Question

我们已经开发了ola和uber等交付应用程序。骑手可以下订单并交付给客户的地方。我们已经初始化位置变量，从而创建了一个android服务（Background Service）。我们通过3种方法（网络提供商，Gps提供商，Google融合的位置api）获取位置。我们曾经使用过这三个方法来获取位置，当我们获得一个位置时，它将存储到我们的成员变量中（以后在辅助项目中使用），并且针对该附加程序将相同的位置保存到我们的服务器中。我们专门面对2或3个问题。 1，有时用户位置正确，在20-30秒内我们得到了错误的位置，准确度为> 50或100。 2.某些时间位置停留了几分钟或长时间。

我们正在使用Google规定的专门定位策略。下面是示例。

private static final int TWO_MINUTES = 1000 * 60 * 2;

/** Determines whether one Location reading is better than the current Location fix
 * @param location  The new Location that you want to evaluate
 * @param currentBestLocation  The current Location fix, to which you want to compare the new one
 */
protected boolean isBetterLocation(Location location, Location currentBestLocation) {
    if (currentBestLocation == null) {
        // A new location is always better than no location
        return true;
    }

    // Check whether the new location fix is newer or older
    long timeDelta = location.getTime() - currentBestLocation.getTime();
    boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
    boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
    boolean isNewer = timeDelta > 0;

    // If it's been more than two minutes since the current location, use the new location
    // because the user has likely moved
    if (isSignificantlyNewer) {
        return true;
        // If the new location is more than two minutes older, it must be worse
    } else if (isSignificantlyOlder) {
        return false;
    }

    // Check whether the new location fix is more or less accurate
    int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
    boolean isLessAccurate = accuracyDelta > 0;
    boolean isMoreAccurate = accuracyDelta < 0;
    boolean isSignificantlyLessAccurate = accuracyDelta > 200;

    // Check if the old and new location are from the same provider
    boolean isFromSameProvider = isSameProvider(location.getProvider(),
            currentBestLocation.getProvider());

    // Determine location quality using a combination of timeliness and accuracy
    if (isMoreAccurate) {
        return true;
    } else if (isNewer && !isLessAccurate) {
        return true;
    } else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
        return true;
    }
    return false;
}

/** Checks whether two providers are the same */
private boolean isSameProvider(String provider1, String provider2) {
    if (provider1 == null) {
        return provider2 == null;
    }
    return provider1.equals(provider2);
}


if (isMoreAccurate)
{
    return true;
}
else if (isNewer && !isLessAccurate) 
{
    return true;
}
else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) 
{
    return true;
}

return false;

我不知道下一步该怎么做。

我已经集成了Network Provide，GPS提供商和融合位置提供商。我正在获取位置，但准确性较低。我还维护了最近10个连续位置的列表。当我收到第11个位置时，我搜索了列表，如果发现所有位置都相同（这意味着位置卡住了），那么我清除了列表，并通过停止并使用新连接重新启动服务来断开位置连接。

Answer 1

Android有restrictions用于从后台服务获取位置更新。您要么必须从前台活动中获取位置，要么将服务更改为具有固定通知的前台服务，以获取定期的位置更新。

位置准确性问题也可能是由于用户未在设备中设置高精度位置模式。这将检查用户设备中是否启用了位置。如果启用了位置但未启用高精度，将显示对话框。

private static final int REQUEST_CHECK_SETTINGS = 001;

private void displayLocationSettingsRequest(Context context) {
        GoogleApiClient googleApiClient = new GoogleApiClient.Builder(context)
                .addApi(LocationServices.API).build();
        googleApiClient.connect();

        LocationRequest locationRequest = LocationRequest.create();
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        locationRequest.setInterval(10000);
        locationRequest.setFastestInterval(10000 / 2);

        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder().addLocationRequest(locationRequest);
        builder.setAlwaysShow(true);

        PendingResult<LocationSettingsResult> result = LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
        result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
            @Override
            public void onResult(LocationSettingsResult result) {
                final Status status = result.getStatus();
                switch (status.getStatusCode()) {
                    case LocationSettingsStatusCodes.SUCCESS:
                        //Location settings satisfied
                        break;
                    case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                        //Location settings are not satisfied. Show the user a dialog to upgrade location settings
                        try {
                            status.startResolutionForResult(Activity.this, REQUEST_CHECK_SETTINGS);
                        } catch (IntentSender.SendIntentException e) {
                            LogUtil.i("PendingIntent unable to execute request.");
                        }
                        break;
                    case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                        //Location settings are inadequate, and cannot be fixed here. Dialog not created.
                        Toast.makeText(Activity.this, "Error enabling location. Please try again", Toast.LENGTH_SHORT).show();
                        break;
                }
            }
        });
    }

无法在Android设备上获取准确的位置

1 个答案: