如何单击活动中的recyclerview项目

Question

我已经使用recyclerview创建了图像的水平列表视图，当我单击特定图像时，我想用我的活动的图像更改背景图像，但是我正在面对问题，我如何设置InItem单击我的主动脉中的回收瓶项目？

Answer 1

可能会帮助您，但我确实喜欢我的代码：

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实施：

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){}
}

Answer 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) {
        }
    }

使用以下内容

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

Answer 3

您可以将适配器从此适配器延伸：

/**
 * 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));
        }
    }

并这样使用：

MyAdapter adapter = new MyAdapter();
adapter.setOnItemClickListener(this::itemClicked);
private void itemClicked(RecyclerView recyclerView, View view, int position) {
   //Handle item click here
}