为什么RecyclerView没有onItemClickListener()？

Question

我正在探索RecyclerView,我很惊讶地看到RecyclerView它没有onItemClickListener().因为RecyclerView延伸

android.view.ViewGroup

并ListView扩展

android.widget.AbsListView

.不过,我解决我的问题写onClick在我的RecyclerView.Adapter:

public static class ViewHolder extends RecyclerView.ViewHolder implements OnClickListener {

    public TextView txtViewTitle;
    public ImageView imgViewIcon;

    public ViewHolder(View itemLayoutView) {
        super(itemLayoutView);
        txtViewTitle = (TextView) itemLayoutView.findViewById(R.id.item_title);
        imgViewIcon = (ImageView) itemLayoutView.findViewById(R.id.item_icon);
    }

    @Override
    public void onClick(View v) {

    }
}

但我仍然想知道为什么谷歌被删除了onItemClickListener()？

是否有性能问题或其他问题？

Answer 1

tl; dr 2016使用RxJava和PublishSubject公开点击的Observable.

public class ReactiveAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    String[] mDataset = { "Data", "In", "Adapter" };

    private final PublishSubject<String> onClickSubject = PublishSubject.create();

    @Override 
    public void onBindViewHolder(final ViewHolder holder, int position) {
        final String element = mDataset[position];

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               onClickSubject.onNext(element);
            }
        });
    }

    public Observable<String> getPositionClicks(){
        return onClickSubject.asObservable();
    }
}

原帖:

自推出以来ListView,onItemClickListener一直存在问题.当你有任何内部元素的点击监听器时,不会触发回调但是没有通知或记录良好(如果有的话),所以存在很多混淆和SO问题.

鉴于RecyclerView它更进一步,并没有行/列的概念,而是任意布局的子项数量,他们已经将onClick委托给它们中的每一个,或者程序员实现.

可以认为Recyclerview不是ListView1:1的替代品,而是复杂用例的更灵活的组件.正如你所说,你的解决方案是谷歌对你的期望.现在你有一个适配器谁可以委托的onClick对构造函数,这是两者的正确的方式传递的接口ListView和Recyclerview.

public static class ViewHolder extends RecyclerView.ViewHolder implements OnClickListener {

    public TextView txtViewTitle;
    public ImageView imgViewIcon;
    public IMyViewHolderClicks mListener;

    public ViewHolder(View itemLayoutView, IMyViewHolderClicks listener) {
        super(itemLayoutView);
        mListener = listener;
        txtViewTitle = (TextView) itemLayoutView.findViewById(R.id.item_title);
        imgViewIcon = (ImageView) itemLayoutView.findViewById(R.id.item_icon);
        imgViewIcon.setOnClickListener(this);
        itemLayoutView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (v instanceof ImageView){
           mListener.onTomato((ImageView)v);
        } else {
           mListener.onPotato(v);
        }
    }

    public static interface IMyViewHolderClicks {
        public void onPotato(View caller);
        public void onTomato(ImageView callerImage);
    }

}

然后在你的适配器上

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

   String[] mDataset = { "Data" };

   @Override
   public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
       View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.my_layout, parent, false);

       MyAdapter.ViewHolder vh = new ViewHolder(v, new MyAdapter.ViewHolder.IMyViewHolderClicks() { 
           public void onPotato(View caller) { Log.d("VEGETABLES", "Poh-tah-tos"); };
           public void onTomato(ImageView callerImage) { Log.d("VEGETABLES", "To-m8-tohs"); }
        });
        return vh;
    }

    // Replace the contents of a view (invoked by the layout manager) 
    @Override 
    public void onBindViewHolder(ViewHolder holder, int position) {
        // Get element from your dataset at this position 
        // Replace the contents of the view with that element 
        // Clear the ones that won't be used
        holder.txtViewTitle.setText(mDataset[position]);
    } 

    // Return the size of your dataset (invoked by the layout manager) 
    @Override 
    public int getItemCount() { 
        return mDataset.length;
    } 
  ...

