在ViewHolder中添加item点击事件接口（自定义

Posted 2020-10-05 Calo-missile

在Adapter中定义接口并提供回调
static class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder> {
    
    private List<String> mList;
    private Context mContext;
    private OnItemClickListener mOnItemClickListener;

    public HomeAdapter(List<String> list, Context context) {
        mList = list;
        mContext = context;
    }
    //在里面实现具体的点击响应事件，同时传入两个参数：view和postion
    public interface OnItemClickListener{
        void onItemClick(View view, int position);

        void onItemLongClick(View view, int position);
    }

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

    public void removeData(int position) {
        mList.remove(position);
        notifyDataSetChanged();
    }

    
    @Override
    public HomeAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        MyViewHolder holder = new MyViewHolder(LayoutInflater.from(mContext).inflate(R.layout.myrecy_item,
                parent, false));
        return holder;
    }

    //对item控件进行点击事件的监听并回调给自定义的监听
    @Override
    public void onBindViewHolder(final HomeAdapter.MyViewHolder holder, int position) {
        holder.mTextView.setText(mList.get(position));
        if (mOnItemClickListener != null) {
            holder.mTextView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int pos = holder.getLayoutPosition();//当前Item列数
                    mOnItemClickListener.onItemClick(holder.mTextView, pos);
                }
            });
            holder.mTextView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View view) {
                    int pos = holder.getLayoutPosition();
                    mOnItemClickListener.onItemLongClick(holder.mTextView, pos);
                    return false;
                }
                
            });
        }
    }

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

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView mTextView;
        public MyViewHolder(View itemView) {
            super(itemView);
            mTextView = itemView.findViewById(R.id.tv_item);
        }
    }
}

在Main中的使用：

private void setLister() {//事件监听
    mAdapter.setOnItemClickListener(new HomeAdapter.OnItemClickListener() {
        @Override
        public void onItemClick(View view, int position) {
            Toast.makeText(MyRecyclerActivity.this, "点击了第" + (position + 1) + "条", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onItemLongClick(View view, final int position) {
            new AlertDialog.Builder(MyRecyclerActivity.this)
                    .setTitle("确定要删除吗？")
                    .setNegativeButton("取消", null)
                    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            mAdapter.removeData(position);
                        }
                    }).show();
        }
    });
}