PokeAPI 没有响应

Posted 2023-02-22

【中文标题】PokeAPI 没有响应

【英文标题】：No response from PokeAPI

【发布时间】：2020-09-29 17:07:07

【问题描述】：

我试图在我的 Pokedex 应用程序中从 Pokeapi 获取 JSONObject，但似乎没有响应并且产生了凌空错误。但是，该链接在显示 JSON 的浏览器中打开得非常好。我尝试了指向 JSON 的不同链接，但它仍然不起作用。 androidManifest 添加了使用互联网的权限。请求被添加到 RequestQueue。问题可能出在哪里？

这是我的 PokedexAdapter 类：

package com.example.pokedex;

import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

public class PokedexAdapter extends RecyclerView.Adapter<PokedexAdapter.PokedexViewHolder> 
    public static class PokedexViewHolder extends RecyclerView.ViewHolder 
        public LinearLayout containerView;
        public TextView textView;

        PokedexViewHolder(View view) 
            super(view);

            containerView = view.findViewById(R.id.pokedex_row);
            textView = view.findViewById(R.id.pokedex_row_text_view);

            containerView.setOnClickListener(new View.OnClickListener() 
                @Override
                public void onClick(View v) 
                    Pokemon current = (Pokemon) containerView.getTag();
                    Intent intent = new Intent(v.getContext(), PokemonActivity.class);
                    intent.putExtra("name", current.getName());
                    //intent.putExtra("number", current.getNumber());

                    v.getContext().startActivity(intent);
                
            );
        
    

    private List<Pokemon> pokemon = new ArrayList<>();
    private RequestQueue requestQueue;

    public PokedexAdapter(Context context) 
        requestQueue = Volley.newRequestQueue(context);
        loadPokemon();
    

    public void loadPokemon() 
        String url = "https://pokeapi.co/api/v2/pokemon?limit=151";
        JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
                new Response.Listener<JSONObject>() 
                    @Override
                    public void onResponse(JSONObject response) 
                        try 
                            JSONArray results = response.getJSONArray("results");
                            for (int i = 0; i < results.length(); i++) 
                                JSONObject result = results.getJSONObject(i);
                                pokemon.add(new Pokemon(
                                        result.getString("name"),
                                        result.getString("url")));
                            

                            notifyDataSetChanged();
                         catch (JSONException e) 
                            Log.e("cs50", "onResponse: ", e);
                        
                    
                , new Response.ErrorListener() 
            @Override
            public void onErrorResponse(VolleyError error) 
                Log.d("cs50", "onErrorResponse: pokemon list error");
            
        );
        requestQueue.add(request);
    

    @NonNull
    @Override
    public PokedexViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) 
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.pokedex_row, parent, false);
        return new PokedexViewHolder(view);
    

    @Override
    public void onBindViewHolder(@NonNull PokedexViewHolder holder, int position) 
        Pokemon current = pokemon.get(position);
        holder.textView.setText(current.getName());
        holder.containerView.setTag(current);
    

    @Override
    public int getItemCount() 
        return pokemon.size();
    

AndroidManifest：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.pokedex">    
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".PokemonActivity"></activity>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

结果 - 屏幕上没有显示任何内容并产生此错误：

2020-06-09 19:09:37.469 15137-15137/com.example.pokedex D/cs50：onErrorResponse：口袋妖怪列表错误

【参考方案1】：

通过重新安装应用程序解决了问题。

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