QuestionAnswerObject> you dont need lateinit at all:
var questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
would be enough
If you want to get from Bundle or from something else - you must initialize it before using.
Basically lateinit keyword is used only to say "hey, compiler, I have a variable, it is not initialized yet, but I promise it will be initialized before I use it, so please mark it as not nullable field".
So if you really want to use lateinit, just init that property earlier, for example add after setContentView
questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
answered Nov 24 '18 at 21:48
DEADMCDEADMC
2,84111325
Thank you! It was perfect solution! :)
– Павел Малиновский
Nov 24 '18 at 21:56
add a comment |
It depends what you want.
For example if everything you need is using ArrayList<QuestionAnswerObject> you dont need lateinit at all:
var questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
would be enough
If you want to get from Bundle or from something else - you must initialize it before using.
Basically lateinit keyword is used only to say "hey, compiler, I have a variable, it is not initialized yet, but I promise it will be initialized before I use it, so please mark it as not nullable field".
So if you really want to use lateinit, just init that property earlier, for example add after setContentView
questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
answered Nov 24 '18 at 21:48
DEADMCDEADMC
2,84111325
It depends what you want.
For example if everything you need is using ArrayList<QuestionAnswerObject> you dont need lateinit at all:
var questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
would be enough
If you want to get from Bundle or from something else - you must initialize it before using.
Basically lateinit keyword is used only to say "hey, compiler, I have a variable, it is not initialized yet, but I promise it will be initialized before I use it, so please mark it as not nullable field".
So if you really want to use lateinit, just init that property earlier, for example add after setContentView
questionAnswerListOfObjects = ArrayList<QuestionAnswerObject>()
answered Nov 24 '18 at 21:48
DEADMCDEADMC
2,84111325
edited Nov 24 '18 at 21:55
answered Nov 24 '18 at 21:48
DEADMCDEADMC
2,84111325
answered Nov 24 '18 at 21:48
DEADMCDEADMC
2,84111325
answered Nov 24 '18 at 21:48
DEADMCDEADMC
2,84111325
2,84111325
Thank you! It was perfect solution! :)
– Павел Малиновский
Nov 24 '18 at 21:56
add a comment |
Thank you! It was perfect solution! :)
– Павел Малиновский
Nov 24 '18 at 21:56
Thank you! It was perfect solution! :)
– Павел Малиновский
Nov 24 '18 at 21:56
Thank you! It was perfect solution! :)
– Павел Малиновский
Nov 24 '18 at 21:56
add a comment |
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Assign an object to it before the click listener is called the first time.
– Michael Butscher
Nov 24 '18 at 21:46