程序包 ohos.distributedschedule.interwork

接口 IDeviceStateCallback

public interface IDeviceStateCallback

Provides callbacks that can be invoked when the state of a device on the distributed network changes to online or offline.

Before calling DeviceManager#registerDeviceStateCallback(IDeviceStateCallback) to register device state callbacks, you must first create a class to implement this interface and override the IDeviceStateCallback#onDeviceOffline(String, int) and IDeviceStateCallback#onDeviceOnline(String, int) methods. After device state callbacks are registered, IDeviceStateCallback#onDeviceOnline(String, int) will be called when a device on the distributed network is online; IDeviceStateCallback#onDeviceOffline(String, int) will be called when a device goes offline; and your application will be notified of the network ID and device type of the device that goes online or offline. If your application no longer needs to receive these notifications, you can call DeviceManager#unregisterDeviceStateCallback(IDeviceStateCallback) to unregister all previously registered callbacks.

从以下版本开始:

3

另请参阅:

DeviceManager.registerDeviceStateCallback(IDeviceStateCallback), DeviceManager.unregisterDeviceStateCallback(IDeviceStateCallback)

方法概要

限定符和类型	方法	说明
void	onDeviceOffline(String deviceId, int deviceType)	Called when a device goes offline.
void	onDeviceOnline(String deviceId, int deviceType)	Called when a device goes online.

方法详细资料

onDeviceOffline

void onDeviceOffline(String deviceId,
                     int deviceType)

Called when a device goes offline.

If your application needs to be notified when a device goes offline, you should implement the IDeviceStateCallback interface, override this callback, and then call DeviceManager#registerDeviceStateCallback(IDeviceStateCallback)

onDeviceOnline

void onDeviceOnline(String deviceId,
                    int deviceType)

Called when a device goes online.

If your application needs to be notified when a device goes online, you should implement the IDeviceStateCallback interface, override this callback, and then call DeviceManager#registerDeviceStateCallback(IDeviceStateCallback)