[英]Empty RecyclerView from JSON Data
谢谢到目前为止的所有帮助。 我这是一个奇怪的问题。 我正在发出网络请求以从服务器获取数据,并使用json字符串更新UI。 我已经正确完成了json解析,并将结果打印在日志猫中,如下所示:
11-17 22:57:02.143 25111-25111/com.billionusers.tingting D/MyReviewsFragment: FAN Lib My Reviews Response is: {"success":true,"reviews":[{"_id":"5a0ef724b004b53e48eafaf6","updatedAt":"2017-11-17T14:50:12.700Z","createdAt":"2017-11-17T14:50:12.700Z","for":"5a0d90b8f690f625df370bb6","by":"5a0aa8f7aecfbc47838fb89b","body":"Lorem Ipsum","__v":0}]}
我使用了一个模型类来保存评论,并通过recyclerview过程创建了适配器。 我的模型类包含来自服务器的审阅数据的名称,图像,时间和正文。
这是我的适配器代码:
public class ReviewsAdapter extends RecyclerView.Adapter<MyReviewsHolder> {
private final Context context;
private List<Reviews> itemsList;
public ReviewsAdapter(Context context, List<Reviews> itemsList) {
this.context = context;
this.itemsList = itemsList;
}
@Override
public MyReviewsHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.my_reviews_item_layout, parent, false);
return new MyReviewsHolder(view);
}
@Override
public void onBindViewHolder(MyReviewsHolder viewholder, int position) {
Reviews reviews = itemsList.get(position);
Picasso.with(context)
.load(reviews.getReviewerImg())
.into(viewholder.reviewerProfileImg);
viewholder.reviewerNameTV.setText(reviews.getReviewerName());
viewholder.reviewTimeTV.setText(reviews.getReviewTime());
viewholder.reviewBodyTV.setText(reviews.getReviewBody());
}
@Override
public int getItemCount() {
if (itemsList == null) {
return 0;
}
return itemsList.size();
}
}
在我的片段中,我已经初始化了如下视图和字段:
private TextView dummy;
private RecyclerView my_reviews_recyclerView;
private List<Reviews> itemsList = new ArrayList<>();
private ReviewsAdapter adapter;
private boolean success;
public MyReviewsFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_my_reviews, container, false);
dummy = view.findViewById(R.id.dummy);
my_reviews_recyclerView = view.findViewById(R.id.my_reviews_recyclerView);
my_reviews_recyclerView.setHasFixedSize(true);
my_reviews_recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
fetchMyReviews();
return view;
}
发出网络请求的代码。 我也在这里完成了json解析,并尝试使用数据更新UI,但是recyclerview显示为空状态。
这是网络和UI代码:
AndroidNetworking.get(Constants.GET_MY_REVIEWS_ENDPOINT)
.addHeaders("x-access-token", token)
.setTag("Get My Reviews")
.setPriority(Priority.HIGH)
.build()
.getAsJSONObject(new JSONObjectRequestListener() {
@Override
public void onResponse(JSONObject response) {
Log.d(TAG, "FAN Lib My Reviews Response is: \t" + response.toString());
try {
JSONObject object = response.getJSONObject("");
success = (boolean) object.get("success");
JSONArray reviewsArray = object.getJSONArray("reviews");
for (int i = 0; i < reviewsArray.length(); i++){
JSONObject body = reviewsArray.getJSONObject(i);
String revId = body.getString("_id");
String revTime = body.getString("createdAt");
String revFor = body.getString("for");
String revBy = body.getString("by");
String revMsgBody = body.getString("body");
// TODO: 11/17/2017 Get Reviewer Details
//Reviews reviews = new Reviews("", "Demo User", revMsgBody, revTime);
Reviews reviews = new Reviews();
reviews.setReviewerName("Abhiram Labhani");
reviews.setReviewerImg("");
reviews.setReviewBody(revMsgBody);
reviews.setReviewTime(revTime);
itemsList.add(reviews);
adapter = new ReviewsAdapter(getActivity(), itemsList);
my_reviews_recyclerView.setAdapter(adapter);
if (adapter.getItemCount() > 0){
dummy.setVisibility(View.GONE);
Log.d(TAG, "Adapter size is:\t" + adapter.getItemCount());
} else {
dummy.setVisibility(View.VISIBLE);
Log.d(TAG, "Adapter size is:\t" + adapter.getItemCount());
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onError(ANError anError) {
}
});
有人可以指出我所缺少的,因为我不知道问题出在哪里。 谢谢。
尝试先排除故障,
这是错误:
JSONObject object = response.getJSONObject("");
success = (boolean) object.get("success");
JSONArray reviewsArray = object.getJSONArray("reviews");
为什么从响应中使用空的jsonobject? 直接使用它:
success = (boolean) response.get("success");
JSONArray reviewsArray = response.getJSONArray("reviews");
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