我有这个错误。我正在从 API 下载数据,我想在嵌套在名为 ListFragment
的 Fragment 中的 RecyclerView 中打印它。 。该 fragment 是我在 ViewPager
中使用的三个 fragment 之一。 ViewPager
工作正常。现在,我只想显示两个 TextView 。它们的布局名称为 single_data_layout
。 List<Feature> features
是我的DataResponse
。项目正常构建,没有问题,我在日志中收到“数据已成功下载”。当我在 Debug模式下运行应用程序时,我收到消息说我的 RecyclerView
未连接至适配器。有什么想法吗?
API客户端:
public interface ApiClient {
@GET("/query?format=geojson&starttime&minsig=700")
Call<DataResponse> getData();
}
ApiClientFactory:
public class ApiClientFactory {
public static final String baseURL = "https://earthquake.usgs.gov/fdsnws/event/1/";
public ApiClient createApiClient(){
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(baseURL)
.addConverterFactory(GsonConverterFactory.create())
.build();
return retrofit.create(ApiClient.class);
}
}
数据适配器:
public class DataAdapter extends RecyclerView.Adapter<DataAdapter.DataViewHolder> {
private List<Feature> features;
private ListFragment listFragment;
private Context context;
private LayoutInflater inflater;
public DataAdapter(List<Feature> features) {
this.features = features;
}
@Override
public DataViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
inflater = LayoutInflater.from(context);
View contractView = inflater.inflate(R.layout.single_data_layout, parent, false);
return new DataViewHolder(contractView);
}
@Override
public void onBindViewHolder(DataViewHolder holder, int position) {
holder.place.setText(features.get(position).getProperties().getPlace());
holder.alert.setText(features.get(position).getProperties().getAlert());
}
@Override
public int getItemCount() {
return features.size();
}
public static class DataViewHolder extends RecyclerView.ViewHolder {
private final TextView place;
private final TextView alert;
public DataViewHolder(View view) {
super(view);
place = (TextView) view.findViewById(R.id.place_text_view);
alert = (TextView) view.findViewById(R.id.alert_text_view);
}
}
}
列表 fragment :
public class ListFragment extends Fragment {
private RecyclerView recyclerView;
private static final String TAG = ListFragment.class.getSimpleName();
private ApiClient apiClient;
private List<Feature> features;
private RecyclerView.LayoutManager layoutManager;
private DataAdapter adapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_list, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
getData();
return view;
}
private void getData() {
apiClient = new ApiClientFactory().createApiClient();
apiClient.getData().enqueue(new Callback<DataResponse>() {
@Override
public void onResponse(Call<DataResponse> call, Response<DataResponse> response) {
if (response.isSuccessful()) {
features = response.body().getFeatures();
adapter = new DataAdapter(features);
layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(layoutManager);
}
Log.d(TAG, "Data successfully downloaded");
}
@Override
public void onFailure(Call<DataResponse> call, Throwable t) {
Log.e(TAG, t.toString());
}
});
}
}
最佳答案
您应该更改扩展布局的方式。这应该可以解决问题。
public class DataAdapter extends RecyclerView.Adapter<DataAdapter.DataViewHolder> {
private List<Feature> features;
public DataAdapter(List<Feature> features) {
this.features = features;
}
@Override
public DataAdapter.DataViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.single_data_layout, parent, false);
return new DataViewHolder(view);
}
@Override
public void onBindViewHolder(DataViewHolder holder, int position) {
holder.place.setText(features.get(position).getProperties().getPlace());
holder.alert.setText(features.get(position).getProperties().getAlert());
}
@Override
public int getItemCount() {
return features.size();
}
public static class DataViewHolder extends RecyclerView.ViewHolder {
private final TextView place;
private final TextView alert;
public DataViewHolder(View view) {
super(view);
place = (TextView) view.findViewById(R.id.place_text_view);
alert = (TextView) view.findViewById(R.id.alert_text_view);
}
}
}
关于java - RecyclerView 未附加到 Adapter,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42716889/