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本節說明如何準備車輛以執行排定的工作。您必須完成下列每個步驟,後端才能將車輛與工作配對。
設定接聽程式
由於 Driver SDK 會在背景執行動作,因此請在發生特定事件 (例如錯誤、警告或偵錯訊息) 時,使用 DriverStatusListener
觸發通知。錯誤可能是暫時性 (例如 BACKEND_CONNECTIVITY_ERROR
),也可能導致位置資訊更新永久停止。舉例來說,如果收到 VEHICLE_NOT_FOUND
錯誤,表示設定有誤。
以下範例顯示 DriverStatusListener
實作方式:
class MyStatusListener implements DriverStatusListener {
/** Called when background status is updated, during actions such as location reporting. */
@Override
public void updateStatus(
StatusLevel statusLevel, StatusCode statusCode, String statusMsg, @Nullable Throwable cause) {
// Existing implementation
if (cause != null && cause instanceof StatusRuntimeException) {
if (Status.NOT_FOUND.getCode().equals(cause.getStatus().getCode())) {
// NOT_FOUND gRPC exception thrown by Fleet Engine.
}
}
}
}
DriverContextBuilder.setDriverStatusListener(new MyStatusListener());
啟用位置資訊更新
取得 *VehicleReporter
執行個體後,請按照下列步驟啟用位置資訊更新:
Java
DeliveryVehicleReporter reporter = ...;
reporter.enableLocationTracking();
Kotlin
val reporter = ...
reporter.enableLocationTracking()
(選用) 設定更新間隔
根據預設,Driver SDK 會每隔 10 秒傳送一次位置更新。每次更新位置資訊也代表車輛已連上網路。如要變更間隔,請使用 reporter.setLocationReportingInterval(long, TimeUnit)
。支援的更新間隔最短為 5 秒。更頻繁的更新可能會導致要求速度變慢和發生錯誤。
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上次更新時間:2025-08-31 (世界標準時間)。
[null,null,["上次更新時間:2025-08-31 (世界標準時間)。"],[[["\u003cp\u003eBefore tasks can be assigned, vehicles must be prepared by completing setup steps that enable communication with the backend system.\u003c/p\u003e\n"],["\u003cp\u003eA \u003ccode\u003eDriverStatusListener\u003c/code\u003e is implemented to receive notifications regarding the vehicle's status, including errors, warnings, and debug messages.\u003c/p\u003e\n"],["\u003cp\u003eLocation updates are enabled using the \u003ccode\u003eenableLocationTracking()\u003c/code\u003e method of a \u003ccode\u003e*VehicleReporter\u003c/code\u003e instance, ensuring the backend knows the vehicle's position.\u003c/p\u003e\n"],["\u003cp\u003eOptionally, the frequency of location updates can be customized, but it's recommended to keep it at the default 10-second interval or above to avoid performance issues.\u003c/p\u003e\n"]]],[],null,["# Get the vehicle ready\n\nThis section shows how to get the vehicle ready for scheduled tasks. You must\ncomplete each of the following steps before your backend can match a vehicle to\na task.\n\nSet up listener\n---------------\n\nSince the Driver SDK performs actions in the\nbackground, use the `DriverStatusListener` to trigger notifications when certain\nevents occur, such as errors, warnings, or debug messages. Errors can be\ntransient in nature (such as `BACKEND_CONNECTIVITY_ERROR`), or they might\ncause location updates to stop permanently. For example, if you receive a\n`VEHICLE_NOT_FOUND` error, it indicates a configuration error.\n\nThe following example shows a `DriverStatusListener` implementation: \n\n class MyStatusListener implements DriverStatusListener {\n /** Called when background status is updated, during actions such as location reporting. */\n @Override\n public void updateStatus(\n StatusLevel statusLevel, StatusCode statusCode, String statusMsg, @Nullable Throwable cause) {\n // Existing implementation\n\n if (cause != null && cause instanceof StatusRuntimeException) {\n if (Status.NOT_FOUND.getCode().equals(cause.getStatus().getCode())) {\n // NOT_FOUND gRPC exception thrown by Fleet Engine.\n }\n }\n }\n }\n\n DriverContextBuilder.setDriverStatusListener(new MyStatusListener());\n\nEnable location updates\n-----------------------\n\nOnce you have a `*VehicleReporter` instance, enable location updates as follows: \n\n### Java\n\n DeliveryVehicleReporter reporter = ...;\n\n reporter.enableLocationTracking();\n\n### Kotlin\n\n val reporter = ...\n\n reporter.enableLocationTracking()\n\n### (Optional) Set the update interval\n\nBy default, the Driver SDK sends location updates at 10-second intervals. Each\nlocation update also indicates that the vehicle is online. You can change this\ninterval with\n`reporter.setLocationReportingInterval(long, TimeUnit)`. The minimum supported\nupdate interval is 5 seconds. More frequent updates may result in slower\nrequests and errors."]]