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パッケージを誤ってオーバーライドする

このエラーが発生しています。

03-22 11：41：20.439 20933-20933/com.androidcss.jsonexample E/RecyclerView：アダプターが接続されていません。レイアウトをスキップ03-22 11：41：20.760 20933-20933/com.androidcss.jsonexample W/art：Before Android 4.1、method int Android.support.v7.widget.ListViewCompat.lookForSelectablePosition（ int、boolean）Android.widget.ListViewのpackage-privateメソッドを誤ってオーバーライドした

MainActivity.Java

package com.androidcss.jsonexample;

import Android.app.ProgressDialog;
import Android.os.AsyncTask;
import Android.support.v7.app.AppCompatActivity;
import Android.os.Bundle;
import Android.support.v7.widget.LinearLayoutManager;
import Android.support.v7.widget.RecyclerView;
import Android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import Java.io.BufferedReader;
import Java.io.IOException;
import Java.io.InputStream;
import Java.io.InputStreamReader;
import Java.net.HttpURLConnection;
import Java.net.MalformedURLException;
import Java.net.URL;
import Java.util.ArrayList;
import Java.util.List;

public class MainActivity extends AppCompatActivity {

    // CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
    public static final int CONNECTION_TIMEOUT = 10000;
    public static final int READ_TIMEOUT = 15000;
    private RecyclerView mRVFishPrice;
    private AdapterFish mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //Make call to AsyncTask
        new AsyncLogin().execute();


    }

    private class AsyncLogin extends AsyncTask<String, String, String> {
        ProgressDialog pdLoading = new ProgressDialog(MainActivity.this);
        HttpURLConnection conn;
        URL url = null;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            //this method will be running on UI thread
            pdLoading.setMessage("\tLoading...");
            pdLoading.setCancelable(false);
            pdLoading.show();

        }

        @Override
        protected String doInBackground(String... params) {
            try {

                // Enter URL address where your json file resides
                // Even you can make call to php file which returns json data
                url = new URL("https://newsapi.org/v1/articles?source=the-next-web&sortBy=latest&apiKey=bdba5de1b490495796a1595f77ed3f37");

            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                return e.toString();
            }
            try {

                // Setup HttpURLConnection class to send and receive data from php and mysql
                conn = (HttpURLConnection) url.openConnection();
                conn.setReadTimeout(READ_TIMEOUT);
                conn.setConnectTimeout(CONNECTION_TIMEOUT);
                conn.setRequestMethod("GET");

                // setDoOutput to true as we recieve data from json file
                conn.setDoOutput(true);

            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
                return e1.toString();
            }

            try {

                int response_code = conn.getResponseCode();

                // Check if successful connection made
                if (response_code == HttpURLConnection.HTTP_OK) {

                    // Read data sent from server
                    InputStream input = conn.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                    StringBuilder result = new StringBuilder();
                    String line;

                    while ((line = reader.readLine()) != null) {
                        result.append(line);
                    }

                    // Pass data to onPostExecute method
                    return (result.toString());

                } else {

                    return ("unsuccessful");
                }

            } catch (IOException e) {
                e.printStackTrace();
                return e.toString();
            } finally {
                conn.disconnect();
            }


        }

        @Override
        protected void onPostExecute(String result) {

            //this method will be running on UI thread

            pdLoading.dismiss();
            List<Item> data=new ArrayList<>();

            pdLoading.dismiss();
            try {

                JSONObject object= new JSONObject(result);
                JSONArray array = object.getJSONArray("articles");

                // Extract data from json and store into ArrayList as class objects
                for(int i=0;i<array.length();i++){
                    JSONObject json_data = array.getJSONObject(i);
                    Item item= new Item();
                    item.name= json_data.getString("title");

                    data.add(item);
                }

                // Setup and Handover data to recyclerview
                mRVFishPrice = (RecyclerView)findViewById(R.id.fishPriceList);
                mAdapter = new AdapterFish(MainActivity.this, data);
                mRVFishPrice.setAdapter(mAdapter);
                mRVFishPrice.setLayoutManager(new LinearLayoutManager(MainActivity.this));

