Question

我是Android的新手，我有一个问题。我有一个recyclerview，可以单击它并发送查询。单击后，它将获得被单击的每个位置的编号/ ID，

像这样：

pip install -U jupyter notebook
pip install -U vega
jupyter nbextension install --sys-prefix --py vega

第一次单击成功，但是第二次或第三次单击都会出错。我认为这是因为变量fno和codeCity已被填充。那么如何删除变量上的值？

当recyclerview单击时，这是我的代码：

fno = arrivals.get(position).flightno;
codeCity = arrivals.get(position).arr;

这是查询

mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
            GestureDetector gestureDetector = new GestureDetector(mContext, new GestureDetector.SimpleOnGestureListener() {

                public boolean onSingleTapUp(MotionEvent e){
                    return true;
                }
            });

            @Override
            public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
                View child = rv.findChildViewUnder(e.getX(), e.getY());
                if (child != null && gestureDetector.onTouchEvent(e)){
                    int position = rv.getChildAdapterPosition(child);

                    fno = arrivals.get(position).flightno;
                    codeCity = arrivals.get(position).arr;

                    final Bundle i = new Bundle();
                    i.putString("city", codeCity.toString()); // Key1
                    i.putString("flightno", fno.toString()); // Key1
                    open2(i);
                }
                return false;
            }

            @Override
            public void onTouchEvent(RecyclerView rv, MotionEvent e) {

            }

            @Override
            public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

            }
        });

谢谢！

Answer 1

有两种方法可以捕获recyclerview项上的click事件：

第一种方法

替代onClick而不是onInterceptTouchEvent方法。

我正在为您提供示例。

mRecyclerView.addOnItemTouchListener(new RecyclerTouchListener(this,
        recyclerView, new ClickListener() {
    @Override
    public void onClick(View view, final int position) {
        fno = arrivals.get(position).flightno;
        codeCity = arrivals.get(position).arr;
    }

}));

class RecyclerTouchListener implements RecyclerView.OnItemTouchListener{

    private ClickListener clicklistener;
    private GestureDetector gestureDetector;

    public RecyclerTouchListener(Context context, final RecyclerView recycleView, final ClickListener clicklistener){

        this.clicklistener=clicklistener;
        gestureDetector=new GestureDetector(context,new GestureDetector.SimpleOnGestureListener(){
            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                return true;
            }

            @Override
            public void onLongPress(MotionEvent e) {
                View child=recycleView.findChildViewUnder(e.getX(),e.getY());
                if(child!=null && clicklistener!=null){
                    clicklistener.onLongClick(child,recycleView.getChildAdapterPosition(child));
                }
            }
        });
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        View child=rv.findChildViewUnder(e.getX(),e.getY());
        if(child!=null && clicklistener!=null && gestureDetector.onTouchEvent(e)){
            clicklistener.onClick(child,rv.getChildAdapterPosition(child));
        }

        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {

    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }
}

第二种方法（一种较为传统的方法）

覆盖适配器视口的OnClickListener：

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

    LayoutInflater inflater;
    Context context;

    private MyAdapter.RecyclerViewClickListener mListener;

    public MyAdapter(Context context, RecyclerViewClickListener mListener) {
        this.context = context;
        this.mListener = mListener;
        inflater = LayoutInflater.from(this.context);

    }

    public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        public MyViewHolder(View item, RecyclerViewClickListener listener) {
            super(item);
            mListener = listener;
            item.setOnClickListener(this);
        }


        @Override
        public void onClick(View view) {
            mListener.onClick(view, getAdapterPosition());
        }
    }

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

        return new MyViewHolder(itemView,mListener);
    }
    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {

    }


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

    @Override
    public int getItemViewType(int position) {
        return position;
    }


    @Override
    public long getItemId(int position) {
        return 0;
    }


    public interface RecyclerViewClickListener {
        void onClick(View view, int position);
    }
}

以及您的片段/活动中：

myadapter = new MyAdapter(getContext(), new MyAdapter.RecyclerViewClickListener() {
            @Override
            public void onClick(View view, int position) {
                fno = arrivals.get(position).flightno;
                codeCity = arrivals.get(position).arr;
            }
        });
        recyclerView.setAdapter(MyAdapter);
        MyAdapter.notifyDataSetChanged();

希望这对您有所帮助。

如何删除变量值

1 个答案: