如何初始化onResponse函数?(安卓芬兰湾的科特林)

Question

我认为当response.body()?.let {}运行时，enrollBookAdapter(或booklist = it.books as mutableList<book>)将被初始化，但是，它没有…我做错了什么?

如何用Books…初始化bookList

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())
}
})
}
}

误差

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

我认为当response.body()?.let {}运行时，enrollBookAdapter(或booklist = it.books as mutableList<book>)将被初始化，但是，它没有…我做错了什么?

如何用Books…初始化bookList

Answer 1

尝试在onCreate的enrollBookAdapter.setOnBookClickListener(object:EnrollBookAdapter.OnBookClickListener行之前添加initBookRecyclerView。

之后取消注释enrollBookAdapter = EnrollBookAdapter(it.books as MutableList<Book>)并注释下一行。

Answer 2

仅当您试图在初始化之前使用导致崩溃的enrollBookAdapter变量时，从onCreate方法中删除此代码。而且你已经在initBookRecyclerView方法中设置了这个方法所以不需要在onCreate方法中设置

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)
}
})