现在看看最后一段代码:onCreateViewHolder(ViewGroup parent, int viewType)签名已经提出了不同的视图类型.对于它们中的每一个,您也需要不同的视图持有者,并且随后每个视图持有者可以具有不同的点击集.或者,您可以创建一个通用视图,它可以获取任何视图和一个视图并onClickListener相应地应用.或者将一个级别委派给协调器,以便多个片段/活动具有相同的列表,具有不同的单击行为.同样,所有的灵活性都在你身边.

它是一个非常需要的组件,与我们ListView迄今为止的内部实现和改进非常接近.谷歌最终承认这一点很好.

Answer 2

另一种解决方案是由Android GDE的Hugo Visser 提出的解决方案.他为您提供了免费许可课程,您只需输入代码并使用它即可.

用法:

recyclerView.onItemClick { recyclerView, position, v ->
    // do it
}

(它还支持长项目点击)

实施(评论由我添加):

typealias OnRecyclerViewItemClickListener = (recyclerView: RecyclerView, position: Int, v: View) -> Unit
typealias OnRecyclerViewItemLongClickListener = (recyclerView: RecyclerView, position: Int, v: View) -> Boolean

class ItemClickSupport(private val recyclerView: RecyclerView) {

    private var onItemClickListener: OnRecyclerViewItemClickListener? = null
    private var onItemLongClickListener: OnRecyclerViewItemLongClickListener? = null

    private val attachListener: RecyclerView.OnChildAttachStateChangeListener by lazy {
        object : RecyclerView.OnChildAttachStateChangeListener {
            override fun onChildViewAttachedToWindow(view: View) {
                // every time a new child view is attached add click listeners to it
                val holder = this@ItemClickSupport.recyclerView.getChildViewHolder(view)
                        .takeIf { it is ItemClickSupportViewHolder } as? ItemClickSupportViewHolder

                if (onItemClickListener != null && holder?.isClickable != false) {
                    view.setOnClickListener(onClickListener)
                }
                if (onItemLongClickListener != null && holder?.isLongClickable != false) {
                    view.setOnLongClickListener(onLongClickListener)
                }
            }

            override fun onChildViewDetachedFromWindow(view: View) {

            }
        }
    }

    init {
        // the ID must be declared in XML, used to avoid
        // replacing the ItemClickSupport without removing
        // the old one from the RecyclerView
        this.recyclerView.setTag(R.id.item_click_support, this)
        this.recyclerView.addOnChildAttachStateChangeListener(attachListener)
    }

    companion object {
        fun addTo(view: RecyclerView): ItemClickSupport {
            // if there's already an ItemClickSupport attached
            // to this RecyclerView do not replace it, use it
            var support: ItemClickSupport? = view.getTag(R.id.item_click_support) as? ItemClickSupport
            if (support == null) {
                support = ItemClickSupport(view)
            }
            return support
        }

        fun removeFrom(view: RecyclerView): ItemClickSupport? {
            val support = view.getTag(R.id.item_click_support) as? ItemClickSupport
            support?.detach(view)
            return support
        }
    }

    private val onClickListener = View.OnClickListener { v ->
        val listener = onItemClickListener ?: return@OnClickListener
        // ask the RecyclerView for the viewHolder of this view.
        // then use it to get the position for the adapter
        val holder = this.recyclerView.getChildViewHolder(v)
        listener.invoke(this.recyclerView, holder.adapterPosition, v)
    }

    private val onLongClickListener = View.OnLongClickListener { v ->
        val listener = onItemLongClickListener ?: return@OnLongClickListener false
        val holder = this.recyclerView.getChildViewHolder(v)
        return@OnLongClickListener listener.invoke(this.recyclerView, holder.adapterPosition, v)
    }

    private fun detach(view: RecyclerView) {
        view.removeOnChildAttachStateChangeListener(attachListener)
        view.setTag(R.id.item_click_support, null)
    }

    fun onItemClick(listener: OnRecyclerViewItemClickListener?): ItemClickSupport {
        onItemClickListener = listener
        return this
    }

    fun onItemLongClick(listener: OnRecyclerViewItemLongClickListener?): ItemClickSupport {
        onItemLongClickListener = listener
        return this
    }

