如何点击Activity中的recyclerview项目？ [复制]

Posted 2023-04-13

【中文标题】如何点击Activity中的recyclerview项目？ [复制]

【英文标题】：How to click recyclerview items in Activity? [duplicate]

【发布时间】：2018-07-16 12:03:42

【问题描述】：

我使用 recyclerview 创建了图像的水平列表视图，当我单击特定图像时，我想用我的活动图像更改背景图像，但我遇到了问题，我如何设置 onItem click对于我的 mainactivity 中的 recyclerview 项目？

【参考方案1】：

也许它会对你有所帮助，但我确实在我的代码中这样做了：

RecyclerView recyclerView = findViewById(R.id.recycler);
recyclerView.addOnItemTouchListener(
    new RecyclerItemClickListener(context, recyclerView ,new RecyclerItemClickListener.OnItemClickListener() 
      @Override public void onItemClick(View view, int position) 
        // do whatever
      

      @Override public void onLongItemClick(View view, int position) 
        // do whatever
      
    )
);

RecyclerItemClickListener 实现：

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)

【参考方案2】：

   public class MyRecycleViewClickListener implements RecyclerView.OnItemTouchListener 
        private OnItemClickListener mListener;

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

        GestureDetector mGestureDetector;

        public MyRecycleViewClickListener(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) 

        
    

如下使用

mRecyclerView.addOnItemTouchListener(new MyRecycleViewClickListener(this, new MyRecycleViewClickListener.OnItemClickListener() 
    @Override
    public void onItemClick(View view, int position) 

    
));

【讨论】：

谢谢朋友，解决了我的问题

【参考方案3】：

您可以让您的适配器从此适配器扩展：

/**
 * Enables subclasses to add itself as an OnClickListener when binding. This enables the registered
 * listener of type @link OnItemClickListener to receive an onItemClick callback.
 */
public abstract class ItemClickRecyclerViewAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH>
    implements View.OnClickListener 

    /**
     * A similar interface to that of ListView lore.
     */
    public interface OnItemClickListener 
        void onItemClick(RecyclerView recyclerView, View view, int position);
    

    protected WeakReference<RecyclerView> mAttachedRecyclerViewReference;

    protected OnItemClickListener mOnItemClickListener;

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) 
        super.onAttachedToRecyclerView(recyclerView);
        mAttachedRecyclerViewReference = new WeakReference<>(recyclerView);
    

    @Override
    public void onDetachedFromRecyclerView(RecyclerView recyclerView) 
        super.onDetachedFromRecyclerView(recyclerView);
        mAttachedRecyclerViewReference = null;
    

    @CallSuper
    @Override
    public void onBindViewHolder(VH holder, int position) 
        holder.itemView.setOnClickListener(this);
    

    @CallSuper
    @Override
    public void onViewRecycled(VH holder) 
        holder.itemView.setOnClickListener(null);
    

    /**
     * Provides access to the currently attached recycler view.
     */
    public RecyclerView getAttachedRecyclerView() 
        return mAttachedRecyclerViewReference.get();
    

    /**
     * Get the registered item click listener.
     */
    public OnItemClickListener getOnItemClickListener() 
        return mOnItemClickListener;
    

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) 
        mOnItemClickListener = onItemClickListener;
    

    @Override
    public void onClick(View v) 
        if (mAttachedRecyclerViewReference != null && mAttachedRecyclerViewReference.get() != null && mOnItemClickListener != null) 
            mOnItemClickListener.onItemClick(mAttachedRecyclerViewReference.get(), v, mAttachedRecyclerViewReference.get().getChildAdapterPosition(v));
        
    

并像这样使用它：

MyAdapter adapter = new MyAdapter();
adapter.setOnItemClickListener(this::itemClicked);

private void itemClicked(RecyclerView recyclerView, View view, int position) 
   //Handle item click here