我需要在RecyclerView上设置onClickListener，它获取项目的Json Id Clicked并重定向到片段，该片段根据该Json ID显示产品的详细信息。我如何在适配器中实现它？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()));
}
}
答案 0 :(得分：2)
@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
}
});
}
注意：从ViewHolder中删除onclick侦听器
答案 1 :(得分：1)
尝试使用以下课程，您可以获得recyclerview 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) {
}
}
现在将lister添加到recyclerview，就像这样
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) {
}
})
);
如果有任何疑问，请询问我
答案 2 :(得分：1)
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
}
}
在ViewHolder构造函数中添加。
答案 3 :(得分：0)
您可以在OnCkick方法中添加Ad ad = ads.get(RecyclerAdapter.MyViewHolder.this.getAdapterPosition());以检索当前对象。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....
}
答案 4 :(得分：0)
您的适配器类应如下所示。
您必须从onClickListener课程中删除ViewHolder。并点击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
}
}
}