使用 Volley 进行任务时未从 JSON 文件中获取数据

编程问答 2022-06-01

问题描述

我正在使用 YouTube 数据 API 来获取 YouTube 视频的详细信息。 我正在使用这个 url = "https://www.googleapis.com/youtube/v3/videosid=JbhBdOfMEPs&key=API_KEY&part=snippet"

这是我从 API 请求的主要 kt 文件


import android.app.VoiceInteractor
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.LinearLayout
import android.widget.Toast
import androidx.annotation.NonNull
import androidx.recyclerview.widget.DefaultItemAnimator
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.android.volley.Request
import com.android.volley.RequestQueue
import com.android.volley.Response
import com.android.volley.toolbox.JsonObjectRequest
import com.android.volley.toolbox.Volley
import com.pierfrancescosoffritti.androidyoutubeplayer.core.player.YouTubePlayer
import com.pierfrancescosoffritti.androidyoutubeplayer.core.player.listeners.AbstractYouTubePlayerListener
import com.pierfrancescosoffritti.androidyoutubeplayer.core.player.options.IFramePlayerOptions.Companion.default
import com.pierfrancescosoffritti.androidyoutubeplayer.core.player.views.YouTubePlayerView
import org.json.JSONException
import org.json.JSONObject
import java.lang.Exception

class MathPlayer2 : AppCompatActivity() {

    lateinit var query : RequestQueue
    lateinit var details:ArrayList<data_math>
    lateinit var youtubeNewPlayer:YouTubePlayerView
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_math_player2)
        youtubeNewPlayer = findViewById(R.id.youtubeNewplayer)
        initializingPlayer(youtubeNewPlayer,"JbhBdOfMEPs")
        query = Volley.newRequestQueue(this)
        val uid_array = arrayOf("JbhBdOfMEPs","rV7WjNWHOsI","fr04p6Ar9ic","qyW2mWvvtZ8","AkWtUOwlUgs","jC4SWFag6Qw","n9fgcm0Pwgs","-Xt4UDk7Kzw","YFyOsvnr9ig")

        details = ArrayList<data_math>()
        for(x in uid_array) {
            gettingRequest(x)
        }
        if(details.isEmpty()){
            println("///////////////////////////////////////////////")
            println("EMPTY")
        }
        val recyclerView : RecyclerView = findViewById(R.id.mathRecyclerView)
        val itemAdapter = Math_Recycler_Adapter(details)
        val layoutManager = LinearLayoutManager(this,RecyclerView.VERTICAL,false)
        recyclerView.layoutManager = layoutManager
        recyclerView.itemAnimator = DefaultItemAnimator()
        recyclerView.adapter = itemAdapter

    }

//Herer I AM REQUESTING


    private fun gettingRequest(x:String)
    {
        val url :String = "https://www.googleapis.com/youtube/v3/videos?id=" + x+
                "&key=API_KEY&part=snippet"

        val jsonObject = JsonObjectRequest(Request.Method.GET,url,null,Response.Listener<JSONObject> {
            val success = it.getBoolean("success")
            if(success)
            try{

                val items = it.getJSONArray("items")
                val item = items.getJSONObject(0)

                val uid = item.getString("id")
                val snippet = item.getJSONObject("snippet")
                val title_video = snippet.getString("title")
                val description = snippet.getString("description")
                val thumbnails = snippet.getJSONObject("thumbnails")
                val maxres = thumbnails.getJSONObject("maxres")
                val url = maxres.getString("url")
                val width = maxres.getInt("width")
                val height = maxres.getInt("height")
                details.add(data_math(uid,title_video))
            }`enter code here`
            catch (e:JSONException){
                Toast.makeText(this,"error",Toast.LENGTH_LONG).show()
            }

        },{ error -> error.printStackTrace() })
        query.add(jsonObject)
    }
    private fun initializingPlayer(youtubePlayer: YouTubePlayerView,str:String){
        youtubePlayer.addYouTubePlayerListener(object : AbstractYouTubePlayerListener() {
            override fun onReady(@NonNull youTubePlayer: YouTubePlayer) {
                val videoId = str
                youTubePlayer.cueVideo(videoId,0f)
            }
        })
        youtubePlayer.getPlayerUiController().setFullScreenButtonClickListener(View.OnClickListener {
            if (youtubePlayer.isFullScreen()) {
                youtubePlayer.exitFullScreen()
                window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_VISIBLE
                // Show ActionBar
                if (supportActionBar != null) {
                    supportActionBar!!.show()
                }
            } else {
                youtubePlayer.enterFullScreen()
                window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN
                // Hide ActionBar
                if (supportActionBar != null) {
                    supportActionBar!!.hide()
                }
            }
        })
    }
}

这是我的主要活动的 XML 文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MathPlayer2">

    <com.pierfrancescosoffritti.androidyoutubeplayer.core.player.views.YouTubePlayerView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/youtubeNewplayer"
        >

    </com.pierfrancescosoffritti.androidyoutubeplayer.core.player.views.YouTubePlayerView>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/mathRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/youtubeNewplayer"
        >

    </androidx.recyclerview.widget.RecyclerView>
</RelativeLayout>

这是我的数据类

package com.example.internproject1

import android.media.Image
import android.widget.ImageView

data class data_math(val uid:String,val title:String) {

}
//,val description:String,val url :String,val width:Int,val height :Int

这是我的 recyclerView 适配器文件

package com.example.internproject1

import android.app.PendingIntent.getActivity
import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.squareup.picasso.Picasso
import org.w3c.dom.Text

class Math_Recycler_Adapter(val details:ArrayList<data_math>):RecyclerView.Adapter<Math_Recycler_Adapter.MathViewHolder>() {

    class MathViewHolder(v: View) :RecyclerView.ViewHolder(v) {
        var VideoTitle:TextView = v.findViewById(R.id.math_title)

    }


    override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): MathViewHolder {
        val itemView = LayoutInflater.from(parent.context)
            .inflate(R.layout.math_recycler_view,parent,false)
        return MathViewHolder(itemView)
    }

    override fun onBindViewHolder(holder: MathViewHolder,position: Int) {
        val detail = details[position]
        holder.VideoTitle.text = detail.title

    }

    override fun getItemCount(): Int {
        return details.size
    }
}

这是 RecyclerView XML 文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.cardview.widget.CardView
        android:id="@+id/cardView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:padding="8dp"
        app:cardCornerRadius="15dp"
        app:cardElevation="8dp"
        android:orientation="vertical"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
        <ImageView
            android:id="@+id/math_thumbnail"
            android:layout_width="180dp"
            android:layout_height="180dp"
            android:layout_margin="10dp"
            android:padding="10dp"
            android:src="@drawable/digital_learning"
            android:scaleType= "fitCenter"
            android:foregroundGravity="center"
            />
        <TextView
            android:id="@+id/math_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textStyle="normal"
            android:textSize="22sp"
            android:textAlignment="textEnd"
            android:layout_below="@+id/math_thumbnail"
            />
            <ImageView
                android:id="@+id/btn_more"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/more"
                android:layout_alignRight="@+id/math_title"
                android:layout_alignTop="@+id/math_title"/>
            <TextView
                android:id="@+id/math_description"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Description"
                android:textSize="22sp"
                android:layout_below="@id/math_title"
                android:gravity="center"
                android:textAlignment="center"/>
        </RelativeLayout>

    </androidx.cardview.widget.CardView>

</androidx.constraintlayout.widget.ConstraintLayout>

这是api数据

{
    "kind": "youtube#videoListResponse","etag": "AQ42JMutl9MwSwr5zWkZJNiFoaM","items": [
        {
            "kind": "youtube#video","etag": "6F4WX_k2_NkRd0js2j7nAdAkhEA","id": "JbhBdOfMEPs","snippet": {
                "publishedAt": "2017-08-02T16:44:44Z","channelId": "UC0cd_-e49hZpWLH3UIwoWRA","title": "Introduction to Mathematics","description": "Everyone hates math,right? Wrong! I like math. Mathematicians like math,presumably. Physicists like math,usually. People who hate math just don't understand it. But like that weird ethnic food you're scared of trying or that odd kid in class that doesn't say much,if you come to understand something it's not so scary. In fact,if we can learn enough about math,we will come to love it","thumbnails": {
                    "default": {
                        "url": "<https://i.ytimg.com/vi/JbhBdOfMEPs/default.jpg>","width": 120,"height": 90
                    },"medium": {
                        "url": "<https://i.ytimg.com/vi/JbhBdOfMEPs/mqdefault.jpg>","width": 320,"height": 180
                    },"high": {
                        "url": "https://i.ytimg.com/vi/JbhBdOfMEPs/hqdefault.jpg","width": 480,"height": 360
                    },"standard": {
                        "url": "https://i.ytimg.com/vi/JbhBdOfMEPs/sddefault.jpg","width": 640,"height": 480
                    },"maxres": {
                        "url": "https://i.ytimg.com/vi/JbhBdOfMEPs/maxresdefault.jpg","width": 1280,"height": 720
                    }
                },"channelTitle": "Professor Dave Explains","tags": [
                    "dave farina","professor dave","professor dave explains","math","mathematics","algebra","geometry","trigonometry","calculus","linear algebra","differential equations","arithmetic","math class","math practice","newton's laws","equation","addition","subtraction","mathematician","subjective","objective","inarguable answers","observation","how much tip to leave"
                ],"categoryId": "27","liveBroadcastContent": "none","localized": {
                    "title": "Introduction to Mathematics",usually. People who hate math just don't understand it. But like that weird ethnic food you're scared of trying,or that odd kid in class that doesn't say much,we will come to love it,because there is so much we can do with it. Watch this series to supplement your math classes,or just to learn enough math that you can become friends. It starts out super easy so don't be afraid! Okay"
                },"defaultAudioLanguage": "en"
            }
        }
    ],"pageInfo": {
        "totalResults": 1,"resultsPerPage": 1
    }
}

在 Gradle 构建之后，我获得了详细信息（我将所有获取的数据一一存储在其中）为空 我认为 gettingRequest 存在问题() 函数在主 kt 文件中。任何人都可以帮我找到问题吗？

解决方法

成功不在api数据中 所以删除这个

val success = it.getBoolean("success")
if(success)
android-volleyget-requestkotlin

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