类型不匹配，必需：（Recyclerview.Adapter<recyclerview.viewholder> ?..Recyclerview.Adapter&lt;*&gt;，找到：HomeAdapter</recyclerview.viewholder>

Question

I made this application in Android Studio using Kotlin language. When I made the application an error occurred.

class HomeActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_home)

        val progressBar = findViewById<ProgressBar>(R.id.pb_home)


        val dataSource = NetworkProvider.providesHttpAdapter().create(HomeDataSource::class.java)
        dataSource.discoverMovie().enqueue(object : Callback<HomeResponse> {
            override fun onResponse(
                call: Call<HomeResponse>, response:
                Response<HomeResponse>
            ) {
                progressBar.visibility = View.GONE

                val results = response.body()?.results
                val itemAdapter = findViewById<RecyclerView>(R.id.rv_home)
                itemAdapter.addItemDecoration(
                    DividerItemDecoration(this@HomeActivity,
                        DividerItemDecoration.VERTICAL))
               itemAdapter.adapter = HomeAdapter (results ?: emptyList())
            }

            override fun onFailure(call: Call<HomeResponse>, t: Throwable) {
                Log.e(HomeActivity::class.java.simpleName, "${t.printStackTrace()}")
            }
        })
    }
}

Here is the error screenshot:

Answer 1

Type Mismatch Error occurs when you try to assign a value between two different variable types.

 val recyclerView                = findViewById(R.id.rv_home) as RecyclerView?
 val adapterOBJ                  = HomeAdapter(results ?: emptyList())
 recyclerView?.layoutManager     = LinearLayoutManager(this@HomeActivity, RecyclerView.VERTICAL, false)
 recyclerView?.adapter           = adapterOBJ

Your HomeAdapter will be

class HomeAdapter (private val alList: ArrayList<String>) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {

FYI

• I assume results?: emptyList() holds ArrayList<String> .
• Set proper name. RecyclerView's Object name itemAdapter is not acceptable.