RecyclerView 的 OnItemClickListener [重复]

Question

我想在我的RecyclerView 中添加项目点击监听器，这样当我点击某个项目时，它会启动一个新的Intent 并从网络服务器检索有关该项目的数据。我尝试了很多建议，但都没有帮助。

我的 RecylerView 类

public class GetPrice extends AppCompatActivity {
private RecyclerView recyclerView;
private GridLayoutManager gridLayoutManager;
private  CustomAdapter adapter;
private List<MyData> dataList;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.getpricerecycle);
    recyclerView =(RecyclerView) findViewById(R.id.recycler_view);

    dataList = new ArrayList<>();
    load_data_from_server(0);
    gridLayoutManager = new GridLayoutManager(this,1);
    recyclerView.setLayoutManager(gridLayoutManager);
    adapter = new CustomAdapter(this,dataList);
    recyclerView.setAdapter(adapter);

}

private void load_data_from_server(final int id) {
    AsyncTask<Integer,Void,Void> task = new AsyncTask<Integer, Void, Void>() {
        @Override
        protected Void doInBackground(Integer... params) {
            OkHttpClient client = new OkHttpClient();
            Request request = new Request.Builder().url("http://172.20.10.7/anfal/getPrice.php?id="+id).build();
            try {
                Response response = client.newCall(request).execute();
                JSONArray array = new JSONArray(response.body().string());
                for(int i=0;i<array.length();i++ ){
                    JSONObject jsonobject = array.getJSONObject(i);
                    MyData data=new MyData(jsonobject.getInt("id"),jsonobject.getString("name"),jsonobject.getString("price"),jsonobject.getString("image"));
                    dataList.add(data);
                }
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                System.out.println("End Of Content");
            }


            return null;
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            adapter.notifyDataSetChanged();
        }
    };
task.execute(id);

}

这是我用于回收站视图的 coustm 适配器

public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {                                                                 
        private Context context;
        private List<MyData> my_data;
        public CustomAdapter(Context context, List<MyData> my_data) {
        this.context = context;
        this.my_data = my_data;
    }

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

    }
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
           holder.name.setText(my_data.get(position).getName());
           holder.price.setText(my_data.get(position).getPrice());


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

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView name;
        public TextView price;
        public ImageView imageview;
        public ViewHolder(View itemView) {
            super(itemView);
            name=(TextView)itemView.findViewById(R.id.description);
            price=(TextView) itemView.findViewById(R.id.nameofp);
            imageview=(ImageView) itemView.findViewById(R.id.imgevie);
        }
    }

}

Answer 1

实现recyclerview的item点击最简单的方法是在适配器的onBindViewHolder方法中实现。

@Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, final int position) {
       vh.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //use position value  to get clicked data from list
            }
        });
    }

Answer 2

在您的RecyclerView.Adapter 中简单地创建一个您可以使用的界面。

private onItemClickListener mItemClickListener;

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

public interface onItemClickListener {
    void onItemClickListener(View view, int position, MyData myData);
}

在这种情况下，mItemClickListener 是适配器内部的一个全局变量，这两个方法也在适配器内部。

然后在您的ViewHolder 中，使用itemView.setOnClickListener(this)（或您希望单击以检索数据的任何组件）对您的itemView 应用点击侦听器

@Override
public void onClick(View view) {
    if (mItemClickListener != null) {
        mItemClickListener.onItemClickListener(view, getAdapterPosition(), my_data.get(getAdapterPosition()));
    }
}

然后，这将传递已单击的视图、所述视图的位置以及该位置内列表中包含的对象。

因此，在您的Activity 中，您只需调用interface。

adapter.setOnItemClickListener(new CustomAdapter.onItemItemClickListener() {
    @Override
    public void onItemClickListener(View view, int position, MyData data) {
    //do on item click functionality here
    }
});

Answer 3

第一种方法

recyclerViewObject.addOnItemTouchListener(
        new RecyclerItemClickListener(
            getContext(),
            recyclerViewObject,
            new RecyclerItemClickListener.OnItemClickListener() {
                @Override public void onItemClick(View view, int position) {
                    // view is the clicked view (the one you wanted
                    // position is its position in the adapter
                }
                @Override public void onLongItemClick(View view, int position) {
                }
            }
        )
    );

第二种方式

public interface PositionClickListener {
    void itemClicked(int position); }

在适配器中

public class MyRecyclerAdapter extends RecyclerView.Adapter
{
    public final PositionClickListener listener;

    public MyRecyclerAdapter(PositionClickListener listener)
    {
         this.listener = listener;
    }

    private void createView(int position)
    {
        View v = new View();
        v.setOnClickListener(new OnClickListener(){
            listener.itemClicked(position);
        });
    }
}

Reference

Answer 4

实际上，使用 recyclerView 和 OnClickListener 的最佳做法是这样做：

在你的活动中：

//Add this line in the onCreate method
//Add more parameters if needed for your adapter
DataAdapter myDataAdapter = new DataAdapter (context, myClickListener);


private View.OnClickListener myClickListener = new View.OnClickListener()
{
    @Override
    public void onClick(View view)
    {
        int position = view.getTag()
        //Do something...
    }
};

在你的适配器中

private View.OnClickListener myClickListener;
private Context context;

 public DataAdapter (Context context, View.OnClickListener myClickListener)
{
    this.context = context;
    this.myClickListener = myClickListener;
}

public class ViewHolder extends RecyclerView.ViewHolder 
{

    //Your attributes

    public myViewHolder(View v, View.OnClickListener myClickListener) 
    {
        super(v);
        v.setOnClickListener(myClickListener);
    }
}

@Override
public void onBindViewHolder(myViewHolder holder, int position)
{
    holder.itemView.setTag(position)
}

当然，它适用于任何类型的 clickListener。

希望有帮助！！

Answer 5

你可以改变 ViewHolder

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

            name=(TextView)itemView.findViewById(R.id.description);
            price=(TextView) itemView.findViewById(R.id.nameofp);
            imageview=(ImageView) itemView.findViewById(R.id.imgevie);



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

                // Here is the action


                }
            });


        }

Answer 6

在 CustomAdapter.ViewHolder 中的 itemView 中添加点击事件

即itemView.setOnClickListener() 和里面的 onClick() 方法获取点击项的位置是这样的：

getAdapterPosition()