Android Studio - от темы до AsyncTask - PullRequest
Новая
       11

Android Studio - от темы до AsyncTask

0 голосов
/ 29 января 2020

У меня есть тема, и я пытаюсь преобразовать ее в AsyncTask. Это мой начальный код:

municipioFragment. java

package com.example.is2_app.ui.municipio;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.example.is2_app.R;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class municipioFragment extends Fragment {

    private List<News> lstNews;

    private OnListFragmentInteractionListener mListener;

    public municipioFragment() {
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        lstNews = new ArrayList<>();  


    }

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_municipio_list, container, false);

        // Set the adapter
        MymunicipioRecyclerViewAdapter recyclerViewAdapter = null;
        if (view instanceof RecyclerView) {
            Context context = view.getContext();
            RecyclerView recyclerView = (RecyclerView) view;

            recyclerView.setLayoutManager(new LinearLayoutManager(context));

            recyclerViewAdapter = new MymunicipioRecyclerViewAdapter(lstNews, mListener);
            recyclerView.setAdapter(recyclerViewAdapter);

        }
        getURL(recyclerViewAdapter);
        return view;
    }


    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnListFragmentInteractionListener) {
            mListener = (OnListFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnListFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }



    public interface OnListFragmentInteractionListener {
        // TODO: Update argument type and name
        void onListFragmentInteraction(News item);
    }

    public void getURL(final MymunicipioRecyclerViewAdapter recyclerViewAdapter) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Document doc = Jsoup.connect("http://www.comune.candida.av.it").get();
                    Element content = doc.getElementById("b370");
                    Elements subcontent = content.getElementsByTag("p");
                    Elements links = subcontent.select("a[href]");

                    int i=0;

                    for (Element link : links) {
                        i=i+1;
                        lstNews.add(new News(Integer.toString(i),link.text(),link.attr("href")));
                    }

                        getActivity().runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                recyclerViewAdapter.updateData(lstNews);
                            }
                        });

                }catch (IOException e) {
                    Element news_text = null;
                    news_text.append("Error: ").append(e.getMessage()).append("\n");
                }
            }
        }).start();
    }

}

Это код, который я написал, пытаясь преобразовать поток в AsyncTask:

ComuneInfoTask. java

package com.example.is2_app.tasks;

import android.os.AsyncTask;
import android.util.Log;

import com.example.is2_app.interfaces.NetworkResponseListener;
import com.example.is2_app.ui.municipio.MymunicipioRecyclerViewAdapter;
import com.example.is2_app.ui.municipio.News;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import com.example.is2_app.ui.municipio.municipioFragment;


public class ComuneInfoTask extends AsyncTask<List<News>, String, List<News>> {

    private NetworkResponseListener networkResponseListener;

    public ComuneInfoTask (NetworkResponseListener networkResponseListener){
        this.networkResponseListener=networkResponseListener;
    }


    @Override
    protected List<News> doInBackground(List<News>... lists) {
        List<News> lstNews;
        lstNews = new ArrayList<>();
        try {
            Document doc = Jsoup.connect("http://www.comune.candida.av.it").get();
            Element content = doc.getElementById("b370");
            Elements subcontent = content.getElementsByTag("p");
            Elements links = subcontent.select("a[href]");

            int i = 0;

            for (Element link : links) {
                i = i + 1;
                lstNews.add(new News(Integer.toString(i), link.text(), link.attr("href")));
                Log.d("Element added to list",link.text());
            }

        } catch (IOException e) {
            e.printStackTrace();    

        }
        return lstNews;
    }



    protected void onProgressUpdate(Void ... progress) {

        super.onProgressUpdate();
    }

    protected void onPreExecuted() {
        super.onPreExecute();
    }

    protected void onPostExecute(List<News> lstNews) {


        Log.d("Executing: ", "onPostExecute");

        super.onPostExecute(lstNews);
        if(lstNews!= null){
            networkResponseListener.SuccessData(lstNews);
            Log.d("lstNews ", "success");

        }
        else {
            networkResponseListener.FailedData();
            Log.d("lstNews ", "failed");
        }

    }

}

municipioFragment. java

становится: 

    package com.example.is2_app.ui.municipio;

import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.example.is2_app.MainActivity;
import com.example.is2_app.R;
import com.example.is2_app.interfaces.NetworkResponseListener;
import com.example.is2_app.tasks.ComuneInfoTask;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class municipioFragment extends Fragment implements NetworkResponseListener {

    private NetworkResponseListener networkResponseListener;
    private List<News> lstNews;

    private OnListFragmentInteractionListener mListener;


    public municipioFragment() {
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        lstNews = new ArrayList<>();   

    }

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_municipio_list, container, false);

        // Set the adapter
        MymunicipioRecyclerViewAdapter recyclerViewAdapter = null;
        if (view instanceof RecyclerView) {
            Context context = view.getContext();
            RecyclerView recyclerView = (RecyclerView) view;

            recyclerView.setLayoutManager(new LinearLayoutManager(context));

            recyclerViewAdapter = new MymunicipioRecyclerViewAdapter(lstNews, mListener);
            recyclerView.setAdapter(recyclerViewAdapter);

        }
        getURL();
        recyclerViewAdapter.updateData(lstNews);
        Log.d("AsyncTask terminated :", "ok");
        return view;
    }


    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnListFragmentInteractionListener) {
            mListener = (OnListFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnListFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    @Override
    public void SuccessData(List<News> data) {
    Log.d("Response:","ok");
    }

    @Override
    public void FailedData() {

    }

    public interface OnListFragmentInteractionListener {
        // TODO: Update argument type and name
        void onListFragmentInteraction(News item);
    }

    public void getURL() {

        ComuneInfoTask comuneInfoTask = new ComuneInfoTask(municipioFragment.this);
        comuneInfoTask.execute();
        Log.d("Info:","task eseguito");

    }

}

Интерфейс NewtworkResponseListener. java

package com.example.is2_app.interfaces;

import com.example.is2_app.ui.municipio.News;

import java.util.List;

public interface NetworkResponseListener {

    void SuccessData(List<News> data);

    void FailedData();

}

MymunicipioRecyclerViewAdapter. java

package com.example.is2_app.ui.municipio;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import androidx.recyclerview.widget.RecyclerView;

import com.example.is2_app.R;
import com.example.is2_app.ui.municipio.municipioFragment.OnListFragmentInteractionListener;

import java.util.List;


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


    private final OnListFragmentInteractionListener mListener;
    List<News> mData;

    public MymunicipioRecyclerViewAdapter(List<News> mData, OnListFragmentInteractionListener listener) {
        this.mData = mData;
        this.mListener = listener;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.fragment_municipio, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        holder.mContentView.setText(mData.get(position).getId());
        holder.mContentView.setText(mData.get(position).getContent());

        holder.mView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (null != mListener) {
                    // Notify the active callbacks interface (the activity, if the
                    // fragment is attached to one) that an item has been selected.
                    mListener.onListFragmentInteraction(holder.mItem);
                   Toast toast = Toast.makeText(v.getContext(),mData.get(position).getLink() , Toast.LENGTH_LONG);
                   toast.show();
                }
            }
        });
    }

    @Override
    public int getItemCount() {
        return mData.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        public final View mView;
        public final TextView mContentView;
        public News mItem;

        public ViewHolder(View view) {
            super(view);
            mView = view;
            mContentView = view.findViewById(R.id.content);

        }

        @Override
        public String toString() {
            return super.toString() + " '" + mContentView.getText() + "'";
        }
    }

    public void updateData(List<News> mData) {
        this.mData = mData;
        this.notifyDataSetChanged();
    }
}

Приложение запускается, но когда я пытаюсь покажите фрагмент Municipio, он зависает и ничего не показывает ... Как я могу решить эту проблему?

...