Android 单击按钮时回收站视图未更新

Question

我有这个片段，我在其中编辑文本、一个按钮和一个回收站视图。当我第一次单击该按钮时，它具有预期的行为，但如果我更改编辑文本内容并再次单击该按钮，它不会更新我的回收站视图。我究竟做错了什么？因为我在重复这个过程每次点击 Api 调用

片段

public class SearchFragment extends Fragment implements View.OnClickListener {

    private RestaurantAdapter mAdapter;
    private RecyclerView mRecyclerView;
    protected static List<Restaurant_> restaurantsList;
    private Context context;
    private static OnRestaurantClickedListener listener;
    private FirebaseAuth mAuth;

    private EditText keyword;

    private FusedLocationProviderClient mFusedLocationClient;


    public SearchFragment() {
    }

    public static OnRestaurantClickedListener getListener() {
        return listener;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        context = getContext();
        mAuth = FirebaseAuth.getInstance();
        restaurantsList = new ArrayList<>();
        mAdapter = new RestaurantAdapter(context, restaurantsList, getActivity());
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View mContentView = inflater.inflate(R.layout.fragment_search, container, false);
        mRecyclerView = mContentView.findViewById(R.id.recycler_view);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(mContentView.getContext()));
        mRecyclerView.setAdapter(mAdapter);

        keyword = mContentView.findViewById(R.id.keyword);
        keyword.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int actionId, KeyEvent keyEvent) {
                if ((keyEvent != null && keyEvent.getKeyCode() == KeyEvent.KEYCODE_ENTER) || (actionId == EditorInfo.IME_ACTION_SEARCH))
                    getRestaurants();
                return false;
            }
        });

        ImageButton searchButton = mContentView.findViewById(R.id.search);
        searchButton.setOnClickListener(this);

        return mContentView;
    }

    @Override
    public void onResume() {
        super.onResume();
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            listener = (OnRestaurantClickedListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement OnButtonClicked");
        }
    }

    @SuppressLint("MissingPermission")
    private void getRestaurants() {
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(getActivity());
        mFusedLocationClient.getLastLocation().addOnSuccessListener(getActivity(), new OnSuccessListener<Location>() {
            @Override
            public void onSuccess(final Location location) {
                if (location != null) {
                    SharedPreferences mSettings = PreferenceManager.getDefaultSharedPreferences(context);
                    String sort = mSettings.getString("sort", "rating");
                    String order = mSettings.getString("order", "desc");
                    double radius = Double.parseDouble(mSettings.getString("radius", "10"));
                    radius = radius * 1000;
                    RetrofitZomato.getApi().searchByName(keyword.getText().toString(), location.getLatitude(), location.getLongitude(),
                            20, radius, sort, order, getActivity().getResources().getString(R.string.user_key))
                            .enqueue(new Callback<SearchResponse>() {
                                @Override
                                public void onResponse(Call<SearchResponse> call, Response<SearchResponse> response) {
                                    if (restaurantsList.size() != 0) {
                                        restaurantsList.clear();
                                        mAdapter.notifyDataSetChanged();
                                    }
                                    List<Restaurant> restaurants = response.body().getRestaurants();
                                    for (int i = 0; i < restaurants.size(); i++) {
                                        double distance = calculateDistance(Double.parseDouble(restaurants.get(i).getRestaurant().getLocation().getLatitude()),
                                                Double.parseDouble(restaurants.get(i).getRestaurant().getLocation().getLongitude()),
                                                location.getLatitude(), location.getLongitude());
                                        distance = (double) Math.round(distance * 100d) / 100d;
                                        restaurants.get(i).getRestaurant().setDistance(distance);
                                        restaurantsList.add(restaurants.get(i).getRestaurant());
                                        mAdapter.notifyItemInserted(i);
                                    }
                                }

                                @Override
                                public void onFailure(Call<SearchResponse> call, Throwable t) {
                                    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                                    builder.setMessage("Couldn't find any nearby restaurants");
                                    AlertDialog mDialog = builder.create();
                                    mDialog.show();
                                }
                            });
                }
            }
        }).addOnFailureListener(getActivity(), new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Toast.makeText(getActivity(), "It wasn't possible to determine your location", Toast.LENGTH_LONG).show();
            }
        });
    }

    private double calculateDistance(double latRestaurant, double lonRestaurant, double myLat, double myLon) {
        if ((myLat == latRestaurant) && (myLon == lonRestaurant)) {
            return 0;
        } else {
            double theta = myLon - lonRestaurant;
            double dist = Math.sin(Math.toRadians(myLat)) * Math.sin(Math.toRadians(latRestaurant))
                    + Math.cos(Math.toRadians(myLat)) * Math.cos(Math.toRadians(latRestaurant)) * Math.cos(Math.toRadians(theta));
            dist = Math.acos(dist);
            dist = Math.toDegrees(dist);
            dist = dist * 60 * 1.1515;
            dist = dist * 1.609344;
            return dist;
        }
    }

    @Override
    public void onClick(View view) {
        int id = view.getId();
        if (id == R.id.search) {
            getRestaurants();
        }
    }
//    @Override
//    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
//        super.onActivityCreated(savedInstanceState);
//        searchViewModel = ViewModelProviders.of(this).get(SearchViewModel.class);
//        // TODO: Use the ViewModel
//    }

}

Answer 1

请注意，对于每个 getRestaurants 调用，您都在调用 getFusedLocationProviderClient 和 addOnSuccessListener，保持旧的注册和离开...也许这些多个侦听器实例是此行为的原因？

将此行移至 onAttach

mFusedLocationClient = LocationServices.getFusedLocationProviderClient(getActivity());

因为被调用一次。然后让你的 SearchFragment 实现 OnSuccessListener 并设置为 FusedLocationProviderClient。您的点击应该触发对新位置的请求，您当前使用 getLastLocation 的代码也可能在 onAttach

中处理

编辑：真实答案-评论复制

尝试删除 mAdapter.notifyItemInserted(i); 行并将 mAdapter.notifyDataSetChanged(); 移出方法结束时的 if 条件（在 for 循环之后）。我在您的代码中没有发现任何可疑之处，看起来不错...

Android 单击按钮时回收站视图未更新

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片段