}

/** Give click-ability and long-click-ability control to the ViewHolder */
interface ItemClickSupportViewHolder {
    val isClickable: Boolean get() = true
    val isLongClickable: Boolean get() = true
}

// Extension function
fun RecyclerView.addItemClickSupport(configuration: ItemClickSupport.() -> Unit = {}) = ItemClickSupport.addTo(this).apply(configuration)

fun RecyclerView.removeItemClickSupport() = ItemClickSupport.removeFrom(this)

fun RecyclerView.onItemClick(onClick: OnRecyclerViewItemClickListener) {
    addItemClickSupport { onItemClick(onClick) }
}
fun RecyclerView.onItemLongClick(onLongClick: OnRecyclerViewItemLongClickListener) {
    addItemClickSupport { onItemLongClick(onLongClick) }
}

还创建一个文件ItemClickSupportViewHolder并将其放入其中:

class MyViewHolder(view): RecyclerView.ViewHolder(view), ItemClickSupportViewHolder {
    override val isClickable: Boolean get() = false
    override val isLongClickable: Boolean get() = false
}

这个类通过附加ViewHolder到values/ids.xml.每次儿童被附加或分离时,都会通知该听众RecyclerView.OnChildAttachStateChangeListener.代码使用此选项将点击/长按侦听器附加到视图.这听众问RecyclerView了RecyclerView其中包含的位置.

如果您需要更多,您还可以调整代码以便为您提供支持.

请记住,通过在列表的每个视图上设置一个点击监听器,就像其他建议的答案一样,在您的适配器中处理它完全没问题.这不是最有效的事情(每次重复使用视图时都会创建一个新的侦听器),但它可以工作,在大多数情况下它不是问题.

关于为什么 RecyclerView没有RecyclerView.ViewHolder.

这onItemClickListener是一个工具箱,RecyclerView与之相反,它具有较少的功能构建和更大的灵活性.这ListView不是从ListView中删除的唯一功能.但它有很多听众和方法可以根据自己的喜好扩展它,它在右手中更强大;).

在我看来,删除的最复杂的功能onItemClickListener是快速滚动.大多数其他功能可以轻松重新实现.

Answer 3

我喜欢这种方式而且我正在使用它

内

public Adapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)

放

View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_image_and_text, parent, false);
v.setOnClickListener(new MyOnClickListener());

并在任何你想要的地方创建这个类

class MyOnClickListener implements View.OnClickListener {
    @Override
    public void onClick(View v) {
       int itemPosition = recyclerView.indexOfChild(v);
       Log.e("Clicked and Position is ",String.valueOf(itemPosition));
    }
}

我以前读过有更好的方法,但我喜欢这种方式很容易而且不复杂.

Answer 4

Android Recyclerview With onItemClickListener,为什么我们不能尝试这个只是工作ListView.

来源:链接

public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {

private OnItemClickListener mListener;
public interface OnItemClickListener {
    public void onItemClick(View view, int position);
}
GestureDetector mGestureDetector;
public RecyclerItemClickListener(Context context, OnItemClickListener listener) {
    mListener = listener;
    mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            return true;
        }
    });
}
@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 false;
}

@Override
public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) {
}

@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

  }
}

并将其设置为RecyclerView:

    recyclerView = (RecyclerView)rootView. findViewById(R.id.recyclerView);
    RecyclerView.LayoutManager mLayoutManager = new            LinearLayoutManager(getActivity());
    recyclerView.setLayoutManager(mLayoutManager);
    recyclerView.addOnItemTouchListener(
            new RecyclerItemClickListener(getActivity(), new   RecyclerItemClickListener.OnItemClickListener() {
                @Override
                public void onItemClick(View view, int position) {
                    // TODO Handle item click
                    Log.e("@@@@@",""+position);
                }
            })
    );

Answer 5

感谢@marmor,我更新了我的答案.

