Question

我是android的新手，我从db获取数据并在recycleler视图中显示。如何获取项目的价值。我能够获得这个位置，但我不确定如何获得这个价值。

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Collections;
import java.util.List;

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

    private Context context;
    private LayoutInflater inflater;
    List<DataSearch> data= Collections.emptyList();
    DataSearch current;

    // create constructor to initialize context and data sent from MainActivity
    public AdapterSearch(Context context, List<DataSearch> data){
        this.context=context;
        inflater= LayoutInflater.from(context);
        this.data=data;
    }

    // Inflate the layout when ViewHolder created
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view=inflater.inflate(R.layout.container_search, parent,false);
        MyHolder holder=new MyHolder(view);
        return holder;
    }

    // Bind data
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        // Get current position of item in RecyclerView to bind data and assign values from list
        MyHolder myHolder= (MyHolder) holder;
        DataSearch current=data.get(position);
        myHolder.textsanctname.setText(current.sanctname);
        myHolder.textstate.setText("State " + current.state);
        myHolder.textType.setText("Category " + current.catagory);


    }

    // return total item from List
    @Override
    public int getItemCount() {
        return data.size();
    }


    class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

        TextView textsanctname;
        TextView textstate;
        TextView textType;


        // create constructor to get widget reference
        public MyHolder(View itemView) {
            super(itemView);
            textsanctname= (TextView) itemView.findViewById(R.id.textsanctname);
            textstate = (TextView) itemView.findViewById(R.id.textstate);
            textType = (TextView) itemView.findViewById(R.id.textType);

            itemView.setOnClickListener(this);
        }



        // Click event for all items
        @Override
        public void onClick(View v) {

            Toast.makeText(context, "You clicked "+getPosition(),Toast.LENGTH_SHORT).show();

        }

    }

}

提前致谢。

Answer 1

您需要使用getter和setter

创建Model类

Modelclass.java

public class FeaturedContentModel {
String featuredContent;

public String getFeaturedContent() {
    return featuredContent;
}

public void setFeaturedContent(String featuredContent) {
    this.featuredContent = featuredContent;
}

}

在您的适配器实现中单击侦听器

MyAdapter.java

public class FeaturedContentAdapter extends RecyclerView.Adapter<FeaturedContentAdapter.ViewHolder> {
ArrayList<FeaturedContentModel> featuredContentModelArrayList;
FeaturedContentModel featuredContentModel;
Context mContext;
FeaturedContentAdapter.OnClickInterface onClickInterface;

public FeaturedContentAdapter(ArrayList<FeaturedContentModel> featuredContentModelArrayList, Context mContext, OnClickInterface onClickInterface) {
    this.featuredContentModelArrayList = featuredContentModelArrayList;
    this.mContext = mContext;
    this.onClickInterface = onClickInterface;
}

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

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    featuredContentModel = featuredContentModelArrayList.get(position);

    holder.tv_featured_content_name.setText(featuredContentModel.getFeaturedContent());
}

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

public class ViewHolder extends RecyclerView.ViewHolder {
    TextView tv_featured_content_name;
    public ViewHolder(View itemView) {
        super(itemView);
        tv_featured_content_name = (TextView) itemView.findViewById(R.id.tv_featured_contents_name);

        itemView.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                // get position
                int pos = getAdapterPosition();
                FeaturedContentModel featuredContentModel=featuredContentModelArrayList.get(pos);
                onClickInterface.setOnClick(featuredContentModel);

                // check if item still exists
                if(pos != RecyclerView.NO_POSITION){
                    FeaturedContentModel clickedDataItem = featuredContentModelArrayList.get(pos);
                    Toast.makeText(v.getContext(), "Clicked ", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }
}

public interface OnClickInterface{
    void setOnClick(FeaturedContentModel featuredContentModel);
}

}

主要Activity.java

RecyclerView.Adapter adapter = new FeaturedContentAdapter(featuredContentModelArrayList, FeaturedContent.this, new FeaturedContentAdapter.OnClickInterface() {
        @Override
        public void setOnClick(FeaturedContentModel featuredContentModel) {
            startActivity(new Intent(FeaturedContent.this,DetailsContentActivity.class).putExtra("title",featuredContentModel.getFeaturedContent()));
        }
    });
    featuredContentsRecyclerView.setAdapter(adapter);

Answer 2

    // Click event for all items
    @Override
    public void onClick(View v) {
        DataSearch clickedData = data.get(getPosition()); 
        Toast.makeText(context, "You clicked "+clickedData.getXXX(),Toast.LENGTH_SHORT).show();


    }

将值分配给变量，您可以在Toast中显示该值。

Answer 3

找到解决方案

写下这门课程

        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){}
        }

在您的活动中写

recyclerView.addOnItemTouchListener(new RecyclerItemClickListener(this, recyclerView, new RecyclerItemClickListener.OnItemClickListener() {
                @Override
                public void onItemClick(View view, int position) {

                   Log.d("position",position);
                }

                @Override
                public void onLongItemClick(View view, int position) {
                    // do whatever
                }
            })
    );

Answer 4

将您的代码更改为此。在这里，如果您点击“textsanctname”视图，则值将以toast

显示

onActivityResult()

在android中的recycler视图中显示clicked值

4 个答案: