How can I access to data class object from activity?-CodePudding

I am trying to access to data class (Content)and I would like to use object(val isSelected: Boolean?)from PictureActivity. However, it causes UninitializedPropertyAccessException: lateinit property content has not been initialized. Do you know how to solve this situation? I used lateinit but I don't even know if using lateinit is the best way to access to data class(Content). If you know other way to access to it, please let me know.

The code is down below.

Content.kt

data class Content(
    val id: Int,
    val text: String,
    val isSelected: Boolean?,
    val url: String?
)

PictureActivity.kt

class PictureActivity : BaseActivity() {

    private lateinit var binding: PictureActivityBinding

    private lateinit var content: Content

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = PictureActivityBinding.inflate(layoutInflater)
        setContentView(binding.root)
     
        if(content.isSelected!!){
           binding.button1.setOnClickListner{
           startContentDownload(content.url!!)
             return@setOnClickListener
        }
     }
     private fun startContentDownload(url: String) {
        //download image
    }
  }
}

CodePudding user response：

lateinit keyword in Kotlin gives you an option to initialize it later but make sure you do it before you use.

To check if that variable is initialized or not, you can use below:

if(::content.isInitialized) {
    // put your code here
}

In your case you have get data from somewhere(network call maybe) to fill in content data class, and then you will be able to use it.

CodePudding user response：

You need to initialize the content variable first then only you can use it

content = Content(...)