Android | 当RecyclerView项目被点击时弹出AlertDialog

Question

我已经实现了RecyclerView。现在我想在RecyclerView的某个项目被点击时显示AlertDialog。我尝试了很多方法，但都没有成功。

这是我的Adapter类：

public class SearchResultAdapter extends RecyclerView.Adapter<SearchResultAdapter.MyViewHolder> {
private List<Searchresult> resultList;

public class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView item1, item2, item3;

    public MyViewHolder(View view) {
        super(view);
        item1 = (TextView) view.findViewById(R.id.item1);
        item2 = (TextView) view.findViewById(R.id.item2);
        item3 = (TextView) view.findViewById(R.id.item3);
    }
}

public SearchResultAdapter(List<Searchresult> resultList) {
    this.resultList = resultList;
}

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

@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
    Searchresult result = resultList.get(position);
    holder.item1.setText(result.getItem1());
    holder.item2.setText(result.getItem2());
    holder.item3.setText(result.getItem3());
}

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

AlertDialog 应该显示 item1、item2 和 item3。请帮我在 RecyclerView 上实现一个 onClickListener。

- Nidhin Radh

Answer 1

问题在于，你还需要像下面给出的示例一样将context传递给适配器构造函数

 public SearchResultAdapter(List<Searchresult> resultList , Context context) {
    this.resultList = resultList;
    this.context = context
    }

在您的Activity中，如果您像下面这样启动适配器，请使用:

SearchResultAdapter madapter = new SearchResultAdapter (List, this);

那么在您的onBindViewHolder方法中

@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
    Searchresult result = resultList.get(position);
     holder.item1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //pass the 'context' here
            AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);
            alertDialog.setTitle("Your title");
            alertDialog.setMessage("your message ");
            alertDialog.setPositiveButton("CANCEL", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });
            alertDialog.setNegativeButton("YES", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {

                    // DO SOMETHING HERE

                }
            });

            AlertDialog dialog = alertDialog.create();
            dialog.show();
        }
    });
}

- Omar Dhanish

Answer 2

以下代码用于打开警报对话框：

  holder.item1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                AlertDialog.Builder builder1 = new AlertDialog.Builder(getActivity());
                builder1.setMessage("Do you want to remove ?");
                builder1.setCancelable(true);

                builder1.setPositiveButton(
                        "Yes",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) 
                             {                        
                         //Do your code...
                               }
                        });

                builder1.setNegativeButton(
                        "No",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                dialog.cancel();
                            }
                        });

                AlertDialog alert11 = builder1.create();
                alert11.show();
            }
        });

- Vishal Vaishnav

Answer 3

尝试创建一个名为RecyclerItemClickListener的类，如下所示：

  package com.ncrypted.recyclerviewwithindex;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;


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) {
    }
}

将点击侦听器附加到 RecyclerView，就像这样：

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

                @Override
                public void onItemClick(View view, int position) {
                    // show your alert Dailog here
                   }

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

                }
            })
    );

- AskNilesh