设置监听器
初始化驱动程序 SDK 并创建 GMTDDeliveryDriverAPI
实例后,您可以设置事件监听器来监控发送到 Fleet Engine 和后端的车辆更新是成功还是失败。这些监听器可以触发驱动程序应用中的操作,例如在与后端通信失败时通知驱动程序。
监听车辆更新事件
当驾驶员在驾驶员应用中启用位置信息更新时,驱动程序 SDK 会通过 GMTDDeliveryVehicleReporter
类向 Fleet Engine 和客户后端发送常规车辆更新。您可以通过设置 GMTDVehicleReporterListener
协议让应用响应更新事件。
借助 GMTDVehicleReporterListener
,您可以处理以下事件:
vehicleReporter:didSucceedVehicleUpdate
告知 Driver 应用后端服务已成功接收车辆位置和状态更新。
vehicleReporter:didFailVehicleUpdate:withError
通知监听器车辆更新失败。只要驱动程序启用了位置信息更新,
GMTDDeliveryVehicleReporter
类就会继续将最新数据发送到 Fleet Engine。
以下示例展示了如何设置 GMTDVehicleReporterListener
来处理这些事件:
Swift
import GoogleRidesharingDriver
private let providerID = "INSERT_YOUR_PROVIDER_ID"
class SampleViewController: UIViewController, GMTDVehicleReporterListener {
private let mapView: GMSMapView
override func viewDidLoad() {
// Assumes you have implemented the sample code up to this step.
deliveryDriverAPI.vehicleReporter.add(self)
}
func vehicleReporter(_ vehicleReporter: GMTDDeliveryVehicleReporter, didSucceed vehicleUpdate: GMTDVehicleUpdate) {
// Handle update succeeded.
}
func vehicleReporter(_ vehicleReporter: GMTDDeliveryVehicleReporter, didFail vehicleUpdate: GMTDVehicleUpdate, withError error: Error) {
// Handle update failed.
}
}
Objective-C
SampleViewController.h
@interface SampleViewController : UIViewController<GMTDVehicleReporterListener>
@end
SampleViewController.m
#import "SampleViewController.h"
#import "SampleAccessTokenProvider.h"
#import <GoogleRidesharingDriver/GoogleRidesharingDriver.h>
static NSString *const PROVIDER_ID = @"INSERT_YOUR_PROVIDER_ID";
@implementation SampleViewController {
GMSMapView *_mapView;
}
- (void)viewDidLoad {
// ASSUMES YOU IMPLEMENTED HAVE THE SAMPLE CODE UP TO THIS STEP.
[delivervehicleReporter addListener:self];
}
- (void)vehicleReporter:(GMTDDeliveryVehicleReporter *)vehicleReporter didSucceedVehicleUpdate:(GMTDVehicleUpdate *)vehicleUpdate {
// Handle update succeeded.
}
- (void)vehicleReporter:(GMTDDeliveryVehicleReporter *)vehicleReporter didFailVehicleUpdate:(GMTDVehicleUpdate *)vehicleUpdate withError:(NSError *)error {
// Handle update failed.
}
@end
启用位置信息更新
如需启用位置信息更新,请在驾驶应用中的 GMTDDeliveryVehicleReporter
上,将 locationTrackingEnabled
设置为 YES
。然后,GMTDDeliveryVehicleReporter
类会自动将位置信息更新发送到 Fleet Engine。此外,当 GMSNavigator
处于导航模式(即通过 setDestinations
设置目的地)时,GMTDDeliveryVehicleReporter
类会自动发送路线和预计到达时间更新。
驱动程序 SDK 会设置与驾驶员的当前导航路径匹配的路线。为了确保准确的位置信息更新,请在 -setDestinations:callback:
中设置航点,使其与 Fleet Engine 中的目的地相匹配。
以下示例展示了如何启用位置信息更新:
Swift
import GoogleRidesharingDriver
private let providerID = "INSERT_YOUR_PROVIDER_ID"
class SampleViewController: UIViewController, GMTDVehicleReporterListener {
private let mapView: GMSMapView
override func viewDidLoad() {
// Assumes you have implemented the sample code up to this step.
deliveryDriverAPI.vehicleReporter.locationTrackingEnabled = true
}
}
Objective-C
SampleViewController.m
#import "SampleViewController.h"
#import "SampleAccessTokenProvider.h"
#import <GoogleRidesharingDriver/GoogleRidesharingDriver.h>
static NSString *const PROVIDER_ID = @"INSERT_YOUR_PROVIDER_ID";
@implementation SampleViewController {
GMSMapView *_mapView;
}
- (void)viewDidLoad {
// ASSUMES YOU HAVE IMPLEMENTED THE SAMPLE CODE UP TO THIS STEP.
deliveryDriverAPI.vehicleReporter.locationTrackingEnabled = YES;
}
@end
(可选)设置更新间隔
默认情况下,当您将 locationTrackingEnabled
设置为 YES
时,驱动程序 SDK 会以 10 秒的时间间隔向 Fleet Engine 发送位置信息更新。您可以使用 locationUpdateInterval
将更新间隔时间更改为最短 5 秒或最长 60 秒。提高更新频率可能会导致请求速度变慢和出现错误。