Question

我正在使用Retrofit2和Kotlin Coroutines从api中获取数据以显示在RecycerView中。我刚刚开始学习Retrofit和Coroutines，目前数据还没有显示，我不确定如何解决！我认为问题可能出在协程代码上。有人可以帮我吗？

class MainActivity : AppCompatActivity() {

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

        var recyclerView: RecyclerView = findViewById(R.id.rockets_list)
        recyclerView.layoutManager = LinearLayoutManager(this)
        recyclerView.adapter = RecyclerAdapter(List<RocketData>())


        CoroutineScope(IO).launch {
            val response = ApiInterface.getApi().getRockets()
            Log.i("code",response.toString())
            withContext(Dispatchers.Main) {
                try {
                    if (response.isSuccessful) {
                        recyclerView.adapter
                    } else {
                        Toast.makeText(this@MainActivity, "Error ${response.code()}", Toast.LENGTH_SHORT).show()

                    }
                } catch (e: HttpException) {
                    Toast.makeText(this@MainActivity, "Exception ${e.message}", Toast.LENGTH_SHORT).show()

                }
            }

        }
    }
}

interface ApiInterface {
    @GET("rockets")
    suspend fun getRockets(): Response<List<RocketData>>

    companion object {

        fun getApi(): ApiInterface = Retrofit.Builder()
            .baseUrl("https://api.spacexdata.com/v3/")
            .addConverterFactory(GsonConverterFactory.create())
            .build()
            .create(ApiInterface::class.java)
    }
}

Answer 1

response.isSuccessful检查后您在做什么？

尝试在适配器中设置响应，然后notifyDataSetChanged

recyclerView.adapter.items = response
recyclerView.adapter.notifyDataSetChanged()

Answer 2

您的改造和协程实施效果很好，成功检查响应后，您只是没有更新适配器列表

if (response.isSuccessful) {
    recyclerView.adapter.list = response.body
    recyclerView.adapter.notifyDataSetChanged()
}

您也无法在协同程序中显示Toast，而是将其包装在runOnUiThread{}

中

如何在Retrofit2中使用协程？

2 个答案: