java - 如何将 json 数组从 recyclerView 传递到另一个 Activity

Question

我想要在 ListView 中显示通过 Volley 从 MainActivity Recycler View 获取的 JsonArray 数据，并将其传递给另一个 Activity 。这意味着我的 MainActivity 通过 recyclerView 托管，点击 recyclerView Item 我得到了一个特定的数组，我想将目标数组传递给另一个 Activity 并显示为 ListView/RecyclerView

我不明白该怎么做! 这些是我的代码:主要 Activity

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;
import android.widget.*;
import android.support.fragment.*;
import com.mycompany.myapp2.R;
import android.net.*;
import android.content.*;
import com.mycompany.myapp2.*;
import com.android.volley.toolbox.*;
import com.android.volley.*;
import org.json.*;
import com.mycompany.myapp2.adapters.*;
import android.app.*;
import com.mycompany.myapp2.Model.*;

/////
//

/*

 /**
 * A simple {@link Fragment} subclass.
 */
public class HomeFragment extends Fragment
{

    /* privates  */
    //"https://gogoanime.now.sh/api/v1/OngoingSeries"; //"http://jakir.me/files/user.json";
    private RecyclerView mRecyclerView;
    private ExampleAdapter mExampleAdapter;
    private ArrayList<ExampleItem> mExampleList;
    private RequestQueue mRequestQueue;
    private ProgressDialog loadingPop;
    public HomeFragment()
    {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState)
    {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_home, container, false);


    mRecyclerView = view.findViewById(R.id.recycler_view);
    mRecyclerView.setHasFixedSize(true);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    mExampleList = new ArrayList<>();
    mRequestQueue = Volley.newRequestQueue(getActivity());

    loadingPop = new ProgressDialog(getActivity());
    loadingPop.setTitle("Loading...");
    loadingPop.setMessage("Please wait retrieving data from server");
    loadingPop.setCanceledOnTouchOutside(false);
    loadingPop.show();


    String url = "https://gogoanime.now.sh/api/v1/OngoingSeries";
    JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
        new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response)
        {
            try
            {



            JSONArray jsonArray = response.getJSONArray("anime");

            for (int i = 0; i < jsonArray.length(); i++)
            {
                JSONObject hit = jsonArray.getJSONObject(i);
                String title = hit.getString("title");
                String img = hit.getString("img");
                String synopsis = hit.getString("synopsis");



                /*JSONArray genresArray = hit.getJSONArray("genres");
                String[] genres = new String[genresArray.length()];
                for(int j = 0; j < genresArray.length(); j++){
                genres[j] = genresArray.getString(i);
                }*/

                        String release = hit.getString("released");
                        String status = hit.getString("status");
                        String otherName = hit.getString("otherName");
                        String totalEpisodes = hit.getString("totalEpisodes");

                JSONArray episodesArray = hit.getJSONArray("episodes");
                String[] ids = new String[episodesArray.length()];
                for(int e = 0; e < episodesArray.length(); e++){
                ids[e] = episodesArray.getJSONObject(e).getString("id");
                }

                mExampleList.add(new ExampleItem(title,img, synopsis,// genres,
                release, status, otherName, totalEpisodes));
                loadingPop.dismiss();
                Toast.makeText(getActivity(), "Data Refreshed", Toast.LENGTH_SHORT).show();
            }
            mExampleAdapter = new ExampleAdapter(getActivity(), mExampleList);
            mRecyclerView.setAdapter(mExampleAdapter);
            Toast.makeText(getActivity(), "Added Data", Toast.LENGTH_SHORT).show();
            //loadingPop.dismiss();

            }
            catch (JSONException e)
            {
            e.printStackTrace();
            Toast.makeText(getActivity(), "Catch" + e, Toast.LENGTH_LONG).show();
            loadingPop.dismiss();

            }}
        }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error)
        {
            if (error instanceof NetworkError)
            {
            }
            else if (error instanceof ServerError)
            {
            }
            else if (error instanceof AuthFailureError)
            {
            }
            else if (error instanceof ParseError)
            {
            }
            else if (error instanceof NoConnectionError)
            {
            }
            else if (error instanceof TimeoutError)
            {
            Toast.makeText(getContext(),
                       "Oops. Timeout error!",
                       Toast.LENGTH_LONG).show();
            }
        }
        }
    );
    request.setRetryPolicy(new DefaultRetryPolicy(
                   10000,
                   DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
                   DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    mRequestQueue.add(request);
        //ids
    return view;
    }}

适配器

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;


import java.util.ArrayList;
import com.mycompany.myapp2.R;
import com.bumptech.glide.*;
import com.mycompany.myapp2.*;
import com.mycompany.myapp2.Model.*;
import android.content.*;


public class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {
    private Context mContext;
    private ArrayList<ExampleItem> mExampleList;

  public ExampleAdapter(Context context, ArrayList<ExampleItem> exampleList) {
    mContext = context;
    mExampleList = exampleList;
    }

   @Override
    public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(mContext).inflate(R.layout.example_item, parent, false);
    return new ExampleViewHolder(v);
    }

    @Override
    public void onBindViewHolder(ExampleViewHolder holder, int position) {
    final ExampleItem currentItem = mExampleList.get(position);

    String title = currentItem.getTitle();
    String img = currentItem.getImg();
    String synopsis = currentItem.getSynopsis();
    //String[] genres = currentItem.getGenre();
    String release = currentItem.getRelease();
    String status = currentItem.getStatus();
    String otherName = currentItem.getOtherName();
    String totalEpisodes = currentItem.getTotalEpisodes();

    holder.mTitle.setText(title);
    holder.mSynopis.setText(synopsis);
    //holder.mGenre.setText(genres);
    holder.mRelease.setText(release);
    holder.mStatus.setText(status);
    holder.mOtherName.setText(otherName);
    holder.mTotalEpisodes.setText(totalEpisodes);


    Glide.with(mContext).
    load(img).
    into(holder.mImg);

    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // user selected product now you can show details of that product 
            Intent intent = new Intent(view.getContext(), OnGoingDetails.class);

            String SName = currentItem.getTitle();
            String SGenre = currentItem.getSynopsis();
            String SRating = currentItem.getImg();

            intent.putExtra("Name",SName);
            intent.putExtra("Genre", SGenre);
            intent.putExtra("Rating",SRating);

            view.getContext().startActivity(intent);
        }
        });




    }

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

    public class ExampleViewHolder extends RecyclerView.ViewHolder {
    public ImageView mImg;

    public TextView mTitle ;
    public TextView mSynopis;
    public TextView mGenre ;
    public TextView mRelease ;
    public TextView mStatus ;
    public TextView mOtherName ;
    public TextView mTotalEpisodes ;

    public ExampleViewHolder(View itemView) {
        super(itemView);
        mTitle = itemView.findViewById(R.id.title);
       mImg=itemView.findViewById(R.id.thumbnail);
        mSynopis = itemView.findViewById(R.id.synopsis);
        mGenre = itemView.findViewById(R.id.genre);
        mRelease = itemView.findViewById(R.id.released);
        mStatus = itemView.findViewById(R.id.status);
        mOtherName = itemView.findViewById(R.id.otherName);
        mTotalEpisodes=itemView.findViewById(R.id.totalEpisodes);

}}}

模型类

public class ExampleItem {
   private String mTitle;
    private String mImg;
    private String mSynopsis;
   // private String[] mGenre;
    private String mRelease;
    private String mStatus;
    private String mOtherName;
    private String mTotalEpisodes;
   // private String mIds[];
   // private String mEP;


    public ExampleItem(String title,String img,String synopsis,//String[] genres,
    String released,String status,String otherName,String totalEpisodes){


    /*public ExampleItem(String title, String img, String synopsis, String[] genres, String release, String status, String otherName, String totalEpisodes
 ,String[] ids  )*/ 
       mTitle = title;
    mImg=img;
        mSynopsis = synopsis;
      //  mGenre = genres;
    mRelease = released;
    mStatus = status;
    mOtherName = otherName;
    mTotalEpisodes = totalEpisodes;

    }

  public String getTitle() {
        return mTitle;
    }

    public String getImg() {
        return mImg;
    }

    public String getSynopsis() {
        return mSynopsis;
    }

  /*  public String[] getGenre() {
        return mGenre;

    }*/
    public String getRelease() {
        return mRelease;
    }
    public String getStatus() {
        return mStatus;

    }
    public String getOtherName() {
        return mOtherName;
    }
   public String getTotalEpisodes() {
        return mTotalEpisodes;
    }

}

请解决我的问题

Answer 1

您可以修改模型以实现 Parcelable，如下所示

public class ExampleItem implements Parcelable {
private String mTitle;
private String mImg;
private String mSynopsis;
private String mRelease;
private String mStatus;
private String mOtherName;
private String mTotalEpisodes;



public ExampleItem(String title,String img,String synopsis,
                   String released,String status,String otherName,String totalEpisodes){



    mTitle = title;
    mImg=img;
    mSynopsis = synopsis;
    //  mGenre = genres;
    mRelease = released;
    mStatus = status;
    mOtherName = otherName;
    mTotalEpisodes = totalEpisodes;

}

protected ExampleItem(Parcel in) {
    mTitle = in.readString();
    mImg = in.readString();
    mSynopsis = in.readString();
    mRelease = in.readString();
    mStatus = in.readString();
    mOtherName = in.readString();
    mTotalEpisodes = in.readString();
}

public static final Creator<ExampleItem> CREATOR = new Creator<ExampleItem>() {
    @Override
    public ExampleItem createFromParcel(Parcel in) {
        return new ExampleItem(in);
    }

    @Override
    public ExampleItem[] newArray(int size) {
        return new ExampleItem[size];
    }
};

public String getTitle() {
    return mTitle;
}

public String getImg() {
    return mImg;
}

public String getSynopsis() {
    return mSynopsis;
}

/*  public String[] getGenre() {
      return mGenre;

  }*/
public String getRelease() {
    return mRelease;
}
public String getStatus() {
    return mStatus;

}
public String getOtherName() {
    return mOtherName;
}
public String getTotalEpisodes() {
    return mTotalEpisodes;
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(mTitle);
    dest.writeString(mOtherName);
    dest.writeString(mImg);
    dest.writeString(mRelease);
    dest.writeString(mStatus);
    dest.writeString(mSynopsis);
    dest.writeString(mTotalEpisodes);
}}

并在您的适配器中执行此操作

Intent intent = new Intent(view.getContext(), OnGoingDetails.class);
       intent.putParcelableArrayListExtra("list", (ArrayList<? extends Parcelable>) exampleItems)); 
        view.getContext().startActivity(intent);

以及您的 OnGoingDetails Activity

 List<ExampleItem> exampleItems = getIntent().getParcelableArrayListExtra("list");