程序包 ohos.distributedhardware.devicemanager

接口 DeviceStateCallback

public interface DeviceStateCallback

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

Before calling DeviceManager#registerDeviceStateCallback(String, Map, DeviceStateCallback) to register device state callbacks, you must first create a class to implement this interface and override the DeviceStateCallback#onDeviceOffline(DeviceInfo) and DeviceStateCallback#onDeviceOnline(DeviceInfo) methods.

• When a monitored device goes online, DeviceStateCallback#onDeviceOnline(DeviceInfo) will be called to notify your application of the online device information.
• When a monitored device goes offline, DeviceStateCallback#onDeviceOffline(DeviceInfo) will be called to notify your application of the offline device information.
• If your application no longer needs to receive these notifications, you can call DeviceManager#unregisterDeviceStateCallback(String, DeviceStateCallback) to unregister all previously registered callbacks.

从以下版本开始:

4

另请参阅:

DeviceManager.registerDeviceStateCallback(String, Map, DeviceStateCallback), DeviceManager.unregisterDeviceStateCallback(String, DeviceStateCallback)

方法概要

限定符和类型	方法	说明
void	onDeviceOffline(DeviceInfo deviceInfo)	Called when a device being monitored goes offline.
void	onDeviceOnline(DeviceInfo deviceInfo)	Called when a device being monitored goes online.

方法详细资料

onDeviceOffline

void onDeviceOffline(DeviceInfo deviceInfo)

Called when a device being monitored goes offline.

If your application needs to be notified when a device goes offline, you must implement the DeviceStateCallback interface, override this callback, and then call DeviceManager#registerDeviceStateCallback(String, Map, DeviceStateCallback) to register the callback object. After being registered, this callback will be invoked when a device goes offline and your application will be notified of the offline device information.

参数:

deviceInfo - Indicates the offline device information. For details, see DeviceInfo.

从以下版本开始:

4

onDeviceOnline

void onDeviceOnline(DeviceInfo deviceInfo)

Called when a device being monitored goes online.

If your application needs to be notified when a device goes online, you must implement the DeviceStateCallback interface, override this callback, and then call DeviceManager#registerDeviceStateCallback(String, Map, DeviceStateCallback) to register the callback object. After being registered, this callback will be invoked when a device goes online and your application will be notified of the online device information.

参数:

deviceInfo - Indicates the online device information. For details, see DeviceInfo.

从以下版本开始:

4