设置监听器
初始化 Driver SDK 并创建 GMTDDeliveryDriverAPI
实例后,您可以设置事件监听器,以监控发送到车队引擎和后端的车辆更新是否成功。这些监听器可以在您的驾驶员应用中触发操作,例如在与后端通信失败时通知驾驶员。
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,Driver SDK 会通过 GMTDDeliveryVehicleReporter
类将常规车辆更新发送到 Fleet Engine 和客户后端。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
告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
类就会继续向车队引擎发送最新数据。
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 GMTDDeliveryVehicleReporter
上的驾驶员应用中将 locationTrackingEnabled
设置为 YES
。然后,GMTDDeliveryVehicleReporter
类会自动将位置信息更新发送到车队引擎。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。
Driver SDK 会设置路线,使其与驾驶员的当前导航路径相匹配。为确保位置信息更新准确无误,请在 -setDestinations:callback:
中将航点设置为与车队引擎中的目的地一致。
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,Driver SDK 会以 10 秒的间隔向 Fleet Engine 发送位置更新。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。