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

Question

我使用 Kotlin 语言在 Android Studio 中制作了这个应用程序。 当我创建应用程序时发生错误。

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()}")
            }
        })
    }
}

这是错误截图：

Answer 1

当您尝试在两种不同的变量类型之间分配值时，会发生类型不匹配错误。

 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

您的HomeAdapter将是

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

供参考

• 我假设results?: emptyList()持有ArrayList<String> 。
• 设置正确的名称。 RecyclerView 的Object 名称itemAdapter是不可接受的。