How can I initialize in onResponse function? (Android Kotlin)-CodePudding

I thought when response.body()?.let {} run, enrollBookAdapter (or booklist = it.books as mutableList<book>) would be initialized but, it did not... What am I doing wrong? How can I initailize bookList with Books...

class EnrollBookActivity : AppCompatActivity() {

    private lateinit var binding: ActivityEnrollBookBinding
    private lateinit var bookService: BookService
    private lateinit var bookList:MutableList<Book>
    private lateinit var enrollBookAdapter: EnrollBookAdapter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityEnrollBookBinding.inflate(layoutInflater)

        setContentView(binding.root)


        initBookService()
        bookServiceLoadBestSellers()


        binding.selfBtn.setOnClickListener{
            startActivity(Intent(this,SelfWriteActivity::class.java))
        }
        enrollBookAdapter.setOnBookClickListener(object:EnrollBookAdapter.OnBookClickListener{
            override fun onBookClick(position: Int, book: Book) {
                val intent = Intent(this@EnrollBookActivity,TalerMain::class.java)
                intent.putExtra("title",enrollBookAdapter.bookList[position].title)
                intent.putExtra("url",enrollBookAdapter.bookList[position].title)
                
                startActivity(intent)
            }

        })
    }
    private fun initBookRecyclerView(bookList: MutableList<Book>) {
        enrollBookAdapter = EnrollBookAdapter(bookList)
        enrollBookAdapter.setOnBookClickListener(object:EnrollBookAdapter.OnBookClickListener{
            override fun onBookClick(position: Int, book: Book) {
                val intent = Intent(this@EnrollBookActivity,TalerMain::class.java)
                intent.putExtra("title",enrollBookAdapter.bookList[position].title)
                intent.putExtra("url",enrollBookAdapter.bookList[position].title)
                startActivity(intent)
            }

        })
        binding.bookRv.layoutManager = GridLayoutManager(this,2)
        binding.bookRv.adapter = EnrollBookAdapter(bookList)
        binding.bookRv.addItemDecoration(DividerItemDecoration(this, LinearLayoutManager.VERTICAL))
    }
    private fun bookServiceLoadBestSellers() {
        bookService.getBestSellerBooks(getString(R.string.interparkAPIKey))
            .enqueue(object : Callback<BestSellerDto> {
                
                override fun onResponse(
                    call: Call<BestSellerDto>,
                    response: Response<BestSellerDto>
                ) {
                    
                    if (response.isSuccessful.not()) {
                        Log.e(M_TAG, "NOT!! SUCCESS")
                        return
                    }

                    
                    response.body()?.let {
                        Log.d(M_TAG, it.toString())

                        it.books.forEach { book ->
                            Log.d(M_TAG, book.toString())
                        }
                        
                        //enrollBookAdapter = EnrollBookAdapter(it.books as MutableList<Book>)
                        initBookRecyclerView(it.books as MutableList<Book>)
                        //setRecyclerView(it.books)
                    }
                }

                override fun onFailure(call: Call<BestSellerDto>, t: Throwable) {
                    Log.e(M_TAG, t.toString())
                }
            })
    }
}

Error

"java.lang.RuntimeException: Unable to start activity ComponentInfo{com.clone.practice/com.clone.practice.EnrollBookActivity}: kotlin.UninitializedPropertyAccessException: lateinit property enrollBookAdapter has not been initialized"

CodePudding user response：

Try to add initBookRecyclerView before enrollBookAdapter.setOnBookClickListener(object:EnrollBookAdapter.OnBookClickListener line in onCreate.

After that uncomment enrollBookAdapter = EnrollBookAdapter(it.books as MutableList<Book>) and comment the next line.

CodePudding user response：

just remove this code from your onCreate method only as you are trying to use enrollBookAdapter variable before initialisation which is causing crash . And you have already set this method in initBookRecyclerView method so no need in onCreate method

enrollBookAdapter.setOnBookClickListener(object:EnrollBookAdapter.OnBookClickListener{
            override fun onBookClick(position: Int, book: Book) {
                val intent = Intent(this@EnrollBookActivity,TalerMain::class.java)
                intent.putExtra("title",enrollBookAdapter.bookList[position].title)
                intent.putExtra("url",enrollBookAdapter.bookList[position].title)
                
                startActivity(intent)
            }

        })