我认为在ViewHolder类构造函数中处理onClick()并通过OnItemClickListener接口将其传递给父类是一个很好的解决方案.

MyAdapter.java

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

private LayoutInflater layoutInflater;
private List<MyObject> items;
private AdapterView.OnItemClickListener onItemClickListener;

public MyAdapter(Context context, AdapterView.OnItemClickListener onItemClickListener, List<MyObject> items) {
    layoutInflater = LayoutInflater.from(context);
    this.items = items;
    this.onItemClickListener = onItemClickListener;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = layoutInflater.inflate(R.layout.my_row_layout, parent, false);
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    MyObject item = items.get(position);
}

public MyObject getItem(int position) {
    return items.get(position);
}


class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    private TextView title;
    private ImageView avatar;

    public ViewHolder(View itemView) {
        super(itemView);
        title = itemView.findViewById(R.id.title);
        avatar = itemView.findViewById(R.id.avatar);

        title.setOnClickListener(this);
        avatar.setOnClickListener(this);
        itemView.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        //passing the clicked position to the parent class
        onItemClickListener.onItemClick(null, view, getAdapterPosition(), view.getId());
    }
}
}

适配器在其他类中的用法:

MyFragment.java

public class MyFragment extends Fragment implements AdapterView.OnItemClickListener {

private RecyclerView recycleview;
private MyAdapter adapter;

    .
    .
    .

private void init(Context context) {
    //passing this fragment as OnItemClickListener to the adapter
    adapter = new MyAdapter(context, this, items);
    recycleview.setAdapter(adapter);
}

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    //you can get the clicked item from the adapter using its position
    MyObject item = adapter.getItem(position);

    //you can also find out which view was clicked
    switch (view.getId()) {
        case R.id.title:
            //title view was clicked
            break;
        case R.id.avatar:
            //avatar view was clicked
            break;
        default:
            //the whole row was clicked
    }
}

}

Answer 6

伙计们在您的主要活动中使用此代码.非常有效的方法

RecyclerView recyclerView = (RecyclerView) findViewById(R.id.users_list);            
UsersAdapter adapter = new UsersAdapter(users, this);
recyclerView.setAdapter(adapter);
adapter.setOnCardClickListner(this);

这是你的Adapter类.

public class UsersAdapter extends RecyclerView.Adapter<UsersAdapter.UserViewHolder> {
        private ArrayList<User> mDataSet;
        OnCardClickListner onCardClickListner;


        public UsersAdapter(ArrayList<User> mDataSet) {
            this.mDataSet = mDataSet;
        }

        @Override
        public UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.user_row_layout, parent, false);
            UserViewHolder userViewHolder = new UserViewHolder(v);
            return userViewHolder;
        }

        @Override
        public void onBindViewHolder(UserViewHolder holder, final int position) {
            holder.name_entry.setText(mDataSet.get(position).getUser_name());
            holder.cardView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onCardClickListner.OnCardClicked(v, position);
                }
            });
        }

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

        @Override
        public void onAttachedToRecyclerView(RecyclerView recyclerView) {
            super.onAttachedToRecyclerView(recyclerView);
        }


        public static class UserViewHolder extends RecyclerView.ViewHolder {
            CardView cardView;
            TextView name_entry;

            public UserViewHolder(View itemView) {
                super(itemView);
                cardView = (CardView) itemView.findViewById(R.id.user_layout);
                name_entry = (TextView) itemView.findViewById(R.id.name_entry);
             }
        }

        public interface OnCardClickListner {
            void OnCardClicked(View view, int position);
        }

        public void setOnCardClickListner(OnCardClickListner onCardClickListner) {
            this.onCardClickListner = onCardClickListner;
        }
    }

在此之后,您将在活动中获得此覆盖方法.

@Override
    public void OnCardClicked(View view, int position) {
        Log.d("OnClick", "Card Position" + position);
    }

Answer 7

> RecyclerView与Listview有何不同？

一个区别是有一个LayoutManager使用RecyclerView的课程,您可以通过它管理您的喜欢RecyclerView-

水平或垂直滚动LinearLayoutManager

GridLayout by GridLayoutManager

交错的GridLayout by StaggeredGridLayoutManager

对于RecyclerView的水平滚动 -

LinearLayoutManager llm = new LinearLayoutManager(context);
llm.setOrientation(LinearLayoutManager.HORIZONTAL);
recyclerView.setLayoutManager(llm);

Answer 8

跟进MLProgrammer-CiM卓越的RxJava解决方案

消耗/观察点击次数

Consumer<String> mClickConsumer = new Consumer<String>() {
        @Override
        public void accept(@NonNull String element) throws Exception {
            Toast.makeText(getApplicationContext(), element +" was clicked", Toast.LENGTH_LONG).show();
        }
    };

ReactiveAdapter rxAdapter = new ReactiveAdapter();
rxAdapter.getPositionClicks().subscribe(mClickConsumer);

RxJava 2. +

修改原始tl; dr为:

public Observable<String> getPositionClicks(){
    return onClickSubject;
}

PublishSubject#asObservable()去掉了.只需返回PublishSubject哪个是Observable.

Answer 9

如何把它们放在一起的例子......

• onClick()处理
• 光标 - RecyclerView

• ViewHolder类型

  public class OrderListCursorAdapter extends CursorRecyclerViewAdapter<OrderListCursorAdapter.ViewHolder> {
  
  private static final String TAG = OrderListCursorAdapter.class.getSimpleName();
  private static final int ID_VIEW_HOLDER_ACTUAL = 0;
  private static final int ID_VIEW_HOLDER = 1;
  
  public OrderListCursorAdapter(Context context, Cursor cursor) {
      super(context, cursor);
  }
  
  public static class ViewHolderActual extends ViewHolder {
      private static final String TAG = ViewHolderActual.class.getSimpleName();
      protected IViewHolderClick listener;
      protected Button button;
  
      public ViewHolderActual(View v, IViewHolderClick listener) {
          super(v, listener);
          this.listener = listener;
          button = (Button) v.findViewById(R.id.orderList_item_button);
          button.setOnClickListener(this);
      }
  
      public void initFromData(OrderData data) {
          Log.d(TAG, "><initFromData(data=" + data + ")");
          orderId = data.getId();
          vAddressStart.setText(data.getAddressStart());
          vAddressEnd.setText(data.getAddressEnd());
      }
  
      @Override
      public void onClick(View view) {
          if (view instanceof Button) {
              listener.onButtonClick((Button) view, getPosition(), this);
          } else {
              super.onClick(view);
          }
      }
  
      public interface IViewHolderClick extends ViewHolder.IViewHolderClick {
          public void onButtonClick(Button button, int position, ViewHolder viewHolder);
      }
  }
  
  public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
      private static final String TAG = ViewHolder.class.getSimpleName();
      protected long orderId;
      protected IViewHolderClick listener;
      protected TextView vAddressStart;
      protected TextView vAddressEnd;
      protected TextView vStatus;
  
      public ViewHolder(View v, IViewHolderClick listener) {
          super(v);
          this.listener = listener;
          v.setOnClickListener(this);
  
          vAddressStart = (TextView) v.findViewById(R.id.addressStart);
          vAddressEnd = (TextView) v.findViewById(R.id.addressEnd);
          vStatus = (TextView) v.findViewById(R.id.status);
      }
  
      public void initFromData(OrderData data) {
          Log.d(TAG, "><initFromData(data=" + data + ")");
          orderId = data.getId();
          vAddressStart.setText(data.getAddressStart());
          vAddressEnd.setText(data.getAddressEnd());
      }
  
      public long getOrderId() {
          return orderId;
      }
  
      @Override
      public void onClick(View view) {
          listener.onCardClick(view, getPosition(), this);
      }
  
      public interface IViewHolderClick {
          public void onCardClick(View view, int position, ViewHolder viewHolder);
      }
  }
  
