关于RecylerView OnclickListener并获取被点击项目的ID

Question

我需要在RecyclerView上设置onClickListener，它可以获取被点击项目的Json Id并重定向到显示基于该Json ID的产品细节的片段。我如何在适配器中实现这一点？我被困在这里。我能够设置onClickListener，但我无法获得Json ID。

这是我的适配器。

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 android.widget.Toast; 

import com.bumptech.glide.Glide; 
import com.example.dell.retroexample.MainActivity; 
import com.example.dell.retroexample.R; 
import com.example.dell.retroexample.apiHandlers.model.Ad; 

import java.util.List; 

/** 
* Created by dell on 7/3/2017. 
*/ 

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder>{ 

    private List<Ad> ads; 
    private Context context; 



    public RecyclerAdapter(List<Ad> ads, Context context){ 
     this.ads=ads; 
     this.context=context; 

    } 


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

    @Override 
    public void onBindViewHolder(MyViewHolder holder, int position) { 
     holder.name.setText(ads.get(position).getTitle()); 
     holder.details.setText("Rs. " +ads.get(position).getPrice().toString()+ "/-"); 
//  Glide.with(context).load(ads.get(position).getPhoto1()).into(holder.thumbnail); 



    } 

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




    public static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ 

     ImageView thumbnail; 
     TextView name, details; 
     public MyViewHolder(View itemView) { 
      super(itemView); 
//   thumbnail=(ImageView)itemView.findViewById(R.id.thumbnail); 
      name=(TextView)itemView.findViewById(R.id.title); 
      details=(TextView)itemView.findViewById(R.id.price); 
      itemView.setOnClickListener(this); 
     } 

     @Override 
     public void onClick(View view) { 
      Toast.makeText(view.getContext(), "Clicked on Recycler View" , Toast.LENGTH_SHORT).show(); 
     } 



    } 
} 

这是我的MainActivity

package com.example.dell.retroexample; 

import android.content.res.Resources; 
import android.graphics.Rect; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.DefaultItemAnimator; 
import android.support.v7.widget.GridLayoutManager; 
import android.support.v7.widget.LinearLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.util.DisplayMetrics; 
import android.util.Log; 
import android.util.TypedValue; 
import android.view.View; 

import com.example.dell.retroexample.apiHandlers.adapter.RecyclerAdapter; 
import com.example.dell.retroexample.apiHandlers.model.Ad; 
import com.example.dell.retroexample.apiHandlers.rest.ApiInterface; 
import com.example.dell.retroexample.apiHandlers.rest.ApiClient; 

import java.util.List; 

import retrofit2.Call; 
import retrofit2.Callback; 
import retrofit2.Response; 

public class MainActivity extends AppCompatActivity { 
    private static final String TAG = MainActivity.class.getSimpleName(); 
    private RecyclerView recyclerView; 
    private RecyclerView.LayoutManager layoutManager; 
    private RecyclerAdapter adapter=null; 
    private List<Ad> ads; 
    private ApiInterface apiInterface; 



    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 


     recyclerView=(RecyclerView)findViewById(R.id.ads_recycler_view); 
       // calculating the number of columns 
     int columns=2; 
     DisplayMetrics lDisplayMetrics = getResources().getDisplayMetrics(); 
     double widthPixels = lDisplayMetrics.widthPixels; 
     Log.e("Width", String.valueOf(widthPixels)); 
     columns=(int)widthPixels/dpToPx(170); 


     RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, columns); 
     recyclerView.setLayoutManager(mLayoutManager); 
     recyclerView.setItemAnimator(new DefaultItemAnimator()); 


     apiInterface=ApiClient.getClient().create(ApiInterface.class); 

     Call <List<Ad>> call=apiInterface.getads(); 

     call.enqueue(new Callback<List<Ad>>() { 
      @Override 
      public void onResponse(Call<List<Ad>> call, Response<List<Ad>> response) { 
       ads=response.body(); 
       adapter=new RecyclerAdapter(ads, MainActivity.this); 
       recyclerView.setAdapter(adapter); 
      } 

      @Override 
      public void onFailure(Call<List<Ad>> call, Throwable t) { 

       Log.e(TAG, t.toString()); 
      } 
     }); 




    } 

    private int dpToPx(int dp) { 
     Resources r = getResources(); 
     return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, r.getDisplayMetrics())); 
    } 

