RecyclerView没有显示任何内容 [英] RecyclerView is not showing anything

问题描述

在我的应用程序中，我正在从sqlite数据库中获取数据，并使用RecyclerView显示它们. 这是我的适配器:-

In my application I am getting data from sqlite database and showing them using RecyclerView. This is my adapter :-

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.Holder> {

private List<SentData> dataList = Collections.emptyList();
private LayoutInflater inflater;

public RecyclerViewAdapter(Context context, List<SentData> dataList) {
    Log.d("array size", dataList.size()+"");
    this.dataList = dataList;
    inflater = LayoutInflater.from(context);
}

@Override
public RecyclerViewAdapter.Holder onCreateViewHolder(ViewGroup viewGroup, int i) {

    View view =  LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.custom_list_row, viewGroup, false);
    return new Holder(view);
}

@Override
public void onBindViewHolder(RecyclerViewAdapter.Holder viewHolder, int position) {
    SentData current = dataList.get(position);

    Log.d("Required data is", current.circleName + current.retailName);
    viewHolder.circleName.setText(current.circleName);
    viewHolder.retailName.setText(current.retailName);
    viewHolder.retailAddress.setText(current.retailAddress);
    viewHolder.captureOn.setText(current.captureDate);
}

@Override
public int getItemCount() {
    return 0;
}


class Holder extends RecyclerView.ViewHolder {

    private TextView retailName, retailAddress, circleName, captureOn;

    public Holder(View itemView) {
        super(itemView);
        retailName = (TextView) itemView.findViewById(R.id.tvRetailerName);
        retailAddress = (TextView) itemView.findViewById(R.id.tvRetailAddress);
        circleName = (TextView) itemView.findViewById(R.id.tvCircleName);
        captureOn = (TextView) itemView.findViewById(R.id.tvCaptureOn);
    }
}

}

SentData是一个类

SentData is a class

public class SentData {
String circleName, retailName, retailAddress, captureDate, syncId, detailId;
}

我没有收到任何错误，但列表未显示.我正在尝试与调试器进行检查，发现onBindViewHolder()方法未运行.

I am not getting any error but the list is not showing. I am trying check with debugger, I found that the onBindViewHolder() method is not running.

在RecyclerViewAdapter构造函数中，我得到的dataList大小为2，这意味着已成功从sqlite数据库检索数据.

In the RecyclerViewAdapter constructor I got the dataList size is 2 that means data is successfully retrieved from sqlite database.

现在我无法找出问题所在，为什么它不起作用，请帮助我. 在此先感谢:)

Now I cant find out what is the problem and why its not working please help me. Thanks in advance :)

推荐答案

Collections.emptyList()返回空的不可变列表，您应该使用 new ArrayList< ;>().
然后，从列表中添加/删除数据后，必须调用 notifyDataSetChanged()才能看到更改.
同样， getItemCount()应该返回 dataList.size()

Collections.emptyList() returns an empty immutable list, you should use new ArrayList<>() instead.
Then after you add/remove data from the list must call notifyDataSetChanged() for the changes to be seen.
Also getItemCount() should return dataList.size()

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