  @Override
  public int getItemViewType(int position) {
      return position == 0 ? ID_VIEW_HOLDER_ACTUAL : ID_VIEW_HOLDER;
  }
  
  @Override
  public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
      Log.d(TAG, ">>onCreateViewHolder(parent=" + parent + ", viewType=" + viewType + ")");
  
      ViewHolder result;
  
      switch (viewType) {
          case ID_VIEW_HOLDER_ACTUAL: {
              View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout_actual, parent, false);
              result = new ViewHolderActual(itemView, new ViewHolderActual.IViewHolderClick() {
                  @Override
                  public void onCardClick(View view, int position, ViewHolder viewHolder) {
                      Log.d(TAG, "><onCardClick(view=" + view + ", position=" + position + ", viewHolder=" + viewHolder + ")");
                      Intent intent = new Intent(view.getContext(), OrderDetailActivity.class);
                      intent.putExtra(OrderDetailActivity.ARG_ORDER_ID, viewHolder.getOrderId());
                      view.getContext().startActivity(intent);
                  }
  
                  @Override
                  public void onButtonClick(Button button, int position, ViewHolder viewHolder) {
                      Log.d(TAG, "><onButtonClick(button=" + button + ", position=" + position + ", viewHolder=" + viewHolder + ")");
                      Intent intent = new Intent(button.getContext(), OrderMapActivity.class);
                      intent.putExtra(OrderMapActivity.ARG_ORDER_ID, viewHolder.getOrderId());
                      button.getContext().startActivity(intent);
                  }
              });
              break;
          }
          case ID_VIEW_HOLDER:
          default: {
              View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout, parent, false);
              result = new ViewHolder(itemView, new ViewHolder.IViewHolderClick() {
                  @Override
                  public void onCardClick(View view, int position, ViewHolder viewHolder) {
                      Log.d(TAG, "><onCardClick(view=" + view + ", position=" + position + ", viewHolder=" + viewHolder + ")");
                      Intent intent = new Intent(view.getContext(), OrderDetailActivity.class);
                      intent.putExtra(OrderDetailActivity.ARG_ORDER_ID, viewHolder.getOrderId());
                      view.getContext().startActivity(intent);
                  }
              });
              break;
          }
      }
  
      Log.d(TAG, "<<onCreateViewHolder(parent=" + parent + ", viewType=" + viewType + ")= " + result);
      return result;
  }
  
  @Override
  public void onBindViewHolder(ViewHolder viewHolder, Cursor cursor) {
      Log.d(TAG, "><onBindViewHolder(viewHolder=" + viewHolder + ", cursor=" + cursor + ")");
      final OrderData orderData = new OrderData(cursor);
      viewHolder.initFromData(orderData);
  }
  }
  

Answer 10

据我所知,MLProgrammer-CiM 答案,只需要这样做:

class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
    private ImageView image;
    private TextView title;
    private TextView price;

    public MyViewHolder(View itemView) {
        super(itemView);
        image = (ImageView)itemView.findViewById(R.id.horizontal_list_image);
        title = (TextView)itemView.findViewById(R.id.horizontal_list_title);
        price = (TextView)itemView.findViewById(R.id.horizontal_list_price);
        image.setOnClickListener(this);
        title.setOnClickListener(this);
        price.setOnClickListener(this);
    }


    @Override
    public void onClick(View v) {
        Toast.makeText(context, "Item click nr: "+getLayoutPosition(), Toast.LENGTH_SHORT).show();
    }
}

Answer 11

阅读@ MLProgrammer-CiM的回答后,这是我的代码:

class NormalViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

    @Bind(R.id.card_item_normal)
    CardView cardView;

    public NormalViewHolder(View itemView) {
        super(itemView);
        ButterKnife.bind(this, itemView);
        cardView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if(v instanceof CardView) {
            // use getAdapterPosition() instead of getLayoutPosition()
            int itemPosition = getAdapterPosition();
            removeItem(itemPosition);
        }
    }
}

Answer 12

我这样做了,非常简单:

只需为Clicked RecyclerView位置添加1行:

int position = getLayoutPosition()

ViewHolder类的完整代码:

private class ChildViewHolder extends RecyclerView.ViewHolder {
        public ImageView imageView;
        public TextView txtView;

        public ChildViewHolder(View itemView) {
            super(itemView);
            imageView= (ImageView)itemView.findViewById(R.id.imageView);
            txtView= (TextView) itemView.findViewById(R.id.txtView);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Log.i("RecyclerView Item Click Position", String.valueOf(getLayoutPosition()));
                }
            });
        }
    }

希望这会帮助你.

Answer 13

我使用这个方法从RecyclerView启动一个Intent:

@Override
 public void onBindViewHolder(ViewHolder viewHolder, int i) {

    final MyClass myClass = mList.get(i);
    viewHolder.txtViewTitle.setText(myclass.name);
   ...
    viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
      @Override
       public void onClick(View v){
             Intent detailIntent = new Intent(mContext, type.class);                                                            
             detailIntent.putExtra("MyClass", myclass);
             mContext.startActivity(detailIntent);
       }
}
);

Answer 14

请参阅我的方法：

首先声明一个这样的接口：

/**
 * Interface used for delegating item click events in a {@link android.support.v7.widget.RecyclerView}
 * Created by Alex on 11/28/2015.
 */
  public interface OnRecyclerItemClickListener<T> {

     /**
      * Called when a click occurred inside a recyclerView item view
      * @param view that was clicked
      * @param position of the clicked view
      * @param item the concrete data that is displayed through the clicked view
      */
      void onItemClick(View view, int position, T item);
   }

然后创建适配器：

public class CustomRecyclerAdapter extends RecyclerView.Adapter {      

    private class InternalClickListener implements View.OnClickListener{

      @Override
      public void onClick(View v) {
        if(mRecyclerView != null && mItemClickListener != null){
            // find the position of the item that was clicked
            int position = mRecyclerView.getChildAdapterPosition(v);
            Data data = getItem(position);
            // notify the main listener
            mItemClickListener.onItemClick(v, position, data);
        }
    }
}

private final OnRecyclerItemClickListener mItemClickListener;
private RecyclerView mRecyclerView;    
private InternalClickListener mInternalClickListener;


/**
 *
 * @param itemClickListener used to trigger an item click event
 */
public PlayerListRecyclerAdapter(OnRecyclerItemClickListener itemClickListener){        
    mItemClickListener = itemClickListener;
    mInternalClickListener = new InternalClickListener();
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
   View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, parent, false);

    v.setOnClickListener(mInternalClickListener);

    ViewHolder viewHolder = new ViewHolder(v);
    return viewHolder;
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    // do your binding here
}

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

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);

    mRecyclerView = recyclerView;
}

@Override
public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
    super.onDetachedFromRecyclerView(recyclerView);

    mRecyclerView = null;
}

public Data getItem(int position){
    return mDataset.get(position);
}
}

现在让我们看看如何从片段中集成它：

public class TestFragment extends Fragment implements OnRecyclerItemClickListener<Data>{
   private RecyclerView mRecyclerView;

   @Override
   public void onItemClick(View view, int position, Data item) {
     // do something
   }

   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      return inflater.inflate(R.layout.test_fragment, container, false);
   }

   @Override
   public void onViewCreated(View view, Bundle savedInstanceState) {
      mRecyclerView = view.findViewById(idOfTheRecycler);
      mRecyclerView .setAdapter(new CustomRecyclerAdapter(this));
   }

Answer 15

如果你想将 onClick() 添加到 item 的子视图中，例如 item 中的一个按钮，我发现你可以在你自己的 RecyclerView.Adapter 的 onCreateViewHolder() 中轻松完成，就像这样：

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View v = LayoutInflater
                    .from(parent.getContext())
                    .inflate(R.layout.cell, null);

            Button btn = (Button) v.findViewById(R.id.btn);
            btn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //do it
                }
            });

            return new MyViewHolder(v);
        }

我不知道这是否是一个好方法，但它运作良好。如果有人有更好的主意，很高兴告诉我并纠正我的答案！:)

Answer 16

如果您有一个POJO列表并希望从适配器外部单击检索一个POJO,则可以非常轻松地实现它.

