public static AutocompleteSessionToken newInstance () return 是同一个实例吗？

Question

这个方法是否适用于单例模式？还是每次都为用户创建新会话？

在 edittext 更改侦听器上调用以下方法。

   @NonNull
   private ArrayList<PlaceAutocomplete> getPredictions(@NonNull CharSequence constraint) {

       final ArrayList<PlaceAutocomplete> resultList = new ArrayList<>();

       // Create a new token for the autocomplete session. Pass this to FindAutocompletePredictionsRequest,
       // and once again when the user makes a selection (for example when calling fetchPlace()).
       AutocompleteSessionToken token = AutocompleteSessionToken.newInstance();

       //https://gist.github.com/graydon/11198540
       // Use the builder to create a FindAutocompletePredictionsRequest.
       FindAutocompletePredictionsRequest request = FindAutocompletePredictionsRequest.builder()
              .setLocationBias(bounds)
               .setCountry("PK")
               .setSessionToken(token)
               .setQuery(constraint.toString())
               .build();

       Task<FindAutocompletePredictionsResponse> autocompletePredictions = placesClient.findAutocompletePredictions(request);

       // This method should have been called off the main UI thread. Block and wait for at most
       // 60s for a result from the API.
       try {
           Tasks.await(autocompletePredictions, 60, TimeUnit.SECONDS);
       } catch (@NonNull ExecutionException | InterruptedException | TimeoutException e) {
           e.printStackTrace();
       }

       if (autocompletePredictions.isSuccessful()) {
           FindAutocompletePredictionsResponse findAutocompletePredictionsResponse = autocompletePredictions.getResult();
           if (findAutocompletePredictionsResponse != null)
               for (AutocompletePrediction prediction : findAutocompletePredictionsResponse.getAutocompletePredictions()) {
                   Log.i(TAG, prediction.getPlaceId());
                   resultList.add(new PlaceAutocomplete(prediction.getPlaceId(), prediction.getPrimaryText(STYLE_NORMAL).toString(), prediction.getFullText(STYLE_BOLD).toString()));
               }

           return resultList;
       } else {
           return resultList;
       }

   }

该方法调用 editText 中的每个文本更改。

Answer 1

AutocompleteSessionToken.newInstance()方法returns一个新的实例，即一个新的会话令牌。每次调用此方法时，您都是 creating 一个新的会话令牌。

Google 解释了自动完成会话的工作原理 here：

Session tokens group the query and selection phases of a user autocomplete search into a discrete session for billing purposes. The session begins when the user starts typing a query, and concludes when they select a place. Each session can have multiple queries, followed by one place selection. Once a session has concluded, the token is no longer valid; your app must generate a fresh token for each session.

当用户从自动完成预测中选择一个地点时，editText 中的文本会发生变化（会话结束，当用户选择一个新地点时将创建一个新文本）。

希望对您有所帮助！

public static AutocompleteSessionToken newInstance () return 是同一个实例吗？

Does public static AutocompleteSessionToken newInstance () return same instance?

java

android

google-maps

google-places-api

googleplacesautocomplete