我试图从此api中获取一些json：https://api.cointelegraph.com/api/v1/mobile/feed 我想获得每个新闻的“标题”字段。我创建了一个应该获取该字段和该类包装器的类，但是我得到的是一个空列表，而不是空列表，我想这是因为我必须获取一个字段，该字段首先称为“数据”，然后对其进行解析。因此，我将获取“标题”字段的班级更改为获取“数据”字段的班级，但是我仍然得到空列表。我猜这是一个愚蠢的错误，因为它可以与github api一起使用。我将在下面和我的代码中添加某种响应。感谢您的帮助。
Json回复：
{"data":{"news":[{"type":"header","data":{"id":22358,"title":"MIT, Stanford Researchers to Fund New \u2018Globally Scalable\u2019 Cryptocurrency, \u2018Unit-e\u2019","lead":"Major U.S. universities including MIT, Stanford and UC Berkeley have teamed up to fund a new digital currency.","thumb":"https:\/\/s3.cointelegraph.com\/storage\/uploads\/view\/f7a7d42a1cba645f861ba810d2524f77.jpg","published_at":{"date":"2019-01-17 18:52:00.000000","timezone_type":3,"timezone":"Europe\/London"},"share_url":"https:\/\/cointelegraph.com\/news\/mit-stanford-researchers-to-fund-new-globally-scalable-cryptocurrency-unit-e","views":2375,"type":"news","author":"Helen Partz","author_id":545,"tag":"Blockchain","badge":{"title":"News","label":"default"},"isSponsored":false,"audio":"https:\/\/s3.cointelegraph.com\/audio\/22358.71732d08-dc28-4787-98b1-46c4e0317916.mp3"}},{"type":"currencies","data":[{"price":3677.37,"name":"BTC","currency":"USD","isIncreased":1,"difference":"0.89"},{"price":123.57,"name":"ETH","currency":"USD","isIncreased":1,"difference":"0.17"},{"price":31.56,"name":"LTC","currency":"USD","isIncreased":1,"difference":"0.19"},{"price":0.33,"name":"XRP","currency":"USD","isIncreased":1,"difference":"1.22"}]},
接口：
package com.hfad.cointask.service
import com.hfad.cointask.model.DataLIst
import com.hfad.cointask.model.NewsList
import retrofit2.Call
import retrofit2.http.*
interface CoinClient {
@GET("api/v1/mobile/feed")
fun getFeed(): Call
}
<b>News class:</b>
<pre>
package com.hfad.cointask.model
class News (private var data: String) {
fun getData():String{
return data
}
}
我已经尝试过这样第一次获得冠军
package com.hfad.cointask.model
class News (private var title: String) {
fun getTitle():String{
return title
}
}
我的新闻类包装：
package com.hfad.cointask.model
class NewsList {
var list = mutableListOf()
}
我的适配器：
package com.hfad.cointask.adapter
import android.support.v7.view.menu.MenuView
import android.support.v7.view.menu.MenuView.ItemView
import android.support.v7.widget.RecyclerView
import android.support.v7.widget.RecyclerView.ViewHolder
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import com.hfad.cointask.R
import com.hfad.cointask.model.News
class CoinAdapter(var values: List): RecyclerView.Adapter() {
override fun onBindViewHolder(p0: CoinViewHolder, p1: Int) {
val itemTitle: News = values[p1]
p0.newsTitle.text = itemTitle.getData()
}
override fun getItemCount(): Int {
return values.size
}
override fun onCreateViewHolder(p0: ViewGroup, p1: Int): CoinViewHolder {
val view: View = LayoutInflater.from(p0.context).inflate(R.layout.news_item_view, p0, false)
return CoinViewHolder(view)
}
class CoinViewHolder(itemView: View): ViewHolder(itemView) {
var newsTitle: TextView = itemView.findViewById(R.id.item_title)
}
}
我的主要活动：
package com.hfad.cointask
import android.os.Bundle
import android.support.design.widget.BottomNavigationView
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.LinearLayoutManager
import android.support.v7.widget.RecyclerView
import android.widget.Toast
import com.hfad.cointask.adapter.CoinAdapter
import com.hfad.cointask.model.DataLIst
import com.hfad.cointask.model.News
import com.hfad.cointask.model.NewsList
import com.hfad.cointask.service.CoinClient
import kotlinx.android.synthetic.main.activity_feed.*
import retrofit2.Call
import retrofit2.Callback
import retrofit2.Response
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory
class FeedActivity : AppCompatActivity() {
var news = mutableListOf()
private lateinit var newsRecyclerView: RecyclerView
private lateinit var newsAdapter: CoinAdapter
private lateinit var layoutManager: LinearLayoutManager
private val client = mCoinClient().build()
private val mOnNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
when (item.itemId) {
R.id.navigation_home -> {
message.setText(R.string.title_home)
return@OnNavigationItemSelectedListener true
}
R.id.navigation_dashboard -> {
message.setText(R.string.title_dashboard)
return@OnNavigationItemSelectedListener true
}
R.id.navigation_notifications -> {
message.setText(R.string.title_notifications)
return@OnNavigationItemSelectedListener true
}
}
false
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_feed)
newsRecyclerView = findViewById(R.id.news_recycler_view)
layoutManager = LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)
newsRecyclerView.layoutManager = layoutManager
newsAdapter = CoinAdapter(news)
newsRecyclerView.adapter = newsAdapter
getNews().enqueue(object: Callback{
override fun onResponse(call: Call, response: Response) {
var jsonNews = response.body().list
news.clear()
news.addAll(response.body().list)
newsAdapter.notifyDataSetChanged()
}
override fun onFailure(call: Call?, t: Throwable?) {
val toast = Toast.makeText(this@FeedActivity, t.toString(), Toast.LENGTH_SHORT)
toast.show()
}
})
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)
}
private fun getNews() = client.getFeed()
class mCoinClient {
private val builder = Retrofit
.Builder()
.baseUrl("https://api.cointelegraph.com/")
.addConverterFactory(GsonConverterFactory.create())
private val retrofit: Retrofit by lazy {
builder.build()
}
private val client: CoinClient by lazy {
retrofit.create(CoinClient::class.java)
}
fun build() = client
}
}
感谢您的帮助
答案 0 :(得分：0)
我认为您应该将界面更改为
interface CoinClient {
@GET("api/v1/mobile/feed")
fun getFeed(): Call<Your Object that you want to receive it with>
}