Question

我正在使用RecyclerView，我正在尝试为RecyclerView中的每个项目设置OnClick＆On;和OnLongClick＆＃39。我道歉但我不认为我真正了解代码发生了什么，其中一些是我的作业的幻灯片和一些不会工作的补丁我在这个网站上找到的。在我的RecyclerView Adapter类的顶部我有静态OnItemClickListener mItemClickListener;`然后我有一个接口用于我的新方法，一个设置我的clicklistener的方法，然后我的ViewHolder实现如下：

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的类中，该片段拥有recycleler视图，我试图设置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");
            }
        });

它表示问题出在myAdapter.setOnItemClickListener上，它说出了'Cannot resolve method 'setOnItemClickListener(anonymous com.example.kevin.assignment4.MyRecyclerAdapter.OnItemClickListener)'但我不知道为什么会这样说。据我所知，应该能够找到合适的方法。

编辑：我对MyRecyclerView类的导入如下：

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

我尝试了同样的事情并且工作很酷。检查一下。

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的原始方法不起作用，因为我在网上看到了类似的方法，甚至这里发布的答案之一也是一样的。我通过更改我的适配器类的结构解决了我的问题，以便它将侦听器作为RecyclerView适配器的构造函数的参数。在那里，我将类中的侦听器设置为等于进入的侦听器。

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

然后在我创建了recyclelerview的片段中

myAdapter = new MyRecyclerAdapter(this);

我的片段类实现了我的适配器类的接口。

Answer 3

偶然将您的适配器声明为RecyclerView.Adapter而不是自定义适配器MyRecyclerAdapter（）是可能的原因。

RecyclerView.Adapter adapter = new MyRecyclerAdapter()

而不是

MyRecyclerAdapter adapter = new MyRecyclerAdapter()

Answer 4

我遇到了类似的问题。此代码解决了我的问题。为时已晚，但该代码却像魔术一样工作。这是我的java类。

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) {

    }
}

这是我的适配器类：

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

我为时已晚，但这可能会帮助某人；在尝试从活动中使用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（为了使用Java Studio，使用Android Studio 3.3.2为RecyclerView设置点击监听器，）。

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

我的问题是我与Kevin的代码相似，Kevin在他的片段中有：

myAdapter = new MyRecyclerAdapter();

解决我问题的是，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'成为过去，我能够访问自定义的Adapter方法，例如 setOnItemClickedListener 。

无法为RecyclerView解析方法setOnItemClickListener

5 个答案: