RecyclerView拒绝将数据发送到NextActivity

Question

这是我的Adapter类

public class NtindaCinemaAdapter  extends    RecyclerView.Adapter<NtindaCinemaViewHolders>{
    private   String url="http://10.0.2.2/UgandaEntertainment/Ntinda/NtindaPics/";
    private List<ItemObjects> itemList = null;
    private Context context;


    private ArrayList<ItemObjects> arraylist;
    public NtindaCinemaAdapter(Context context, List<ItemObjects> itemList) {
        this.itemList = itemList;
        this.context = context;
    }

    @Override
    public NtindaCinemaViewHolders onCreateViewHolder(ViewGroup parent, int viewType) {

        View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.ntinda_cinema_list, parent,false);
        NtindaCinemaViewHolders rcv = new NtindaCinemaViewHolders(layoutView,context);
        return rcv;
    }

    @Override
    public void onBindViewHolder(NtindaCinemaViewHolders holder, int position) {
        ItemObjects feedItem = itemList.get(position);
              ViewGroup parent;
        //Download image using picasso library

        Picasso.with(context).load(url+feedItem.getPhoto())
                .error(R.drawable.placeholder).
                resize(500,500)
                .placeholder(R.drawable.placeholder)

                .into(holder.moviepic);

        holder.moviename.setText(itemList.get(position).getMovieName());
    }

    @Override
    public int getItemCount() {
        return (null != itemList ? itemList.size() : 0);
    }
}

这是我的ViewHolderClass问题所在，我试图按照同一问题发布在这里的每篇帖子，但我没有得到正确答案。
我希望它像一个带有OnItemClickListener功能的listView 它将数据发送到NextActivity

package oerrride.we.huzykamz.ugentapp;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.Serializable;
import java.util.List;

import adapters.NtindaCinemaAdapter;


public class NtindaCinemaViewHolders extends RecyclerView.ViewHolder  {

    public TextView moviename;
    public ImageView moviepic;
    public static String KEY_SYNOPSIS="Synopsis";
    View root;
    private List<ItemObjects> itemList1 = null;


    public NtindaCinemaViewHolders(final View itemView, final Context c) {
        super(itemView);
        root = itemView;

        root.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            /*   Toast.makeText(c,"Clicked"+getPosition(),Toast.LENGTH_LONG).show();*/

                ItemObjects feedItem = (ItemObjects) v.getTag();
                Intent intent = new Intent(c, MovieScrollingActivity.class);

                intent.putExtra(KEY_SYNOPSIS, feedItem.getSynopsis());
                c.startActivity(intent);

            }
        });


        moviename = (TextView) itemView.findViewById(R.id.ntinda_cinema_txt);
        moviepic = (ImageView) itemView.findViewById(R.id.ntinda_cinema_photo);
    }
}

这是我的NextActivity类

package oerrride.we.huzykamz.ugentapp;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.TextView;

import com.squareup.picasso.Picasso;

public class MovieScrollingActivity extends AppCompatActivity {

    TextView  synpsis_txt;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_scrolling);

        getSupportActionBar().setDisplayShowHomeEnabled(false);
        android.support.v7.app.ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.hide();

        synpsis_txt = (TextView) findViewById(R.id.synopsis_txt);

        Bundle bundle = getIntent().getExtras();
        synpsis_txt.setText(bundle.getString(NtindaCinemaViewHolders.KEY_SYNOPSIS));

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab2);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });


    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

这是我的模特课

package oerrride.we.huzykamz.ugentapp;

public class ItemObjects {
    private String CinemaName;
    private String CinemaxPhoto;
    private String contact;
    private String longitude;
    private String latitude;
    private String MovieName;
    private String Synopsis;
    private String Others;
    private String photo;
    private String Monday;
    private String Tuesday;
    private String Wednesday;
    private String Thursday;
    private String Friday;
    private String Saturday;
    private String Sunday;
    private String ActorsName;
    private String ActorsPhoto;


    public String getCinemaName() {
        return CinemaName;
    }

    public void setCinemaName(String cinemaName) {
        CinemaName = cinemaName;
    }

