从RecyclerView中的项获取位置数据

Question

private SDKP mSelectedPackage;
RecyclerView mRecyclerView;

mRecyclerView.addOnItemTouchListener(new RecyclerItemClickListener(this, new RecyclerItemClickListener.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
            //I'm STUCK HERE!
             mSelectedPackage = (SDKPackage) mRecyclerView.getItemAtPosition(position);
                    openContextMenu(view);

  /*Toast.makeText(MainActivity.this, "Card at " + position + " is clicked", Toast.LENGTH_SHORT).show();*/
            }
        }));


@Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)
    {
        mSelectedPackage.inflateMenu(menu);
        super.onCreateContextMenu(menu, v, menuInfo);
    } 

    @Override
    public boolean onContextItemSelected(MenuItem item)
    {
        return mSelectedPackage.onMenuClick(this, item);
    }

public void inflateMenu(ContextMenu menu)
    {
        menu.setHeaderTitle(getPackageName());
        if (isDownloading())
        {
            menu.add(Menu.NONE, 256, Menu.NONE, "Cancel download");
        }
        else if (isInstalled())
        {
            menu.add(Menu.NONE, 257, Menu.NONE, "Uninstall");
        }
        else
        {
            int i = 0;
            for (SDKA archive : archives)
            {
                menu.add(Menu.NONE, i++, Menu.NONE, archive.getArchiveName());
            }
        }
    }

    public boolean onMenuClick(Activity parent, MenuItem item)
    {
        if (item.getItemId() >= 256)
            uninstall();
        else
        {
            SDKA archive = archives.get(item.getItemId());
            if (archive != null)
            {
                archive.onClick(parent);
            }
        }
        return true;
    }

当我使用ListView时-

mListView.setOnItemClickListener(new AdapterView.OnItemClickListener()
            {
                @Override
                public void onItemClick(AdapterView<?> adapter, View view, int position, long arg)
                {
                    mSelectedPackage = (SDKP) mPackageList.getItemAtPosition(position);
                    openContextMenu(view);
                }
            });

Answer 1

在RecyclerView中没有GetItematPosition()的等效项。要解决这个问题，您可以在适配器上创建一个接口，并在Viewholder上实现该接口，该接口将监听onclick()。

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

然后让viewholder实现该接口。

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

private OnItemClickListener mListener;

public MyViewHolder(View itemView) {
    super(itemView);
    itemView.setOnClickListener(this);

}

 public MyViewHolder(View itemView, OnItemClickListener listener) {
    this(itemView);
    mListener = listener;
}


@Override
public void onClick(View v) {
    if (mListener != null) {
        mListener.onItemClick(v, getPosition());
    }
}

-或者，您可以使用rxjava。