Google Places API。 PlaceLikelihoodBuffer响应缓慢。 Android的

Question

我正在使用PlaceLikelihoodBuffer buffer = result.await(); （在AsyncTask ），以获取当前我最可能位于的位置。

该代码可以正常工作，但是响应速度非常慢， 尤其是在我第一次打开应用程序并运行search / method时 。

第一次通常需要3秒钟才能得到回应。 所以我的问题是这是否正常？ 还是应该更快？ 在那种情况下，我迟钝的可能原因是什么。 （ GoogleApiClient连接非常快。当连接PlaceDetection将运行APIclient 。）

码：

这是Api Client ：

   mGoogleApiClient = new GoogleApiClient.Builder(activity)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)                  
            .addApi(Places.PLACE_DETECTION_API)
            .addApi(Places.GEO_DATA_API)
            .build();

    mGoogleApiClient.blockingConnect();

这是获取Placelikelyhood ：

PendingResult<PlaceLikelihoodBuffer> result = Places.PlaceDetectionApi.getCurrentPlace(mGoogleApiClient, null);
PlaceLikelihoodBuffer buffer = result.await();

Answer 1

您正在使用mGoogleApiClient.blockingConnect() ，它必须在后台线程中运行，并且您正在使用PendingResult.await() ，它也必须在后台线程中运行。

似乎使用后台线程的额外开销可能是造成额外延迟的原因。

请注意，另一个原因可能是数据连接的速度。

而且，返回结果需要多长时间的另一个原因是，基于当前位置，结果中有多少个项目。

我只是使用回调函数而不使用后台线程对其进行了测试，并使用不同的数据连接类型测试了首次启动行为（我确保在启动之前也从任务列表中将其杀死）。

我用connect()代替blockingConnect() ：

mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(Places.PLACE_DETECTION_API)
            .addApi(Places.GEO_DATA_API)
            .build();

    //mGoogleApiClient.blockingConnect();
    mGoogleApiClient.connect();

然后在onConnected()我使用了标准回调，而不是PendingResult.await() ：

@Override
public void onConnected(Bundle bundle) {

    Log.i(TAG, "mGoogleApiClient connected");

    PendingResult<PlaceLikelihoodBuffer> result = Places.PlaceDetectionApi
            .getCurrentPlace(mGoogleApiClient, null);
    result.setResultCallback(new ResultCallback<PlaceLikelihoodBuffer>() {
        @Override
        public void onResult(PlaceLikelihoodBuffer likelyPlaces) {
            for (PlaceLikelihood placeLikelihood : likelyPlaces) {
                Log.i(TAG, String.format("Place '%s' has likelihood: %g",
                        placeLikelihood.getPlace().getName(),
                        placeLikelihood.getLikelihood()));
            }
            likelyPlaces.release();
        }
    });
}

第一次测试，已连接到我的2.5 GHz WiFi连接。 在日志中，你可以看到它在提出的要求26:11.239 ，结果在来到26:12.920 ，这是1.681秒一个区别：

06-25 00:26:11.239  20257-20257/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ mGoogleApiClient connected
06-25 00:26:12.920  20257-20257/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Tocher Services Inc' has likelihood: 0.250000
//........

在下一个测试中，我连接到5 GHz WiFi连接，并在1.521秒后返回：

06-25 00:51:24.385  24193-24193/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ mGoogleApiClient connected
06-25 00:51:25.906  24193-24193/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Tocher Services Inc' has likelihood: 0.250000

下次测试，从WiFi断开，已连接到LTE。

毫不奇怪，这花了更长的时间：2.642秒。

但是，令人惊讶的是，与连接到WiFi相比，返回的结果要多得多（以前的结果每次都返回4个结果，在以前的日志中未显示，在此列出完整的列表）：

06-25 00:57:45.767  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ mGoogleApiClient connected
06-25 00:57:48.409  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Navlet's Garden Center' has likelihood: 0.250000
06-25 00:57:48.409  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Safeway' has likelihood: 0.0900000
06-25 00:57:48.419  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Caffino' has likelihood: 0.0800000
06-25 00:57:48.419  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'CVS Pharmacy' has likelihood: 0.0700000
06-25 00:57:48.419  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Devon Apartments' has likelihood: 0.0600000
06-25 00:57:48.419  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Strawberry Fields DJ Co' has likelihood: 0.0500000
06-25 00:57:48.419  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Yanni's Greek Cafe' has likelihood: 0.0400000
06-25 00:57:48.419  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Mother India' has likelihood: 0.0300000
06-25 00:57:48.419  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Valero' has likelihood: 0.0200000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place '76' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'The UPS Store' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Chateau Pleasant Hill' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Carland' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Chateau Pleasant Hill' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'El Mariachi Mexican Grill' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Alhambra Hills Realty' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Starbucks' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Stepping Stones Learning Center' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Intercontinental Services' has likelihood: 0.0100000
06-25 00:57:48.429  26062-26062/com.currentplace.daniel.currentplace I/CurrentPlaceTest﹕ Place 'Fitness Evolution' has likelihood: 0.0100000