} 

Answer 1

@Override 
    public void onBindViewHolder(MyViewHolder holder, int position) { 
     holder.name.setText(ads.get(position).getTitle()); 
     holder.details.setText("Rs. " +ads.get(position).getPrice().toString()+ "/-");  Glide.with(context).load(ads.get(position).getPhoto1()).into(holder.thumbnail); 
     holder.itemView.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       String id=ads.get(position).getId(); 
       //You can call detail fragment here 
      } 
     }); 
    } 

注：从ViewHolder

删除的onclick听众

Answer 2

尝试这种使用下面的类，你可以得到recyclerview的onclick监听器和longclick listneeers

创建RecyclerItemClickListener类

public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener { 
private OnItemClickListener mListener; 

public interface OnItemClickListener { 
    public void onItemClick(View view, int position); 

    public void onLongItemClick(View view, int position); 
} 

GestureDetector mGestureDetector; 

public RecyclerItemClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener) { 
    mListener = listener; 
    mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() { 
     @Override 
     public boolean onSingleTapUp(MotionEvent e) { 
      return true; 
     } 

     @Override 
     public void onLongPress(MotionEvent e) { 
      View child = recyclerView.findChildViewUnder(e.getX(), e.getY()); 
      if (child != null && mListener != null) { 
       mListener.onLongItemClick(child, recyclerView.getChildAdapterPosition(child)); 
      } 
     } 
    }); 
} 

@Override 
public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) { 
    View childView = view.findChildViewUnder(e.getX(), e.getY()); 
    if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) { 
     mListener.onItemClick(childView, view.getChildAdapterPosition(childView)); 
     return true; 
    } 
    return false; 
} 

@Override 
public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) { 
} 


@Override 
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { 
} 
} 

现在添加利斯特到recyclerview这样

 indexRecyclerView.addOnItemTouchListener(
      new RecyclerItemClickListener(MainActivity.this, indexRecyclerView, new RecyclerItemClickListener.OnItemClickListener() { 

       @Override 
       public void onItemClick(View view, int position) { 
        /// perform your action here 


       } 

       @Override 
       public void onLongItemClick(View view, int position) { 

       } 
      }) 
    ); 

问我任何查询

Answer 3

的情况下，试试这个：

itemView.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        int position = getLayoutPosition(); 
        String id=ads.get(position).getId(); 
        // call fragment 
       } 
} 

将其添加到ViewHolder构造函数中。

Answer 4

您可以在您的OnCkick方法中添加Ad ad = ads.get(RecyclerAdapter.MyViewHolder.this.getAdapterPosition());来检索当前对象。然后使用Interface将值传递给片段。

@Override 
      public void onClick(View view) { 
       Toast.makeText(view.getContext(), "Clicked on Recycler View" , Toast.LENGTH_SHORT).show(); 
       Ad ad = ads.get(RecyclerAdapter.MyViewHolder.this.getAdapterPosition()); 
       //use interface to pass ad to the fragment.... 
      } 

Answer 5

您的适配器类应如下所示。

您必须从ViewHolder类中删除onClickListener。并设置点击onBindViewHolder方法。

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder>{ 

    private List<Ad> ads; 
    private Context context; 



    public RecyclerAdapter(List<Ad> ads, Context context){ 
     this.ads=ads; 
     this.context=context; 

    } 


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

    @Override 
    public void onBindViewHolder(MyViewHolder holder, int position) { 
     holder.name.setText(ads.get(position).getTitle()); 
     holder.details.setText("Rs. " +ads.get(position).getPrice().toString()+ "/-"); 
//  Glide.with(context).load(ads.get(position).getPhoto1()).into(holder.thumbnail); 
     holder.linearLayout.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       /*Write your code here to send data to fragment*/ 
       Ad ad = ads.get(position); 
      } 
     }); 


    } 

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




    public static class MyViewHolder extends RecyclerView.ViewHolder{ 

     ImageView thumbnail; 
     TextView name, details; 
     LinearLayout linearLayout; 
     public MyViewHolder(View itemView) { 
      super(itemView); 
//   thumbnail=(ImageView)itemView.findViewById(R.id.thumbnail); 
      name=(TextView)itemView.findViewById(R.id.title); 
      details=(TextView)itemView.findViewById(R.id.price); 
      linearLayout=(TextView)itemView.findViewById(R.id.linearLayout); // its your main layout 
     } 



    } 
}