            } catch (JSONException e) {
                Toast.makeText(MainActivity.this, e.toString(), Toast.LENGTH_LONG).show();
            }

        }

    }
}

AdapterFish.Java

package com.androidcss.jsonexample;

import Android.content.Context;
import Android.support.v4.content.ContextCompat;
import Android.support.v7.widget.RecyclerView;
import Android.view.LayoutInflater;
import Android.view.View;
import Android.view.ViewGroup;
import Android.widget.TextView;
import com.bumptech.glide.Glide;
import Java.util.Collections;
import Java.util.List;

public class AdapterFish extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private Context context;
    private LayoutInflater inflater;
    List<Item> data= Collections.emptyList();
    Item current;
    int currentPos=0;

    // create constructor to innitilize context and data sent from MainActivity
    public AdapterFish(Context context, List<Item> data){
        this.context=context;
        inflater= LayoutInflater.from(context);
        this.data=data;
    }

    // Inflate the layout when viewholder created
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view=inflater.inflate(R.layout.card, parent,false);
        MyHolder holder=new MyHolder(view);
        return holder;
    }

    // Bind data
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        // Get current position of item in recyclerview to bind data and assign values from list
        MyHolder myHolder= (MyHolder) holder;
        Item current=data.get(position);

        myHolder.name.setText(current.getName());

        // load image into imageview using glide
        /*Glide.with(context).load("http://192.168.1.7/test/images/" + current.fishImage)
                .placeholder(R.drawable.ic_img_error)
                .error(R.drawable.ic_img_error)
                .into(myHolder.ivFish);*/

    }

    // return total item from List
    @Override
    public int getItemCount() {
        return data.size();
    }


    class MyHolder extends RecyclerView.ViewHolder{

        TextView name;


        // create constructor to get widget reference
        public MyHolder(View itemView) {
            super(itemView);
            name = (TextView)itemView.findViewById(R.id.name);


        }

    }

}

Item.Java

package com.androidcss.jsonexample;

public class Item {

    String name;

    public String getName() {
        return name;
    }
}
javaandroidoverriding
10
Kartik Sharma

setLayoutManagerの前にsetAdapterが必要です。

4
Zarul Izham

RecyclerViewのAsynTaskを初期化しています。つまり、ビューの作成時にReyclerViewの準備ができていません。

次の変更を行います。

//make list as global variable
private List<Item> data;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //view should be initialized in UI thread
    data=new ArrayList<>();
    mRVFishPrice = (RecyclerView)findViewById(R.id.fishPriceList);
    mAdapter = new AdapterFish(MainActivity.this, data);
    mRVFishPrice.setLayoutManager(new LinearLayoutManager(MainActivity.this));
    mRVFishPrice.setAdapter(mAdapter);

    //Make call to AsyncTask
    new AsyncLogin().execute();
}

その後、onPostExecuteに

置換-

mRVFishPrice = (RecyclerView)findViewById(R.id.fishPriceList);
mAdapter = new AdapterFish(MainActivity.this, data);
mRVFishPrice.setAdapter(mAdapter);
mRVFishPrice.setLayoutManager(new LinearLayoutManager(MainActivity.this));

と

mAdapter.notifyDatasetChanged();

また、List<Item> dataをpostexecuteから削除し、グローバルにするようにしてください

また、カスタムバックグラウンドタスクを実装する代わりに、Volleyを使用してAPI呼び出しを行ってください。 Volleyは、実際のコードを台無しにすることなく、API呼び出しを非同期的に処理します。

1
Mohammed Atif

私は同じ問題に直面しました。問題はレイアウトにありました。ビューとレイアウトが正しい順序になっているかどうかを最初に確認する必要があります。

1
Jatin Shara