无法解析 RecyclerView 的方法 setOnItemClickListener

Question

我正在使用 RecyclerView，我正在尝试为 RecyclerView 中的每个项目设置 OnClick 和 OnLongClick。抱歉，但我不认为我真正了解代码的情况，其中一些代码已从我的作业幻灯片中删除，一些补丁用于无法正常工作的内容我在这个网站上找到的。在我的 RecyclerView 适配器 class 的顶部，我有 static OnItemClickListener mItemClickListener;` 然后我有一个新方法的接口，一个设置我的 clicklistener 的方法，然后是我的 ViewHolder 实现，如下所示：

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

    public void setOnItemClickListener(final OnItemClickListener mItemClickListener) {
        this.mItemClickListener = mItemClickListener;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public ImageView movieImage;
        public TextView movieName;
        public TextView movieDescription;
        public CheckBox movieCheckBox;
        public CardView cV;

        public ViewHolder(View view) {
            super(view);

            movieImage = (ImageView) view.findViewById(R.id.movieImg);
            movieName = (TextView) view.findViewById(R.id.movieName);
            movieDescription = (TextView) view.findViewById(R.id.movieDescription);
            movieCheckBox = (CheckBox) view.findViewById(R.id.movieCheckBox);

            view.setOnClickListener(new View.OnClickListener(){
               @Override
                public void onClick(View v) {
                   if (mItemClickListener != null) {
                       if (getAdapterPosition() != RecyclerView.NO_POSITION) {
                           mItemClickListener.onItemClick(v, getAdapterPosition());
                       }
                   }
               }
            });

            view.setOnLongClickListener(new View.OnLongClickListener() {
               @Override
                public boolean onLongClick(View v) {
                   if (mItemClickListener != null) {
                       if (getAdapterPosition() != RecyclerView.NO_POSITION) {
                           mItemClickListener.onItemLongClick(v, getAdapterPosition());
                       }
                   }
                   return true;
               }
            });
        }
    }

我的问题出现在我的片段 class 中，该片段拥有回收器视图，我试图在其中设置 onitemclicklistener。

myAdapter = new MyRecyclerAdapter();

        myAdapter.setOnItemClickListener(new MyRecyclerAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                Log.d("TEST", "onItemClick");
            }

            @Override
            public void onItemLongClick(View view, int position) {
                Log.d("TEST", "onItemLongClick");
            }
        });

它说问题出在 myAdapter.setOnItemClickListener 它说

'Cannot resolve method 'setOnItemClickListener(anonymous com.example.kevin.assignment4.MyRecyclerAdapter.OnItemClickListener)'
但我不知道它为什么这么说。据我所知，它应该能够很好地找到方法。

编辑：我对 MyRecyclerView class 的导入如下：

import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.HashMap;

Answer 1

我试过同样的东西，而且效果很好。检查这个。

public class MyFragment extends BaseFragment implements SwipeRefreshLayout.OnRefreshListener{

    private MyAdapter mAdapter;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        setHasOptionsMenu(true);
        //init views
        final View root = inflater.inflate(R.layout.layout, container, false);
        RecyclerView rv = (RecyclerView) root.findViewById(R.id.recyclerview);

        mAdapter = new MyAdapter(getActivity(), data);
        mAdapter.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                Toast.makeText(getActivity(), "Working...", Toast.LENGTH_LONG).show();
            }
        });
        rv.setAdapter(mAdapter);
        rv.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL));

        return root;
    }

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

    private class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

        private ArrayList<Data> data;
        private Context mContext;

        MyAdapter(Context context, ArrayList<Data> data) {
            this.data = data;
        }

        private OnItemClickListener onItemClickListener;

        public void setOnItemClickListener(OnItemClickListener onItemClickListener){
            this.onItemClickListener = onItemClickListener;
        }

        class MyHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

            MyHolder(View itemView) {
                super(itemView);

                itemView.setOnClickListener(this);
            }

            @Override
            public void onClick(View v) {
                if(onItemClickListener != null){
                    onItemClickListener.onItemClick(v, getAdapterPosition());
                }
            }
        }
    }
}

Answer 2

所以我不确定为什么我原来的方法不起作用，因为我在网上看到过类似的方法，甚至这里发布的其中一个答案也是如此。我通过更改适配器 class 的结构解决了我的问题，以便它将侦听器作为参数传递给 RecyclerView 适配器的构造函数。在那里，我将 class 中的监听器设置为等于进来的监听器。

public MyRecyclerAdapter(ClickListener clickListener) {
        setClickListener(clickListener);
    }

然后在我创建 recyclerview 的片段中

myAdapter = new MyRecyclerAdapter(this);

我的片段 class 从我的适配器 class 实现接口。

Answer 3

不小心将您的适配器声明为 RecyclerView.Adapter 而不是您的自定义适配器 MyRecyclerAdapter() 是一个可能的原因。

RecyclerView.Adapter adapter = new MyRecyclerAdapter()

而不是，

MyRecyclerAdapter adapter = new MyRecyclerAdapter()

Answer 4

我遇到了类似的问题。这段代码解决了我的 problem.Its 来不及回答了，但是这段代码的工作原理就像 magic.This 是我的 java class。

package app.android.dgconnect.activity;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import app.android.dgconnect.R;
import app.android.dgconnect.adapters.AddressBookAdapter;
import app.android.dgconnect.models.CustomersProfileModel;

public class AddressBookMain extends AppCompatActivity implements AdapterView.OnItemClickListener {

    private List<CustomersProfileModel> itemList = new ArrayList<>();
    private AddressBookAdapter mAdapter;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.address_book_layout);

        CustomersProfileModel customersProfileModel=getIntent().getParcelableExtra("customerProfileModel");

        TextView title = findViewById(R.id.title);
        ImageView toolbar_back = findViewById(R.id.toolbar_back);
        title.setText("Address");

        toolbar_back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });
        RecyclerView recyclerView = findViewById(R.id.recycler_view);

        mAdapter = new AddressBookAdapter(itemList,this);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.addItemDecoration(new DividerItemDecoration(getApplicationContext(), LinearLayoutManager.HORIZONTAL));
        recyclerView.setLayoutManager(mLayoutManager);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(mAdapter);
        for(int i=0;i<customersProfileModel.addresses.size();i++){
            itemList.add(customersProfileModel);
            mAdapter.notifyDataSetChanged();
        }

        mAdapter.setOnItemClickListener(this);

    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    }
}

这是我的适配器 class :

package app.android.dgconnect.adapters;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.RadioButton;
import android.widget.TextView;

import java.util.List;

import app.android.dgconnect.R;
import app.android.dgconnect.models.CustomersProfileModel;

public class AddressBookAdapter extends RecyclerView.Adapter<AddressBookAdapter.SingleCheckViewHolder> {

    private List<CustomersProfileModel> itemList;
    private int mSelectedItem = -1;
    private Context mContext;

    private AdapterView.OnItemClickListener onItemClickListener;


    public AddressBookAdapter(List<CustomersProfileModel> itemList, Context context) {
        this.itemList = itemList;
        this.mContext = context;
    }

    @NonNull
    @Override
    public SingleCheckViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        final View view = inflater.inflate(R.layout.address_book_list_row, viewGroup, false);
        return new SingleCheckViewHolder(view, this);
    }


    @Override
    public void onBindViewHolder(@NonNull final SingleCheckViewHolder holder, final int position) {
        CustomersProfileModel items = itemList.get(position);
        holder.address.setText(items.addresses.get(position).street.get(0));

        String rname = items.addresses.get(position).region.region;
        String pcode = items.addresses.get(position).postcode;
        if (rname.equals("string")) {
            holder.address_line_two.setText(pcode);
        } else {
            holder.address_line_two.setText(rname + ", " + pcode);
        }

        try {
            holder.setDateToView(items, position);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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

    public void setOnItemClickListener(AdapterView.OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }


    public void onItemHolderClick(SingleCheckViewHolder holder) {
        if (onItemClickListener != null)
            onItemClickListener.onItemClick(null, holder.itemView, holder.getAdapterPosition(), holder.getItemId());
    }

    class SingleCheckViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        private AddressBookAdapter mAdapter;
        private RadioButton radioButton;
        private TextView address, address_line_two;

        public SingleCheckViewHolder(View itemView, final AddressBookAdapter mAdapter) {
            super(itemView);
            this.mAdapter = mAdapter;

            address = itemView.findViewById(R.id.address);
            address_line_two = itemView.findViewById(R.id.address_line_two);
            radioButton = itemView.findViewById(R.id.radioButton);

            itemView.setOnClickListener(this);
            radioButton.setOnClickListener(this);
        }

        public void setDateToView(CustomersProfileModel item, int position) throws Exception {
            radioButton.setChecked(position == mSelectedItem);
            // mText.setText(item.getPersonName());
        }

        @Override
        public void onClick(View v) {
            mSelectedItem = getAdapterPosition();
            notifyItemRangeChanged(0, itemList.size());
            mAdapter.onItemHolderClick(SingleCheckViewHolder.this);
        }
    }


}

Answer 5

我来晚了，但这可能对某人有所帮助；在尝试使用来自 activity 的适配器的自定义方法时，我遇到了同样的“无法解析符号”问题（为了在 Java，使用 Android Studio 3.3.2）。

令人困惑的是，尽管如此，与此同时，对于我的适配器实例，基础 class RecyclerView.Adapter 自己的方法（例如 getItemCount 和onBindViewHolder ) 可解析。

我的问题是我的代码与 Kevin 的代码相似，其中 Kevin 在他的片段中有：

myAdapter = new MyRecyclerAdapter();

而解决我的问题的是我在实例化适配器时忽略了简单地指定类型 - 例如：

MyRecyclerAdapter myAdapter = new MyRecyclerAdapter();

...'无法解析符号'然后成为过去，我能够访问我的自定义适配器方法，例如 setOnItemClickedListener.

无法解析 RecyclerView 的方法 setOnItemClickListener

Cannot resolve method setOnItemClickListener for RecyclerView

android

onitemclicklistener

android-recyclerview