在适配器中,为click事件创建一个侦听器,并设置一个方法来设置它:

public class MyAdapter extends RecyclerView.Adapter<SitesListAdapter.ViewHolder> {
...
private List<MyPojo> mMyPojos;
private static OnItemClickListener mOnItemClickListener;

...
public interface OnItemClickListener {
    public void onItemClick(MyPojo pojo);
}

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

}

在ViewHolder中,实现onClickListener并创建一个类成员来临时存储视图所呈现的POJO(这是一个例子,创建一个setter会更好):

public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    public MyPojo mCurrentPojo;
    ...
    public ViewHolder(View view) {
        super(v);
        ...
        view.setOnClickListener(this); //You could set this on part of the layout too
    }

    ...
    @Override
    public void onClick(View view) {
        if(mOnItemClickListener != null && mCurrentPojo != null){
            mOnItemClickListener.onItemClick(mCurrentPojo);
        }
    }

返回适配器,在绑定ViewHolder时设置当前POJO(如果当前视图没有,则设置为null):

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
    final MyPojo currentPojo = mMyPojos.get(position); 
    holder.mCurrentPojo = currentPojo;
    ...

就是这样,现在你可以从你的片段/活动中使用它:

    mMyAdapter.setOnItemClickListener(new mMyAdapter.OnItemClickListener() {
        @Override
        public void onItemClick(MyPojo pojo) {
            //Do whatever you want with your pojo here
        }
    });

Answer 17

RecyclerView没有onItemClickListener原因，因为RecyclerView负责回收视图（惊奇！），因此回收视图以处理接收到的点击事件是视图的责任。

实际上，这使它使用起来更加容易，尤其是当您具有可以在多个位置单击的项目时。

无论如何，检测RecyclerView项目上的点击非常容易。您需要做的就是定义一个接口（如果您不使用Kotlin，在这种情况下，您只需传入一个lambda）：

public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {
    private final Clicks clicks;

    public MyAdapter(Clicks clicks) {
        this.clicks = clicks;
    }

    private List<MyObject> items = Collections.emptyList();

    public void updateData(List<MyObject> items) {
        this.items = items;
        notifyDataSetChanged(); // TODO: use ListAdapter for diffing instead if you need animations
    }

    public interface Clicks {
        void onItemSelected(MyObject myObject, int position);
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        private MyObject myObject;    

        public MyViewHolder(View view) {
            super(view);
            // bind views
            view.setOnClickListener((v) -> {
                int adapterPosition = getAdapterPosition();
                if(adapterPosition >= 0) {
                    clicks.onItemSelected(myObject, adapterPosition);
                }
            });
        }

        public void bind(MyObject myObject) {
            this.myObject = myObject;
            // bind data to views
        }
    }
}

Kotlin中的相同代码：

class MyAdapter(val itemClicks: (MyObject, Int) -> Unit): RecyclerView.Adapter<MyViewHolder>() {
    private var items: List<MyObject> = Collections.emptyList()

    fun updateData(items: List<MyObject>) {
        this.items = items
        notifyDataSetChanged() // TODO: use ListAdapter for diffing instead if you need animations
    }

    inner class MyViewHolder(val myView: View): RecyclerView.ViewHolder(myView) {
        private lateinit var myObject: MyObject

        init {
            // binds views
            myView.onClick {
                val adapterPosition = getAdapterPosition()
                if(adapterPosition >= 0) {
                    itemClicks.invoke(myObject, adapterPosition)
                }
            }
        }

        fun bind(myObject: MyObject) {
            this.myObject = myObject
            // bind data to views
        }
    }
}