Android：如何更新“回收者”视图列表中的单行

比尼尔·苏伦德兰（Binil Surendran）

我有一个应用程序调用API，该API会在创建约500行时生成它。在我的应用程序中，行内容可以在详细信息页面中更新。因此，在更新之后，无需再次调用API，就有可能更新Recycler View中的行。

活动

AsyncHttpClient client = new AsyncHttpClient();
client.get("URL", new AsyncHttpResponseHandler() {
@Override
 public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
try {                        
    String jsonStr = new String(responseBody, "UTF-8");
    if (jsonStr != null) {
    try {  
        JSONArray jsonArray = new JSONArray(jsonStr);
        JSONObject cStatus = jsonArray.getJSONObject(jsonArray.length()-1);
        for (int i = 0; i < jsonArray.length(); i++) 
        {
        JSONObject c = jsonArray.getJSONObject(i);
        String firstName = c.getString("firstName");
        String subDistributerId = c.getString("subDistributerId");
        SubdistributorItem item = new SubdistributorItem();
        item.setSubDistributorName(firstName);
        item.setSubDistributorId(subDistributerId);
        ubdistributorItemList.add(item);
        }
       } catch (JSONException e) {
         e.printStackTrace();
       }
     } 
     Collections.sort(subdistributorItemList, new Comparator<SubdistributorItem>() {
     public int compare(SubdistributorItem o1, SubdistributorItem o2) {
     return o1.getSubDistributorName().compareToIgnoreCase(o2.getSubDistributorName());
    }
   });
    adapter = new SubdistributorRecyclerAdapter(getActivity(),subdistributorItemList);
     mRecyclerView.setAdapter(adapter);
  } catch (UnsupportedEncodingException e) {
   e.printStackTrace();
   }
  }               
});

转接器类别

public class SubdistributorRecyclerAdapter extends RecyclerView.Adapter<SubdistributorListRowHolder>  {
private List<SubdistributorItem> subdistributorItems;
private Context mContext;
private ArrayList<SubdistributorItem> arraylist;

public SubdistributorRecyclerAdapter(Context context, List<SubdistributorItem> subdistributorItems) {
    this.subdistributorItems = subdistributorItems;
    this.mContext = context;
    this.arraylist = new ArrayList<SubdistributorItem>();
    this.arraylist.addAll(subdistributorItems);
}

@Override
public SubdistributorListRowHolder onCreateViewHolder(ViewGroup viewGroup,  int i) {
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.subdistributor_list_item, null);
    SubdistributorListRowHolder mh = new SubdistributorListRowHolder(v);

    layout_subdistributor.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(final View v) {
      Intent i = new Intent(mContext, SubdistributorDetail.class);
                    Log.e("Tag shop ", "ShopKeeper Detail called");
                    i.putExtra("subDistributorStatus", txt_RechargeSubdistributor.getText().toString());
                    i.putExtra("subDistributorId", txt_subDistributorId.getText().toString());
                    mContext.startActivity(i);

        }
    });
    return mh;
}
@Override
public void onBindViewHolder(SubdistributorListRowHolder subDistributorListRowHolder, int i) {

    SubdistributorItem subdistributorItem = subdistributorItems.get(i);
    Log.e("Tag ", "adapter "+ subdistributorItem.getSubDistributorName());

}
@Override
public int getItemCount() {
    return (null != subdistributorItems ? subdistributorItems.size() : 0);
}
}

因此，任何人都可以帮助我更新列表中的一行，而无需再次调用该API。

安德烈·扎伊特切夫

更新列表中的项目subdistributorItems。然后致电adapter.notifyItemChanged(int position)。您可以使用以下方法在ClickListener中获得排名：

layout_subdistributor.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(final View v) {
        if (mh.getAdapterPosition() != RecyclerView.NO_POSITION) {
          int position = mh.getAdapterPosition();
          // edit your object by calling subdistributorItems.get(position)
        }
    }
});

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