    public String getCinemaxPhoto() {
        return CinemaxPhoto;
    }

    public void setCinemaxPhoto(String cinemaxPhoto) {
        CinemaxPhoto = cinemaxPhoto;
    }

    public String getContact() {
        return contact;
    }

    public void setContact(String contact) {
        this.contact = contact;
    }

    public String getLongitude() {
        return longitude;
    }

    public void setLongitude(String longitude) {
        this.longitude = longitude;
    }

    public String getLatitude() {
        return latitude;
    }

    public void setLatitude(String latitude) {
        this.latitude = latitude;
    }

    public String getMovieName() {
        return MovieName;
    }

    public void setMovieName(String movieName) {
        MovieName = movieName;
    }

    public String getSynopsis() {
        return Synopsis;
    }

    public void setSynopsis(String synopsis) {
        Synopsis = synopsis;
    }

    public String getOthers() {
        return Others;
    }

    public void setOthers(String others) {
        Others = others;
    }

    public String getPhoto() {
        return photo;
    }

    public void setPhoto(String photo) {
        this.photo = photo;
    }

    public String getMonday() {
        return Monday;
    }

    public void setMonday(String monday) {
        Monday = monday;
    }

    public String getTuesday() {
        return Tuesday;
    }

    public void setTuesday(String tuesday) {
        Tuesday = tuesday;
    }

    public String getWednesday() {
        return Wednesday;
    }

    public void setWednesday(String wednesday) {
        Wednesday = wednesday;
    }

    public String getThursday() {
        return Thursday;
    }

    public void setThursday(String thursday) {
        Thursday = thursday;
    }

    public String getFriday() {
        return Friday;
    }

    public void setFriday(String friday) {
        Friday = friday;
    }

    public String getSaturday() {
        return Saturday;
    }

    public void setSaturday(String saturday) {
        Saturday = saturday;
    }

    public String getSunday() {
        return Sunday;
    }

    public void setSunday(String sunday) {
        Sunday = sunday;
    }

    public String getActorsName() {
        return ActorsName;
    }

    public void setActorsName(String actorsName) {
        ActorsName = actorsName;
    }

    public String getActorsPhoto() {
        return ActorsPhoto;
    }

    public void setActorsPhoto(String actorsPhoto) {
        ActorsPhoto = actorsPhoto;
    }
}

这是显示的错误消息

 08-02 11:49:12.123 1775-1775/? E/AndroidRuntime: FATAL EXCEPTION: main
 Process: oerrride.we.huzykamz.ugentapp, PID: 1775
 java.lang.NullPointerException
     at oerrride.we.huzykamz.ugentapp.NtindaCinemaViewHolders$1.onClick(NtindaCinemaViewHolders.java:52)
     at android.view.View.performClick(View.java:4438)
     at android.view.View$PerformClick.run(View.java:18422)
     at android.os.Handler.handleCallback(Handler.java:733)
     at android.os.Handler.dispatchMessage(Handler.java:95)
     at android.os.Looper.loop(Looper.java:136)
     at android.app.ActivityThread.main(ActivityThread.java:5001)
     at java.lang.reflect.Method.invokeNative(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:515)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
     at dalvik.system.NativeStart.main(Native Method)

Answer 1

我认为你应该将点击监听器移动到适配器中，这样你就可以将对象从arraylist中取出。

您的问题是v.getTag();返回null，因为该视图没有设置标记。

@Override
public void onBindViewHolder(NtindaCinemaViewHolders holder, int position) {
    final ItemObjects feedItem = itemList.get(position);

    holder.root.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(NtindaCinemaAdapter.this.context, MovieScrollingActivity.class);
            intent.putExtra(NtindaCinemaViewHolders.KEY_SYNOPSIS, feedItem.getSynopsis());

            c.startActivity(intent);
        }
    });

    //Download image using picasso library
    Picasso.with(context).load(url+feedItem.getPhoto())
            .error(R.drawable.placeholder).
            resize(500,500)
            .placeholder(R.drawable.placeholder)
            .into(holder.moviepic);

    holder.moviename.setText(feedItem.getMovieName());
}

Answer 2

尝试在开始活动之前添加此行

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);